Bosch Automotive Service Solutions KT720 Automotive Diagnostics Equipment User Manual KT720 EN part 2

Bosch Automotive Service Solutions (Suzhou) Co., Ltd Shenzhen Branch Automotive Diagnostics Equipment KT720 EN part 2

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KT720 EN User Manual -part 2

1 697 021 785 | 2015-05-20 Bosch Automotive Products (Nanjing) Co., Ltd

32 | KT720 | Measure functionen

11.6.3.1 Equipment connection

When connecting KT720 to power extension cable for

power supply, choose power supply according to the

battery position of vehicle mode tested. All connec-

ting diagrams in this users manual take power supply

by battery clip power cable as example. Connect BNC

end of 2KT720 oscilloscope probes to CH1 and CH2,

then connect the other end of the both black banana

plugs and 2 alligator clips to negative pole of battery

or grounding, and connect the other end of red banana

plugs and 2 banana sockets into the trigger signal line.

Fig. 13: Equipment connection

11.6.3.2 Measure conditions

RStart engine to heat oxygen sensor to over 315˚C,

with engine in closed-loop state.

RIncrease engine speed from idle.

11.6.3.3 Measure steps

1. Connect equipment according to Fig.13, switch on

power supply.

2. Start engine to heat oxygen sensor to over 315˚C,

with engine in closed-loop state.

3. Double click run KT720 software.

4. Select communication mode: USB communication or

wireless communication, the KT720 and the compu-

ter are successfully communicated.

5. Click Analyzer --> Sensor --> Dual Oxygen Sensor;

6. Waveform will be displayed on the screen depending

on measure conditions.

7. You can adjust to cycle, amplitude, coupling,

reversed-phase, and cursor. If the cycle locates at

high-frequency section, the triggering channel and

triggering modes can be adjusted.

8. You can print measured data, load snapshot data

and reference waveform data, save current confi-

guration or acquire old configuration, automatically

adjust the amplitude, snapshot current waveform

and waveform comparison;

9. You can check the details of current waveform by cli-

cking “Pause” button. After click, the button turns to

“Start”, click it again to carry forward measurement.

10. You can record a continuous waveform section by

clicking “Record” button.

11.6.3.4 Waveform analysis

When testing waveform of double oxygen sensor, we

can judge, through the waveform of front and rear oxy-

gen sensors, whether the ability of three-way catalyst

device to convert deleterious gas is lost. Generally

speaking, the bigger the amplitude value of two wave-

forms is, it indicates that three-way catalyst device

has perfect function; if amplitude value is basically

the same, it indicates that it has lost its function. See

Fig.14 for schematic diagram.

Fig. 14: Catalytic convert

11.6.4 Temperature sensor

They are mainly water temperature sensor and air

intake temperature sensor, and most temperature

sensors adopt negative temperature coefficient (NTC)

thermistor made of semi-conducting materials. When

temperature changes, its resistance is expected to

experience a large change. When temperature rises,

resistance decreases; when temperature decreases,

resistance increases.

11.6.4.1 Equipment connection

When connecting KT720 to power extension cable for

power supply, choose power supply according to the

battery position of vehicle mode tested. All connecting

diagrams in this users manual take power supply by

battery clip power cable as example. Connect BNC end

ofKT720 oscilloscope probe to CH1, then connect the

other end of the black banana plug and black alligator

clip to negative pole of battery or grounding, and con-

nect the other end of red banana plug and red banana

socket into the trigger signal line.

Fig. 15: Equipment connection

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Measure function | KT720 | 33 en

11.6.4.2 Measure conditions

RSwitch on ignition switch, do not start engine. Secu-

rely connect temperature sensor, and measure the

output voltage of temperature sensor with engine in

non-running state.

RStart engine, observe voltage falling of temperature

sensor when engine gets heated.

RYou may also disconnect sensor and use multimeter

to measure resistance value.

11.6.4.3 Measure steps

1. Connect equipment according to Fig.15, switch on

power supply.

2. Double click run KT720 software.

3. Select communication mode: USB communication or

wireless communication, the KT720 and the compu-

ter are successfully communicated.

4. Click Analyzer --> Sensor --> Temperature Sensor.

5. Waveform will be displayed on the screen depending

on measure conditions.

6. You can adjust to cycle, amplitude, coupling,

reversed-phase, and cursor. If the cycle locates at

high-frequency section, the triggering channel and

triggering modes can be adjusted.

7. You can print measured data, load snapshot data

and reference waveform data, save current confi-

guration or acquire old configuration, automatically

adjust the amplitude, snapshot current waveform

and waveform comparison;

8. You can check the details of current waveform by cli-

cking “Pause” button. After click, the button turns to

“Start”, click it again to carry forward measurement.

9. You can record a continuous waveform section by

clicking “Record” button.

11.6.4.4 Waveform analysis

You can get precise voltage range of sensor response

by referring to standard manual from manufacturer. Ge-

nerally, the voltage of sensor should be 3~5V (fully cold

state) when engine is not started, and it should have

correspondingly variable output voltage signal under

different temperature conditions. When temperature

sensor circuit is open, voltage increases till it reaches

the peak (5V) of reference voltage; when temperature

sensor is short to ground, voltage decreases till it

reaches the peak of grounding voltage. As shown Fig.16

for temperature characteristics of common thermistor

type coolant and air intake temperature sensor, subject

to manufacturer’s manual.

Fig. 16: Temperature characteristics

11.6.5 Throttle position sensor

Throttle position sensor (TPS) is common failure source

on computer board of modern automobile. TPS informs

computer of opening degree of throttle, open or closed

state and open/close speed, or working conditions

where engine works. When TPS resistance changes,

the voltage signal it sends to computer changes conse-

quently.

Common throttle position sensors include two types:

one is potentiometer type sensor. When its shaft chan-

ges, it will cause resistance to change (potentiometer),

and will provide a direct current voltage. TPS is a varia-

ble resistance fixed on throttle shaft, which provides a

direct current voltage as an input signal for ECU.

The other is switch type sensor. After the signal from

this kind of sensor is input to ECU, computer is infor-

med of controlling idle (switch closed, throttle closed),

or of not controlling idle (because accelerator pedal is

pressed to make switch on), and ECU is informed of

throttle open position when the other switch is swit-

ched on. Such linear throttle position sensor is installed

on throttle shaft, with two movable contacts rotating

with the same shaft. One contact is for measuring

opening angle of throttle, and the other contact is for

measuring closing angle of throttle. Be sure to connect

circuit correctly when testing sensor.

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34 | KT720 | Measure functionen

11.6.5.1 Equipment connection

When connecting KT720 to power extension cable for

power supply, choose power supply according to the

battery position of vehicle mode tested. All connecting

diagrams in this users manual take power supply by

battery clip power cable as example. Connect BNC end

ofKT720 oscilloscope probe to CH1, then connect the

other end of the black banana plug and black alligator

clip to negative pole of battery or grounding, and con-

nect the other end of red banana plug and red banana

socket into the trigger signal line.

Fig. 17: Equipment connection

11.6.5.2 Measure conditions

RSwitch on ignition switch, do not start engine, turn

throttle to fully open position, and then turn to fully

closed position, or opposition.

11.6.5.3 Measure steps

1. Connect equipment according to Fig.17, switch on

power supply.

2. Double click run KT720 software.

3. Select communication mode: USB communication or

wireless communication, the KT720 and the compu-

ter are successfully communicated.

4. Click Analyzer --> Sensor --> TPS.

5. Waveform will be displayed on the screen depending

on measure conditions.

6. You can adjust to cycle, amplitude, coupling,

reversed-phase, and cursor. If the cycle locates at

high-frequency section, the triggering channel and

triggering modes can be adjusted.

7. You can print measured data, load snapshot data

and reference waveform data, save current confi-

guration or acquire old configuration, automatically

adjust the amplitude, snapshot current waveform

and waveform comparison;

8. You can check the details of current waveform by cli-

cking “Pause” button. After click, the button turns to

“Start”, click it again to carry forward measurement.

9. You can record a continuous waveform section by

clicking “Record” button

11.6.5.4 Waveform analysis

Potentiometer type TPS is normally a variable potenti-

ometer. Referring to repair manual from manufacturer,

you can get precise voltage range of TPS. Waveform

should be free from any breakpoint, cuspate peak TO

GROUND or large wave break. The normally closed con-

tact of switch type TPS constitutes idle switch. When

throttle is in idle position, normally closed contact is

in closed state; normally open contact indicates that

throttle opens to full load. As shown Fig.18 and Fig.19

for waveform of two throttle sensors.

Fig. 18: Throttle position sensor (potentiometer)

Fig. 19: Throttle position sensor- switch type

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Measure function | KT720 | 35 en

11.6.6 Crankshaft/Camshaft position sensor

It can be used to test waveform for electromagnetic

sensor, Hall effect sensor and photoelectric sensor.

Electromagnetic sensor (variable magnetoresistive sen-

sor) does not need external power supply, and has two

shielded lines connected to magnetostatic coil. When

trigger wheel passes the magnetic field formed by coil

and static magnet, small voltage signal is produced.

Trigger wheel is made of steel with low magnetic resis-

tance. Crankshaft position sensor (CPS), ABS wheel

sensor and automobile speed sensor are all examples

of variable magnetic resistance. Output voltage and

frequency change with vehicle speed.

Hall effect sensor has a current passing a semicon-

ductor placed very close to a variable magnetic field.

Magnetic field change occurs when crankshaft or dis-

tributor shaft rotates. Hall effect sensor is used in CPS

and distributor, and the amplitude of its output voltage

is constant, its frequency changes with speed.

Photoelectric sensor uses a rotary disc to separate

LED light source from optical pickup unit. With a small

hole in the disc, pickup unit can receive light emitted

from the light source. A pulse is sent each time pickup

unit receives light when the disc rotates and meets the

small hole. The result of voltage change can be used as

reference signal for other system, and the amplitude

of its output voltage is constant, while its frequency

changes with speed.

Camshaft sensor is normally installed in ignition distri-

butor, and sensor sends electric pulse to coil module to

provide data indicating camshaft and valve position.

11.6.6.1 Equipment connection

When connecting KT720 to power extension cable for

power supply, choose power supply according to the

battery position of vehicle mode tested. All connecting

diagrams in this users manual take power supply by

battery clip power cable as example. Connect BNC end

ofKT720 oscilloscope probe to CH1, then connect the

other end of the black banana plug and black alligator

clip to negative pole of battery or grounding, and con-

nect the other end of red banana plug and red banana

socket into the trigger signal line.

Fig. 20: Equipment connection

11.6.6.2 Measure conditions

RCheck sensor for signal output. If there is no signal

output, it is possible that sensor is damaged or lines

are poorly connected.

RIf that engine cannot be started is determined, con-

nect the instrument according to diagram and then

start engine.

RIf engine can be started, connect the instrument

according to diagram and then start engine; conduct

test in idle and relatively high speed state.

11.6.6.3 Measure steps

1. Connect equipment according to Fig.20, switch on

power supply.

2. Double click run KT720 software.

3. Select communication mode: USB communication or

wireless communication, the KT720 and the compu-

ter are successfully communicated.

4. Click Analyzer --> Sensor --> CPS.

5. Waveform will be displayed on the screen depending

on measure conditions.

6. You can adjust to cycle, amplitude, coupling,

reversed-phase, and cursor. If the cycle locates at

high-frequency section, the triggering channel and

triggering modes can be adjusted.

7. You can print measured data, load snapshot data

and reference waveform data, save current confi-

guration or acquire old configuration, automatically

adjust the amplitude, snapshot current waveform

and waveform comparison;

8. You can check the details of current waveform by cli-

cking “Pause” button. After click, the button turns to

“Start”, click it again to carry forward measurement.

1 697 021 785 | 2015-05-20 Bosch Automotive Products (Nanjing) Co., Ltd

36 | KT720 | Measure functionen

9. You can record a continuous waveform section by

clicking “Record” button.

11.6.6.4 Waveform analysis

2 kinds of waveform characteristics of the crankshaft/

camshaft position sensor as shown in follow pictures:

Fig. 21: Photoelectric CAM crankshaft position sensor

Fig. 22: Crankshaft position sensor (Hall eﬀect)

Fig. 23: Crankshaft position sensor (Magnetic)

11.6.7 Ride height (position) sensor

All kinds of position sensors produce a direct current

voltage output according to the movement of variable

resistance (potentiometer) shaft. Position sensor is a

variable resistance connected between frame and rear

axle or installed in support system. As an input signal

for ECU, variable direct current voltage is used to con-

trol vehicle height. Some manufacturers use photoelec-

tric or Hall effect sensor, corresponding sensors can be

selected for test.

11.6.7.1 Equipment connection

When connecting KT720 to power extension cable for

power supply, choose power supply according to the

battery position of vehicle mode tested. All connecting

diagrams in this users manual take power supply by

battery clip power cable as example. Connect BNC end

ofKT720 oscilloscope probe to CH1, then connect the

other end of the black banana plug and black alligator

clip to negative pole of battery or grounding, and con-

nect the other end of red banana plug and red banana

socket into the trigger signal line.

Fig. 24: Equipment connection

11.6.7.2 Measure conditions

RSwitch on ignition switch, do not start engine, se-

parate rotational shaft (fixed on the rear shaft) from

sensor, and turn the shaft from stop end to the other

end to measure the whole travel.

RSwitch on ignition switch, do not start engine, care-

fully disconnect the connecting line from sensor, and

then measure sensor resistance to make sure whe-

ther there is open or short circuit in the sensor.

RRe-install the rotational shaft to the rear shaft, and

adjust ride height sensor according to the indexes

specified in manufacturer manual.

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Measure function | KT720 | 37 en

10.6.7.3 Measure steps

1. Connect equipment according to Fig.24, switch on

power supply.

2. Double click run KT720 software.

3. Select communication mode: USB communication or

wireless communication, the KT720 and the compu-

ter are successfully communicated.

4. Click Analyzer --> Sensor --> RH(Pos) Sensor.

5. Waveform will be displayed on the screen depending

on measure conditions.

6. You can adjust to cycle, amplitude, coupling,

reversed-phase, and cursor. If the cycle locates at

high-frequency section, the triggering channel and

triggering modes can be adjusted.

7. You can print measured data, load snapshot data

and reference waveform data, save current confi-

guration or acquire old configuration, automatically

adjust the amplitude, snapshot current waveform

and waveform comparison;

8. You can check the details of current waveform by cli-

cking “Pause” button. After click, the button turns to

“Start”, click it again to carry forward measurement.

9. You can record a continuous waveform section by

clicking “Record” button.

11.6.7.4 Waveform analysis

As shown Fig.24 for waveform characteristics of ride

height (position) sensor, and different vehicle models

may have different indexes, subject to manufacturer’s

manual.

Fig. 25: Waveform characteristics

11.6.8 Anti-lock braking speed sensor

ABS control unit controls vehicle speed at braking by

comparing the frequency (instead of voltage) from ve-

hicle speed sensor, and making use of this signal. The

frequency is proportional to vehicle speed and increa-

ses when vehicle speed increases.

11.6.8.1 Equipment connection

When connecting KT720 to power extension cable for

power supply, choose power supply according to the

battery position of vehicle mode tested. All connecting

diagrams in this users manual take power supply by

battery clip power cable as example. Connect BNC end

ofKT720 oscilloscope probe to CH1, then connect the

other end of the black banana plug and black alligator

clip to negative pole of battery or grounding, and con-

nect the other end of red banana plug and red banana

socket into the trigger signal line.

Fig. 26: Equipment connection

11.6.8.2 Measure conditions

RLift vehicle body to make driving wheel hang in the

air and be able to rotate freely.

RSwitch off ignition switch, disconnect connecting

line from ABS speed sensor, connect the instrument

to ABS speed sensor, and then rotate wheel.

ROr start engine, pierce test probe into the back

of ABS speed sensor joint, place transmission to

driving gear and slowly accelerate driving; as for non-

driving wheel, refer to the above mentioned method

of switching off ignition switch.

11.6.8.3 Measure steps

1. Connect equipment according to Fig.26, switch on

power supply.

2. Double click run KT720 software.

3. Select communication mode: USB communication or

wireless communication, the KT720 and the compu-

ter are successfully communicated.

4. Click Analyzer --> Sensor --> ABS.

5. Waveform will be displayed on the screen depending

on measure conditions.

6. You can adjust to cycle, amplitude, coupling,

reversed-phase, and cursor. If the cycle locates at

high-frequency section, the triggering channel and

triggering modes can be adjusted.

7. You can print measured data, load snapshot data

and reference waveform data, save current confi-

guration or acquire old configuration, automatically

adjust the amplitude, snapshot current waveform

and waveform comparison;

1 697 021 785 | 2015-05-20 Bosch Automotive Products (Nanjing) Co., Ltd

38 | KT720 | Measure functionen

8. You can check the details of current waveform by cli-

cking “Pause” button. After click, the button turns to

“Start”, click it again to carry forward measurement.

9. You can record a continuous waveform section by

clicking “Record” button.

11.6.8.4 Waveform analysis

As shown follow picture for waveform characteristics of

ABS speed sensor.

Fig. 27: Waveform characteristics

11.6.9 Vehicle speed sensor (VSS)

The output signal of vehicle speed sensor is proporti-

onal to vehicle speed. With this signal, ECU controls

torque converter lockup clutch, shift point of electric

control transmission and other functions. The sensors

used include electromagnetic, Hall effect and photo-

electric type.

11.6.9.1 Equipment connection

When connecting KT720 to power extension cable for

power supply, choose power supply according to the

battery position of vehicle mode tested. All connecting

diagrams in this users manual take power supply by

battery clip power cable as example. Connect BNC end

ofKT720 oscilloscope probe to CH1, then connect the

other end of the black banana plug and black alligator

clip to negative pole of battery or grounding, and con-

nect the other end of red banana plug and red banana

socket into the trigger signal line.

Fig. 28: Equipment connection

11.6.9.2 Measure conditions

RLift vehicle body to make driving wheel hang in the

air and be able to rotate freely.

RConnect equipment according to Fig.28, start engine

and apply driving gear.

RMonitor the output signal of vehicle speed sensor

at low speed and gradually increase the speed of

driving wheel.

11.6.9.3 Measure steps

1. Connect equipment according to Fig.28, switch on

power supply.

2. Double click run KT720 software.

3. Select communication mode: USB communication or

wireless communication, the KT720 and the compu-

ter are successfully communicated.

4. Click Analyzer --> Sensor --> VSS.

5. Waveform will be displayed on the screen depending

on measure conditions.

6. You can adjust to cycle, amplitude, coupling,

reversed-phase, and cursor. If the cycle locates at

high-frequency section, the triggering channel and

triggering modes can be adjusted.

7. You can print measured data, load snapshot data

and reference waveform data, save current confi-

guration or acquire old configuration, automatically

adjust the amplitude, snapshot current waveform

and waveform comparison;

8. You can check the details of current waveform by cli-

cking “Pause” button. After click, the button turns to

“Start”, click it again to carry forward measurement.

9. You can record a continuous waveform section by

clicking “Record” button.

1 697 021 785 | 2015-05-20Bosch Automotive Products (Nanjing) Co., Ltd

Measure function | KT720 | 39 en

11.6.9.4 Waveform analysis

Generally, if the amplitude of waveform of electroma-

gnetic vehicle speed sensor is too low, check whether

the air gap between trigger wheel and pickup unit is too

big; if waveform is not steady, check whether trigger

wheel or shaft deforms; if there is one twisted wave-

form, check whether certain tooth of the trigger wheel

deforms or is damaged. It is basically the same case

with Hall effect sensor which produces square wave. As

shown Fig.29 and Fig.30 for waveform characteristics

of electromagnetic and photoelectric vehicle speed

sensor.

Fig. 29: Vehicle speed sensor (Magnetic)

Fig. 30: Vehicle speed sensor (Optical)

11.6.10 Air flow sensor

Analog air flow sensor: This kind of air flow sensor

uses a preheated thin metal element to measure the air

flow into the air intake manifold. This element is heated

to 77˚C and its temperature will decrease and conse-

quently its resistance will decrease when air passes it,

which causes current to increase and voltage to decre-

ase. This signal is regarded by computer as a change of

voltage reduction (increment of air flow causes voltage

reduction), and also as an indication of air flow.

Digital air flow sensor: This kind of air flow sensor

takes 5V sent by computer as reference and sends back

frequency signal equivalent to air amount of engine.

Output signal is a square wave, its amplitude is fixed at

0-5V, and signal frequency changes between 30-150Hz.

Low frequency represents small amount of air flow

while high frequency indicates large amount of air flow.

11.6.10.1 Equipment connection

When connecting KT720 to power extension cable for

power supply, choose power supply according to the

battery position of vehicle mode tested. All connecting

diagrams in this users manual take power supply by

battery clip power cable as example. Connect BNC end

ofKT720 oscilloscope probe to CH1, then connect the

other end of the black banana plug and black alligator

clip to negative pole of battery or grounding, and con-

nect the other end of red banana plug and red banana

socket into the trigger signal line.

Fig. 31: Equipment connection

11.6.10.2 Measure conditions

RConnect equipment, start engine and run it at idle,

slowly accelerate and observe display result.

RUse screwdriver handle to tap the sensor when

testing and temporary delay and unsteady accelera-

tion will be caused if the connecting line inside the

sensor is loose.

11.6.10.3 Measure steps

1. Connect equipment according to Fig.31, switch on

power supply.

2. Double click run KT720 software.

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40 | KT720 | Measure functionen

3. Select communication mode: USB communication or

wireless communication, the KT720 and the compu-

ter are successfully communicated.

4. Click Analyzer --> Sensor --> Air Flow Sensor.

5. Waveform will be displayed on the screen depending

on measure conditions.

6. You can adjust to cycle, amplitude, coupling,

reversed-phase, and cursor. If the cycle locates at

high-frequency section, the triggering channel and

triggering modes can be adjusted.

7. You can print measured data, load snapshot data

and reference waveform data, save current confi-

guration or acquire old configuration, automatically

adjust the amplitude, snapshot current waveform

and waveform comparison;

8. You can check the details of current waveform by cli-

cking “Pause” button. After click, the button turns to

“Start”, click it again to carry forward measurement.

9. You can record a continuous waveform section by

clicking “Record” button.

11.6.10.4 Waveform analysis

As shown Fig.32 and Fig.33 for waveform characteris-

tics of two air flow sensors.

Fig. 32: Mass air ﬂow meter (Digital)

Fig. 33: Mass air ﬂow meter (Analog)

11.6.11 Knock sensor-piezoelectric crystal

In order to achieve optimal performance and fuel

economy for engine, ignition time should be adjusted

properly to make combustion occur when crankshaft

rotates to a particular angle, and start at the top dead

center (TDC) of working stroke. If ignition occurs late,

the power of the cylinder decreases, if ignition occurs

early, knock occurs. Most knock sensor is made of pie-

zoelectric crystal, and bolted to engine body. It is a kind

of very special crystal which produces voltage when

it is under mechanic stress. The voltage signal differs

a lot due to knock conditions. The voltage, after being

processed by ECU, is used to adjust ignition timing to

achieve optimal engine performance.

11.6.11.1 Equipment connection

When connecting KT720 to power extension cable for

power supply, choose power supply according to the

battery position of vehicle mode tested. All connecting

diagrams in this users manual take power supply by

battery clip power cable as example. Connect BNC end

ofKT720 oscilloscope probe to CH1, then connect the

other end of the black banana plug and black alligator

clip to negative pole of battery or grounding, and con-

nect the other end of red banana plug and red banana

socket into the trigger signal line.

Fig. 34: Equipment connection

11.6.11.2 Measure conditions

Offline test of knock sensor (sensor disconnected)

RDisconnect knock sensor, and connect instrument to

sensor.

RUse mallet strike cylinder body near sensor to make

sensor produce signal.

Online test of knock sensor (delayed ignition test)

RConduct advance time test according to chapter

11.7.6.

RUse mallet strike cylinder body near sensor to make

sensor produce signal.

RObserve ignition time to confirm that ignition delays

when knock signal is received by ECU.

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Measure function | KT720 | 41 en

11.6.11.3 Measure steps

1. Connect equipment according to Fig.34, switch on

power supply.

2. Double click run KT720 software.

3. Select communication mode: USB communication or

wireless communication, the KT720 and the compu-

ter are successfully communicated.

4. Click Analyzer --> Sensor --> Knock sensor.

5. Waveform will be displayed on the screen depending

on measure conditions.

6. You can adjust to cycle, amplitude, coupling,

reversed-phase, and cursor. If the cycle locates at

high-frequency section, the triggering channel and

triggering modes can be adjusted.

7. You can print measured data, load snapshot data

and reference waveform data, save current confi-

guration or acquire old configuration, automatically

adjust the amplitude, snapshot current waveform

and waveform comparison;

8. You can check the details of current waveform by cli-

cking “Pause” button. After click, the button turns to

“Start”, click it again to carry forward measurement.

9. You can record a continuous waveform section by

clicking “Record” button.

11.6.11.4 Waveform analysis

The waveform of knock sensor has direct relation with

knock degree and reason, so each waveform looks a litt-

le different. Knock sensor mainly checks whether there

is signal. For most vehicles, when ECU receives signal

from knock sensor, it will delay ignition till knock disap-

pears. As shown Fig.35 for characteristic waveform of

ordinary knock.

Fig. 35: Waveform characteristic

11.7 Actuator measure

Measured the waveform of actuator.

11.7.1 Exhaust gas recirculation

EGR valve position sensor is a variable resistance

connected to EGR valve. EGR valve position sensor

provides a direct current voltage which changes with

the movement of knob on the variable resistance (po-

tentiometer). Variable direct current voltage is used as

input signal by computer to indicate working conditions

of EGR.

When engine has excessive combustion temperature

and air-fuel ratio is lean, EGR system dilutes air fuel

ratio and limits formation of NOx. Gasoline engine EGR

should work at middle acceleration and cruise speed

between 50-120Km/h. Computer makes use of method

of providing power supply or cutting off solenoid coil,

or uses pulse width modulated solenoid, to switch on

or switch off solenoid coil to achieve the goal of cont-

rolling vacuum.

11.7.1.1 Equipment connection

When connecting KT720 to power extension cable for

power supply, choose power supply according to the

battery position of vehicle mode tested. All connecting

diagrams in this users manual take power supply by

battery clip power cable as example. Connect BNC end

ofKT720 oscilloscope probe to CH1, then connect the

other end of the black banana plug and black alligator

clip to negative pole of battery or grounding, and con-

nect the other end of red banana plug and red banana

socket into the trigger signal line.

Fig. 36: Equipment connection

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42 | KT720 | Measure functionen

11.7.1.2 Measure conditions

RStart engine, connect KT720 to EGR valve, and slow-

ly increase engine speed to cruise speed.

iMost EGR valves only start when engine is at load

state. Therefore, it is possible to use road test or

make use of horsepower tester to assist test.

!Only conduct the following tests when engine is at

cold state to avoid burn.

RIgnition switch is at switch-on position, engine stops,

insert probe into position sensor on the top of EGR

valve, and carefully (cold engine) lift EGR from chas-

sis. If EGR diaphragm has obstacle or is not easily

accessible, it is possible to move EGR valve when

vehicle is at load state.

RSwitch off ignition switch, disconnect sensor, and

then carefully lift EGR valve from chassis. Some posi-

tion sensors can be disconnected from EGR valve so

as to make sensor terminal accessible;

RApply potentiometer test function of common sen-

sors when testing position sensor.

11.7.1.3 Measure steps

1. Connect equipment according to Fig.36, switch on

power supply.

2. Double click run KT720 software.

3. Select communication mode: USB communication or

wireless communication, the KT720 and the compu-

ter are successfully communicated.

4. Click Analyzer --> Actuator --> EGT.

5. Waveform will be displayed on the screen depending

on measure conditions.

6. You can adjust to cycle, amplitude, coupling,

reversed-phase, and cursor. If the cycle locates at

high-frequency section, the triggering channel and

triggering modes can be adjusted.

7. You can print measured data, load snapshot data

and reference waveform data, save current confi-

guration or acquire old configuration, automatically

adjust the amplitude, snapshot current waveform

and waveform comparison.

8. You can check the details of current waveform by cli-

cking “Pause” button. After click, the button turns to

“Start”, click it again to carry forward measurement.

9. You can record a continuous waveform section by

clicking “Record” button.

10.7.1.4 Waveform analysis

Most vehicles start exhaust gas recirculation control

when they travel or accelerate. EGR system does not

work when engine runs at idle and decelerates since

control signal is cut off. Peak height of waveform redu-

ces when failure occurs, which indicates that vacuum

solenoid coil of EGR is short; if no control signal is

found, it indicates that failure occurs to PCM or EGR

control conditions for PCM does not meet, or there is

something wrong with the circuit of EGR system.

11.7.2 Fuel Injection(FI)

Electronically-controlled fuel injection is controlled by

computer and also affected by many working factors,

including water temperature, engine load and oxygen

sensor signal in closed-loop work.

Fuel injection time can be expressed in pulse width in

ms, representing the amount of fuel injected into the

cylinder. Wide pulse indicates more fuel injected under

the same injection pressure. ECU provides a path for

nozzle through a driving triode. When triode is through,

current passes from nozzle and triode to ground, which

makes nozzle open There are three kinds of fuel injec-

tion system currently, and each has its own fuel injec-

tion control method. All nozzles have a method of limi-

ting current, because large current will damage nozzle.

Peak value keeping type: In nozzle circuit, nozzle is

actually powered by two different circuits. When two

circuits work for nozzle at the same time, nozzle is

supplied with high starting current and opens quickly;

after nozzle opens, one of the circuits is cut off, and the

other circuit continues to work to keep the nozzle open

till the end of injection time. In the circuit, one resis-

tance is used to reduce the current passing through

nozzle. When the second circuit is cut off, nozzle clo-

ses, and fuel injection ends. The method for measuring

opening time is to locate the falling edge of opening

pulse and the rising edge representing the second

circuit is cut off.

Throttle injection system: is designed to take the place

of carburetor, and pulse width represents working or

opening time of nozzle. ECU controls pulse width accor-

ding to engine working and driving conditions.

The triode of traditional (saturated switch type): nozz-

le provides nozzle with fixed current. Some nozzles use

resistance to control current, and other nozzles have

high internal impedance, with only one injection pulse.

Nozzles of pulse width: modulation type have high

starting current to quickly open nozzle. After nozzle

opens, pulse switch-on begins at grounding end to cut

current off to extend opening time of nozzle, and limit

the current passing through nozzle at the same time.

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11.7.2.1 Equipment connection

When connecting KT720 to power extension cable for

power supply, choose power supply according to the

battery position of vehicle mode tested. All connecting

diagrams in this users manual take power supply by

battery clip power cable as example. Connect BNC end

of 1 cylinder signal to CH3 of KT720,use signal clip to

clip high voltage line of one cylinder of engine. Please

check that there is “This side faces to spark plug” on

the signal clip, do not clip reversely. Connect BNC end

of mulriple end ofKT720 differential probes to CH4,

connect the other end of mulriple end to assistant chan-

nel. Then connect the other end of the black banana

plug ofKT720 differential probes and black alligator

clip to negative pole of battery or grounding, and con-

nect the other end of red banana plug and red banana

socket into the signal line. Multi-point fuel injection

connection method as shown fig. 37, single-point fuel

injection connection methods as shown fig. 38.

Fig. 37: Connecting diagram of multi-point fuel injection

Fig. 38: Connecting diagram of single point fuel injection

!Inductive pickup measures speed signal of engine. If

engine speed is not displayed inKT720 , re-clip the

high voltage line after turning it 180˚C.

11.7.2.2 Measure conditions

RStart engine after connecting equipment. Start test

from idle, slowly increase engine speed and observe

nozzle signal at the same time.

RChange output signal of MAP sensor or oxygen sen-

sor to increase engine load.

RAnother method is to disconnect oxygen sensor,

which will decrease the voltage signal sent to ECU,

and ECU will increase injection pulse width, but this

method may lead to occurrence of DTC.

RConnect signal end of oxygen sensor to positive (+)

of battery to increase the voltage signal sent to ECU,

and ECU will decrease injection pulse width.

11.7.2.3 Measure steps

1. Connect equipment according to Fig.37 or Fig.38,

switch on power supply.

2. Double click run KT720 software.

3. Select communication mode: USB communication or

wireless communication, the KT720 and the compu-

ter are successfully communicated.

4. Click Analyzer --> Actuator --> FI.

5. Waveform will be displayed on the screen depending

on measure conditions.

6. You can adjust to cycle, amplitude, coupling, rever-

sed-phase, and cursor.

7. You can print measured data, load snapshot data

and reference waveform data, save current configu-

ration or acquire old configuration, snapshot current

waveform and waveform comparison;

8. You can check the details of current waveform by cli-

cking “Pause” button. After click, the button turns to

“Start”, click it again to carry forward measurement.

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11.7.2.4 Waveform analysis

As shown Fig.39, 40 and 41 for waveform characteris-

tics of all nozzles.

Fig. 39: Conventional (Saturated switch driver) fuel injector

Fig. 40: Pulse-sidth modulated fuel injector

Fig. 41: Current-controlled (Peak and hold) fuel injector (Throttle

body and port fuel injection systems)

11.7.3 Coil and diode test

When the energy of electromagnetic control unit dis-

appears, change of magnetic field can induce burr of

voltage. Clamping diode (or suppression diode) is used

to filter these burrs, horn, relay, fan motor, clutch of air

conditioning compressor and some fuel injection equip-

ment are all examples.

A faulty diode produces noises that can be heard

normally in sound system of vehicle. The waveform of

these noise burrs will contain big burr when one level

changes to another. These burrs can also affect sensiti-

ve sensors or control system in the vehicle.

11.7.3.1 Equipment connection

When connecting KT720 to power extension cable for

power supply, choose power supply according to the

battery position of vehicle mode tested. All connecting

diagrams in this users manual take power supply by

battery clip power cable as example. Connect BNC end

ofKT720 oscilloscope probe to CH1, then connect the

other end of the black banana plug and black alligator

clip to negative pole of battery or grounding, and con-

nect the other end of red banana plug and red banana

socket into into the power supply of solenoid coil.

Fig. 42: Equipment connection

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11.7.3.2 Measure conditions

RExcite tested equipment, and then observe display of

KT720 .

10.7.3.3 Measure steps

1. Connect equipment according to Fig.42 switch on

power supply.

2. Double click run KT720 software.

3. Select communication mode: USB communication or

wireless communication, the KT720 and the compu-

ter are successfully communicated.

4. Click Analyzer --> Actuator --> MC.

5. Waveform will be displayed on the screen depending

on measure conditions.

6. You can adjust to cycle, amplitude, coupling,

reversed-phase, and cursor. If the cycle locates at

high-frequency section, the triggering channel and

triggering modes can be adjusted.

7. You can print measured data, load snapshot data

and reference waveform data, save current confi-

guration or acquire old configuration, automatically

adjust the amplitude, snapshot current waveform

and waveform comparison;

8. You can check the details of current waveform by cli-

cking “Pause” button. After click, the button turns to

“Start”, click it again to carry forward measurement.

9. You can record a continuous waveform section by

clicking “Record” button.

11.7.3.4 Waveform analysis

As shown Fig.43 for characteristic waveform of clam-

ping diode.

Fig. 43: Waveform characteristic

11.7.4 Idle air/speed control (IAC/ISC)

Idle air controller (IAC) of engine control unit adjusts

engine idle and prevents stop. Some idle control system

adopts step motor to control the air flow into bypass of

throttle; other idle control systems use bypass control

valve controlled by square wave signal sent by ECU.

Due to impedance of coil, the square wave signals may

be slightly different in shape.

11.7.4.1 Equipment connection

When connecting KT720 to power extension cable for

power supply, choose power supply according to the

battery position of vehicle mode tested. All connecting

diagrams in this users manual take power supply by

battery clip power cable as example. Connect BNC end

ofKT720 oscilloscope probe to CH1, then connect the

other end of the black banana plug and black alligator

clip to negative pole of battery or grounding, and con-

nect the other end of red banana plug and red banana

socket into the single line.

Fig. 44: Equipment connection

11.7.4.2 Measure conditions

RStart engine after connecting instrument to air con-

trol valve, and monitor conditions in cold, warm and

hot engine state.

RIntentionally cause small vacuum leak and pay at-

tention to the signal from engine control unit how to

adjust opening of valve.

11.7.4.3 Measure steps

1. Connect equipment according to Fig.44, switch on

power supply.

2. Double click run KT720 software.

3. Select communication mode: USB communication or

wireless communication, the KT720 and the compu-

ter are successfully communicated.

4. Click Analyzer --> Actuator --> IAC/ISC.

5. Waveform will be displayed on the screen depending

on measure conditions.

6. You can adjust to cycle, amplitude, coupling,

reversed-phase, and cursor. If the cycle locates at

high-frequency section, the triggering channel and

triggering modes can be adjusted.

7. You can print measured data, load snapshot data

and reference waveform data, save current confi-

guration or acquire old configuration, automatically

adjust the amplitude, snapshot current waveform

and waveform comparison;

8. You can check the details of current waveform by cli-

cking “Pause” button. After click, the button turns to

“Start”, click it again to carry forward measurement.

9. You can record a continuous waveform section by

clicking “Record” button.

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11.7.4.4 Waveform analysis

When switches for accessorial appliances (air condi-

tioning, etc.) switch on or off and transmission apply

or does not apply, engine control unit will change idle

by controlling IAC/ISC to open/close throttle bypass. If

idle remains unchanged, it is the most possible reason

that IAC/ISC is damaged or throttle bypass is blocked.

As shown Fig.45 for characteristic waveform of common

IAC/ISC, and refer to manufacturer’s manual for possib-

le special shapes.

Fig. 45: Waveform characteristic

11.7.5 Distributor trigger

Electromagnetic distributor trigger: the electromagne-

tic sensor used for distributor trigger consists of a per-

manent magnet and a magnetic core. Filament wrapped

on the core functions as pickup coil. Non-magnetic trig-

ger wheel is installed on distributor shaft and has the

same number of teeth as cylinder number. When one

tooth of trigger wheel passes magnetic field (formed by

pickup coil), a signal is produced. Magnetic sensor or

variable magnetoresistive sensor usually has two con-

ducting wires and produces its own signal.

Hall effect distributor trigger: Hall effect switch has a

fixed sensor and a trigger wheel, and requires a small

input voltage to produce output voltage. When rotary

vane passes through between magnet and Hall element,

output voltage changes. This signal is sent, in square

waveform, to ignition module to trigger ignition coil.

Photoelectric distributor trigger: photoelectric signal

generator produces voltage signal by using light pro-

duced by LED to trigger photoelectric triode. Trigger

wheel is a piece of disc with small hole, which rotates

in the clearance between LED and photoelectric triode.

11.7.5.1 Equipment connection

When connecting KT720 to power extension cable for

power supply, choose power supply according to the

battery position of vehicle mode tested. All connecting

diagrams in this users manual take power supply by

battery clip power cable as example. Connect BNC end

ofKT720 oscilloscope probe to CH1, then connect the

other end of the black banana plug and black alligator

clip to negative pole of battery or grounding, and con-

nect the other end of red banana plug and red banana

socket into the single line.

Fig. 46: Equipment connection

11.7.5.2 Measure conditions

RIf you are diagnosing “Cannot start” failure, connect

wires as connection note, and then start engine.

Check whether there is signal. If there is, problem is

not here; if there is no signal or signal is too weak,

check whether sensor fails or lines have problem.

RIf engine can be started, connect wires as connec-

tion note. Start engine, and check engine in various

working conditions.

11.7.5.3 Measure steps

1. Connect equipment according to Fig.46, switch on

power supply.

2. Double click run KT720 software.

3. Select communication mode: USB communication or

wireless communication, the KT720 and the compu-

ter are successfully communicated.

4. Click Analyzer --> Actuator --> DIST Trig.

5. Waveform will be displayed on the screen depending

on measure conditions.

6. You can adjust to cycle, amplitude, coupling,

reversed-phase, and cursor. If the cycle locates at

high-frequency section, the triggering channel and

triggering modes can be adjusted.

7. You can print measured data, load snapshot data

and reference waveform data, save current confi-

guration or acquire old configuration, automatically

adjust the amplitude, snapshot current waveform

and waveform comparison;

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8. You can check the details of current waveform by cli-

cking “Pause” button. After click, the button turns to

“Start”, click it again to carry forward measurement.

9. You can record a continuous waveform section by

clicking “Record” button.

11.7.5.4 Waveform analysis

As shown Fig.47, 48 and 49 for characteristic waveform

triggered by three kinds of distributors.

Fig. 47: Primary distributor triggering (Hall eﬀect)

Fig. 48: Primary distributor triggering (Magnetic)

Fig. 49: Primary distributor triggering (Optical)

11.7.6 Advance time

Two channels of KT720 can determine ignition advance

time of the ignition system. Connect CH1 to the first

cylinder or primary of ignition coil (ignition module),

and CH2 to TDC signal.

11.7.6.1 Equipment connection

When connecting KT720 to power extension cable for

power supply, choose power supply according to the

battery position of vehicle mode tested. All connecting

diagrams in this users manual take power supply by

battery clip power cable as example. Connect BNC end

of 2KT720 oscilloscope probes to CH1 and CH2, and

connect BNC end of 1 cylinder signal to CH3, then con-

nect the other end of the both black banana plugs and

2 alligator clips to negative pole of battery or ground-

ing, and connect the other end of red banana plugs and

2 banana sockets into the “-“ connector of ignition coil

and signal line of crankshaft position sensor.

②

①

③

Fig. 50: Equipment connection

1 1 Cylinder Signal

2 Battery

3 Capacitive Pickup

11.7.6.2 Measure conditions

RConnectKT720 , and the test line on Channel CH2

cannot be grounded.

RStart engine and let it run at idle, slowly accelerate it

and observe result displayed on the screen.

RWhen electronic and mechanic (if found) advances

begin to function, the increment of ignition advance

can be observed.

11.7.6.3 Measure steps

1. Connect equipment according to Fig.50, switch on

power supply.

2. Double click run KT720 software.

3. Select communication mode: USB communication or

wireless communication, the KT720 and the compu-

ter are successfully communicated.

4. Click Analyzer --> Actuator --> Adv Time.

5. Waveform will be displayed on the screen depending

on measure conditions.

6. You can adjust to cycle, amplitude, coupling,

reversed-phase, and cursor. If the cycle locates at

high-frequency section, the triggering channel and

triggering modes can be adjusted.

7. You can print measured data, load snapshot data

and reference waveform data, save current confi-

guration or acquire old configuration, automatically

adjust the amplitude, snapshot current waveform

and waveform comparison;

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8. You can check the details of current waveform by cli-

cking “Pause” button. After click, the button turns to

“Start”, click it again to carry forward measurement.

9. You can record a continuous waveform section by

clicking “Record” button.

11.7.6.4 Waveform analysis

As shown Fig.51 for characteristic waveform.

Fig. 51: Waveform characteristic

11.8 Ignition system

Measured the waveform of secondary and primary igni-

tion.

iIf the ignition cylinder is greater than 4, you need to

used 2 capacitive pickup to measured.

11.8.1 Secondary ignition

We can effectively check traveling performance of ve-

hicle and reason for emission problem through analysis

of ignition secondary waveform. Generally, the wave-

form is mainly used to check whether high voltage line

of spark plug is short or open, and whether spark plug

misfires due to carbon deposit. Secondary waveform of

ignition is also affected by different engine, fuel supply

system, air intake system and ignition condition, so we

can effectively test the failure in mechanic parts of en-

gine, fuel supply system parts and ignition system parts

in accordance with secondary waveform of ignition.

When testing, we generally divide into three kinds

according to ignition system: traditional ignition, direct

ignition and double end ignition. Traditional ignition

generally refers to distributor ignition, which is usu-

ally adopted by domestic vehicles of old model; direct

ignition generally refers to ignition mode in which one

cylinder corresponds to one ignition coil, which is nor-

mally used in high grade car; double end ignition means

one ignition coil ignites two cylinders at the same time,

which is common currently in Era Superman, JETTA GT,

Fukang and Audi V6 engine.

11.8.1.1 Equipment connection

Since ignition mode and ignition system of the engines

to be tested differ in connection, connecting method is

also different. Please confirm ignition mode of engine

to be tested before testing secondary ignition wave-

form. We will illuminate the test and connecting method

of three common ignition modes in the following.

When connecting KT720 to extension line for power

supply, choose power supply according to the bat-

tery position of vehicle mode tested. All connecting

diagrams in this users manual take power supply by

battery as example.

Traditional ignition / Direct ignition: Connect BNC end

of 1 cylinder signal to CH3 ofKT720 , use signal clip to

clip high voltage line of one cylinder of engine. Please

check that there is “This side faces to spark plug” on

the signal clip, do not clip reversely; connect BNC end

of capacitive pickup to CH1, and then use capacitive

pickup to clip high voltage line of each cylinder. As

shown Fig.52 for connecting method.

①②

③

Fig. 52: Equipment connection of traditional ignition

1 1 Cylinder Signal

2 Capacitive Pickup

3 Battery

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Double end ignition: Connect BNC end of 1 cylinder

signal to CH3 ofKT720 , used for synchronization of cy-

linder signal, use signal clip to clip high voltage line of

one cylinder of engine. Please check that there is “This

side faces to spark plug” on the signal clip, do not clip

reversely. Connect BNC end of one capacitive pickup

to CH1, then connect the other end to positive of high

voltage cylinder line. Connect BNC end of the other

capacitive pickup to CH2, then connect the other end to

negative of high voltage cylinder line. As shown Fig.53

for connecting method.

③

④

①

②

Fig. 53: Equipment connection of double end ignition

1 Capacitive Pickup

2 Capacitive Pickup

3 1 Cylinder Signal

4 Battery

11.8.1.2 Measure conditions

RStart engine, and test the performance of testing

elements at different load and speed. Spark plug,

ignition connector and the elements of other secon-

dary circuit may function abnormally at high load.

Conduct these tests (on power tester or road test)

at load state to precisely locate failure position in

the system.

11.8.1.3 Measure steps

1. Connect equipment according to Fig.52 or Fig. 53,

switch on power supply.

2. Double click run KT720 software.

3. Select communication mode: USB communication or

wireless communication, the KT720 and the compu-

ter are successfully communicated.

4. Click Analyzer --> Ignition SYS --> Secondary IGN -->

Spark Test.

5. Waveform will be displayed on the screen depending

on measure conditions.

6. Depending on the parameters of engine to set IGN

settings, include ignition mode, sensation,number of cylin-

der and ignition order.

7. You can adjust to cycle, amplitude, and cursor.

8. You can print measured data, load snapshot data

and reference waveform data, save current configu-

ration or acquire old configuration, snapshot current

waveform, display mode of waveform and waveform

comparison;

9. You can check the details of current waveform by cli-

cking “Pause” button. After click, the button turns to

“Start”, click it again to carry forward measurement.

11.8.1.4 Waveform analysis

Secondary waveform of ignition is divided three parts:

closed part, ignition part and middle part.

Closed part: This period of time is the time when trio-

de is on or platinum contact is connected, and falling

edge of waveform should be kept consistent, indicating

that each cylinder has the same dwell angle and igniti-

on timing is correct.

Ignition part: including an ignition line and a spark line

(combustion line). Ignition line is a vertical line, repre-

senting breakdown voltage; spark line is an approxi-

mate horizontal line, representing a voltage needed to

keep current pass clearance of spark plug.

Middle part: it displays that ignition coil consumes sur-

plus energy through primary and secondary oscillation,

normally 2 oscillatory wave at least. As shown Fig.54

for characteristic waveform of traditional secondary

ignition.2

Fig. 54: Waveform characteristic

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11.8.2 Primary ignition

The display of primary ignition dwell angle brings con-

venience for diagnosis of traditional ignition. The ad-

vent of electronic ignition control system removes the

need to adjust dwell angle since ignition dwell angle

is controlled by ECU. Due to mutual inductance of pri-

mary and secondary coil of ignition, spark that occurs

at secondary circuit will be fed back to primary circuit,

therefore, primary ignition is also very important.

Primary Ignition have 2 modes: multi-cylinder and

single -cylinder.

11.8.2.1 Equipment connection

When connecting KT720 to extension line for power

supply, choose power supply according to the battery

position of vehicle mode tested. All connecting dia-

grams in this users manual take power supply by batte-

ry as example.

Connect one end of 1 cylinder signal to CH3 ofKT720 ,

use signal clip to clip high voltage line of one cylinder

of engine. Please check that there is “This side faces

to spark plug” on the signal clip, do not clip reversely.

Connect BNC end ofKT720 oscilloscope probe to CH1,

then connect the other end of the black banana plug

and black alligator clip to negative pole of battery or

grounding, and connect the other end of red banana

plug and red banana socket into “IG-“ signal line of

ignition coil, as shown Fig.55.

1 Cylinder Signal

Fig. 55: Equipment connection

Primary ignition single-cylinder mode connection me-

thod 1: When the trigger channel is CH3, connect one

end of 1 cylinder signal to CH3 of Kt720, use signal clip

to clip high voltage line of one cylinder of engine. Ple-

ase check that there is "This side faces to spark plug"

on the signal clip, do not clip reversely. Connect BNC

end of VMI differential probe composite joint to CH4

port, the other port connect to auxiliary port. Then con-

nect the other end of the black banana plug of VMI dif-

ferential probe and black alligator clip to negative pole

of battery or grounding, and connect the other end of

red banana plug of VMI differential probe and red bana-

na socket into "IG-"signal line of ignition coil.

11.8.2.2 Measure conditions

RStart engine, and test ignition system at different

load to test the performance of elements. Primary

ignition module may not work properly at high load

and high temperature.

11.8.2.3 Measure steps

1. Connect equipment according to Fig.55, switch on

power supply.

2. Double click run KT720 software.

3. Select communication mode: USB communication or

wireless communication, the KT720 and the compu-

ter are successfully communicated.

4. Click Analyzer --> Ignition SYS --> Primary IGN -->

Multi-Cylinder mode or Single-Cylinder mode.

5. Waveform will be displayed on the screen depending

on measure conditions.

6. Depending on the parameters of engine to set IGN

settings, include ignition mode, sensation,number of cylin-

der and ignition order.

7. You can adjust to cycle, amplitude, and cursor.

8. You can print measured data, load snapshot data

and reference waveform data, save current configu-

ration or acquire old configuration, snapshot current

waveform, display mode of waveform and waveform

comparison;

9. You can check the details of current waveform by cli-

cking “Pause” button. After click, the button turns to

“Start”, click it again to carry forward measurement.

11.8.2.4 Waveform analysis

Observe whether the height of ignition breakdown

peak voltage of each cylinder is relatively consistent,

and change of dwell angle when engine load and speed

change.

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11.9 Electrical system

Measured the waveform of electrical system.

11.9.1 Battery test

The problem of charging system is usually from vehicle

owner who complains about “Cannot start”, battery

cannot provide electric energy at this time, while star-

ting motor cannot drive engine. The first step usually is

to test battery, and charge battery first if necessary.

When measuring system voltage, surface charge of the

battery can be released several minutes after turning on

headlight, and then turn off headlight and measure the

voltage between two terminals of the battery. If possi-

ble, use gravimeter to measure specific gravity of each

separate cell of the battery. Battery load test should be

conducted to check battery performance at load state.

Because only charging state is displayed in voltage test,

not in battery conditions.

11.9.1.1 Equipment connection

When connecting KT720 to power extension cable,

choose power supply according to the battery position

of vehicle mode tested. All connecting diagrams in this

users manual take power supply by battery as example.

Connect BNC end ofKT720 oscilloscope probe to CH1,

then connect the other end of the black banana plug

and black alligator clip to negative pole of battery or

grounding, and connect the other end of red banana

plug and red banana socket to positive of battery.

11.9.1.2 Measure conditions

Let headlight on for about 3 minutes to remove the sur-

face charge in the battery.

11.9.1.3 Measure steps

1. Connect equipment, switch on power supply.

2. Double click run KT720 software.

3. Select communication mode: USB communication or

wireless communication, the KT720 and the compu-

ter are successfully communicated.

4. Click Analyzer --> Electrical SYS --> Battery Test.

5. Waveform will be displayed on the screen depending

on measure conditions.

6. You can adjust to cycle, amplitude, coupling,

reversed-phase, and cursor. If the cycle locates at

high-frequency section, the triggering channel and

triggering modes can be adjusted.

7. You can print measured data, load snapshot data

and reference waveform data, save current confi-

guration or acquire old configuration, automatically

adjust the amplitude, snapshot current waveform

and waveform comparison;

8. You can check the details of current waveform by cli-

cking “Pause” button. After click, the button turns to

“Start”, click it again to carry forward measurement.

11.9.1.4 Waveform analysis

Generally, amplitude value of battery voltage is dis-

played as a line on the oscillograph.

11.9.2 Charge test

Charging output test: new electric regulator can main-

tain charging voltage between 13-15V, and charging

system must provide sufficient output to maintain bat-

tery charging and need of vehicle.

Test rectifying diode: three-phase alternator uses three

pairs of diodes to rectify output current. These diodes

are usually installed on a insulating radiating seat or in

rectifying bridge. Diode allows current to pass through

in only one direction but not in the other. If diode is

short, current can pass through in both directions; if

open, current can pass through in neither direction.

The way of testing open or short diode is to connect

one end of testing line of KT720 to one end of the

diode, and to connect the other testing line to radiating

seat or generator housing. And then test again in rever-

se direction. It should be displayed on KT720 that one

direction is on while the other direction is off. If the tes-

ting result is on in both directions, the diode is short. If

it is off in both directions, the diode is open.

11.9.2.1 Equipment connection

When connecting KT720 to power extension cable,

choose power supply according to the battery position

of vehicle mode tested. All connecting diagrams in this

users manual take power supply by battery as example.

Connect BNC end ofKT720 oscilloscope probe to CH1,

then connect the other end of the black banana plug

and black alligator clip to the negative of battery or

grounding. For different function test, the test location

ofKT720 oscilloscope probe is also different. Refer to

testing conditions for details.

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11.9.2.2 Measure conditions

RConnect KT720 to the generator on the vehicle, as

shown in Fig.56.

RStart engine, and conduct test at idle and load state,

slowly increase engine speed.

RTurn on the electric appliances on the vehicle to

make charging system loaded, such as headlight,

water tank fan motor and wiper, etc.

Fig. 56: Equipment connection

11.9.2.3 Measure steps

1. Connect equipment, switch on power supply.

2. Double click run KT720 software.

3. Select communication mode: USB communication or

wireless communication, the KT720 and the compu-

ter are successfully communicated.

4. Click Analyzer --> Electrical SYS --> Charge Test.

5. Waveform will be displayed on the screen depending

on measure conditions.

6. You can adjust to cycle, amplitude, coupling,

reversed-phase, and cursor. If the cycle locates at

high-frequency section, the triggering channel and

triggering modes can be adjusted.

7. You can print measured data, load snapshot data

and reference waveform data, save current confi-

guration or acquire old configuration, automatically

adjust the amplitude, snapshot current waveform

and waveform comparison;

8. You can check the details of current waveform by cli-

cking “Pause” button. After click, the button turns to

“Start”, click it again to carry forward measurement.

9. You can record a continuous waveform section by

clicking “Record” button.

11.9.2.4 Waveform analysis

The waveform of charging voltage is a steady line.

11.9.3 Current waveform

Current waveform is be used to measure paramenter

trends at work of vehicle electrical lines.

iCurrent waveform must be connected current clamp

to measured.

11.9.3.1 Equipment connection

When connecting KT720 to power extension cable,

choose power supply according to the battery position

of vehicle mode tested. All connecting diagrams in this

users manual take power supply by battery as example.

Connect BNC end ofKT720 oscilloscope probe to CH3,

then connect the other end of the black banana plug

and black alligator clip to negative pole of battery or

grounding, and connect the other end of red banana

plug and red banana socket to positive of battery.

iDC 1000A current clamp should be reverse connec-

ted to positive of battery, and the other end connec-

ted to CH4.

Fig. 57: Current clamp connection

11.9.3.2 Measure conditions

RTurn off before connected cables.

RTurn on after connected cables, then automatically

measured.

11.9.3.3 Measure steps

1. Connect equipment, switch on power supply.

2. Double click run KT720 software.

3. Select communication mode: USB communication or

wireless communication, the KT720 and the compu-

ter are successfully communicated.

4. Click Analyzer --> Electrical SYS --> Current Wave-

form.

5. Waveform will be displayed on the screen depending

on measure conditions.

6. You can adjust to cycle, amplitude, coupling,

reversed-phase, and cursor. If the cycle locates at

high-frequency section, the triggering channel and

triggering modes can be adjusted.

7. You can print measured data, load snapshot data

and reference waveform data, save current confi-

guration or acquire old configuration, automatically

adjust the amplitude, snapshot current waveform

and waveform comparison;

8. You can check the details of current waveform by cli-

cking “Pause” button. After click, the button turns to

“Start”, click it again to carry forward measurement.

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9. You can record a continuous waveform section by

clicking “Record” button.

11.10 Communication system

Measure waveform of the vehicle’s communication sys-

tem.

11.10.1 High-speed CAN communication

As for high-speed CANBUS test, the waveform data of

CAN bus can be acquired by the user.

11.10.1.1 Equipment connection

Connect KT720 and extension line of power supply,

choose power supply mode according to battery loca-

tion of the vehicle to be tested. Connect BNC end of

OSC detector to CH1; then connect the alligator clip

of the probe to the vehicle ground or battery negative

pole, and connect the other end of the probe to CAN_H

and CAN_L of CAN network.

11.10.1.2 Measure conditions

RTurn the key to position ON.

RIf diagnostic data needs to be viewed, a diagnostic

analysis shall be conducted on ECU during measure-

ment.

11.10.1.3 Measure steps

1. Connect equipment, switch on power supply.

2. Double click run KT720 software.

3. Select communication mode: USB communication or

wireless communication, the KT720 and the compu-

ter are successfully communicated.

4. Click Analyzer --> Communication SYS --> High-

Speed CAN.

5. Waveform will be displayed on the screen depending

on measure conditions.

6. You can adjust to cycle, amplitude, coupling,

reversed-phase, and cursor. If the cycle locates at

high-frequency section, the triggering channel and

triggering modes can be adjusted.

7. You can print measured data, load snapshot data

and reference waveform data, save current confi-

guration or acquire old configuration, automatically

adjust the amplitude, snapshot current waveform

and single change between simulation model and

digtal model;

8. You can check the details of current waveform by cli-

cking “Pause” button. After click, the button turns to

“Start”, click it again to carry forward measurement.

11.10.2 Low-speed CAN communication

As for low-speed CANBUS test, the waveform data of

CAN bus can be acquired by the user.

11.10.2.1 Equipment connection

Connect KT720 and extension line of power supply,

choose power supply mode according to battery lo-

cation of the vehicle to be tested. Connect BNC end

ofKT720 oscilloscope probe to CH1, then connect the

other end of the black banana plug and black alligator

clip to negative pole of battery or grounding, and con-

nect the other end of red banana plug and red banana

socket to CAN_H and CAN_L of CAN network.

11.10.2.2 Measure conditions

RTurn the key to position ON.

RIf diagnostic data needs to be viewed, a diagnostic

analysis shall be conducted on ECU during measure-

ment.

11.10.2.3 Measure steps

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1. Connect equipment, switch on power supply.

2. Double click run KT720 software.

3. Select communication mode: USB communication or

wireless communication, the KT720 and the compu-

ter are successfully communicated.

4. Click Analyzer --> Communication SYS --> Low-

Speed CAN.

5. Waveform will be displayed on the screen depending

on measure conditions.

6. You can adjust to cycle, amplitude, coupling,

reversed-phase, and cursor. If the cycle locates at

high-frequency section, the triggering channel and

triggering modes can be adjusted.

7. You can print measured data, load snapshot data

and reference waveform data, save current confi-

guration or acquire old configuration, automatically

adjust the amplitude, snapshot current waveform

and single change between simulation model and

digtal model;

8. You can check the details of current waveform by cli-

cking “Pause” button. After click, the button turns to

“Start”, click it again to carry forward measurement.

11.10.3 K-line communication

The waveform data of K-line can be acquired by the

user.

11.10.3.1 Equipment connection

Connect KT720 and extension line of power supply,

choose power supply mode according to battery lo-

cation of the vehicle to be tested. Connect BNC end

ofKT720 oscilloscope probe to CH1, then connect the

other end of the black banana plug and black alligator

clip to negative pole of battery or grounding, and con-

nect the other end of red banana plug and red banana

socket to K-line network.

11.10.3.2 Measure conditions

RTurn the key to position ON.

RIf diagnostic data needs to be viewed, a diagnostic

analysis shall be conducted on ECU during measure-

ment.

10.10.3.3 Measure steps

1. Connect equipment, switch on power supply.

2. Double click run KT720 software.

3. Select communication mode: USB communication or

wireless communication, the KT720 and the compu-

ter are successfully communicated.

4. Click Analyzer --> Communication SYS --> K-Line.

5. Waveform will be displayed on the screen depending

on measure conditions.

6. You can adjust to cycle, amplitude, coupling,

reversed-phase, and cursor. If the cycle locates at

high-frequency section, the triggering channel and

triggering modes can be adjusted.

7. You can print measured data, load snapshot data

and reference waveform data, save current confi-

guration or acquire old configuration, automatically

adjust the amplitude, snapshot current waveform

and single change between simulation model and

digtal model;

8. You can check the details of current waveform by cli-

cking “Pause” button. After click, the button turns to

“Start”, click it again to carry forward measurement.

11.11 Multimeter

It is used to measure values of DC voltage, AC voltage,

switch, resistance and diode. Value of DC voltage can

be measured through CH1, CH2, CH3 and CH4, and va-

lues of AC voltage, switch and resistance and diode can

be measured through CH4 only.

Judge channel by the color displayed. Red indicates

CH1, Blue indicates CH2, Green indicates CH3, Yellow

indicates CH4.

Display modes of measured values: including display by

panel, display by column, display by waveform, and dis-

play by digital. You can select a proper mode according

to the actual requirement.

Click the correct channel display frame, and select the

check box at the top right corner of each display frame.

The maximum and minimum value: the maximum and

minimum value during the measurement will be recor-

ded automatically for each channel.

Maximize the display frame of channel: Click the maxi-

mization button locating at right corner of each dis-

play frame to maximize the frame. After maximization,

clikc the restoration button locating at right corner

to restored the frame.

11.11.1 DC voltage

Measure DC voltage of vehicle components.

11.11.1.1 Equipment connection

Connect KT720 and extension line of power supply,

choose power supply mode according to battery loca-

tion of the vehicle to be tested. All connection schema-

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Measure function | KT720 | 55 en

tic diagrams therein are based on connection of battery

clip. Connect BNC end of KT720 oscilloscope probe to

CH4, then connect the other end of the black banana

plug and black alligator clip to negative pole of battery

or grounding. Different tests on functions. Connect the

other end of red banana plug and red banana socket to

DC signal to be measured.

iDC voltage on 4 vehicle components can be measu-

red simultaneously by KT720 .

11.11.1.2 Measure conditions

Start the automotive generator.

11.11.1.3 Measure steps

1. Connect the equipment; switch on power supply

ofKT720 .

2. Double click to run KT720 application.

3. Select communication mode: USB communication or

wireless communication, the KT720 and computer

are successfully connected.

4. Click Analyzer --> Multimeter.

5. Since measured value of CH1 is set as default, ple-

ase remove the CH1 and then select CH4.

6. Click “DC Voltage” button on the right to display the

value of DC voltage measured through CH4.

7. You can select display mode of measured values and

decide whether the display frame to be maximized

or not.

8. You can print the measured data.

9. Click “Pause” button to hold off the measurement.

Meanwhile, the button turns to “Start” and click it

again to carry forward the measurement.

11.11.2 AC voltage

Measure AC voltage of vehicle components.

11.11.2.1 Equipment connection

Connect KT720 and extension line of power supply,

choose power supply mode according to battery loca-

tion of the vehicle to be tested. All connection schema-

tic diagrams therein are based on connection of battery

clip. Connect BNC end ofKT720 oscilloscope probe to

CH4, then connect the other end of the black banana

plug and black alligator clip to negative pole of battery

or grounding. Different tests on functions. Connect the

other end of red banana plug and red banana socket to

AC signal to be measured.

11.11.2.2 Measure conditions

Start the automotive generator.

11.11.2.3 Measure steps

1. Connect the equipment; switch on power supply

ofKT720 .

2. Double click to run KT720 application.

3. Select communication mode: USB communication or

wireless communication, the KT720 and computer

are successfully connected.

4. Click Analyzer --> Multimeter.

5. Since measured value of CH1 is set as default, ple-

ase remove the CH1 and then select CH4.

6. Click “DC Voltage” button on the right to display the

value of DC voltage measured through CH4.

7. You can select display mode of measured values and

decide whether the display frame to be maximized

or not.

8. You can print the measured data.

9. Click “Pause” button to hold off the measurement.

Meanwhile, the button turns to “Start” and click it

again to carry forward the measurement.

11.11.3 Switch

Measure the conduction ability of vehicle components.

11.11.3.1 Equipment connection

Connect BNC end ofKT720 oscilloscope probe to CH4,

then connect the other end of the black banana plug

and black alligator clip. Then connect the other end of

red banana plug and red banana socket to switchl to be

measured.

10.11.3.2 Measure conditions

Switch off the vehicle power.

11.11.3.3 Measure steps

1. Connect the equipment; switch on power supply

ofKT720 .

2. Double click to run KT720 application.

3. Select communication mode: USB communication or

wireless communication, the KT720 and computer

are successfully connected.

4. Click Analyzer --> Multimeter.

5. Since measured value of CH1 is set as default, ple-

ase remove the CH1 and then select CH4.

6. Click “DC Voltage” button on the right to display the

value of DC voltage measured through CH4.

7. You can select display mode of measured values and

decide whether the display frame to be maximized

or not.

8. You can print the measured data.

9. Click “Pause” button to hold off the measurement.

Meanwhile, the button turns to “Start” and click it

again to carry forward the measurement.

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56 | KT720 | Measure functionen

iWhen measuring, if resistance <= 60 ohm, the buzzer

will ring.

11.11.4 Resistance

Measure resistance value of vehicle components.

11.11.4.1 Equipment connection

Connect BNC end ofKT720 oscilloscope probe to CH4,

then connect the other end of the black banana plug

and black alligator clip to negative pole of battery or

grounding. Then connect the other end of red banana

plug and red banana socket to resistance to be measu-

red.

11.11.4.2 Measure conditions

Switch off the vehicle power.

11.11.4.3 Measure steps

1. Connect the equipment; switch on power supply

ofKT720 .

2. Double click to run KT720 application.

3. Select communication mode: USB communication or

wireless communication, the KT720 and computer

are successfully connected.

4. Click Analyzer --> Multimeter.

5. Since measured value of CH1 is set as default, ple-

ase remove the CH1 and then select CH4.

6. Click “DC Voltage” button on the right to display the

value of DC voltage measured through CH4.

7. You can select display mode of measured values and

decide whether the display frame to be maximized

or not.

8. You can print the measured data.

9. Click “Pause” button to hold off the measurement.

Meanwhile, the button turns to “Start” and click it

again to carry forward the measurement.

11.11.5 Diode test

Measure diode value of vehicle components.

11.11.5.1 Equipment connection

Connect BNC end ofKT720 oscilloscope probe to CH4,

then connect the other end of the black banana plug

and black alligator clip to negative pole of battery or

grounding. Then connect the other end of red banana

plug and red banana socket to diode to be measured.

11.11.5.2 Measure conditions

Test the rectifier bridge after the generator is discon-

nected.

Diagnose the faulted generator according to methods

suggested by the manufacturer.

11.11.5.3 Measure steps

1. Connect the equipment; switch on power supply

ofKT720 .

2. Double click to run KT720 application.

3. Select communication mode: USB communication or

wireless communication, the KT720 and computer

are successfully connected.

4. Click Analyzer --> Multimeter.

5. Since measured value of CH1 is set as default, ple-

ase remove the CH1 and then select CH4.

6. Click “DC Voltage” button on the right to display the

value of DC voltage measured through CH4.

7. You can select display mode of measured values and

decide whether the display frame to be maximized

or not.

8. You can print the measured data.

9. Click “Pause” button to hold off the measurement.

Meanwhile, the button turns to “Start” and click it

again to carry forward the measurement.

11.12 Record and playback functions

KT720 can playback the data acquired, but this could

be realized only in the measuring course.

3 Kinds of files including KT720 file, freeze file and re-

cord file can be played back by KT720 .

File: waveform files saved in SD card in measuring

course.

Freeze File: waveform files saved by clicking “Frozen”

button.

Record File: waveform files saved by clicking “Record”

button in recorder interface.

Button Function and description

Playback button

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Auxiliary Function | KT720 | 57 en

Play Forward button, default play mode

Play button, click this button to replay waveform

Pause button, click this button to hang replay

Fast Forward button

Back button, back to current interface

Save button, save waveform data

Cycle: waveform data can be replayed by means of com-

pression and compression cycle must be greater than

the replay cycle: Waveform data could be compressed

to one-fifth. For instance, when the cycle of the wave-

form to be replayed is 5ms/Div, the waveform could

be compressed to 10ms/Div. This waveform could be

compressed to 250ms/Div where it reaches the highest

compression level.

Play Speed: speed when playing back the waveform

includes normal speed, speed after slowed down by 1

time, speed after slowed down by 2 times, speed after

accelerated by 1 time, speed after accelerated by 2

times.

Progress Bar: monitor playback progress, in percenta-

ge.

iIf multi-channel data are acquired, you can select

the waveform displaying channel according to your

preference.

iWaveform parameter can be displayed during play-

back.

12. Auxiliary Function

12.1 Screen shot

Catch the current window information, the system will

save it to your selected path with format of .JPG, you

just need to enter a available name of this file.

Operate Method:

1. Click "Screen Shot" button in system function

area, the system will save the file automatically; a

window pops up to display the file's save path and

name.

2. Click "OK" button to exit Screen Shot.

12.2 Help

This function is KT720's online help function, which

help you to know how to operate KT720, how to diagno-

se or measure; and this interface is individual.

Operate Method:

1. Click "help" button in system function area to

enter the help interface.

2. 2.You can figure out what you want to know accor-

ding to the left navigation column.

3. 3.You can ask for help by searching key words

through "find" button.

iYou can put some contents that you usually view

in favorites, which will convenient for you to quick

search; you could print the current page.

12.3 Feedbacks

KT720 provides online feedback function to help you to

feedback any questions you meet. However, your com-

puter must connect to Internet.

Operate Method:

1. Click "feedback" button in system function

area to enter the feedback interface;

2. The system will check test path automatically, please

write vehicle and fault information correctly so that

the feedbacks can be figured out quickly and exactly.

3. All contents attached red "*" must be filled.

4. Click "submit" to submit your feedback.

13. Maintenance Help

This function is vehicle maintenance information offe-

red by Bosch for repairman reference.

14. Service and maintenance

14.1 Cleaning

It is not recommended to clean the KT720 host with the

corrosive detergent or any coarse cloth; only the soft

cloth and neutral detergent can be used.

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58 | KT720 | Warrantyen

14.2 Maintenance

RPlace the KT720 in the flat and dry place with mo-

derate temperature and less dust when the KT720 is

not used.

RDon’t place the KT720 in the place with direct sun-

light or close to the heating device.

RDon’t place the KT720 near the stove or in the place

where will be easily subjected to smoke erosion,

water entry, and oil splashing.

RDon’t disassemble the host without permission.

RIf the vehicle test is not performed for a long time,

please periodically run the KT720 host to avoid being

affected with damp.

14.3 Battery maintenance

RThe battery shall be charged when the power is

used up; the battery shall not be charged too long, 5

hours generally.

RIt is prohibited to put the instrument in the vehicle

with high temperature when using.

RBe sure to used battery of Bosch supply.

RDo not heat the battery or drop it in the fire.

RThe battery shall be kept away from water. Keep the

anode and cathode of the battery dry.

RDo not distort, dismantle or refit the battery.

RDo not attempt to peel or cut off the battery

housing.

RDo not drop or knock the battery, or collide the bat-

tery in other ways.

RDo not put the battery at extremely warm or humid

place.

RIf the battery duration is obviously shortened after

correct charging, it means that the effective life time

of the battery is over, replace it.

15. Warranty

RWarranty period of the KT720 is twelve (12) months

dating from the day of user’s registration. Warranty

period of accessories is six (6) months dating from

the day of registration.

RIf the KT720 breaks down within the warranty period

under normal operation, the Company will provide

maintenance service free of charge.

If the KT720 breaks down in any of the following cases,

the Company will charge the material costs or other

expenses as appropriate:

$Breakdown caused by misuse or accident.

$Breakdown caused by dismantling or repairing

without authorization.

$The accessories damage or get worn naturally;

$Breakdown caused by natural disasters and force

majeure.

RWarranty service is limited to the equipment; the

Company is not liable to damages go beyond the

equipment.

16. Device parameters

16.1 Device parameters

Item Index

Size 227*134*44(mm)

Weight Approximately 760g

POWER ≤30W

WORKING TEMPERA-

TURE

-10~45°C

STORAGE TEMPERA-

TURE

-15~50°C

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Device parameters | KT720 | 59 en

Item Index

RELATIVE HUMIDITY 10%~95%

INPUT VOLTAGE DC 7~32V

USB USB2.0 FULL SPEED

KEY RECORDER KEY

LED 3 LED INDICATOR LAMPS INDICATING

THE WORKING STATUS

WLAN COMPATIBILITY IEEE 802.11B/G/N

PROTECTION GRADE IP30

BATTERY(OPTIONAL) 2200MAH

SD CARD ≤32GB

HOOK LOADING CAPACITY: 5KG

16.2 Oscillograph parameters

Item Index

Sampling channels 4 channels

Bandwidth DC~2MHz

Sampling rate 40MS/s

Memory depth 64Kbyte/CH

*Vertical scope 20mVDIV~20V/DIV

Level of collection 1uSec~50Sec/Div

Electric level reference With hardware adjustable(0~100%)

*) You can only measured 100VDC or ±50VAC singles when you

connectedKT720 differential probes.

16.3 Multimeter parameters

Item Index

AC voltage 30VAC

DC voltage 60VDC

Diodes 0~2.0V

Resistance 0~60MΩ

Switching 0~60Ω

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60 | KT720 | Safety instructionsen

Bosch Automotive Products (Nanjing) Co., Ltd

No.1 Runbo Road, East Zone of Nanjing Economic and

Technological Development Zone, Nanjing, Jiangsu

210034

China

400 000 5109

www.bosch-diagnostics.com.cn

1 697 021 785 | 2015-05-20

Bosch Automotive Service Solutions KT720 Automotive Diagnostics Equipment User Manual KT720 EN part 2

Bosch Automotive Service Solutions (Suzhou) Co., Ltd Shenzhen Branch Automotive Diagnostics Equipment KT720 EN part 2

Contents

KT720 EN User Manual -part 2

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