Toyota P1600 Users Manual

p1600 to the manual a0b5c66d-714b-46f9-b1ee-a94247b689f9

2015-01-26

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DI–133
DIAGNOSTICS

–

ENGINE
DI38N–03

DTC

P1600

ECM BATT Malfunction

CIRCUIT DESCRIPTION
Battery positive voltage is supplied to terminal BATT of the ECM even when the ignition switch is OFF for
use by the DTC memory and air–fuel ratio adaptive control value memory, etc.
DTC No.
P1600

DTC Detecting Condition

Trouble Area
S Open in back up power source circuit
S ECM

Open in back up power source circuit

HINT:
If DTC P1600 appear, the ECM does not store another DTC.

WIRING DIAGRAM

ECM
Engine Room J/B
B–R

1
2A

EFI

8
2F

W

1
E2

BATT

FL Main

Battery

A05723

INSPECTION PROCEDURE
HINT:
Read freeze frame data using TOYOTA hand–held tester or OBD II scan tool. Because freeze frame records
the engine conditions when the malfunction is detected, when troubleshooting it is useful for determining
whether the vehicle was running or stopped, the engine warmed up or not, the air–fuel ratio lean or rich, etc.
at the time of the malfunction.

2000 CELICA (RM744U)

DI–134
DIAGNOSTICS

1

–

ENGINE

Check voltage between terminal BATT of ECM connector and body ground.
ON

BATT (+)

A09084

PREPARATION:
Remove the ECM cover.
CHECK:
Measure voltage between terminal BATT of the ECM connector
and body ground.
OK:
Voltage 9 – 14 V
OK

A09092

Check and replace ECM (See page IN–30).

NG

2

Check EFI fuse.
PREPARATION:
Remove the EFI fuse from the engine room J/B.
CHECK:
Check continuity of EFI fuse.
OK:
Continuity

Engine Room J/B

NG
I11732

EFI Fuse

A11409

OK

Check and repair harness or connector
between battery and EFI fuse and ECM
(See page IN–30).

2000 CELICA (RM744U)

Check for short in all the harness and
components connected to EFI fuse.
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