Toyota P1600 Users Manual

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A05723

EFI

B–R 2A 2F

Engine Room J/B

WE2

FL Main

Battery

1

ECM

BATT

8

1

–DIAGNOSTICS ENGINE

DI–133

2000 CELICA (RM744U)

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. DTC Detecting Condition Trouble Area

P1600 Open in back up power source circuit

SOpen in back up power source circuit

SECM

HINT:

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

WIRING DIAGRAM

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.

DI38N–03

A09084 A09092

ON

BATT (+)

I11732 A11409

Engine Room J/B

EFI Fuse

DI–134

–DIAGNOSTICS ENGINE

2000 CELICA (RM744U)

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

PREPARATION:

Remove the ECM cover.

CHECK:

Measure voltage between terminal BATT of the ECM connector

and body ground.

OK:

Voltage 9 – 14 V

OK 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

NG Check for short in all the harness and

components connected to EFI fuse.

OK

Check and repair harness or connector

between battery and EFI fuse and ECM

(See page IN–30).