FUEL SYSTEM <4D5-step
III
> -
Troubleshooting
13-39
INSPECTION PROCEDURE 21
Engine-ECU power supply and earth circuit check
(5) NG
Check the trouble symptoms.
NG
Repair
(2), (3) NG
OK
Check the trouble symptoms.
OK
NG
Check the harness between the
engine-ECU and the ignition switch.
Ignition switch check
(4) NG
Check and repair the harness
between the engine-ECU and the
earth.
OK
Check the following connectors:
C-41, C-42, C-43
NG
Replace the engine-ECU.
OK
Check the trouble symptoms.
Repair
NG
NG
Repair
Check the following connectors:
C-126
NG
Check and repair the harness
between the engine-ECU and the
control relay connector.
Check and repair the harness
between the engine-ECU and the
battery.
Check the following connectors:
C-26, C-61
NG
Repair
Measure at C-41, C-42, C-43
engine-ECU connectors.
D
Disconnect the connector and
measure at the harness side.
(1) Voltage between 82 and the
earth (Ignition switch: ON)
OK:
System voltage
(2) Voltage between 46 and the
earth
OK:
System voltage
(3) Voltage between 12, 25 and the
earth (Ignition switch: ON)
OK:
System voltage
(When terminal 46 is short
circuited to the
earth
)
(4) Continuity between 13, 26 and
the earth
OK
:
Continuity
(5) Voltage 80 and the earth
OK:
System voltage
(1) NG
OK
OK
NG
Repair
Check the trouble symptoms.
Check the following connectors:
C-24, C-110, C-103, A-19X, C-101
NG
INSPECTION PROCEDURE 22
Fuel cut solenoid valve circuit inspection
NG
Check the harness between the
engine-ECU and the fuel cut
solenoid valve connector.
OK
Replace the engine-ECU.
OK
Check the fuel injection pump
assembly connector A-131, and
repair if necessary.
OK
Check the trouble symptoms.
OK
Measure at fuel injection pump
assembly connector A-131.
D
Disconnect the connector and
measure at the harness side.
D
Voltage between 1 and the earth
(Ignition switch: ON)
OK:
System voltage
NG
Check the following connector:
C-41
NG
Repair
Fuel cut solenoid valve check
(Refer to P.13-61.)
NG
Replace the injection pump.
NG
Repair