FUEL SYSTEM <4D5-step
III
> -
Troubleshooting
13-31
INSPECTION PROCEDURE 3
Immediately after the ignition switch is “ON”, the engine
warning lamp does not turn on.
Probable cause
The engine-ECU turns on the engine warning lamp for 5 seconds immediately
after turning on the ignition switch to check the bulb for being blown.
If the engine warning lamp does not turn on immediately after turning the ignition
switch ON, problems shown in the right could exist.
D
The engine warning lamp blown
D
The engine warning lamp circuit inoperative
D
Engine-ECU inoperative
NG
Replace the engine-ECU.
NG
Check and repair the harness
between the combination meter and
the engine-ECU connector.
NG
Check and repair the engine warning
lamp power supply circuit.
OK
Check the trouble symptoms.
OK
Measure at C-05 combination meter
connector.
D
Disconnect the connector and
measure at the harness side.
D
Voltage between 38 and the
earth (Ignition switch: ON)
OK:
System voltage
OK
Check the following connectors:
C-12, C-24, C-41
NG
Repair
NG
Check bulb for being blown.
OK
Check the trouble symptoms.
OK
Measure at C-41 engine-ECU
connector.
D
Disconnect the connector and
measure at the harness side.
D
Short circuit between 8 and the
earth (Ignition switch: ON)
OK:
The engine warning lamp turns
on.
OK
Check the following connector:
C-41
NG
Repair
MUT-
II
Data list
11 Engine-ECU power supply voltage
(Refer to P.13-43.)
NG
The engine-ECU power supply and
the earth circuit check (Refer to
P.13-39, Inspection procedure 21.)
INSPECTION PROCEDURE 4
The engine warning lamp keeps on and does not turn
off.
Probable cause
The probable causes can be found in either the engine-ECU detecting the
malfunction in the sensor and/or the actuator, or the problem shown in the right
takes place.
D
Short circuit at the harness between the engine
warning lamp and the engine-ECU
D
Engine-ECU inoperative
Check the following connector:
C-24
NO
Measure at C-12 combination meter connector.
D
Disconnect the connector and measure at the harness
side.
D
Disconnect the engine-ECU connector C-41.
D
Continuity between 55 and the earth
OK:
No continuity
NG
Check and repair the harness between the combination meter
and the engine-ECU connector.
OK
MUT-
II
Self-Diag code
Is a diagnosis code output?
YES
Inspection chart for diagnosis codes (Refer to P.13-9.)
Check the trouble symptoms.
OK
Replace the engine-ECU.
NG
NG
Repair