MPI <6A1> -
Troubleshooting
13A-147
INSPECTION PROCEDURE 3
The engine warning lamp does not illuminate right after
the ignition switch is turned to the ON position.
Probable cause
Because there is a burnt-out bulb, the engine-ECU causes the engine warning lamp
to illuminate for five seconds immediately after the ignition switch is turned to ON.
If the engine warning lamp does not illuminate immediately after the ignition switch
is turned to ON, one of the malfunctions listed at right has probably occurred.
D
Burnt-out bulb
D
Defective warning lamp circuit
D
Malfunction of the engine-ECU
OK
Check trouble symptom.
NG
Check the harness wire between combination meter and engine-
ECU, and repair if necessary.
OK
Check the following connectors:
D-03, C-90, C-168
NG
Repair
NG
Check the engine warning lamp power supply circuit, and repair
if necessary.
OK
Measure at the combination meter connector D-03.
D
Disconnect the connector, and measure at the harness side.
D
Voltage between 4 and earth (Ignition switch: ON)
OK:
System voltage
NG
Check a burnt-out bulb.
NG
Replace
NG
Replace the engine-ECU.
OK
Check trouble symptom.
OK
Check the following
connector:
C-168
NG
Repair
OK
Measure at the engine-ECU connector C-168.
D
Disconnect the connector, and measure at the harness side.
D
Earth the terminal No. 22.
OK:
The engine warning lamp illuminates.
MUT-
II
Data list
16 engine-ECU power supply voltage (Refer to P.13A-176.)
NG
Check the engine-ECU power supply and earth circuit.
(Refer to P.13A-170, INSPECTION PROCEDURE 26.)
INSPECTION PROCEDURE 4
The engine warning lamp remains illuminating and never
goes out.
Probable cause
In cases such as the above, the cause is probably that the engine-ECU is detecting
a problem in a sensor or actuator, or that one of the malfunctions listed at right has
occurred.
D
Short-circuit between the engine warning lamp and
engine-ECU
D
Malfunction of the engine-ECU
OK
Replace the engine-ECU.
No
Measure at the combination meter connector D-03.
D
Disconnect the connector, and measure at the harness side.
D
Disconnect the engine-ECU connector
D
Continuity between 16 and earth
OK:
No continuity
NG
Check the harness wire between combination meter and engine-
ECU connector, and repair if necessary.
MUT-
II
Self-Diag code
Are diagnosis codes displayed?
Yes
Refer to P.13A-99, INSPECTION CHART FOR DIAGNOSIS
CODES.
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