MPI <4G9> -
Troubleshooting
13A-148
INSPECTION PROCEDURE 26
Power supply system and ignition switch-IG system
Probable cause
When an ignition switch ON signal is input to the engine-ECU <M/T> or engine-A/T-ECU
<A/T>, the engine-ECU <M/T> or engine-A/T-ECU <A/T> turns the control relay ON.
This causes battery voltage to be supplied to the engine-ECU <M/T> or engine-A/T-ECU
<A/T>, injectors and air flow sensor.
D
Malfunction of the ignition switch
D
Malfunction of the control relay
D
Improper connector contact, open circuit or
short-circuited harness wire
D
Disconnected engine-ECU <M/T> or engine-A/T-ECU
<A/T> earth wire
D
Malfunction
of
the
engine-ECU
<M/T>
or
engine-A/T-ECU <A/T>
OK
Check the engine-ECU <M/T> or engine-A/T-ECU <A/T> power
supply and earth circuit.
(Refer to P.13A-147, INSPECTION PROCEDURE 25.)
NG
Check theharness wire between battery and control relay connector,
and repair if necessary.
OK
Check the trouble symptom.
NG
Check the following
connector:
A-10
NG
Repair
OK
Measure at the control relay connector B-13.
D
Disconnect the connector, and measure at the harness side.
D
Voltage between 3, 4 and earth
OK:
System voltage
Check the control relay. (Refer to P.13A-83*.)
NG
Replace
NOTE:
*: Refer to the ’96 COLT/LANCER Workshop Manual (Pub. No. PWME9511).
INSPECTION PROCEDURE 27
Fuel pump system
Probable cause
The engine-ECU <M/T> or engine-A/T-ECU <A/T> turns the control relay ON when
the engine is cranking or running, and this supplies power to drive the fuel pump.
D
Malfunction of the fuel pump relay
D
Malfunction of the fuel pump
D
Improper connector contact, open circuit or
short-circuited harness wire
D
Malfunction
of
the
engine-ECU
<M/T>
or
engine-A/T-ECU <A/T>
NG
Check the fuel pump relay. (Refer to
P.13A-83*.)
NG
Replace
MUT-
II
Actuator test
07 Fuel pump (Refer to P.13A-158.)
OK
Normal
OK
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