Mitsubishi FUEL User Manual

MPI <4G6> -
Troubleshooting
13A-69
INSPECTION PROCEDURE 27
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 engine 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 engine 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-68, INSPECTION PROCEDURE 26.)
NG
Check the harness wire between battery and engine control relay
connector, and repair if necessary.
OK
Check trouble symptom.
NG
Check the following
connector:
B-30
NG
Repair
OK
Measure at the engine control relay connector C-31.
D
Disconnect the connector, and measure at the harness side.
D
Voltage between 3, 4 and earth
OK:
System voltage
Check the engine control relay. (Refer to P.13A-90*.)
NG
Replace
NOTE:
*: Refer to the ’97 GALANT Workshop Manual (Pub. No. PWDE9611)
INSPECTION PROCEDURE 28
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>

Mitsubishi FUEL Specifications

General

Brand	Mitsubishi
Model	FUEL
Category	Automobile Accessories
Language	English