Mitsubishi FUEL Manual page 69

INSPECTION PROCEDURE 27
Power supply system and ignition switch-IG system
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.
Check the engine control relay. (Refer to P.13A-90*.)
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-ECU <M/T> or engine-A/T-ECU <A/T> power
supply and earth circuit.
(Refer to P.13A-68, INSPECTION PROCEDURE 26.)
NOTE:
*: Refer to the '97 GALANT Workshop Manual (Pub. No. PWDE9611)
INSPECTION PROCEDURE 28
Fuel pump system
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.
MPI <4G6> -
OK
OK
Troubleshooting
Probable cause
D Malfunction of the ignition switch
D Malfunction of the engine control relay
D Improper
short-circuited harness wire
D Disconnected engine-ECU <M/T> or engine-A/T-ECU
<A/T> earth wire
D Malfunction
engine-A/T-ECU <A/T>
NG
Replace
NG
Check the following
connector: B-30
OK
Check trouble symptom.
NG
Check the harness wire between battery and engine control relay
connector, and repair if necessary.
Probable cause
D Malfunction of the fuel pump relay
D Malfunction of the fuel pump
D Improper
short-circuited harness wire
D Malfunction
engine-A/T-ECU <A/T>
13A-69
connector contact, open circuit
of the engine-ECU <M/T>
NG
Repair
connector contact, open circuit
of the engine-ECU <M/T>
or
or
or
or