Mitsubishi FUEL Manual page 171

INSPECTION PROCEDURE 27
Power supply system and ignition switch-IG system
When an ignition switch ON signal is input to the engine-ECU, the engine-ECU turns
the control relay ON. This causes battery voltage to be supplied to the engine-ECU,
injectors and air flow sensor.
Check the control relay. (Refer to P.13A-193*.)
Measure at the 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 power supply and earth circuit.
(Refer to P.13A-170, INSPECTION PROCEDURE 26.)
NOTE:
*: Refer to the '97 GALANT Workshop Manual (Pub. No. PWDE9611)
MPI <6A1> -
OK
OK
Troubleshooting
Probable cause
D Malfunction of the ignition switch
D Malfunction of the control relay
D Improper
short-circuited harness wire
D Disconnected engine-ECU earth wire
D Malfunction of the engine-ECU
NG
Replace
NG
Check the following
connector: B-30
OK
Check trouble symptom.
NG
Checktheharnesswirebetweenbatteryandcontrolrelayconnector,
and repair if necessary.
13A-171
connector contact, open circuit
NG
Repair
or