Mitsubishi Electric Lancer Evolution-VII Workshop Manual page 1219

13A-82
Inspection Procedure 22
Engine-ECU power supply, engine control relay, ignition
switch-IG1 system
When the ignition switch ON signal is input to the engine-ECU, the engine-ECU
turns the engine control relay ON.
This starts the supply of the battery voltage to the engine-ECU, sensor and
actuator.
Check the battery. (Refer to GROUP 54 - Battery.)
OK
Check the following connector: B-11X
OK
Check the engine control relay. (Refer to P.13A-132.)
OK
Measure at the B-11X engine control
relay connector.
D Remove the relay, and measure
at the connector side.
D Voltage between terminal No. 2
and earth
D Voltage between terminal No. 1
and earth
OK: System voltage
OK
Measure at the C-126 engine-ECU
connector.
D Measure the engine-ECU terminal
voltage.
D Ignition switch: ON
D Voltage between terminal No. 12
and earth
D Voltage between terminal No. 25
and earth
OK: System voltage
NG
To the next page
MPI -
Troubleshooting
NG
NG
NG
NG
Check the following connector: A-13
Check the harness between the
battery and engine control relay.
D Check for disconnection and
short-circuit of the power cable.
OK
Check and repair the following
connector: C-126
Probable cause
D Ignition switch malfunction
D Engine control relay malfunction
D Engine-ECU malfunction
Replace the battery.
Repair
Replace the engine control relay.
NG
OK
NG
Repair
Repair