Mitsubishi FUEL Manual page 286

13I-92
INSPECTION PROCEDURE 28
Ignition switch-ST system
The ignition switch-ST outputs a HIGH signal to the engine-ECU <M/T> or
engine-A/T-ECU <A/T> while the engine is cranking.
The engine-ECU <M/T> or engine-A/T-ECU <A/T> uses this signal to carry out
functions such as fuel injection control during starting.
<M/T>
Measure at the engine-ECU connector
C-164.
D Disconnect the connector, and
measure at the harness side.
D Voltage between 68 and earth
(Ignition switch: START)
OK: 8 V or more
OK
Check the following connector:
C-164
OK
Check the trouble symptoms.
NG
Replace the engine-ECU.
<A/T>
Check the inhibitor switch.
D Continuity between terminal 9 and 10
(Refer to GROUP 23 - On-vehicle Service)
Measure at the inhibitor switch connector B-72.
D Disconnect the connector, and measure at the harness side.
D Voltage between 10 and earth (Ignition switch: START)
OK: System voltage
Measure at the engine-A/T-ECU connector C-176.
D Disconnect the connector, and measure at the harness side.
D Voltage between 58 and earth
(Selector lever position: P or N)
(Ignition switch: START)
OK: System voltage
OK
Check the following connector: C-176
Check the trouble symptoms.
Replace the engine-A/T-ECU.
GDI -
NG
Check the following connector:
C-92
Check the trouble symptoms.
NG
Repair
OK
OK
NG
Repair
OK
NG
Troubleshooting
Probable cause
D Malfunction of the ignition switch
D Malfunction of the inhibitor switch <A/T>
D Open circuit or short-circuited harness wire of the
ignition switch circuit
D Malfunction of the engine-ECU <M/T>
D Malfunction of the engine-A/T-ECU <A/T>
NG
OK
NG
NG
Replace
NG
Check the following connector: C-92
Check the trouble symptoms.
Check the harness wire between the inhibitor switch and the ignition
switch.
Check the ignition switch.
(Refer to GROUP 54 - Ignition Switch.)
NG
Check the following connector: B-72
Check the trouble symptoms.
Check the harness wire between the inhibitor switch and the
engine-A/T-ECU, repair if necessary.
Repair
Check the harness wire between the
engine-ECU and the ignition switch.
NG
OK
Repair
Check the ignition switch. (Refer to
GROUP 54.)
OK
NG
Repair
NG
NG
OK
Repair
OK
NG
Repair
NG