Mitsubishi FUEL Manual page 283

INSPECTION PROCEDURE 25
Engine-ECU (engine-A/T-ECU) power supply and earth
circuit system
The cause is probably a malfunction of the engine-ECU <M/T> or
engine-A/T-ECU <A/T> or one of the problems listed at right.
<M/T>
Measure at the engine-ECU connectors
C-163, C-164.
D Disconnect the connector, and
measure at the harness side.
(1) Voltage between 99 and earth
(Ignition switch: ON)
OK: System voltage
(2) Voltage between 57 and earth
OK: System voltage
(3) Voltage between 47, 59 and
earth (Ignition switch: ON)
OK: System voltage (When ter-
minal 57 is shorted to
earth)
(4) Continuity between 46, 58 and
earth
OK: Continuity
(5) Voltage between 60 and earth
OK: System voltage
OK
Check the following connectors:
C-163, C-164
NG
OK
Repair
Check the trouble symptoms.
NG
Replace the engine-ECU.
GDI -
Troubleshooting
(1) NG
Check the following connectors:
C-92, C-131
Check the trouble symptoms.
(2), (3) NG
Check the harness wire between the
engine-ECU and engine control relay,
and repair if necessary.
(4) NG
Check the following connector:
C-45
Check the trouble symptoms.
Check the harness wire between the
engine-ECU and earth, andrepair if nec-
essary.
Check the following connectors:
(5) NG
(C-48, C-63, C-66, C-83, C-132,
C-141) <LHD>, (C-14, C-62, C-66,
C-83) <RHD>
Check the trouble symptoms.
Probable cause
D Open circuit or short-circuited harness wire in the
engine-ECU <M/T> or engine-A/T-ECU <A/T>
power supply circuit
D Open circuit or short-circuited harness wire in the
engine-ECU <M/T> or engine-A/T-ECU <A/T> earth
circuit
D Malfunction of the engine-ECU <M/T>
D Malfunction of the engine-A/T-ECU <A/T>
NG
OK
NG
NG
OK
NG
NG
OK
NG
13I-89
Repair
Check the harness wire between the
engine-ECU and ignition switch, and re-
pair if necessary.
OK
NG
Repair
Check the ignition switch. (Refer to
GROUP 54.)
Repair
Repair
Check the harness wire between the
engine-ECU and the battery, and repair
if necessary.