Mitsubishi MOTORS Space Runner 1999 Workshop Manual Supplement page 424

INSPECTION PROCEDURE 25
Engine-ECU power supply and earth circuit system
The cause is probably a malfunction of the engine-ECU or one of the problems
listed at right.
Measure at the engine-ECU connectors
B-28, B-29, B-31.
Disconnect the connector, and
measure at the harness side.
(1) Voltage between 82 and earth
(Ignition switch: ON)
OK: System voltage
(2) Voltage between 38 and earth
OK: System voltage
(3) Voltage between 12, 25 and
earth (Ignition switch: ON)
OK: System voltage (When ter-
minal 38 is shorted to
earth)
(4) Continuity between 13, 26 and
earth
OK: Continuity
(5) Voltage between 80 and earth
OK: System voltage
OK
Check the following connectors:
B-28, B-29, B-31
OK
NG
Repair
Check the trouble symptoms.
NG
Replace the engine-ECU.
GDI –
Troubleshooting
(1) NG
Check the following connector:
B-18
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 harness wire between the
engine-ECU and earth, and repair if
necessary.
(5) NG
Check the following connectors:
B-18, B-45
Check the trouble symptoms.
Probable cause
Open circuit or short-circuited harness wire in the
engine-ECU power supply circuit
Open circuit or short-circuited harness wire in the
engine-ECU earth circuit
Malfunction of the engine-ECU
NG
OK
NG
NG
OK
NG
13A-65
Repair
Check the harness wire between the
engine-ECU and ignition switch, and
repair if necessary.
OK
NG
Repair
Check the ignition switch. (Refer to
GROUP 54.)
Repair
Check the harness wire between the
engine-ECU and the battery, and repair
if necessary.