Mitsubishi MOTORS Space Runner 1998, Workshop Manual

Page: 182 / 1164

GDI <4G6> -
Troubleshooting
13A-64
INSPECTION PROCEDURE 23
Engine-ECU power supply and earth circuit system Probable cause
The cause is probably a malfunction of the engine-ECU or one of the problems
listed at right.
D Open circuit or short-circuited harness wire in the
engine-ECU power supply circuit
D Open circuit or short-circuited harness wire in the
engine-ECU earth circuit
D Malfunction of the engine-ECU
NG
Repair
OK
Check the ignition switch. (Refer to
GROUP 54.)
(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 nec-
essary.
(5) NG NG
Repair
OK
Check the trouble symptoms.
NG
Check the harness wire between the
engine-ECU and the battery, and repair
if necessary.
NG
Repair
NG
Replace the engine-ECU.
OK
Check the trouble symptoms.
OK
Check the following connectors:
B-51, B-53, B-54
Check the following connectors:
B-14, B-44, B-66, B-90, B-103
OK
Check the trouble symptoms.
NG
Check the harness wire between the
engine-ECU and ignition switch, and re-
pair if necessary.
Measure at the engine-ECU connectors
B-51, B-53, B-54.
D 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
(1) NG
Check the following connector:
B-28, B-89, B-103
NG
Repair