Mitsubishi MOTORS Space Runner 1999 Workshop Manual Supplement page 425

13A-66
INSPECTION PROCEDURE 26
Engine control relay and ignition switch-IG system
When the ignition switch ON signal is input to the engine-ECU, the
engine-ECU turns on the engine control relay.
This causes system voltage to be supplied to the engine-ECU and to the
sensors and actuators.
Check the engine control relay. (Refer
to P.13A-105.)
OK
Measure at the engine control relay
connector B-26.
Disconnect the connector, and
measure at the harness side.
Voltage between 3, 4 and earth
OK: System voltage
OK
Check the engine-ECU power supply
and earth circuit system. (Refer to
P.13A-65, INSPECTION PROCE-
DURE 25.)
INSPECTION PROCEDURE 27
Ignition switch-ST system
The ignition switch-ST outputs a HIGH signal to the engine-ECU while the
engine is cranking.
The engine-ECU uses this signal to carry out functions such as fuel injection
control during starting.
Measure at the engine-ECU connector
B-31.
Disconnect the connector, and
measure at the harness side.
(1) Voltage between 71 and earth
(Ignition switch: START)
OK: 8 V or more
(2) Continuity between 91 and earth
OK: Continuity
OK
Check the following connector:
B-31
OK
Check the trouble symptoms.
NG
Replace the engine-ECU.
GDI –
Troubleshooting
NG
Replace
NG
Check the following connector:
A-23
Check the trouble symptoms.
(1) NG
Check the following connectors:
A-75, B-18
Check the trouble symptoms.
(2) NG
Check the harness wire between the
engine-ECU connector
No.91) and earth, and repair if neces-
sary.
NG
Repair
Probable cause
Malfunction of the ignition switch
Malfunction of the engine control relay
Open circuit or short-circuited harness wire of the
engine control relay circuit
Malfunction of the engine-ECU
NG
OK
NG
Probable cause
Malfunction of the ignition switch
Open circuit or short-circuited harness wire of the
ignition switch circuit
Malfunction of the engine-ECU
NG
OK
NG
(terminal
Repair
Check the harness wire between the
battery and the engine control relay,
and repair if necessary.
Repair
Check the harness wire between the
engine-ECU and the ignition switch.
OK
NG
Repair
Check the ignition switch. (Refer to
GROUP 54.)