Mitsubishi MOTORS Space Runner 1999 Workshop Manual Supplement page 524

INSPECTION PROCEDURE 27
Ignition switch-ST system
The ignition switch-ST inputs a HIGH signal to the engine-ECU while the engine
is cranking.
The engine-ECU controls fuel injection, etc. during starting based on this input.
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: 8V or more
2. Continuity between 91 and earth
OK: Continuity
OK
NG
Check the following
connector: B-31
OK
Check trouble symptom.
NG
Replace the engine-ECU.
INSPECTION PROCEDURE 28
Power steering fluid pressure switch system
The presence or absence of power steering load is input to the engine-ECU.
The engine-ECU controls the idle speed control (ISC) servo based on this input.
Check the power steering fluid pressure switch.
(Refer to GROUP 37A – On-vehicle Service.)
OK
Measure at the power steering fluid pressure switch connector
A-38.
Disconnect the connector, and measure at the harness side.
Voltage between 1 and earth (Ignition switch: ON)
OK: System voltage
OK
NG
Check the following
connector: A-38
OK
Check trouble symptom.
NG
Replace the engine-ECU.
MPI –
Troubleshooting
1. NG
2. NG
Repair
NG
NG
Repair
Probable cause
Malfunction of ignition switch
Improper connector
short-circuited harness wire
Malfunction of the engine-ECU
NG
Check the following
connectors: A-74, B-18
OK
Check trouble symptom.
NG
NG
Check harness wire be-
tween the engine-ECU
and ignition switch con-
nector.
OK
Check the ignition switch.
(Refer to GROUP 54 – Ignition Switch and Immobilizer system.)
Check the harness wire between engine-ECU connector (terminal
No. 91) and earth, and repair if necessary.
Probable cause
Malfunction of power steering fluid pressure switch
Improper connector
short-circuited harness wire
Malfunction of the engine-ECU
Replace
NG
Check the following
connectors: A-23, B-29
OK
Check trouble symptom.
NG
NG
Check harness wire be-
tween engine-ECU and
power steering fluid pres-
sure switch connector.
OK
Replace the engine-ECU.
13B-43
contact, open circuit or
Repair
Repair
contact, open circuit or
Repair
Repair