Mitsubishi MOTORS Space Runner 1999 Workshop Manual Supplement page 430

INSPECTION PROCEDURE 32
Power steering fluid pressure switch system
The power steering fluid pressure switch sends a signal to the engine-ECU according
to power steering load.
Based on this signal, the engine-ECU controls the throttle control servo so that
idle speed increases when the power steering is in operation.
Check the power steering fluid pressure switch. (Refer to GROUP
37A – On-vehicle Service.)
Measure at power steering fluid pressure switch connector A-38.
Disconnect the connector, and measure at the harness side.
Voltage between terminal 1 and earth
(Ignition switch: ON)
OK: System voltage
Check the following connector: A-38
OK
Check trouble symptom.
INSPECTION PROCEDURE 33
A/C switch and A/C relay system
If the engine-ECU receives a 'A/C on' signal, it operates the throttle control servo
and A/C compressor magnetic clutch so that idle speed increases.
Service the A/C compressor relay. (Refer to GROUP 55 – On-ve-
hicle Service.)
Measure at engine-ECU connectors B-28, B-29.
Disconnect the connector, and measure at the harness side.
Voltage between terminals 8, 45 and earth
(Ignition switch: ON)
OK: 0 – 3 V
(A/C switch: OFF)
System voltage
(A/C switch: ON)
Connect terminal 8 to earth.
(Ignition switch: ON, A/C switch: ON)
OK: A/C compressor clutch turns on.
Check the A/C system. (Refer to GROUP 55 – On-vehicle Service.)
GDI –
OK
OK
NG
Repair
OK
NG
Troubleshooting
Probable cause
Malfunction of the power steering fluid pressure switch
Open circuit or short-circuited harness wire in the
power steering fluid pressure switch circuit, or poor
connector contact
Malfunction of the engine-ECU
NG
Replace
NG
Check the following connectors: A-23, B-29
OK
Check trouble symptom.
Check the harness wire between the engine-ECU and power steer-
ing fluid pressure switch.
OK
NG
Replace the engine-ECU.
Probable cause
Malfunction of the A/C control system
Malfunction of the A/C switch
Open circuit or short-circuited harness wire in the
A/C switch circuit, or poor connector contact
Malfunction of the engine-ECU
NG
Replace
OK
Check the following connectors: B-28, B-29
OK
Check trouble symptom.
Replace the engine-ECU.
13A-71
NG
Repair
NG
NG
Repair
NG
Repair
NG