Mitsubishi MOTORS Space Runner 1998, Workshop Manual

Page: 300 / 1164

GDI <4G9> -
Troubleshooting
13B-58
INSPECTION PROCEDURE 31
Power steering fluid pressure switch system Probable cause
This switch inputs the amount of power steering load to the engine-ECU.
The engine-ECU uses this input to control the idle speed control servo so that
the idle speed is increased when the power steering is operating.
D Malfunction of the power steering fluid pressure
switch
D Open circuit or short-circuited harness wire in the
power steering fluid pressure switch circuit
D Malfunction of the engine-ECU
NG
Repair
OK
Check the trouble symptoms.
NG
Replace the engine-ECU.
OK
Check the following connector:
A-96
NG
Repair
OK
Check the trouble symptoms.
NG
Check the harness wire between the
engine-ECU and the power steering fluid
pressure switch.
OK
Measure at the power steering fluid
pressure switch connector A-96.
D Disconnect the connector, and
measure at the harness side.
D Voltage between 1 and earth
(Ignition switch: ON)
OK:
System voltage
NG
Check the following connector:
B-53
NG
Repair
Check the power steering fluid pressure
switch. (Refer to GROUP 37A - On-ve-
hicle Service.)
NG
Replace
INSPECTION PROCEDURE 32
A/C switch and A/C relay system Probable cause
When an A/C ON signal is input to the engine-ECU, the engine-ECU controls
the idle speed control servo to increase the idle speed, and also operates the
A/C compressor magnetic clutch.
D Malfunction of the A/C control system
D Malfunction of the A/C switch
D Open circuit or short-circuited harness wire in the
A/C switch circuit
D Malfunction of the engine-ECU
OK
Check the trouble symptoms.
NG
Replace the engine-ECU.
NG
Check A/C system. (Refer to GROUP
55 - On-vehicle Service.)
OK
Measure at the engine-ECU connectors
B-53, B-54.
D Disconnect the connector, and
measure at the harness side.
D Voltage between 8, 45 and earth
Ignition switch: ON
A/C switch: ON
OK:
System voltage
D Short circuit between 8 and earth
Ignition switch: ON
A/C switch: ON
OK:
A/C compressor clutch
turns on.
OK
Check the following connectors:
B-53, B-54
NG
Repair
Check A/C compressor relay. (Refer to
GROUP 55 - On-vehicle Service.)
NG
Replace