Mitsubishi MOTORS Space Runner 1999 Workshop Manual Supplement page 527

13B-46
INSPECTION PROCEDURE 32
Idle speed control (ISC) servo (Stepper motor) system
The engine-ECU controls the intake air volume during idling by opening and closing
the servo valve located in the bypass air passage.
NG
Check the ISC servo
(Refer to P.13B-75.)
OK
Measure at the ISC servo connector A-67.
Disconnect the connector and measure at the harness side.
Voltage between 2 and earth, and 5 and earth
(Ignition switch: ON)
OK: System voltage
OK
Measure at the engine-ECU connector B-28.
Disconnect the connector, measure at the harness side.
Voltage between each of 4, 5, 17, 18 and earth (Ignition switch:
ON)
OK: System voltage
OK
NG
Check the following
connector: B-28
OK
Check trouble symptom.
INSPECTION PROCEDURE 33
Purge control solenoid valve system
The purge control solenoid valve controls the purging of air from the canister located
inside the intake manifold.
Check the purge control solenoid valve. (Refer to GROUP 17
– Emission Control System.)
OK
Measure at the purge control solenoid valve connector A-58.
Disconnect the connector and measure at the harness side.
Voltage between 2 and earth (Ignition switch: ON)
OK: System voltage
OK
Measure at the engine-ECU connector B-28.
Disconnect the connector and measure at the harness side.
Voltage between 9 and earth (Ignition switch: ON)
OK: System voltage
OK
NG
Check the following
connector: B-28
OK
Check trouble symptom.
NG
Replace the engine-ECU.
MPI –
Troubleshooting
Replace
NG
NG
Repair
NG
NG
NG
NG
Repair
Probable cause
Malfunction of ISC servo
Improper connector
short-circuited harness wire
Malfunction of the engine-ECU
Check the harness wire between control relay and ISC servo
connector, and repair if necessary.
NG
Check the following
connector: A-67
OK
Check trouble symptom.
NG
Check harness wire between engine-ECU and ISC servo connec-
tor, and repair if necessary.
Replace the engine-ECU.
Probable cause
Malfunction of solenoid valve
Improper connector
short-circuited harness wire.
Malfunction of the engine-ECU
Replace
Check the harness wire between control relay and solenoid valve
connector, and repair if necessary.
NG
Check the following
connector: A-58
OK
Check trouble symptom.
NG
Check the harness wire between engine-ECU and solenoid valve
connector, and repair if necessary.
contact, open circuit or
Repair
contact, open circuit or
Repair