Mitsubishi MOTORS Space Runner 1999 Workshop Manual Supplement page 120

INSPECTION PROCEDURE 34
Ignition circuit system
The engine-ECU <M/T> or engine-A/T-ECU <A/T> interrupts the ignition coil primary
current by turning the power transistor inside the engine-ECU <M/T> or engine-A/T-ECU
<A/T> ON and OFF.
Measure at the ignition coil connectors A-97, A-98.
D Disconnect the connector and measure at the harness side.
1. Voltage between 1 and earth (Ignition switch: ON)
OK: System voltage
2. Continuity between 2 and earth
OK: Continuity
OK
NG
Check the following
connectors: A-97, A-98
OK
Check trouble symptom.
INSPECTION PROCEDURE 35
Idle speed control (ISC) servo (Stepper motor) system
The engine-ECU <M/T> or engine-A/T-ECU <A/T> 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.13D-91.)
OK
Measure at the ISC servo connector A-75.
D Disconnect the connector and measure at the harness side.
D Voltage between 2 and earth, and 5 and earth (Ignition switch:
ON)
OK: System voltage
OK
Measure at the engine-ECU connector B-54 <M/T> or the
engine-A/T-ECU connector B-113 <A/T>.
D Disconnect the connector, measure at the harness side.
D Voltage between each of <M/T> 4, 5, 17, 18 <A/T> 14, 15,
28, 29 and earth (Ignition switch: ON)
OK: System voltage
OK
NG
Check the following
connector: B-54 <M/T>,
B-113 <A/T>
OK
Check trouble symptom.
MPI -
Troubleshooting
1. NG
2. NG
Repair
NG
Replace
NG
NG
Repair
NG
Probable cause
D Malfunction of ignition switch.
D Improper connector
short-circuited harness wire
D Malfunction of
engine-A/T-ECU <A/T>
NG
Check the following
connectors: B-13, B-89,
B-103
OK
Check trouble symptom.
NG
NG
Check the harness wire
between ignition coil and
ignition switch connector.
OK
Check the ignition switch.
(Refer to GROUP 54 - Ignition Switch and Immobilizer System.)
Check the harness wire between ignition coil connector and earth,
and repair if necessary.
Check ignition coil and power transistor unit system. (Refer to
P.13D-22, INSPECTION PROCEDURE FOR DIAGNOSIS CODE
44.)
Probable cause
D Malfunction of ISC servo
D Improper connector
short-circuited harness wire
D Malfunction of
engine-A/T-ECU <A/T>
Check the harness wire between control relay and ISC servo con-
nector, and repair if necessary.
NG
Check the following
connector: A-75
OK
Check trouble symptom.
NG
Check harness wire between engine-ECU <M/T> or engine-
A/T-ECU <A/T> and ISC servo connector, and repair if necessary.
Replace the engine-ECU <M/T> or engine-A/T-ECU <A/T>.
13D-55
contact, open circuit
the engine-ECU <M/T>
Repair
Repair
contact, open circuit
the engine-ECU <M/T>
Repair
or
or
or
or