Mitsubishi MOTORS Space Runner 1999 Workshop Manual Supplement page 526

INSPECTION PROCEDURE 31
Ignition circuit system
The engine-ECU interrupts the ignition coil primary current by turning the power
transistor inside the engine-ECU ON and OFF.
Measure at the distributor connector A-72.
Disconnect the connector and measure at the harness side.
1. Voltage between 1 and earth (Ignition switch: ON)
OK: System voltage
2. Continuity between 4 and earth
OK: Continuity
Check the ignition coil. (Refer to GROUP 16 – Ignition System.)
Check the power transistor unit.
(Refer to GROUP 16 – Ignition System.)
Measure at the distributor connector A-72.
Disconnect the connector, and measure st the harness side.
1. Voltage between 3 and earth (Engine: Cranking)
OK: 2 – 7 V
2. Continuity between 2 and earth
OK: No continuity
Check the following connector, and repair if necessary.
A-72
MPI –
OK
OK
OK
OK
Troubleshooting
Probable cause
Malfunction of ignition switch
Improper
short-circuited harness wire
Malfunction of the engine-ECU
1. NG
Check the following
connectors: B-18, B-58
OK
2. NG
Check trouble symptom.
NG
Check the harness wire
between distributor and
ignition switch connector.
OK
Check the ignition switch.
(Refer to GROUP 54 – Ignition Switch and Immobilizer System.)
Check the harness wire between distributor connector and earth,
and repair if necessary.
NG
Replace
NG
Replace
1. NG
Check the following
connector: B-28
OK
2. NG
Check trouble symptom.
NG
Check the harness wire
between the engine-ECU
and the distributor con-
nector.
OK
Replace the engine-ECU.
As short circuit occurs between power transistor unit and combina-
tion meter (tachmeter), check the harness, and repair if necessary.
13B-45
connector contact, open circuit
NG
Repair
NG
Repair
NG
Repair
NG
Repair
or