Engine Control System

DIAGNOSIS:
- The starter switch signal is abnormal.
- The harness connector between ECM and starter switch is in short or open.

TROUBLE SYMPTOM:
- Failure of engine to start

1. CHECK OPERATION OF STARTER MOTOR.
Turn ignition switch to "ST" to ensure that starter motor functions.




2. CHECK INPUT SIGNAL FOR ECM.
Measure voltage between ECM and body while cranking the engine.

Connector & terminal / Specified voltage:
(E29) No.12 - Body / 8 - 13 V




3. CHECK HARNESS CONNECTOR BETWEEN ECM AND STARTER MOTOR.
1. Turn ignition switch to OFF.
2. Disconnect connectors from ECM and starter motor.




3. Measure resistance of harness connector between ECM and starter motor.

Connector & terminal / Specified resistance:
(E29) No.12 - (B10) No.1 / 10 Ohm

4. Measure resistance of harness connector between starter motor and body to make sure that circuit does not short.

Connector & terminal / Specified resistance:
(B10) No.1 - Body / 1 MOhm, min.