ECM Power Circuits Check
- Disconnect ECM coupler. Turn ignition switch "ON", but do not start engine. Connect voltmeter between terminal No. 2 of disconnected coupler (on wiring harness side) and body ground. See Fig 1 . Check voltage.
- Repeat voltage check for terminal Nos. 3, 9, 12, 13, 16 and 18. If measured voltage between each terminal and body is about 12 volts, each circuit is in good condition.
- Check clutch switch operation as follows: Connect voltmeter between terminal No. 13 and ground. Depress clutch pedal fully. Voltage should drop to zero, indicating clutch switch is "ON" and terminal is grounded. Reconnect coupler to ECM.