Check Engine Malfunction Indicator Light (Mil) - Open Circuit

P0650

Check Engine Malfunction Indicator Light (MIL) - Open Circuit

Function
The Check Engine MIL lights up when a fault affecting emissions is stored in the DME control module.
The Check Engine MIL flashes when misfiring damaging to the TWC occurs.

Diagnosis conditions
- Engine running
- Battery voltage greater than 7 V

P0650:

Wiring Diagram







Diagnosis Procedure

Open circuit







Below limit







Above limit







1 Check wiring from DME control module, pin IV/31, to instrument cluster for continuity.
1. Connect special tool 9637 to wiring harness (DME control module connector).
2. Remove connector X 2/3.
3. Connect ohmmeter to special tool 9637, pin IV/31, and to X 2/3 on pin side, pin 11.
Display: 0 - 5 ohms

If infinity ohms is displayed, check wiring harness for chafing and pinching damage.

4. Remove connector III of instrument cluster.
5. Connect ohmmeter to X 2/3, sleeve side, and to connector III of instrument cluster, pin 2.
Display: 0 - 5 ohms

If infinity ohms is displayed, check wiring harness for chafing and pinching damage.

2 Check wiring from DME control module, pin IV/31, to instrument cluster for short to ground.
1. Connect special tool 9637 to wiring harness (DME control module connector).
2. Remove connector III of instrument cluster.
3. Connect ohmmeter to special tool 9637, pin IV/31, and ground.
Display: infinity ohms

If 0 - 5 ohms is displayed, check wiring harness for chafing and pinching damage.

3 Check wiring from DME control module, pin IV/31, to instrument cluster for short to B+.
1. Connect special tool 9637 to wiring harness (DME control module connector).
2. Remove connector III of instrument cluster.
3. Switch on the ignition.
4. Connect voltmeter to special tool 9637, pin IV/31, and ground.
Display: 0 V

If battery voltage is displayed, check wiring harness for chafing and pinching damage.