P1691

P1691
Malfunction Indication Light Circuit - Open
Malfunction Indication light (MIL), Check engine - Interruption

P1692
Malfunction Indication Light Circuit - Short to Ground
MIL Check engine - Below lower limit

P1693
Malfunction Indication Light Circuit - Short to B +
MIL Check engine - upper limit exceeded

Function
The MIL Check engine is on when a fault is recorded in memory of the Engine Control Module (ECM).

Diagnostic conditions
A fault is recognized and recorded when the engine speed is above 80 1/min and the battery voltage is between 7.5 Volt and 17 Volt.





Wiring Diagram.

Diagnostic procedure.





DTC P1691.





DTC P1692.





DTC P1693.

Check wiring from ECM to instrument cluster for continuity.
1. Remove ECM connector.
2. Remove X 4/2 connector.
3. Connect ohmmeter to ECM connector, pin 8 and to connector X 4/2 on pin side, pin 8.

- Specified value: 0 - 5 ohms
- If meter reads infinite resistance
- Check wiring harness for chafing or pinching damage.

4. Remove connector II at instrument cluster.
5. Connect ohmmeter to X 4/2 cavity side and connector II of instrument cluster, pin 6.

- Specified value: 0 - 5 ohms
- If reader reads infinite resistance, check wiring harness for chafing or pinching damage.

Check wiring from ECM to instrument cluster for short circuit to ground.
1. Remove ECM connector.
2. Remove connector II for instrument cluster.
3. Connect ohmmeter to ECM connector, pin 8 and ground.

- Specified value: infinite resistance
- If reader reads 0 - 5 ohms,check wiring harness for chafing or pinching damage.

Check wiring from ECM to instrument cluster for short circuit to B+.
1. Remove ECM connector.
2. Remove connector II at instrument cluster.
3. Switch ignition on.
4. Connect voltmeter to ECM connector, pin 8 and ground.

- Specified value: 0 Volt
- If meter reads battery voltage, check wiring harness for chafing or pinching damage.