Conditions

Internal Control Module. Malfunction.





Fault symptoms
- CHECK ENGINE.
- Incorrect idle speed.
- Cruise control inoperative.

On-Board Diagnostics

Type of diagnosis:
- Continuous. But interrupted when fault criteria fulfilled and will not restart until next driving cycle.

Enable criteria:
- Ignition in ON position.

Fault criteria:
- ROM faulty in processor 592.

Dependents:
- None.

System reaction to a fault:
- Throttle control goes into limp-home mode. The limp-home solenoid will be activated 5 times in succession each time the ignition is turned on until the fault has been rectified and the trouble codes cleared.

OK report:
- Accelerator pedal has been depressed at some time and then fully released. 120s has expired since then without fault criteria being fulfilled.

Fault handling: Fault Handling III, Other Emission-Related Comp. & Function
- CHECK ENGINE goes on immediately and can be turned off only by clearing the trouble codes.

Diagnostic help
Fault diagnosis concerns an internal fault in the control module.