P0601

CONTROL MODULE, INTERNAL FAULT





Fault Symptoms.
CHECK ENGINE lamp (MIL) on.
Undefinable (different functions may be affected as a result of an internal memory fault/program error).

Conditions.
When the ignition is switched on, the control module's program does not coincide with that programmed by the supplier.





Diagnostic Procedure.
1. Check diagnostic trouble code generation. Carry out a final check.

Does the diagnostic trouble code recur?
YES: Continue with point 2.
NO: No steps to be taken.





2. Check the control module's connection to ground and power supply

- Remove the control module
- Check the connector, particularly for corrosion and socket slide-out.
- Check the control module's connection to ground and power supply in the connector.

Everything OK ?
YES: Refit the control module. Then continue with point 3.
NO: Repair or replace the connector or the relevant lead. Then continue with point 3.





3. Final check

- Clear the diagnostic trouble code.
- Implementation of driving cycle:
^ Drive the car at varying engine loads and rpm for 5 minutes.
- Evaluation of driving cycle:
^ Check whether the diagnostic trouble code has recurred.

Has the diagnostic trouble code recurred?
YES: Continue at "Before Replacing a Control Module". Component Tests and General Diagnostics
NO: The steps taken to rectify the fault were correct.