P0601

CONTROL MODULE, INTERNAL FAULT





Fault Symptoms
CHECK ENGINE lamp (MIL) on.
Undefinable (different functions may be affected, depending on the internal memory fault and/or program fault).

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