P0601

CONTROL MODULE, INTERNAL FAULT





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

Conditions.
P0601
Software fault

P0604
Software fault





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

- Remove the control module.
- Check its connector, particularly for dislodged sockets and corrosion.
- Check the control module's connection to ground and power supply.

Everything OK?

YES:
^ Refit the control module. Continue with point 3.
NO:
^ Rectify the fault. 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.