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P0601,P0604

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

P0601 , P0604

Control module, internal fault

Fault symptoms

The CHECK ENGINE lamp (MIL) is on. Undefinable (different functions may be affected, depending on the internal memory fault 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, proceed to point 3.


no

Rectify the fault. Continue with point 3.


3. Final check



- Clear the diagnostic trouble code.

- Implementation of driving cycle:

- Evaluation of driving cycle:


Has the diagnostic trouble code recurred?

yes

Continue as described in .


no

The steps taken to rectify the fault were correct.