Fault-tracing

Fault-tracing

Checking the status




- Start the engine and run it to normal operating temperature
- Read off and note the adaptation value for the camshaft at idle speed. The value must be between -8° and +8°.
The fault is intermittent if the adaptation value is between -8° and +8°. The fault is permanent if the adaptation value is lower than -8° or higher than +8°.









Is the adaptation value correct?

Yes - Intermittent fault

No - Checking components

-------------------------------------------------

Checking components
For the variable valve timing control to work, the engine oil must be at the correct level, of the correct grade and free of contaminants.
Check the level and quality of the engine oil. Check for contaminants in particular.
If the adaptation value is too high (higher than +8°) when the engine is at operating temperature, the cause of the fault is probably one of the following:
- Camshaft belt incorrectly seated
- Incorrect basic setting of the timing belt
- Faulty camshaft reset valve (the slide in the valve has stuck).

Hint: Try to adjust the basic setting of the camshaft. Then read off the adaptation value for the camshaft with the engine idling and at operating temperature. The value must be between -8° and +8°. If the adaptation value is incorrect when the basic setting of the camshaft is correct, try cleaning the camshaft reset valve.

Note! The camshafts must be adjusted using the adjustment tool for the camshafts and crankshaft in the prescribed manner.

Try a new camshaft reset valve if the above fault-tracing does not solve the fault.
Remedy as necessary.

Hint: The fault can also be caused by a damaged variable valve timing unit. The variable valve timing unit may be damaged if the above fault-tracing and corrective action do not remedy the fault.

Other information:
- VVT solenoid, inspection and cleaning VVT Solenoid, Inspection and Cleaning
- To adjust the camshaft position (CMP), see: Camshaft seal/variable valve timing (VVT) unit, replacing Camshaft Seal/Variable Valve Timing (VVT) Unit, Replacing
- Variable valve timing solenoid, replacing [1][2]Removal and Replacement










Continue - Verification

-------------------------------------------------

Intermittent fault
If the diagnostic trouble code (DTC) for this fault is stored but the adaptation value is correct, the fault is intermittent. Cause of the intermittent fault is probably a damaged camshaft reset valve.

Hint: The fault can be caused by contaminants in the camshaft reset valve. Try cleaning the valve.

Other information:
- VVT solenoid, inspection and cleaning VVT Solenoid, Inspection and Cleaning
- Variable valve timing solenoid, replacing [1][2]Removal and Replacement
- To adjust the camshaft position (CMP), see: Camshaft seal/variable valve timing (VVT) unit, replacing Camshaft Seal/Variable Valve Timing (VVT) Unit, Replacing


Continue - Verification

-------------------------------------------------

Verification




Verification

Verification

Hint: After carrying out the repair, check that the fault has been remedied.




- Start the engine and run it to normal operating temperature
- Read off the camshaft adaptation at idle speed.
The adaptation value must be between -8° and +8.
The function is OK if the adaptation value is correct.





Is the function OK?

Yes - VERIFIED

No - VERIFICATION FAILED

------------------------

VERIFICATION FAILED - Fault-tracing information

VERIFIED - Fault Found

-------------------------------------------------

Fault-tracing information




Information

Fault-tracing information
The fault should have been detected and remedied. As this is not the case fault-tracing has failed.
Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

Do you want to exit fault-tracing?

Yes - FAULT-TRACING FAILED

No - Attempt New Test

------------------------

FAULT-TRACING FAILED - FAULT-TRACING FAILED

Attempt New Test - Checking the status

-------------------------------------------------