Checking Components
For variable valve timing control to operate correctly the engine oil must be at the correct level, of the correct quality and not contaminated.
Check the engine oil level and quality. Check for contaminants in particular.
If the 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 for the timing belt
- Faulty camshaft reset valve (the slide in the valve has stuck).
HINT: First try adjusting the basic setting of the camshaft. Then read off the camshaft discrepancy at idle speed after carrying out the quick test. The value must be between -8° and +8°. If the value is incorrect when the basic setting of the camshaft is correct, try cleaning the camshaft reset valve.
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
- To adjust the camshaft position (CMP), see VVT UNIT
- see VVT SOLENOID
- Continue
Refer to VERIFICATION