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 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:

• the timing belt is incorrectly seated
• incorrect base setting of the timing belt
• faulty camshaft reset valve (the slide in the valve has stuck).

HINT: First try adjusting the basic set up of the camshaft. Then read off the adaptation value for the camshaft at idle speed with the engine 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. 

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 defective variable valve timing unit. The variable valve timing unit may be defective if the above fault tracing and corrective action does not remedy the fault. 

Other information: 

• To clean the camshaft reset valve, see VVT solenoid, inspection and cleaning
• To adjust the camshaft position (CMP), see Camshaft seal/variable valve timing (VVT) unit, replacing
• To replace the camshaft reset valve, see Variable Valve Timing Solenoid, Replacing .

• Continue 

  Refer to Verification