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).

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.

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: 

• See VVT solenoid, inspection and cleaning
• To adjust the camshaft position (CMP), see: Camshaft seal/variable valve timing (VVT) unit, replacing
• See Variable valve timing solenoid, replacing

Fig 1: Identifying VCT2000 Diagnostic Tool Symbol In VIDA

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Identifying Camshaft Position Angle

Courtesy of VOLVO CARS OF NORTH AMERICA.

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  Refer to Verification