Checking The Status

Fig 1: Engine Start Verification

Courtesy of VOLVO CARS OF NORTH AMERICA.

Start the engine and run it to operating temperature and then let it run at idle speed
Read off the angle of the camshaft (actual value) and the its desired angle (target value).
At idle speed with the engine at operating temperature, check that the camshaft shift angle (actual value) and the desired value correspond with an accuracy of approximately 8° CA. Rev the engine a few times and check again at idle speed that the values correspond.

HINT: If this check is carried out during a road test under load, the results will be clearer because camshaft control will be more active.

The difference between the values can be read off in the lower digital display.

The fault is permanent if the values do not correspond. The fault is intermittent if the values correspond.

Fig 2: Identifying VCT2000 Diagnostic Tool Symbol In VIDA
Courtesy of VOLVO CARS OF NORTH AMERICA.