1.13.2.1 Monitoring Function - Crankshaft Camshaft Synchronization

P0018 

The diagnosis is performed at every edge of the selected camshaft signal and at the reference gap of the CKP sensor signal. The distance (in crankshaft degrees) between events is compared to the stored camshaft signal pattern. For each signal edge, the distance must fit the designed position in the pattern, plus/minus a tolerance. The tolerance is expanded by the range of the variable valve timing when the camshaft is not in lock position.

The following malfunctions are detected:

• for synchronization selected CMP sensor signal not valid P0018

With every event, the monitor eliminates the edges from the list of all the six cam edges, which are not inside the pattern. When a calibrated number of camshaft signal edges are detected and the list of remaining signal edges contains at least one edge, the camshaft signal is valid for synchronization. When no edge is left in the list, synchronization has failed and is re-started. When a calibrated number of synchronizations fail, the error is delivered to the error management. When synchronization fails with the intake camshaft, the same procedure is then started with another camshaft.