Camshaft sensor: Description

The camshaft sensor signal presents one edge (rising or falling) per engine revolution. The position of these edges is known relative to crankshaft long tooth position.

A plausibility diagnosis is performed that compares camshaft (CAM) and crankshaft signals. The CAM edge must be in a defined window of crankshaft teeth in order to declare the CAM signal as valid.

If a CAM error is detected after the camshaft and crankshaft signals have synchronized the engine will remain in normal operation mode.

If insufficient time is available at engine crank (to determine the camshaft and crankshaft synchronization) for a Cam error to be detected then the correct firing cylinder cannot be determined. In this case:

The sequential fuel injection will run with a constant injection phase of 180°CRK and the engine will run open loop (in this condition there is a 50% probability of the injection starting at the correct crankshaft position). This "Limp Home" condition minimizes the impact on engine responsiveness due to excessive time periods between fuel injection and inlet valve opening.

Each ignition coil is fired every TDC.

Knock correction will take a constant default value.