Circuit Description

WARNING: This page is about a different car, the 2002 Isuzu Trooper. However, it is still accessible from the selected car via links, so may be relevant.

Camshaft position signal is produced by Camshaft Position (CMP) sensor pulses when engine is running and Crankshaft Position (CKP) sync pulses are being received. CMP and CKP sensor share 5-volt reference and ground connections at PCM. Third wire at sensor is a signal circuit to PCM. PCM uses CMP signal pulses to initiate sequential fuel injection. PCM constantly monitors number of pulses on CMP signal circuit and compares them to number of 58X pulses received. If PCM receives an incorrect number of pulses on CMP reference circuit, DTC P0342 is set and PCM will initiate injector sequence without CMP signal with a one in six chance that injector sequence is correct. Engine will continue to start and run normally, although misfire diagnostic will be affected if a misfiring condition occurs.

When DTC sets, PCM illuminates MIL on second trip after fault was detected. PCM will initiate injector sequence without CMP signal with a one in six chance that injector sequence is correct. PCM will store conditions present when DTC was set as freeze frame data in the FAILURE RECORDS data.

PCM will turn MIL off on third consecutive trip cycle during which diagnostic runs and fault is no longer recognized. A history DTC P0342 will clear after 40 consecutive trip cycles during which diagnostic runs and fault is no longer recognized. DTC can be cleared with scan tool, or by disconnecting battery voltage feed to PCM.