| CAUTION | If ECM replacement is instructed in following testing, always ensure ECM harness connector and ground circuit are okay. If either are suspect, repair and repeat testing to confirm ECM malfunction. If ECM is replaced, ECM must be programmed with proper ignition key code for engine immobilizer system. For programming procedures, see COMPUTER RELEARN PROCEDURES - IMPORT article in GENERAL INFORMATION. |
Circuit Description
The CMP sensor consist of a 3-tooth signal plate and a pick-up coil. Signal plate is mounted on camshaft. DTC is set when no camshaft position signal is received by ECM from CMP sensor during cranking. DTC is also set when no camshaft position signal is received by ECM from CMP sensor with engine speed of 600 RPM or more. Possible causes are
- CMP sensor open or short circuit.
- Faulty CMP sensor.
- Faulty ECM.
Diagnostic Aids
Using scan tool, read freeze frame data. Freeze frame records engine conditions when malfunction is detected.