| CAUTION | If ECM replacement is instructed in following testing, always ensure ECM connectors and ground circuits are okay. If either are suspect, repair and repeat testing to confirm ECM malfunction. |
Note. For component location, see appropriate illustration in THEORY & OPERATION article.
Circuit Description
Camshaft Position (CMP) sensor ("G" signal) consist of a signal plate and pick-up coil. "G" signal plate has one tooth on its outer circumference and is mounted on exhaust camshaft. DTC is set when no cranking or engine running signal is received by ECM from CMP sensor. Possible causes are
- CMP sensor circuit is open or shorted.
- Defective CMP sensor.
- Defective signal plate.
- Defective ECM.
Diagnostic Aids
Using scan tool, read FREEZE FRAME data. Freeze frame data records engine conditions when malfunction is detected.