| CAUTION | If ECM replacement is instructed in following tests, always ensure ECM connectors and ground circuit 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
CMP sensor (G22 signal) consist of a signal plate mounted on exhaust camshaft and a pick-up coil. G22 signal plate has one tooth on its outer circumference. 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 records engine conditions when malfunction is detected.