| 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
Crankshaft Position (CKP) sensor is a pick-up coil mounted next to crankshaft pulley. A 34-tooth signal plate is mounted to crankshaft. DTC P0335 is set if no cranking signal is received by ECM from sensor. DTC P1335 is set if no engine running signal is received by ECM from CKP sensor. Possible causes are
- CKP sensor circuit is open or shorted.
- Defective CKP sensor.
- Defective signal.
- Defective ECM.
Diagnostic Aids
Using scan tool, read FREEZE FRAME data. Freeze frame data records engine conditions when malfunction is detected.