| CAUTION | If ECM replacement is instructed in following testing, always ensure ECM connectors 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, or appropriate ENGINE IMMOBILIZER SYSTEMS article in ACCESSORIES & EQUIPMENT. |
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 CKP sensor signal is received by ECM during cranking or no CKP sensor signal is received by ECM with engine speed at 600 RPM or more. DTC P1335 is set if no CKP sensor signal is received by ECM with engine speed at 1000 RPM or more. Possible causes are
- CKP sensor circuit is open or shorted.
- Defective CKP sensor.
- Defective crankshaft timing pulley.
- Defective ECM.
Diagnostic Aids
Using scan tool, read FREEZE FRAME data. Freeze frame data records engine conditions when malfunction is detected.