| CAUTION | If ECM replacement is instructed in following testing, always ensure ECM connectors and ground circuits are okay. If either are defective, 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
Camshaft Position (CMP) sensor is a pick-up coil mounted on exhaust side of cylinder head, on flywheel side of engine. A 3-tooth signal plate is mounted to left bank exhaust camshaft. DTC is set when either 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 Toyota hand-held tester or scan tool, read FREEZE FRAME data. Freeze frame data records engine conditions when malfunction is detected.