| CAUTION | If ECM replacement is instructed in following testing, always ensure ECM harness connector 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 article in GENERAL INFORMATION. |
Circuit Description
Note. Variable Valve Timing (VVT) sensor is also known as Camshaft Position (CMP) sensor.
Vehicle is equipped with 2 VVT sensors. Each VVT sensor consists of a magnet, iron core and pick-up coil. One VVT sensor is mounted in outer corner of each cylinder head, just below valve cover (oil filler cap end). A 3-tooth signal plate is mounted to outer camshaft. DTC P0340 is set when no cranking signal is received by ECM from sensor. DTC P0340 is also set when no signal is received by ECM from sensor with engine speed of 600 RPM or more. Possible causes are
- Open or short in VVT sensor circuit.
- Faulty VVT sensor.
- Faulty starter.
- Faulty ECM.
Diagnostic Aids
Using scan tool, read freeze frame data. Freeze frame records engine conditions when malfunction is detected.