| 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
The Variable Valve Timing (VVT) sensor is a camshaft position sensor mounted at center of each cylinder head, underneath intake manifold. VVT sensor consists of a signal plate and pick-up coil. Signal plate has one tooth and is mounted on intake camshafts. VVT sensor provides feedback to ECM in order to control intake valve timing. DTC is set when ECM does not sense VVT sensor signal during cranking for 4 or more seconds. DTC is also set when ECM does not sense VVT sensor signal with engine speed at 600 RPM or more for 5 or more seconds. DTC is also set when ECM sees 5 VVT sensor inputs during 2 rotations of crankshaft. DTC P1345 is for bank No. 1 (left cylinder head). DTC P1350 is for bank No. 2 (right cylinder head). Possible causes are
- Open or short in VVT sensor circuit.
- Faulty VVT sensor.
- Faulty ECM.
Diagnostic Aids
Using scan tool, read freeze frame data. Freeze frame records engine conditions when malfunction is detected.