DTC P1350: VARIABLE VALVE TIMING (VVT) CIRCUIT MALFUNCTION
NOTE: Variable Valve Timing (VVT) sensor is also known as camshaft position sensor.
The Variable Valve Timing (VVT) sensor consists of a signal plate and pick-up coil. The signal plates have 3 teeth and are mounted on each intake camshaft. The VVT sensor provides feedback to ECM in order to control intake valve timing. DTC P1350 is set if no VVT sensor (crank position sensor No. 1) signal to ECM during cranking at 4 seconds or more, no VVT sensor (crank position sensor No. 1) signal to ECM with 5 second or more and engine speed at 600 RPM or more, or while crankshaft rotates twice, VVT sensor (crank position sensor No. 1) signal is input to ECM 5 times. Possible causes are:
Ã Open or short in VVT sensor circuit.
Ã Faulty VVT sensor.
Ã Camshaft timing gear.
Using scan tool, read freeze frame data. Freeze frame records engine conditions when malfunction is detected.
Diagnosis & Repair
1. Disconnect suspect VVT sensor connector. Measure resistance between VVT sensor terminals. Resistance should be 835-1400 ohms at 14-122 F (-10-50 C), or 1060-1645 ohms at 122-212 F (50-100 C). Replace VVT sensor as necessary. If resistance is as specified, go to next step. 2. Check for open or short circuit in wiring harness between ECM connector and appropriate VVT sensor. See WIRING DIAGRAMS article. Repair as necessary. If wiring harness is okay, inspect VVT sensor installation. Tighten sensor as necessary. If VVT sensor is installed properly, replace ECM and retest.
Wednesday, August 6th, 2008 AT 7:04 AM