Possible Causes
NOTE: The listed causes may not be a complete list of all potential problems and there may be other causes.
- Faulty Variable Valve Timing (VVT) sensor
- Variable Valve Timing (VVT) sensor harness is open or short-circuited
- Poor electrical connection in the Variable Valve Timing (VVT) sensor circuit
- Engine Control Module (ECM)
Description
The Variable Valve Timing (VVT) sensor (VVT signal) consists of a signal plate and a detection coil. The VVT signal plate has 1 tooth on its outer circumference and is mounted on the intake camshafts. When the camshafts rotate, the protrusion of the signal plate and the air gap of the detection coil change, causing fluctuations in the magnetic field and generating an electromotive force in the detection coil. The actual camshaft angle is detected by the VVT sensor and it provides feedback to the Engine Control Module (ECM) to control the intake valve timing in response to the condition.
How to Repair
Check the “Possible Causes” listed above. Visually inspect the wiring harness and related connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
Detected
No signal from the Variable Valve Timing (VVT) sensor to the Engine Control Module (ECM) during startup for 4 seconds or more.
Possible Symptoms
- Engine light on (or engine maintenance warning light soon)