Circuit Description
WARNING: This page is about a different car, the 2003 Lexus SC 430. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Camshaft position sensor may also be referred to as VVT sensor.
VVT sensor (VVL or VVR signal) consists of a magnet, iron core and pickup coil. VVL or VVR signal plate has 3 teeth on its outer circumference and is installed on the intake camshaft. When camshafts rotate, the protrusion on the signal plate and the air gap on the pickup coil change, causing fluctuations in the magnetic field and generating an electromotive force in the pickup coil. The actual camshaft angle is detected by the VVT sensor and it provides feedback to the ECM to control the intake valve timing in response to the driving condition. VVT sensor is sometimes referred to as Camshaft Position (CMP) sensor. See Fig 1. DTC will set if no signal is detected. Possible causes are:
- Open or short in VVT sensor circuit.
- Faulty VVT sensor.
- Faulty ECM.