Camshaft Position Sensor
The CMP s are located in the camshaft carriers and are secured with a screw. Both CMP s extend into the camshaft carriers and are sealed with o-ring seals. When the reluctor ring is repeatedly moved over the CMP s, a voltage gets created by the CMP s. The CMP s measure the magnetic field variation induced by the reluctor ring. The CMP s are Hall effect sensors which produce a square wave signal, the frequency of which is proportional to engine speed.
The CMP has a 3-pin connector.
The 3-pin connector provides the following connections:
- A 5V reference voltage from the PCM .
- A CMP signal to the PCM .
- A ground connection.
The PCM uses the signal from the CMP s and the CKP to determine current intake and exhaust camshaft position and camshaft adjustment.
If a fault occurs with any of the CMP s, a DTC is registered in the PCM .
There are 2 types of failure that can occur:
- Camshaft signal frequency too high.
- Total failure of the camshaft signal.
The DTC recorded by the PCM can also relate to a total failure of the crankshaft signal or crankshaft signal dynamically implausible. Both components should be checked to determine the cause of the fault.
If a fault occurs with any of the CMP s when the engine is running, the engine continues to run. When the engine is switched off, the engine cranks and restarts while the fault is present, but VCT control is disabled.