Circuit Description

A signal rotor rotates with camshaft, and passes through the magnetic field of the Camshaft Position (CMP) sensor. A fluctuating magnetic field is generated when signal rotor passes CMP sensor. As a result, a reference voltage is induced in CMP sensor. This ignition reference signal is sent to PCM. PCM uses these pulses as reference signals identifying cylinders and performing misfire diagnosis. CMP sensor is located in cylinder head, near ignition coil No. 2.

When DTC sets, MIL will illuminate. PCM will record operating conditions at time of diagnostic failure and store information in FREEZE FRAME/FAILURE RECORDS data buffer.