Circuit Functions

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The CMP signal source is a magnetic pickup sensor mounted on the left front side of the engine block. The sensor reacts to a peg on a target wheel that is positioned on the camshaft. The peg passes the sensor once per camshaft revolution and produces a single pulse correspondingly. The camshaft speed is calculated from the frequency of the CMP sensor signal. Diagnostic information on the CMP input signal is obtained by carrying out accuracy checks on signal levels, frequency, and duty cycle with software strategies.

The powertrain control module (PCM) requires a crankshaft position (CKP) sensor and CMP signal to calculate engine speed and piston position. The CMP sensor creates a signal that the PCM uses to indicate the left or right bank. The engine will not operate without a CMP signal.