Alliant Power Camshaft Position (CMP) Sensor

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Circuit Functions:

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 senor 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 the CMP input signal is obtained by carrying out accuracy checks o signal levels, frequency, and Duty cycle with software strategies. The powertrain control module (PCM) requires a crankshaft position (CKP) sensor and the 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 does not operate without a CMP signal.

Detection/Management:

An inactive CMP signal during cranking id detectable by the PCM. An inactive CMP signal causes a no-start condition. Electrical noise can also be detected by the PCM. If the level is sufficient to affect engine operation, a corresponding diagnostic trouble code (DTC) is set.

DTC Descritptions:

• P0340 = CMP Sensor Circuit Malfunction
• P0341 = CMP Sensor Circuit Performance
• P2614 = Camshaft Postion Out