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The Camshaft Position (CMP) sensor senses the Top Dead Center (TDC)point of the #1 cylinder in the compression stroke. The CMP sensor signalallows the Engine Control Module (ECM) to determine the fuel injector sequencestarting point.

The ECM will set P0340 and the Malfunction Indicator Lamp (MIL) willturn on if during two driving cycles there is more than one CMP sensor signalduring two engine revolutions when the engine speed is above 600 RPM. Thiscode indicates unexpected camshaft position readings by the CMP sensor orECM when the engine is rotating.