Circuit Description

Camshaft Position (CMP) sensor is a magnetic generator type sensor. CMP sensor produces an alternating current signal which increases in both frequency and amplitude as engine RPM increases. CMP sensor signal, along with Crankshaft Position (CKP) sensor signal, is used by PCM to determine crankshaft speed, crankshaft position and piston stroke. Information is used by PCM to calculate fuel injection pulse, determine TDC for ignition timing and establish a starting point for ignition coil and injection sequencing. DTC P0340 will set when:

• No CMP sensor signal to PCM exists during engine cranking.
• No CMP sensor signal to PCM exists with engine speed at 600 RPM or greater.