Camshaft Position Sensor
WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
The Hall Effect Camshaft Position (CMP) sensor produces 3 ON-OFF pulses for each revolution of the camshaft. CMP sensor is located below the water pump. See Fig 1 . The CMP output is pulse width encoded. The ECM uses the CMP sensor and Crankshaft Position (CKP) sensor output pulses to determine the engine speed and position. The CMP sensor is connected directly to the ECM by the 12-volt reference, low reference and CMP sensor signal. If ECM determines that the CMP sensor signal is out of range for less than 2 seconds, a DTC will set. To diagnose DTC, see SELF-DIAGNOSTICS - 6.6L SIERRA & SILVERADO - DIESEL article.