The function diagram for the CMP sensor includes the following:
• CMP sensor
• Electronic Control Module (ECM)
• Injector Drive Module (IDM)
• Fuel Injector
• ENGINE lamp (amber)
The CMP sensor provides the ECM with a signal that indicates camshaft position. As the cam rotates, the sensor identifies the position of the cam by locating a peg on the cam. The CMP is installed in the front cover, above and to the right of the water pump pulley.
Camshaft speed is calculated from the frequency of the CMP sensor signal. Diagnostic information on the CMP input signal is obtained by performing accuracy checks on signal levels, frequency, and duty cycle with software strategies.
NOTE: The short CMP sensor, used with International® DT 466, DT 570, and HT 570 diesel engines, is the Crankshaft Position (CKP) sensor used with other International® diesel engines.
