Circuit Description

The Camshaft Position (CMP) actuator system enables the PCM to change the intake camshaft timing while engine is running. The CMP actuator valve controls the advance or retard of camshaft. The CMP sensor monitors the camshaft position or the camshaft angle, and compares that position or phase to the Crankshaft Position (CKP) sensor signal. PCM determines whether camshaft angle is correct by comparing the actual camshaft position to the target camshaft position. By continuously analyzing input of CMP sensor and CKP sensor, PCM can detect a failure in CMP actuator system.

DTC will set with engine running, ECT greater than 158°F (70°C), vehicle speed greater than 5 mph. and PCM detects an unexpected deviation in relationship of the input signals of the CMP sensor and the CKP sensor for 20 seconds or greater.