DTC P0014 CIRCUIT DESCRIPTION The cam phasing system is a hydraulically actuated phase shifting mechanism. The powertrain control module (PCM) supplies the ignition positive driver and ground circuits. A pulse width modulated (PWM) driver controls the amount that the camshaft actuator solenoid assembly advances or retards the exhaust camshaft. The exhaust camshaft is commanded to a maximum retard position of 25 degrees . When the exhaust camshaft is retarded at the maximum rate, the duty cycle of the signal is at 100 percent . The maximum advance rate has a 0 percent duty cycle. Other than when the camshaft is at full advance, a 50 percent duty cycle is used to maintain a steady retard angle. If the desired and actual cam phase angle error exceeds its tolerance value for a certain amount of time, then DTC P0014 will set.