Intake Camshaft Position Actuator Park Lock Operation

WARNING: This page is about a different car, the 2017 GMC Acadia. However, it is still accessible from the selected car via links, so may be relevant.

The Intake Camshaft Position Actuator Park Lock was designed to optimize fuel consumption and emissions at engine start-up. The ECM operates the park lock actuator solenoid valve by pulse width modulation (PWM) of the solenoid coil. The intake phaser has a spring activated locking pin that locks the phaser into the designed park lock location. Fully retarded the intake phaser would be at 0 degrees and when fully advanced would be at 35 degrees. Torque generated from the rotational inertia of the engine brings the phaser from the retarded position to the locked position. An advanced assist torsion spring brings the phaser from the advanced position to the locked position. The Camshaft Position Actuator Solenoid Valve controls the oil flow that applies the pressure to advance or retard the camshafts park lock feature. It takes 150 Kpa hydraulic pressure to actuate the phaser normally. Exhaust camshafts do not have the park lock feature.