Description And Operation: Operation

Courtesy of CHRYSLER GROUP, LLC

Variable Valve Timing Solenoid (VVT) 

• Camshaft phaser position is adjusted using regulated oil pressure through an Oil Control Valve (OCV).
• To begin Phaser movement, the Powertrain Control Module (PCM) applies a pulse-width modulated voltage signal to the VVT solenoid to extend or retract the solenoid pintle.
• The pintle pushes against an internal spool valve within the OCV moving the valve forwards and backwards to direct oil flow.
• The position of the spool inside the OCV determines which ports and chambers inside the phaser are being fed, either to advance the timing of the phaser sprocket relative to the camshaft, retard it, or hold a desired position. Refer to ASSEMBLY, VARIABLE VALVE TIMING, PHASER / OIL CONTROL VALVE, DESCRIPTION AND OPERATION .
• The Camshaft Position (CMP) sensor monitors the position of the camshaft with respect to the crankshaft and provides feedback to the PCM.

The debris crush mode will only occur with the key on and the engine off (KOEO). If the ignition is cycled to the start position without a momentary pause (immediate crank), the debris crush mode will not occur. In this instance the procedure will be performed at the next key off cycle.