LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Buick >> 2004 >> Rainier 5.3 P, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 2 (Engine Control System - 4.2L (Introduction)) >> Description and Operation >> Camshaft Actuator System Description >> CMP Actuator System Performance Diagnostics
April 5, 2026: LEMON Manuals is launched! Read the announcement.

CMP Actuator System Performance Diagnostics

WARNING: This page is about a different variant/trim than selected.

The PCM monitors the performance of the CMP Actuator system by monitoring the actual and desired positions of a cam phaser. If the difference between the actual and desired position is more than a calibrated angle for more than a calibrated amount of time, a DTC will set.