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Circuit/System Verification

WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.
  1. Operate the vehicle at idle and at various engine speeds and load ranges while observing the CMP Variance, Desired CMP and CMP Angle parameters with a scan tool.
  2. All three parameters should remain less than or equal to 1 degree at idle. The CMP Variance should remain less than or equal to 1 degree unless the CMP actuator is being commanded. If the CMP actuator is moved, the CMP Variance will rise for 1-2 seconds until the CMP Angle parameter matches the Desired CMP parameter. The CMP Variance should again return to less than or equal to 1 degree.
    • If the CMP Variance remains more than 1 degree for more than 3 seconds, continue with the Circuit/System Testing.
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