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Home >> Chevrolet >> 2006 >> Cobalt LTZ >> Repair and Diagnosis >> External Pages >> Different car >> Section 778 (Engine Control System & Fuel System - 2.4L - DTC P0010 To DTC P0366) >> DTC P0016 or P0017 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2008 Pontiac G5 and 2008 Chevrolet Cobalt. 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. The CMP variance should remain less than or equal to 1 degree unless the CMP actuator is being commanded. If the CMP actuator is commanded, 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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