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Home >> Chevrolet >> 2006 >> Monte Carlo LTZ >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - 3.9L - DTC P0010 To DTC P0420 >> DTC P0016 >> Circuit/System Verification
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Circuit/System Verification

  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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