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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1936 (ENGINE CONTROLS AND FUEL - 3.5L - DTC P0010 TO DTC P0232)DTC P0016CIRCUIT/SYSTEM VERIFICATION
2003 Chevrolet TrailBlazer 4.2 S, 4WD

Circuit/System Verification

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Circuit/System Verification
WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
    IMPORTANT: The supply of clean pressurized engine oil to the CMP actuator is essential to CMP actuator performance.
  1. Observe the engine oil level. The engine oil level should be within operating range. Refer to Approximate Fluid Capacities (Except Hybrid) .
  2. Ensure that the vehicle has the correct engine oil and is not old, burnt or contains additives. Refer to Checking Things Under the Hood in Service and Appearance Care within the Owner's Manual.
    • If the vehicle has the incorrect engine oil, is old, burnt, or contains additives, change the oil and filter.
  3. Test the engine oil pressure for correct operation. Refer to Oil Pressure Diagnosis and Testing .
  4. Allow the engine to reach operating temperature.
  5. Set the parking brake and place the vehicle in Park for automatic, or Neutral for manual.
  6. Observe the CMP variance parameter. 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 0 degrees.
    7. IMPORTANT: The engine will run rough and may require throttle input to keep running.
  7. Command the CMP actuator to 20 degrees. The Desired CMP parameter should match the CMP Angle parameter.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.