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Home >> Buick >> 2015 >> Verano Leather >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 6 (Engine Controls And Fuel - 2.0L (LHU) - DTC P025A To DTC P2635 Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P05CC or P05CE: Cold Start Exhaust/Intake Camshaft Position System Performance >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. Ignition Off and all vehicle systems Off, disconnect the appropriate harness connector at the Q6 Camshaft Position Actuator Solenoid Valve. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 5 Ω between the low reference circuit terminal 2 and ground.
    • If 5 Ω or greater 
    1. Ignition Off, disconnect the harness connector at the K20 Engine Control Module.
    2. Test for less than 2 Ω in the low reference circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K20 Engine Control Module.
    • If less than 5 Ω 
    3. NOTE:

    A test lamp must be used for this test. The control circuit is pulled-up to a low current voltage, 1.5-4.5 V on the control circuit is normal.

  3. Ignition On, verify that a test lamp does not illuminate between the control circuit terminal 1 and ground.
    • If the test lamp illuminates 
    1. Ignition Off, disconnect the harness connector at the K20 Engine Control Module, ignition On.
    2. Test for less than 1 V between the control circuit and ground.
    • If 1 V or greater, repair the short to voltage on the circuit.
    • If less than 1 V, replace the K20 Engine Control Module.
    • If the test lamp does not illuminate 
  4. Remove the test lamp.
  5. Ignition On, command the appropriate Q6 Camshaft Position Actuator Solenoid Valve from Off to On with a scan tool while observing the scan tool Camshaft Position Actuator Solenoid Valve Control Circuit Low Voltage Test Status. The value should toggle between OK and Not Run in each of the commanded states.
    • If the parameter does not correspond to the specified values 
    1. Ignition Off, disconnect the harness connector at the K20 Engine Control Module.
    2. Test for less than 2 Ω in the control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance or short to ground in the circuit.
      • If less than 2 Ω, replace the K20 Engine Control Module.
    • If the parameter corresponds to the specified values 
    6. NOTE:

    If debris is found on CMP screens, clean the screens and reinspect for damage. If the screens are not damaged, reinstall in the engine.

  6. Remove the Q6 Camshaft Position Actuator Solenoid Valve and verify the following conditions do not exist:
    • Torn, mis-positioned, or missing screens at the CMP actuator solenoid.
    • Engine oil leak between the oil sealing lands of the CMP actuator solenoid. Inspect the lands of the CMP actuator solenoid for nicks.
    • Oil seepage at the CMP actuator solenoid connector.
    • If a condition is found. 

      Replace the Q6 Camshaft Position Actuator Solenoid Valve.

    • If no condition is found 
    7. NOTE:

    After swapping the solenoids, install jumper wires to the appropriate terminals of the harness connectors and the solenoids.

  7. Ignition Off, swap the intake or exhaust Q6 Camshaft Position Actuator Solenoid Valve with the Q6 Camshaft Position Actuator Solenoid Valve that is operating correctly.
  8. Engine idling.
  9. Verify the scan tool Camshaft Position Variance parameter is less than 2° in each of the commanded states when commanding the Camshaft Position Actuator from 0-20° and back to 0° with a scan tool.
    • If 2° or greater 

      Replace the mechanical camshaft position actuator.

    • If less than 2° 
  10. Test or replace the Q6 Camshaft Position Actuator Solenoid Valve.
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