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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls And Fuel - 2.0L (LTG) - DTC P0335 To DTC P2635 And Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> DTC P05CC or P05CE: Cold Start Camshaft Position System >> Circuit/System Testing

Circuit/System Testing

  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 5Ω between the low reference circuit terminal 2 or B and ground.
    • If 5Ω or greater 
    1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module.
    2. Test for less than 2Ω in the low reference circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, replace the K20 Engine Control Module.
    • If less than 5Ω 
  3. Ignition ON.
    4. NOTE:

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

  4. Verify that a test lamp does not illuminate between the control circuit terminal 1 or A 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 1V between the control circuit and ground.
    • If 1V or greater, repair the short to voltage on the circuit.
    • If less than 1V, replace the K20 Engine Control Module.
    • If the test lamp does not illuminate 
  5. Remove the test lamp.
  6. Ignition ON.
  7. Verify the scan tool Camshaft Position Actuator Solenoid Valve Control Circuit Low Voltage Test Status changes between OK and Not Run when commanding the Camshaft Position Actuator Solenoid Valve On and Off.
    • If the parameter does not change 
    1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module.
    2. Test for less than 2Ω in the control circuit end to end.
      • If 2Ω or greater, repair the open/high resistance or short to ground in the circuit.
      • If less than 2Ω, replace the K20 Engine Control Module.
    • If the parameter changes 
    8. NOTE:

    If debris is found on Q6 Camshaft Position Actuator Solenoid Valve screens, clean the screens and reinspect for damage. If the screens are not damaged, reinstall in the engine.

  9. Ignition OFF, remove the Q6 Camshaft Position Actuator Solenoid Valve.
  10. Verify the following conditions do not exist:
    • Damaged, restricted, or missing screens on the Q6 Camshaft Position Actuator Solenoid Valve.
    • Surface damage or an engine oil leak between the oil sealing lands of the Q6 Camshaft Position Actuator Solenoid Valve.
    • Oil seepage at the Q6 Camshaft Position Actuator Solenoid Valve connector.
    • If a condition is found. 

      Replace the Q6 Camshaft Position Actuator Solenoid Valve.

    • If a condition is not found 
    11. NOTE:

    After exchanging the solenoids, install jumper wires to the appropriate terminal s of the harness connectors and the solenoids.

  11. Ignition OFF, exchange the suspect Q6 Camshaft Position Actuator Solenoid Valve with the Q6 Camshaft Position Actuator Solenoid Valve that is operating correctly.
  12. Engine Running.
  13. 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°.
    • If 2° or greater 

      Replace the mechanical camshaft position actuator.

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