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Home >> Buick >> 2007 >> Allure CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 64 (Engine Control System & Fuel System - 3.6L - DTC P0008 To DTC P0333) >> DTC P0011, P0014, P0021, or P0024 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the appropriate camshaft position (CMP) actuator solenoid.
  2. Ignition ON, load test for B+ between the ignition voltage circuit terminal 1 and ground.
    • If less than the specified range, repair the ignition voltage circuit for an open/high resistance.
    3. IMPORTANT: Use a test lamp that measures greater than 20 ohms for this test.
  3. Connect a test lamp between the control circuit terminal 2 and B+.
  4. Command the appropriate CMP actuator solenoid ON and OFF with a scan tool. The test lamp should respond to the scan tool commands.
    • If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the ECM.
    • If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.
    5. IMPORTANT: The voltage must be measured at the control side of the circuit.
  5. Command the appropriate CMP actuator solenoid ON with a scan tool. Test for less than 1 volt between the probe of the test lamp and the ECM housing.
    • If greater than the specified value, test the control circuit for a high resistance. If the circuit/connections test normal, replace the ECM.
  6. Remove the CMP actuator solenoid. Inspect the CMP actuator solenoid and mounting area for the following conditions:
    • For a torn, restricted, mispositioned, or missing screens at the CMP actuator solenoid
    • For engine oil leaks between the oil sealing lands of the CMP actuator solenoid-Inspect the lands of the CMP actuator solenoid for nicks.
    • For oil seepage at the CMP actuator solenoid connector
    • If a condition is found, replace CMP actuator solenoid.
  7. Ignition OFF, swap the suspected CMP actuator solenoid with a CMP actuator solenoid that is operating correctly.
  8. Engine idling, command the suspected camshaft actuator from 0 degrees to 40 degrees and back to zero while observing the appropriate CMP Angle Variance parameters, with a scan tool. The CMP Angle Variance should be less than 2 degrees in each of the commanded states.
    • If the CMP Angle Variance is greater than 2 degrees, replace the camshaft position (CMP) actuator.
  9. If all circuits/connections test normal, test or replace the CMP actuator solenoid.
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