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Home >> Buick >> 2008 >> Allure CXL >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 7 (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 variant/trim than selected.
  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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