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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 364 (Engine Controls And Fuel - 5.3L, 6.0L & 6.2L - DTC P0443 Through DTC P3449 And Troubleshooting) >> Diagnostic Information and Procedures >> DTC P3401, P3425, P3441, or P3449 >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition OFF, remove the intake manifold. Refer to Intake Manifold Replacement (RPOs LC9, LMG, LY5, L76) , Intake Manifold Replacement (RPOs LY2, LY6) , Intake Manifold Replacement (Except RPOs LY2, LY6, LC9, LMG, LY5) .
  2. Disconnect the harness connector at the valve lifter oil manifold assembly.
  3. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal E and ground.
    • If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition circuit fuse is open, test all the components connected to the ignition circuit and replace as necessary.
  4. Verify that a test lamp does not illuminate between the ignition circuit terminal E and the appropriate cylinder deactivation solenoid control circuit terminal listed below.
    • Cylinder deactivation solenoid valve 1 terminal C
    • Cylinder deactivation solenoid valve 2 terminal A
    • Cylinder deactivation solenoid valve 3 terminal B
    • Cylinder deactivation solenoid valve 4 terminal D
    • If the test lamp illuminates, test the control circuit for a short to ground. If the circuit tests normal, replace the ECM.
  5. Verify that a test lamp does not illuminate between ground and the appropriate cylinder deactivation solenoid control circuit terminal listed below.
    • Cylinder deactivation solenoid valve 1 terminal C
    • Cylinder deactivation solenoid valve 2 terminal A
    • Cylinder deactivation solenoid valve 3 terminal B
    • Cylinder deactivation solenoid valve 4 terminal D
    • If the test lamp illuminates, test the control circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  6. Connect a test lamp between the ignition circuit terminal E and the appropriate cylinder deactivation solenoid control circuit terminal listed below.
    • Cylinder deactivation solenoid valve 1 terminal C
    • Cylinder deactivation solenoid valve 2 terminal A
    • Cylinder deactivation solenoid valve 3 terminal B
    • Cylinder deactivation solenoid valve 4 terminal D
  7. Command the appropriate cylinder deactivation solenoid ON with a scan tool. Verify the test lamp illuminates with each command.
    • If the test lamp does not illuminate, test the control circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  8. If all the circuits test normal, test or replace the valve lifter oil manifold assembly.
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