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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 365 (Engine Controls And Fuel - Hybrid (LZ1) - DTC P0351 Through DTC P3449 And Troubleshooting) >> Diagnostic Information and Procedures >> DTC P3401, P3425, P3441, or P3449 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2011 GMC Yukon, 2011 Chevrolet Tahoe, and 2011 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, remove the intake manifold. Refer to Intake Manifold Replacement .
  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. Remove the test lamp.
  6. Command the appropriate cylinder deactivation solenoid ON with a scan tool. Verify the scan tool Cylinder Deactivation Solenoid Valve Control Circuit High Voltage Test Status parameter displays OK.
    • If not the specified value, test the appropriate control circuit listed below for a short to voltage. If the circuit tests normal, replace the ECM.
    • 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. Install a 3 A fused jumper wire between the appropriate control circuit terminal listed below and the ignition circuit terminal E. Command the appropriate cylinder deactivation solenoid ON with a scan tool. Verify the scan tool Cylinder Deactivation Solenoid Valve Control Circuit High Voltage Test Status parameter displays Malfunction.
    • 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 not the specified value, 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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