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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 514 (Engine Controls/Fuel - Hybrid (LZ1) - DTC P0351 To DTC P3449 And Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P3401, P3425, P3441, or P3449 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2012 GMC Yukon, 2012 Chevrolet Tahoe, and 2012 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, open the hood to disable the Auto-Stop function. Refer to Hybrid Modes of Operation Description .
  2. Ignition ON, verify the scan tool hood position parameter displays Open.
    3. NOTE:

    DTC P3401, P3425, P3441, and P3449 sets with an open ignition circuit fuse.

  3. Ignition ON, command the appropriate cylinder deactivation solenoid ON and OFF while observing the following status parameters with a scan tool:
    • Cyl. 1, 4, 6, or 7 Deact. Sol. CKT Open Test Status
    • Cyl. 1, 4, 6, or 7 Deact. Sol. CKT Short Gnd Test Status
    • Cyl. 1, 4, 6, or 7 Deact. Sol. CKT Short Volts Test Status

      Each parameter should display OK or Not Run

  4. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
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