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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 P0685, P0689, P0690, or P1682 >> Circuit/System Verification

Circuit/System Verification

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, 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:
    • A short to voltage on other components may cause DTC P0690 to set. If any other DTC is set, diagnose that DTC first.
    • If you were sent here from Engine Cranks But Does Not Run, proceed to Circuit/System Testing.
  3. Ignition ON, command the EC Ignition Relay ON and OFF with a scan tool while observing the following EC Ignition Relay control circuit status parameters:
    • EC Ignition Relay Control Ckt Short Gnd Test Status
    • EC Ignition Relay Control Ckt Open Test Status
    • EC Ignition Relay Control Ckt Short Volts Test Status

      Each parameter should display OK or Not Run in each commanded state.

  4. Ignition ON, view the DTC information with a scan tool. DTC P0685, P0690, or P1682 should not set.
  5. 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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