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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 237 (Engine Control System & Fuel - 4.8L, 5.3L, 6.0L, Or 6.2L - Troubleshooting & Diagnosis) >> Powertrain Relay Diagnosis >> Circuit/System Verification

Circuit/System Verification

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  1. Engine running, command the powertrain relay ON and OFF, with a scan tool, while observing the following powertrain relay coil control circuit status parameters.
    • Powertrain relay coil control Ckt. Short Gnd Test Status
    • Powertrain relay coil control Ckt. Open Test Status
    • Powertrain relay coil control Ckt. Short Volts Test Status

      Each parameter should toggle between OK and Not Run or Not Run and OK

  2. Ignition ON, engine OFF, with a test lamp, probe both test points of all the fuses that are powered by the powertrain relay. The test lamp should illuminate ON for at least one test point of each fuse.
  3. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
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