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Home >> Hummer >> 2008 >> H3 Alpha >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 5.3L - DTC P0335 To DTC P2138 >> DTC P0685 or P0690 >> Circuit/System Verification
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Circuit/System Verification

  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 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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