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Home >> Hummer >> 2007 >> H3 Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 3.7L - DTC P0013 To DTC P0171 >> DTC P0030, P0036, P0135 or P0141 >> Circuit/System Verification
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Circuit/System Verification

  1. Allow the engine to reach operating temperature. With the engine running, observe the HO2S Heater parameter with a scan tool. The value should vary from below 2 A to above 1 A.
  2. With the engine running at operating temperature, observe the HO2S Heater parameter with a scan tool and manipulate the related wiring and connectors.
    • If manipulation does affect the parameter, repair the harness or connector.
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