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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 512 (Engine Controls/Fuel - 5.3L, 6.0L, 6.2L - DTC P0010 To DTC P0358) >> Diagnostic Information and Procedures >> DTC P0030, P0036, P0050, P0053, P0054, P0056, P0059, P0060, P0135, P0141, P0155, or P0161 >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition OFF, disconnect the harness connector at the appropriate B52 HO2S.
  2. Ignition ON, verify that a test lamp illuminates between the ignition voltage circuit terminal D and ground.
    • If the test lamp does not illuminate, test the ignition voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B52 HO2S heater circuit fuse is open, test all components connected to the fuse and replace as necessary.
  3. Probe the appropriate control circuit terminal listed below with a test lamp connected to B+. Verify that the test lamp does not illuminate.
    • B52 HO2S 1 terminal C
    • B52 HO2S 2 terminal C
    • If the test lamp illuminates, test the control circuit for a short to ground. If the circuit tests normal, replace the K20 ECM.
  4. Engine idling, the test lamp should illuminate, or flash.
    • If the test lamp does not illuminate, or flash, test the control circuit for a short to voltage, or an open/high resistance. If the circuit/connections test normal, replace the K20 ECM.
    5. NOTE:
    • Less than 10 Ω on the ignition voltage circuit, or control circuit may set a DTC. If there is resistance on a circuit the driver will remain ON and the scan tool will display greater than 0.00 amp.
    • Performing this test may set additional DTCs.
  5. Ignition OFF, connect a 10 A fused jumper wire between the control circuit terminal listed below and the ignition voltage circuit terminal D.
    • B52 HO2S 1 terminal C
    • B52 HO2S 2 terminal C
  6. Engine idling, observe the appropriate B52 HO2S Heater parameter. The scan tool should display 0.00 A.
    • If greater than the specified value, test the control circuit and the ignition voltage circuit for high resistance.
  7. If all circuits test normal, test or replace the appropriate B52 HO2S.
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