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Home >> Chevrolet >> 2009 >> Traverse LS, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 3.6L - DTC P0008 To DTC P0191 >> DTC P0135, P0141, P0155, or P0161 >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the appropriate HO2S.
  2. Ignition ON, test for B+ on the HO2S ignition voltage circuit terminal D of the HO2S harness connector.
    • If less than the specified value, repair the ignition voltage circuit of the HO2S heater for a short to ground or an open/high resistance.
  3. Ignition OFF, connect a test lamp between the heater control circuit terminal E and B+. The test light should not illuminate.
    • If the test lamp illuminates, test the heater control circuit for a short to ground. If the circuit/connections test normal, replace the ECM.
  4. Idle the engine, verify the test lamp illuminates or flashes.
    • If the test lamp is always OFF, test the control circuit for an open/high resistance. If the circuit/connections test normal, replace the ECM.
    5. NOTE: The control circuit for the HO2S heater is pulled-up to voltage within the ECM, 2.0-3.0 V on the control circuit is normal.
  5. Ignition ON, test for 2.0-3.0 V between the control circuit terminal E and ground.
    • If not within the specified range, test the control circuit for a short to voltage. If the circuit/connections test normal, replace the ECM.
  6. If all circuits/connections test normal, test or replace the appropriate HO2S.
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