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Home >> Suzuki >> 2008 >> XL7 Base, AWD >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine General Information And Diagnosis >> Diagnostic Information and Procedures >> DTC P0135, P0141, P0155, or P0161 >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector of the appropriate HO2S.
  2. Ignition ON, test for B+ on the HO2S ignition voltage circuit terminal C 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 D and B+.
    • If 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, and verify the test lamp illuminates or flashes with bright intensity.
    • 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.
      NOTE: The control circuit for the HO2S heater is pulled-up to voltage within the ECM, 2.0- 3.0 volts on the control circuit is normal.
  5. Ignition ON, test for 2.0-3.0 volts between the control circuit terminal D 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 HO2S.
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