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Home >> Suzuki >> 2008 >> Swift + >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 1.6L - DTC P0016 To DTC P0315 >> DTC P0131, P0132, P0134, P0137, P0138, or P0140 >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the applicable HO2S.
  2. Ignition OFF, test for less than 5 ohms of resistance between the low reference circuit and ground.
    • HO2S 2 (Euro IV) low reference circuit terminal 3
    • HO2S 2 (Non Euro IV) low reference circuit terminal 1
    • If greater than the specified range, test the low reference circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.
  3. Engine running, verify the applicable HO2S parameter is between 350-500 mV.
    • If less than the specified range, test the signal circuit for a short to ground. If the circuit tests normal, replace the ECM.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  4. Install a 3A fused jumper wire between the signal circuit and the low reference circuit. Engine running, verify the scan tool HO2S parameter is less than 60 mV.
    • HO2S 2 (Euro IV) low reference circuit terminal 3
    • HO2S 2 (Non Euro IV) low reference circuit terminal 1
    • HO2S 2 (Euro IV) signal circuit terminal 1
    • HO2S 2 (Non Euro IV) signal circuit terminal 2
    • If greater than the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  5. Verify none of the following conditions exist:
    • If you find any of the above conditions, repair as necessary.
  6. If all circuits test normal, test or replace the applicable HO2S.
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