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Home >> Suzuki >> 2007 >> Swift + >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls & Fuel - 1.6L - DTC P0016 To P0317 >> DTC P0031, P0032, P0037, or P0038 >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the appropriate HO2S.
  2. Ignition ON, verify that a test lamp illuminates between the ignition 1 voltage circuit and ground.
    • If the test lamp does not illuminate, test the ignition 1 voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition 1 voltage circuit fuse is open, test all components connected to the ignition 1 voltage circuit and replace as necessary.
  3. Ignition OFF, connect a test lamp between the control circuit and B+.
  4. Ignition ON, command the HO2S heater ON and OFF with a scan tool. The test lamp should turn ON and OFF.
    • If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit/connections test normal, replace the ECM.
    • If the test lamp is always ON, test the control circuit for a short to ground. If the circuit/connections test normal, replace the ECM.
  5. If all circuits/connections test normal, test or replace the HO2S sensor.
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