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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector of the appropriate HO2S.
  2. Ignition ON, verify the scan tool HO2S parameter is between 350-500 mV.
    • If greater than 500 mV, test the signal circuit of the HO2S sensor for a short to the heater circuit. If the circuit/connections test normal, replace the ECM.
  3. If all circuits/connections test normal, replace the applicable HO2S.
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