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DTC Detection Logic

DTC DETECTING CONDITION CHART

DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0031 Air fuel ratio (A/F) sensor 1 heater control circuit low The current amperage in the A/F sensor 1 heater circuit is out of the normal range.
(An excessively low voltage signal is sent to ECM through the A/F sensor 1 heater.)
  • Harness or connectors

    (The A/F sensor 1 heater circuit is open or shorted.)

  • A/F sensor 1 heater
P0032 Air fuel ratio (A/F) sensor 1 heater control circuit high The current amperage in the A/F sensor 1 heater circuit is out of the normal range.
(An excessively high voltage signal is sent to ECM through the A/F sensor 1 heater.)
  • Harness or connectors

    (The A/F sensor 1 heater circuit is shorted.)

  • A/F sensor 1 heater
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