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Home >> Infiniti >> 2020 >> QX80 Luxe, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (DTCS) (2 Of 5) >> Engine (ECM) >> DTC P014F: A/F Sensor 1 >> DTC Description >> DTC Detection Logic
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DTC Detection Logic

To judge malfunctions, this diagnosis measures response time of the A/F signal computed by ECM from the A/F sensor 1 signal. The time is compensated by engine operating (speed and load), fuel feedback control constant, and the A/F sensor 1 temperature index. Judgment is based on whether the compensated time (the A/F signal cycling time index) is inordinately long or not.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible Cause

P014C

Air fuel ratio (A/F) sensor 1 (bank 1) circuit slow response
  • The response time of a A/F sensor 1 signal delays more than the specified time computed by ECM.
  • Harness or connectors

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

  • A/F sensor 1

P014D

P015A

Air fuel ratio (A/F) sensor 1 (bank 1) circuit delayed response

P015B

P014E

Air fuel ratio (A/F) sensor 1 (bank 2) circuit slow response

P014F

P015C

Air fuel ratio (A/F) sensor 1 (bank 2) circuit delayed response

P015D
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