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Home >> Infiniti >> 2021 >> Q50 Pure, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (DTCS) (2 Of 6) >> Engine (ECM) >> P015B A/F Sensor 1 >> DTC Description >> VR30DDTT engine >> 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.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

P015B

A/F SENSOR1 (B1)

(O2 sensor delayed response - lean to rich bank 1 sensor 1)

The response time of a A/F sensor 1 signal delays more than the specified time computed by ECM.
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