Mike's Workshop Manuals: Service manuals for every vehicle
Home >> Nissan-Datsun >> 2011 >> Quest SL >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P0137 To P0448 >> DTC P014C, P014D, P014E, P014F: A/F Sensor 1 >> DTC Logic >> DTC Detection Logic

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 DETECTION CONDITION CHART

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
P014E Air fuel ratio (A/F) sensor 1 (bank 2) circuit slow response
P014F
scientia non olet · About Mike's Workshop Manuals