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Home >> Infiniti >> 2011 >> G25 Base >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System - DTCS P1211 To P2A03 - G25 Sedan >> DTC P2A00, P2A03: A/F Sensor 1 >> DTC Logic >> DTC Detection Logic

DTC Detection Logic

To judge the malfunction, the A/F signal computed by ECM from the A/F sensor 1 signal is monitored not to be shifted to LEAN side or RICH side.

DTC DETECTION LOGIC CHART

DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P2A00 Air fuel ratio (A/F) sensor 1 (bank 1) circuit range/performance
  • The output voltage computed by ECM from the A/F sensor 1 signal is shifted to the lean side for a specified period.
  • The A/F signal computed by ECM from the A/F sensor 1 signal is shifted to the rich side for a specified period.
  • A/F sensor 1
  • A/F sensor 1 heater
  • Fuel pressure
  • Fuel injector
  • Intake air leaks
P2A03 Air fuel ratio (A/F) sensor 1 (bank 2) circuit range/performance
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