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Home >> Infiniti >> 2012 >> G25 Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 108 (Engine Control System - 370Z - DTC P0643 Through P2A03) >> DTC P2A00, P2A03: A/F Sensor 1 >> DTC Logic >> DTC Detection Logic

DTC Detection Logic

WARNING: This page is about a different car, the 2011 Nissan 370Z. However, it is still accessible from the selected car via links, so may be relevant.

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

DTC DETECTION LOGIC

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 shifts to the lean side for a specified period.
  • The A/F signal computed by ECM from the A/F sensor 1 signal is shifts 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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