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Home >> Nissan-Datsun >> 2008 >> Quest Base >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System - DTCS P1211 Through P2A03 >> DTC P2A00, P2A03 A/F Sensor 1 >> On Board Diagnosis Logic

On Board Diagnosis Logic

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

DTC DETECTING CONDITION AND POSSIBLE CAUSE

DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P2A00
2A00
(Bank 1)		 Air fuel ratio (A/F) sensor 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.
  • Air fuel ratio (A/F) sensor 1
  • Air fuel ratio (A/F) sensor 1 heater
  • Fuel pressure
  • Fuel injector
  • Intake air leaks
P2A03
2A03
(Bank 2)
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