DTC Detection Logic

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

DTC DETECTION CONDITION AND POSSIBLE CAUSES REFERENCE TABLE

DTC No.	Trouble diagnosis name	DTC detecting condition	Possible cause
P2A00	A/F sensor 1 (bank 1) circuit range/performance	The output voltage computed by ECM from the A/F sensor 1 signal shifts to the lean side for a specified period. The A/F signal computed by ECM from the A/F sensor 1 signal 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	A/F sensor 1 (bank 2) circuit range/performance