DTC Detection Logic

To judge the malfunction, the 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 LOGIC CHART

DTC No.	Trouble diagnosis name	DTC detecting condition	Possible Cause
P2A00	Air fuel ratio (A/F) sensor 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