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 CHART

DTC No.	Trouble diagnosis name	DTC detecting condition	Possible Cause
P2A00 2A00	Air fuel ratio (A/F) sensor 1 circuit range/performance	The output voltage computed by ECM from the air fuel ratio (A/F) sensor 1 signal is shifted to the lean side for a specified period. The A/F signal computed by ECM from the air fuel ratio (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