P2097

DTC P2097 - POST CATALYST FUEL TRIM SYSTEM TOO RICH BANK 1

OUTLINE OF DIAGNOSIS
Detect the malfunction of fuel system from the amount of sub feedback control.
Judge NG when the rear oxygen sensor output does not approach to the slice level (target voltage) with the control amount sticks to rich or lean side while operating the sub feedback control.




COMPONENT DESCRIPTION




ENABLE CONDITION

GENERAL DRIVING CYCLE
Perform the diagnosis continuously at a constant 80 km/h (50 MPH).

DIAGNOSTIC METHOD




- Abnormality Judgment
Calculate the continuous time from the sticking of sub feedback control amount to rich or lean side and cumulative deviation (sumdelo 2) of rear oxygen sensor voltage and slice level (target voltage).
Judge NG when the malfunction criteria are completed after 300 seconds have passed continuously.

- Normality Judgment
Judge OK and clear the NG when the rear oxygen output is reversed, and during 4 seconds after that, the sub feedback control amount does not stick to rich or lean sides.

DTC CLEAR CONDITION
- When the OK idling cycle was completed 40 times in a row
- When "Clear Memory" was performed

MALFUNCTION INDICATOR LIGHT CLEAR CONDITION
- When the OK driving cycle was completed 3 times in a row
- When "Clear Memory" was performed

FAIL SAFE
None

ECM OPERATION AT DTC SETTING
Memorize the freeze frame data. (For test mode $02)