DTC P2097: Post Catalyst Fuel Trim System Too Rich Bank 1

Detect the malfunction of fuel system from the amount of sub feedback control.

Sub feedback control amount sticks to rich sides during sub feedback control.

Judge NG when the rear oxygen sensor output does not come close to target voltage (slice level).

Perform the diagnosis continuously at a constant more than approx. 80 km/h (50 MPH).

• Abnormality Judgment 

  Calculate the continuous time from the sticking of sub feedback control amount to rich side and cumulative deviation (sumdelo 2) of rear oxygen sensor voltage and target voltage.

  Judge NG when the malfunction criteria below are completed after 300 seconds have passed continuously.

  Judgment Value 

  JUDGMENT VALUE CHART
  
  

  Malfunction Criteria	Threshold Value
  sumdelo2 = sumdelo2 + (rvo2 - rsl) where:	> 1500 V
  rvo2 = sensing voltage of O2 sensor rsl = target voltage of O2 sensor

  Time Needed for Diagnosis:  300 seconds

  Malfunction Indicator Light Illumination:  Illuminates when malfunction occurs in 2 continuous drive cycles.

• 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.

• When the OK idling cycle was completed 40 times in a row
• When "Clear Memory" was performed

• When OK with similar drive in 3 drive cycles.
• When "Clear Memory" was performed

None

Memorize the freeze frame data. (For test mode $02)