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DTC P2097 POST CATALYST FUEL TRIM SYSTEM TOO RICH BANK 1

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 sub feedback learning value sticks to rich sides during sub feedback learning control.

COMPONENT DESCRIPTION


(1)

Atmosphere

(A)

Electromotive force

(D)

Lean

(2)

Exhaust gas

(B)

Air fuel ratio

(E)

Theoretical air fuel ratio

(3)

Electromotive force

(C)

Rich

(F)

Comparative voltage



ENABLE CONDITION

Secondary Parameters Enable Conditions
Continuous time of completing condition below

1 second or more

Sub feedback leaning enable condition

Complete



GENERAL DRIVING CYCLE

Perform the diagnosis continuously at a constant speed 50 to 100 km/h (31 to 62 MPH).

DIAGNOSTIC METHOD

Judge NG when the continuous time of completing the malfunction criteria below becomes more than 5 seconds. Judge OK when it becomes less than 5 seconds.

Judgment Value

Malfunction Criteria Threshold Value
Sub feedback learning value

> 0.018



Time Needed for Diagnosis: 5 seconds ×1 time

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

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 OK with similar drive in 3 drive cycles.

• When “Clear Memory” was performed


FAIL SAFE

None

ECM OPERATION AT DTC SETTING

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