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DTC P2096 POST CATALYST FUEL TRIM SYSTEM TOO LEAN BANK 1

DTC P2096 POST CATALYST FUEL TRIM SYSTEM TOO LEAN 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 lean 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 of 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

≤ −0.02



Time Needed for Diagnosis: 5 seconds ×1 time

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving 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)