Subaru IMPREZA GD 2007 Series Manual page 2309

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Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
DV:DTC P2096 POST CATALYST FUEL TRIM SYSTEM TOO LEAN BANK 1
1. OUTLINE OF DIAGNOSIS
Detect the malfunction of fuel system from the amount of sub feedback control.
Sub feedback learning control is being performed and when the learning value goes to the lean side, judge
as NG.
2. COMPONENT DESCRIPTION
(3)
V
(2)
(1) Atmosphere
(2) Exhaust gas
(3) Electromotive force
3. ENABLE CONDITION
Secondary Parameters
Continuous time when the following con-
ditions are established
Conditions for carrying out the sub feed-
back learning
4. GENERAL DRIVING CYCLE
Perform the diagnosis continuously at a constant speed of 50 — 100 km/h (31 — 62 MPH).
5. DIAGNOSTIC METHOD
Judge as NG when the continuous time with the following criteria established is 5 seconds or more. Judge
as OK when the continuous time with the following criteria not established is 5 seconds or more.
Judgment Value
Malfunction Criteria
Sub feedback learning value
Time Needed for Diagnosis: 5 seconds × 1 time
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in two continuous driving
cycles.
6. DTC CLEAR CONDITION
• When the OK idling cycle is completed 40 times in a row
• When "Clear Memory" is performed
(1)
(2)
(A) Electromotive force
(B) Air fuel ratio
(C) Rich
Enable Conditions
1 second or more
Completed
Threshold Value
≤ –0.044
GD(STI)-242
(E)
(A)
(C) (B)
(D) Lean
(E) Theoretical air fuel ratio
(F) Comparative voltage
(F)
(D)
EN-01696