Subaru LEGACY 2006 Manual page 648

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Diagnostic Trouble Code (DTC) Detecting Criteria
DL:DTC P2097 POST CATALYST FUEL TRIM SYSTEM TOO RICH 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 rich 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
Sub feedback learning execution condi-
tions
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 times
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cy-
cles.
(1)
(2)
(A) Electromotive force
(B) Air fuel ratio
(C) Rich
Enable Conditions
1 second or more
Completed
Threshold Value
≥ 0.038
GD(H4SO)-211
GENERAL DESCRIPTION
(E)
(A)
(C) (B)
(D) Lean
(E) Theoretical air fuel ratio
(F) Comparative voltage
(F)
(D)
EN-01696