Subaru IMPREZA GD 2007 Series Manual page 2037

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Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
EB:DTC P2096 POST CATALYST FUEL TRIM SYSTEM TOO LEAN BANK 1
1. OUTLINE OF DIAGNOSIS
Detect the fuel system malfunction judging whether the sub feedback compensation amount shifts to rich or
lean.
Judge as compensation amount shortage when the sub feedback compensation amount shifts to rich or lean
from the engine start till the ignition OFF. →If shortage is detected, change the sub feed back compensation
amount guard value and the shift judgement line, and increment the guard operation counter (temporary NG
counter).
Judge as NG when the guard operation counter (temporary NG counter) exceeds the predetermined value,
and when the sub feedback compensation amount shifts to rich or lean.
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 at a constant 75 km/h (47 MPH) or higher.
(1)
(2)
(A) Electromotive force
(B) Air fuel ratio
(C) Rich
Enable Conditions
1 second or more
Completed
GD(H4DOTC)-246
(E)
(A)
(C) (B)
(D) Lean
(E) Theoretical air fuel ratio
(F) Comparative voltage
(F)
(D)
EN-01696