Subaru 2009 IMPREZA Service Manual page 905

Diagnostic Trouble Code (DTC) Detecting Criteria
DH:DTC P2097 POST CATALYST FUEL TRIM SYSTEM TOO RICH (BANK 1)
1. OUTLINE OF DIAGNOSIS
Detect the malfunction of fuel system from the size of the sub feedback learning value.
Sub feedback learning is being performed. When the learning value goes to the rich side, judge as NG.
2. COMPONENT DESCRIPTION
(3)
V
(2)
(A) Electromotive force
(D) Lean
(1) Atmosphere
3. ENABLE CONDITIONS
Secondary Parameters
Conditions for carrying out the sub feed-
back learning
Continuous time when all conditions are
established.
4. GENERAL DRIVING CYCLE
Perform the diagnosis continuously when the vehicle is idling or running at a constant speed of 80 km/h (50
MPH) or more.
(1)
(2)
(B) Air fuel ratio
(E) Theoretical air fuel ratio
(2) Exhaust gas
Enable Conditions
Completed
1 s
GD(H4SO)-181
GENERAL DESCRIPTION
(E)
(A)
(C) (B)
(C) Rich
(F) Comparative voltage
(3) Electromotive force
(F)
(D)
EN-01696