Subaru 2009 IMPREZA Service Manual page 1791

Diagnostic Trouble Code (DTC) Detecting Criteria
DU:DTC P2096 POST CATALYST FUEL TRIM SYSTEM TOO LEAN (BANK 1)
1. OUTLINE OF DIAGNOSIS
Detect the malfunction of fuel system from the size of the sub feedback learning value.
Control the sub feedback learning and judge as NG when the learning value is in the lean zone.
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 Condition
Completed
1 s
GD(H4DOTC)-203
GENERAL DESCRIPTION
(E)
(A)
(C) (B)
(C) Rich
(F) Comparative voltage
(3) Electromotive force
(F)
(D)
EN-01696