P2096 Post Catalyst Fuel Trim System Too Lean Bank - Subaru Impreza 2005 General Description Manual

Diagnostic Trouble Code (DTC) Detecting Criteria
DN: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, if it is shifted to lean.
If the sub feedback amount from the engine started till ignition switch OFF is shifted to rich or lean, judge as
insufficient sub feedback amount.
If insufficient, change the sub feedback amount guard value and shift judge line, and increment the guard op-
eration counter (tentative NG counter).
Judge NG when the guard operation counter (tentative NG counter) exceeds the specified value and sub
feedback amount is shifted to lean.
2. COMPONENT DESCRIPTION
(3)
V
(2)
(1) Atmosphere
(2) Exhaust gas
(3) Electromotive force
3. ENABLE CONDITION
Secondary Parameters
Engine coolant temperature
Accumulative time of closed loop control
with secondary oxygen sensor
Closed loop control with secondary oxy-
gen sensor
Idling SW
Accumulative time of vehicle speed
above 75 km/h (rich side only)
4. GENERAL DRIVING CYCLE
Perform the diagnosis at a speed of more than 75 km/h (47 MPH).
(1)
(2)
Enable Conditions
≥ 40 degC and < 105
degC
130 secs.
In operation
Off
55 secs.
GD(STi)-243
(A)
(C)
(A) Electromotive force
(B) Air fuel ratio
(C) Rich
(D) Lean
(E) Theoretical air fuel ratio
(F) Comparative voltage
GENERAL DESCRIPTION
(E)
(F)
(B) (D)
EN-01696