Subaru 2009 IMPREZA Service Manual page 1639

Diagnostic Trouble Code (DTC) Detecting Criteria
2. COMPONENT DESCRIPTION
(2)
(4)
(A) Electromotive force
(D) Rich
(1) Atmosphere
(2) Exhaust gas
3. ENABLE CONDITIONS
Secondary Parameters
Time needed for all secondary parame-
ters to be in enable conditions
Battery voltage
Barometric pressure
Closed loop control with main feedback
Front oxygen (A/F) sensor impedance
Elapsed time after starting the engine
Engine coolant temperature
Engine speed
Vehicle speed
Amount of intake air
Engine load
Learning value of EVAP conc. during
purge
Total time of operating canister purge
4. GENERAL DRIVING CYCLE
Perform diagnosis only once at a constant speed of 10 km/h — 120 km/h (6.2 MPH — 74.6 MPH) 120000 ms
or more after starting the engine.
(3)
(1)
(2)
(B) Air fuel ratio
(3) ZrO
2
Enable Condition
1024 ms
10.9 V
> 75 kPa (563 mmHg,
22.2 inHg)
Operation
0 — 50
120000 ms
70 °C (158 °F)
1000 rpm — 3200 rpm
10 km/h — 120 km/h
(6.2 MPH — 74.6 MPH)
10 g/s — 31 g/s
(0.35 oz/s — 1.09 oz/s)
< 0.02 g/rev (0 oz/rev)
< 0.2
19.9 s
GD(H4DOTC)-51
(A)
(C)
(C) Lean
(4) Ceramic heater
GENERAL DESCRIPTION
(B) (D)
EN-01693