Subaru 2009 IMPREZA Service Manual page 819

Diagnostic Trouble Code (DTC) Detecting Criteria
3. ENABLE CONDITIONS
Secondary Parameters
Elapsed time after starting the engine
Engine coolant temperature
Engine speed
Intake manifold pressure (absolute pressure)
Ambient air temperature
Throttle position
Battery voltage
Barometric pressure
Vehicle speed
Fuel shut-off function
Neutral switch
After neutral switch ON/OFF change
No load change (A/C, power steering, lighting,
rear defogger, heater fan and radiator fan)
Map
Engine coolant temperature
°C (°F)
After neutral switch change
msec
Engine coolant temperature
°C (°F)
After neutral switch change
msec
4. GENERAL DRIVING CYCLE
During deceleration fuel cut from 53 km/h (approx. 33 MPH) or more, perform diagnosis once.
Be careful of vehicle speed and engine speed. (Diagnosis will not be completed if the vehicle speed and en-
gine speed conditions become out of specification due to deceleration.)
5. DIAGNOSTIC METHOD
Measure the pressure values when the enable conditions are established, and perform diagnosis by calcu-
lating those results.
1. Label the intake manifold pressure value as PMOF1, which is observed when enable conditions are es-
tablished, and set the EGR target step to 50 steps (nearly full open).
2. Label the intake manifold pressure value as PMON, which is observed after one second has passed since
EGR target step was set to 50 steps (when the enable conditions were established), and set the EGR target
step to 0.
3. Label the intake manifold pressure as PMOF2, which is observed after one second has passed since EGR
target step was set to 0 (after two seconds have passed since the enable conditions were established).
Enable Condition
40 s
75 °C (167 °F)
1200 rpm — 2950 rpm
< 44 kPa (330 mmHg, 13 inHg)
5 °C (41 °F)
< 0.25 °
10.9 V
75 kPa (563 mmHg, 22.2 inHg)
58 km/h (36 MPH)
In operation
OFF
Value from Map
5000 ms
–40 –30 –20 –10
(–40) (–22) (–4) (14)
0 0 0 0
40 50 60 70
(104) (122) (140) (158)
0 0 0 0
GD(H4SO)-95
0 10 20 30
(32) (50) (68) (86)
0 0 0 0
80 90 100 110
(176) (194) (212) (230)
0 0 0 0
GENERAL DESCRIPTION