Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 379
GD(H4DOTC)-268
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
3. ENABLE CONDITIONS
4. GENERAL DRIVING CYCLE
Perform diagnosis continuously at a constant speed of 20 km/h (12.4 MPH) or more after 0 ms have passed
since the engine started.
5. DIAGNOSTIC METHOD
• Abnormality Judgment
If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.
Time Needed for Diagnosis: 10000 ms
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cy-
cles.
• Normality Judgment
Judge as OK and clear the NG if the continuous time while the following conditions are established is more
than the predetermined time.
Time Needed for Diagnosis: Less than 1 second
Secondary Parameters
Enable Conditions
Time needed for all secondary parameters to be in enable conditions
≥ 4096 ms
Battery voltage
≥ 10.9 V
Atmospheric pressure
≥ 75 kPa (563 mmHg, 22.2 inHg)
Rear oxygen sensor sub feedback
Execution
Rear oxygen sensor output voltage – Feedback target voltage
– 0.2 V — 0.1 V
or
Rear oxygen sensor sub feedback compensation coefficient
On Min.
or
Rear oxygen sensor sub feedback compensation coefficient
On Max.
Elapsed time after starting the engine
≥ 0 ms
Engine coolant temperature
≥ –40 °C (–40 °F)
Vehicle speed
≥ 20 km/h (12.4 MPH)
Amount of intake air
≥ 6 g/s (0.21 oz/s)
Load change at 180°CA
< 255 g/rev (8.99 oz/rev)
Front oxygen (A/F) sensor impedance
0 Ω — 50 Ω
Learning value of evaporation gas density
< 1
Total time of operating canister purge
≥ 0 s
Targeted lambda value load compensation coefficient
–1 — 1
Judgment Value
Malfunction Criteria
Threshold Value
λ value
< 0.85
Judgment Value
Malfunction Criteria
Threshold Value
λ value
≥ 0.85
GD(H4DOTC)-269
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
FG:DTC P2196 O2 SENSOR SIGNAL BIASED/STUCK RICH (BANK 1 SENSOR 1)
1. OUTLINE OF DIAGNOSIS
Detect that λ value remains high.
Judge as NG when lambda value is abnormal in accordance with λ value of front oxygen (A/F) sensor and
running conditions such as vehicle speed, amount of intake air, engine coolant temperature, sub feedback
control, etc.
2. COMPONENT DESCRIPTION
λ value = Actual air fuel ratio/Theoretical
air fuel ratio
λ > 1: Lean
λ < 1: Rich
(A)
Electromotive force
(B)
Air fuel ratio
(C)
Rich
(D)
Lean
(1)
Exhaust gas
(2)
ZrO
2
EN-09361
(C)
(B)
(D)
(A)
(2)
(1)
(1)
GD(H4DOTC)-270
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
3. ENABLE CONDITIONS
4. GENERAL DRIVING CYCLE
Perform diagnosis continuously at a constant speed of 20 km/h (12.4 MPH) or more after 0 ms have passed
since the engine started.
5. DIAGNOSTIC METHOD
• Abnormality Judgment
If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.
Time Needed for Diagnosis: 10000 ms
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cy-
cles.
• Normality Judgment
Judge as OK and clear the NG if the continuous time while the following conditions are established is more
than the predetermined time.
Time Needed for Diagnosis: Less than 1 second
Secondary Parameters
Enable Conditions
Time needed for all secondary parameters to be in enable
conditions
≥ 4096 ms
Battery voltage
≥ 10.9 V
Atmospheric pressure
≥ 75 kPa (563 mmHg, 22.2 inHg)
Rear oxygen sensor sub feedback
Execution
Rear oxygen sensor output voltage – Feedback target voltage
– 0.2 V — 0.1 V
or
Rear oxygen sensor sub feedback compensation coefficient
On Min.
or
Rear oxygen sensor sub feedback compensation coefficient
On Max.
Elapsed time after starting the engine
≥ 0 ms
Engine coolant temperature
≥ –40 °C (–40 °F)
Vehicle speed
≥ 20 km/h (12.4 MPH)
Amount of intake air
≥ 6 g/s (0.21 oz/s)
Load change at 180°CA
< 255 g/rev (8.99 oz/rev)
Front oxygen (A/F) sensor impedance
0 Ω — 50 Ω
Learning value of evaporation gas density
< 1
Total time of operating canister purge
≥ 0 s
Targeted lambda value load compensation coefficient
–1 — 1
Judgment Value
Malfunction Criteria
Threshold Value
λ value
> 1.15
Judgment Value
Malfunction Criteria
Threshold Value
λ value
≤ 1.15
GD(H4DOTC)-271
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
FH:DTC P219A BANK 1 AIR-FUEL RATIO IMBALANCE
1. OUTLINE OF DIAGNOSIS
Detect malfunction of air fuel ratio deviation between cylinders from main feedback learning value, sub feed-
back learning value and engine speed variation.
2. ENABLE CONDITIONS
3. GENERAL DRIVING CYCLE
Always perform the diagnosis continuously.
Secondary Parameters
Enable Conditions
Battery voltage
> 10.9 V
Atmospheric pressure
> 75 kPa (563 mmHg,
22.2 inHg)
A/F main learning system
In operation
Engine speed
> 550 rpm
Engine coolant temperature
> 75 °C (167 °F)
Intake air temperature
< 200 °C (392 °F)
Engine load
> Value of Map 1
Engine load change
< 0.02 g/rev (0 oz/rev)
Evaporative system leak check
Not in operation
Cumulative time of canister purge after
engine start
≥ 0 s
Learning value of EVAP conc.
< 1
Vehicle dynamic control or AT torque
control
Not in operation
Intake manifold pressure change at
180°CA
< Value of Map 2
Throttle position change during 16 milli-
seconds
< 14 °
Fuel shut-off function
Not in operation
Map 1
Engine speed (rpm)
Idling
650
1000
1500
2000
2500
3000
3500
4000
4500
Measured value (g (oz)/rev)
na
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
Map 2 (Models without SI-DRIVE)
rpm
750
1000
1500
2000
2500
3000
3500
4000
kPa
(mmHg, inHg)
13.3
(100, 3.9)
13.3
(100, 3.9)
13.3
(100, 3.9)
13.3
(100, 3.9)
13.3
(100, 3.9)
13.3
(100, 3.9)
13.3
(100, 3.9)
13.3
(100, 3.9)
rpm
4500
5000
5500
6000
6500
6700
kPa
(mmHg, inHg)
13.3
(100, 3.9)
13.3
(100, 3.9)
13.3
(100, 3.9)
13.3
(100, 3.9)
13.3
(100, 3.9)
13.3
(100, 3.9)
Map 2 (Models with SI-DRIVE)
rpm
700
1000
1500
2000
2500
3000
3500
4000
kPa
(mmHg, inHg)
13.3
(100, 3.9)
13.3
(100, 3.9)
13.3
(100, 3.9)
13.3
(100, 3.9)
13.3
(100, 3.9)
13.3
(100, 3.9)
13.3
(100, 3.9)
13.3
(100, 3.9)
rpm
4500
5000
5500
6000
6500
6700
kPa
(mmHg, inHg)
13.3
(100, 3.9)
13.3
(100, 3.9)
13.3
(100, 3.9)
13.3
(100, 3.9)
13.3
(100, 3.9)
13.3
(100, 3.9)
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