Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 358
GD(H4DOTC)-184
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
DE:DTC P0507 IDLE AIR CONTROL SYSTEM RPM HIGHER THAN EXPECTED
1. OUTLINE OF DIAGNOSIS
Detect the malfunction that actual engine speed is not close to target engine speed during idling. Judge as
NG when actual engine speed is not close to target engine speed during idling.
2. ENABLE CONDITIONS
3. GENERAL DRIVING CYCLE
Perform the diagnosis continuously at idling after warming up engine.
4. 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: 15 s × 1 time(s)
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: 15 s
Secondary Parameters
Enable Conditions
Engine coolant temperature
≥ 70 °C (158 °F)
Battery voltage
≥ 10.9 V
Atmospheric pressure
≥ 75 kPa (563 mmHg, 22.2 inHg)
Fuel level
≥ 9.6 2 (2.54 US gal, 2.11 Imp gal)
Elapsed time after starting the engine
≥ 10.49 s
Accelerator pedal position
= 0%
Lambda value (left and right)
≥ 0.9
and
< 1.1
After switching air conditioner to ON/OFF
≥ 5.1 s
After intake manifold pressure changes by 4 kPa (30 mmHg, 1.2 inHg) or more.
> 5.1 s
Elapsed time after switching neutral position switch to ON/OFF
> 5.1 s
Vehicle speed
0 km/h (0 MPH)
Judgment Value
Malfunction Criteria
Threshold Value
Actual engine speed – Targeted engine
speed
≥ 200 rpm
Feedback compensation for ISC
Min.
Judgment Value
Malfunction Criteria
Threshold Value
Actual engine speed – Targeted engine
speed
< 200 rpm
GD(H4DOTC)-185
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
DF:DTC P050A COLD START IDLE AIR CONTROL SYSTEM PERFORMANCE
1. OUTLINE OF DIAGNOSIS
• When cold, the abnormality in the control of target engine speed increase is detected. (P050A)
Judge as NG if the exhaust gas temperature diagnosis or idle speed diagnosis is NG.
• Exhaust gas temperature diagnosis
Judge as NG when the estimated exhausted gas temperature in 14 seconds after the cold start is below the
specified value.
• Idle speed diagnosis
Judge as NG when actual engine speed is not close to target engine speed at cold start.
• Detect malfunctions of the catalyst advanced idling retard angle control. (P050B)
Judge as NG when ECM is not controlling the angle properly during catalyst advanced idling retard angle
control.
• Final ignition timing diagnosis
Judge as NG when actual retard amount is under the specified value at cold start.
GD(H4DOTC)-186
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
2. ENABLE CONDITIONS
Secondary Parameters
Enable Conditions
<Exhaust gas temperature diagnosis>
Atmospheric pressure
≥ 75 kPa (563 mmHg, 22.2 inHg)
Battery voltage
> 10.9 V
Engine condition
In operation
Vehicle speed
≤ 2 km/h (1.2 MPH)
Elapsed time after gear position change
(P ←→ D or N ←→ D)
≥ 3000 ms
ISC feedback
In operation
Throttle opening angle
< 0.37 °
Fuel property
Not extremely low volatility
Target retard amount
≥ 0 °CA
<Idle speed diagnosis>
Atmospheric pressure
≥ 75 kPa (563 mmHg, 22.2 inHg)
Battery voltage
> 10.9 V
Engine condition
In operation
Vehicle speed
≤ 2 km/h (1.2 MPH)
Engine coolant temperature
≤ 60 °C (140 °F)
Intake air amount sum value
≤ Value of Map 1
Elapsed time after gear position change
(P ←→ D or N ←→ D)
≥ 3000 ms
Throttle opening angle
< 0.37 °
Fuel property
Not extremely low volatility
Elapsed time after starting the engine
≥ 2000 ms
<Final ignition timing diagnosis>
Atmospheric pressure
≥ 75 kPa (563 mmHg, 22.2 inHg)
Battery voltage
> 10.9 V
Engine condition
In operation
Vehicle speed
≤ 2 km/h (1.2 MPH)
Engine coolant temperature
≤ 60 °C (140 °F)
Intake air amount sum value
≤ Value of Map 2
Elapsed time after gear position change
(P ←→ D or N ←→ D)
≥ 3000 ms
Throttle opening angle
< 0.37 °
Fuel property
Not extremely low volatility
Target retard amount
≥ Value from Map 3
Map 1 (Models without SI-DRIVE)
Engine coolant temperature at
engine starting
°C (°F)
–40
(–40)
–30
(–22)
–20
(–4)
–10
(14)
0
(32)
10
(50)
20
(68)
30
(86)
Intake air amount sum value
g (oz)
1240
(43.73)
1170
(41.27)
1100
(38.8)
1040
(36.68)
980
(34.56)
570 (20.1) 280 (9.88) 265 (9.35)
Engine coolant temperature
at engine starting
°C (°F)
40
(104)
50
(122)
60
(140)
70
(158)
80
(176)
90
(194)
100
(212)
110
(230)
Intake air amount sum value
g (oz)
250 (8.82) 210 (7.41) 210 (7.41) 210 (7.41) 210 (7.41) 210 (7.41) 210 (7.41) 210 (7.41)
GD(H4DOTC)-187
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
3. GENERAL DRIVING CYCLE
Perform the diagnosis at cold start.
Map 1 (Models with SI-DRIVE)
Engine coolant temperature at
engine starting
°C (°F)
–40
(–40)
–30
(–22)
–20
(–4)
–10
(14)
0
(32)
10
(50)
20
(68)
30
(86)
Intake air amount sum value
g (oz)
950
(33.51)
925
(32.62)
900
(31.74)
870
(30.68)
840
(29.63)
620
(21.87)
420
(14.81)
310
(10.93)
Engine coolant temperature at
engine starting
°C (°F)
40
(104)
50
(122)
60
(140)
70
(158)
80
(176)
90
(194)
100
(212)
110
(230)
Intake air amount sum value
g (oz)
260 (9.17) 210 (7.41)
170 (6)
170 (6)
170 (6)
170 (6)
170 (6)
170 (6)
Map 2 (Models without SI-DRIVE)
Engine coolant temperature at
engine starting
°C (°F)
–40
(–40)
–30
(–22)
–20
(–4)
–10
(14)
0
(32)
10
(50)
20
(68)
30
(86)
Intake air amount sum value
g (oz)
1240
(43.73)
1170
(41.27)
1100
(38.8)
1040
(36.68)
980
(34.56)
570 (20.1) 280 (9.88) 265 (9.35)
Engine coolant temperature at
engine starting
°C (°F)
40
(104)
50
(122)
60
(140)
70
(158)
80
(176)
90
(194)
100
(212)
110
(230)
Intake air amount sum value
g (oz)
250 (8.82) 210 (7.41) 210 (7.41) 210 (7.41) 210 (7.41) 210 (7.41) 210 (7.41) 210 (7.41)
Map 2 (Models with SI-DRIVE)
Engine coolant temperature at
engine starting
°C (°F)
–40
(–40)
–30
(–22)
–20
(–4)
–10
(14)
0
(32)
10
(50)
20
(68)
30
(86)
Intake air amount sum value
g (oz)
950
(33.51)
925
(32.62)
900
(31.74)
870
(30.68)
840
(29.63)
620
(21.87)
420
(14.81)
310
(10.93)
Engine coolant temperature at
engine starting
°C (°F)
40
(104)
50
(122)
60
(140)
70
(158)
80
(176)
90
(194)
100
(212)
110
(230)
Intake air amount sum value
g (oz)
260 (9.17) 210 (7.41)
170 (6)
170 (6)
170 (6)
170 (6)
170 (6)
170 (6)
Map 3
Engine coolant
temperature
–40 °C
(–40 °F)
–30 °C
(–22 °F)
–20 °C
(–4 °F)
–10 °C
(14 °F)
0 °C
(32 °F)
10 °C
(50 °F)
20 °C
(68 °F)
30 °C
(86 °F)
40 °C
(104 °F)
50 °C
(122 °F)
60 °C
(140 °F)
Target retard
amount
6 °CA
6 °CA
6 °CA
6 °CA
6 °CA
6 °CA
6 °CA
6 °CA
6 °CA
6 °CA
6 °CA
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