Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 320
GD(H4DOTC)-32
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
V: DTC P0068 MAP/MAF - THROTTLE POSITION CORRELATION
1. OUTLINE OF DIAGNOSIS
Detect problems in the intake manifold pressure sensor output properties.
Judge as NG when the intake air pressure AD value is Low whereas it seemed to be High from the viewpoint
of engine condition, or when it is High whereas it seemed to be Low from the engine condition.
2. COMPONENT DESCRIPTION
3. ENABLE CONDITIONS
4. GENERAL DRIVING CYCLE
Perform the diagnosis continuously after idling.
(A)
Output voltage
(B)
Absolute pressure
(1)
Connector
(2)
Terminals
(3)
O-ring
Secondary Parameters
Enable Conditions
Engine coolant temperature
≥ 70 °C (158 °F)
EN-01765
(B)
(A)
(2)
(3)
(1)
GD(H4DOTC)-33
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
5. DIAGNOSTIC METHOD
• Abnormality Judgment
Judge as NG when Low side or High side becomes NG.
If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.
Time Needed for Diagnosis:
Low side: 5000 ms
High side: 5000 ms
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cy-
cles.
• Normality Judgment
Judge as OK and clear the NG when both Low side and High side become OK.
If the duration of time while the following conditions are met is longer than the time indicated, judge as OK.
Time Needed for Diagnosis:
Low side: Less than 1 second
High side: Less than 1 second
Judgment Value
Malfunction Criteria
Threshold Value
Low
Engine speed
< 2500 rpm
Throttle position
≥ 10 °
Output voltage
< 1 V (Models without SI-DRIVE)
< 0.764 V (Models with SI-DRIVE)
Engine load
> 1.356 g/rev (0.05 oz/rev)
High
Engine speed
600 rpm — 900 rpm
Throttle position
< 2.75 °
Output voltage
≥ 2.36 V (Models without SI-DRIVE)
≥ 2.126 V (Models with SI-DRIVE)
Engine load
< 0.4 g/rev (0.01 oz/rev)
Judgment Value
Malfunction Criteria
Threshold Value
Low
Engine speed
< 2500 rpm
Throttle position
≥ 10 °
Output voltage
≥ 1 V (Models without SI-DRIVE)
≥ 0.764 V (Models with SI-DRIVE)
Engine load
> 1.356 g/rev (0.05 oz/rev)
High
Engine speed
600 rpm — 900 rpm
Throttle position
< 2.75 °
Output voltage
< 2.36 V (Models without SI-DRIVE)
< 2.126 V (Models with SI-DRIVE)
Engine load
< 0.4 g/rev (0.01 oz/rev)
GD(H4DOTC)-34
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
W: DTC P0101 MASS OR VOLUME AIR FLOW CIRCUIT RANGE/PERFOR-
MANCE
1. OUTLINE OF DIAGNOSIS
Detect the malfunction of air flow sensor output properties.
Judge as a low side NG when the air flow voltage indicates a small value regardless of running in a state
where the air flow voltage increases. Judge as a high side NG when the air flow voltage indicates a large val-
ue regardless of running in a state where the air flow voltage decreases. Judge air flow sensor property NG
when the Low side or High side becomes NG.
2. COMPONENT DESCRIPTION
3. ENABLE CONDITIONS
4. GENERAL DRIVING CYCLE
Perform the diagnosis continuously after idling.
(A)
Air
(1)
Air flow sensor
(3)
Voltage (V)
(4)
Amount of intake air (kg (lb)/s)
(2)
Intake air temperature sensor
Secondary Parameters
Enable Conditions
Engine coolant temperature
≥ 70 °C (158 °F)
EN-01766
(3)
(4)
(2)
(1)
(A)
GD(H4DOTC)-35
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
5. DIAGNOSTIC METHOD
• Abnormality Judgment
Judge as NG when Low side or High side becomes NG.
If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.
Time Needed for Diagnosis:
Low: 5000 ms
High: 5000 ms
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cy-
cles.
• Normality Judgment
Judge as OK and clear the NG when both Low side and High side become OK.
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:
Low: Less than 1 second
High: Less than 1 second
Judgment Value
Malfunction Criteria
Threshold Value
Low
Output voltage
< 1.5 V
Engine speed
≥ 2500 rpm
Throttle opening angle
≥ 15 °
Intake manifold pressure
≥ 53.3 kPa (400 mmHg, 15.7 inHg)
High (1)
Output voltage
≥ 1.95 V
Engine speed
600 rpm — 900 rpm
Throttle opening angle
< 4.1 °
Intake manifold pressure
< 52.7 kPa (395 mmHg, 15.6 inHg)
High (2)
Output voltage
≥ 1.70 V
Engine speed
600 rpm — 900 rpm
Throttle opening angle
< 4.1 °
Intake manifold pressure
< 52.7 kPa (395 mmHg, 15.6 inHg)
Fuel system diagnosis
Rich side malfunction
Judgment Value
Malfunction Criteria
Threshold Value
Low
Output voltage
≥ 1.5 V
Engine speed
≥ 2500 rpm
Throttle opening angle
≥ 15 °
Intake manifold pressure
≥ 53.3 kPa (400 mmHg, 15.7 inHg)
High
Output voltage
< 1.95 V
Engine speed
600 rpm — 900 rpm
Throttle opening angle
< 4.1 °
Intake manifold pressure
< 52.7 kPa (395 mmHg, 15.6 inHg)
Fuel system diagnosis
Rich side normal
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