Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 357
GD(H4DOTC)-180
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
DB:DTC P04DB CRANKCASE VENTILATION SYSTEM DISCONNECTED
1. OUTLINE OF DIAGNOSIS
Detect the blow-by hose disconnection abnormality.
Judge as NG when the diagnosis terminal voltage is high.
2. COMPONENT DESCRIPTION
3. ENABLE CONDITIONS
4. GENERAL DRIVING CYCLE
Always perform the diagnosis continuously.
(1)
Engine control module (ECM)
(3)
PCV diagnosis connector
(4)
5 V
(2)
Detecting circuit
Secondary Parameters
Enable Conditions
None
EN-01790
E
(1)
(2)
(3)
(4)
GD(H4DOTC)-181
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
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: 2500 ms
Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.
• 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
Judgment Value
Malfunction Criteria
Threshold Value
Battery voltage
≥ 10.9 V
Engine condition
After engine starting
Positive crankcase ventilation diagnosis voltage
High
Judgment Value
Malfunction Criteria
Threshold Value
Battery voltage
≥ 10.9 V
Engine condition
After engine starting
Positive crankcase ventilation diagnosis voltage
Low
GD(H4DOTC)-182
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
DC:DTC P0500 VEHICLE SPEED SENSOR “A”
1. OUTLINE OF DIAGNOSIS
Judge as NG when outside of the judgment value.
Judge NG when the received data from ABSCM&H/U is abnormal vehicle speed, and the vehicle speed data
is impossible.
2. COMPONENT DESCRIPTION
Vehicle speed signals are taken in to the ABS control module and hydraulic control unit, and normal/errone-
ous data of the ABS wheel speed sensor is received by CAN communication from the ABS control module
and hydraulic control unit.
3. ENABLE CONDITIONS
4. GENERAL DRIVING CYCLE
Always perform diagnosis more than 2000 ms after starting the engine.
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: 2500 ms
Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.
• 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: 2500 ms
Secondary Parameters
Enable Conditions
Battery voltage
≥ 10.9 V
Elapsed time after engine starting
≥ 2000 ms
Judgment Value
Malfunction Criteria
Threshold Value
Front ABS wheel speed sensor status
Malfunction
Either of the following is established
Front left wheel speed
≥ 300 km/h (186.4 MPH)
Front right wheel speed
≥ 300 km/h (186.4 MPH)
Judgment Value
Malfunction Criteria
Threshold Value
Front left wheel speed
> 0 km/h (0 MPH)
and
< 300 km/h (186.4 MPH)
Front right wheel speed
> 0 km/h (0 MPH)
and
< 300 km/h (186.4 MPH)
GD(H4DOTC)-183
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
DD:DTC P0506 IDLE AIR CONTROL SYSTEM RPM LOWER 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
< –100 rpm
Feedback compensation for ISC
Max.
Judgment Value
Malfunction Criteria
Threshold Value
Actual engine speed – Targeted engine speed
≥ –100 rpm
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