Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. 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