Subaru Legacy IV (2008 year). Manual - part 628

GD(H6DO)-132

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

CI: DTC P0453 EVAPORATIVE EMISSION CONTROL SYSTEM PRESSURE 

SENSOR HIGH INPUT

1. OUTLINE OF DIAGNOSIS

Detect the open or short circuit of the fuel tank pressure sensor.
Judge as NG if out of specification.

2. COMPONENT DESCRIPTION

3. ENABLE CONDITION

4. GENERAL DRIVING CYCLE

Perform the diagnosis when purging enable conditions are met without idling.

(A)

Output voltage

(B)

Input voltage

(C)

To fuel tank

(1)

Connector

(2)

Terminals

Secondary Parameters

Enable Conditions

Time needed for all secondary parame-
ters to be in enable conditions

t 5000 ms

Vehicle speed

t 2 km/h (1.2 MPH)

All conditions of EVAP canister purge

Completed

Learning value of evaporation gas con-
centration (left and right)

< 0.08 

Main feedback compensation coefficient 
(left and right)

t 0.9 

Battery voltage

t 10.9 V

EN-04462

(A)

(B)

(2)

(1)

(C)

GD(H6DO)-133

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

5. DIAGNOSTIC METHOD

• Abnormality Judgement

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Time Needed for Diagnosis: 15000 ms
Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

• Normality Judgement

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

CJ:DTC P0456 EVAPORATIVE EMISSION CONTROL SYSTEM LEAK DETECTED 

(VERY SMALL LEAK)

1. OUTLINE OF DIAGNOSIS

NOTE:
For the detection standard, refer to DTC P0442. <Ref. to GD(H6DO)-108, DTC P0442 EVAPORATIVE
EMISSION CONTROL SYSTEM LEAK DETECTED (SMALL LEAK), Diagnostic Trouble Code (DTC) De-
tecting Criteria.>

CK:DTC P0457 EVAPORATIVE EMISSION CONTROL SYSTEM LEAK DETECTED 

(FUEL CAP LOOSE/OFF)

1. OUTLINE OF DIAGNOSIS

For the detection standard, refer to DTC P0442. <Ref. to GD(H6DO)-108, DTC P0442 EVAPORATIVE
EMISSION CONTROL SYSTEM LEAK DETECTED (SMALL LEAK), Diagnostic Trouble Code (DTC) De-
tecting Criteria.>

Judgement Value

Malfunction criteria

Threshold value

Fuel tank pressure

t 8 kPa (59.85 mmHg, 
2.4 inHg)

Fuel temperature

< 35 °C (95 °F)

Barometric pressure

t 75 kPa (563 mmHg, 
22.2 inHg)

Judgement Value

Malfunction Criteria

Threshold Value

Fuel tank pressure

< 8 kPa (59.85 mmHg, 
2.4 inHg)

GD(H6DO)-134

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

CL:DTC P0458 EVAPORATIVE EMISSION SYSTEM PURGE CONTROL VALVE 

CIRCUIT LOW

1. OUTLINE OF DIAGNOSIS

Detect open or short circuit of the purge control solenoid valve.
Judge as NG when the ECM output level differs from the actual terminal level.

2. COMPONENT DESCRIPTION

3. ENABLE CONDITION

4. GENERAL DRIVING CYCLE

Always perform the diagnosis after starting the engine.

(A)

To canister

(B)

To intake manifold

 

 

Secondary Parameters

Enable Conditions

Battery voltage

t 10.9 V

Elapsed time after starting the engine

t 1 second

(A)

(B)

EN-02197

GD(H6DO)-135

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

5. DIAGNOSTIC METHOD

• Abnormality Judgement

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 when malfunction occurs in 2 continuous driving cy-
cles.

• Normality Judgement

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

Judgement Value

Malfunction criteria

Threshold value

Duty ratio of “ON”

< 0.75 

Terminal output voltage

Low

Judgement Value

Malfunction Criteria

Threshold Value

Terminal output voltage

High