Subaru Legacy IV (2008 year). Manual - part 430

GD(H4DOTC)-170

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

CQ:DTC P1160 RETURN SPRING FAILURE

1. OUTLINE OF DIAGNOSIS

Judge as NG when the valve is opened more than the default opening angle, but does not move to the close
direction with the motor power stopped.

2. COMPONENT DESCRIPTION

3. ENABLE CONDITION

4. GENERAL DRIVING CYCLE

• Ignition switch ON 

o OFF

• Ignition switch OFF 

o ON (Only after clearing memory)

(1)

Opener spring

(4)

Full closed stopper

(7)

DC motor

(2)

Return spring

(5)

Throttle valve

(8)

Main and sub throttle position sensor

(3)

Intermediate stopper

(6)

Gear

Secondary Parameters

Enable Conditions

Battery voltage

t 6 V

Throttle position sensor

Normal

EN-04463

S S

(8)

(6)

(7)

(5)

(1)

(3)

(2)

(4)

GD(H4DOTC)-171

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

5. DIAGNOSTIC METHOD

• Abnormality Judgement

Judge as NG when the following conditions are established.

Time Needed for Diagnosis: 24 ms
Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

• Normality Judgement

Judge as OK and clear the NG if the following conditions are established.

Time Needed for Diagnosis: 3400 ms

Judgement Value

Malfunction Criteria

Threshold Value

Opening variation after continuity is set 
to OFF

< 2 °

Judgement Value

Malfunction Criteria

Threshold Value

Opening variation after continuity is set 
to OFF

t 2 °

GD(H4DOTC)-172

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

CR:DTC P1400 FUEL TANK PRESSURE CONTROL SOLENOID VALVE CIRCUIT 

LOW

1. OUTLINE OF DIAGNOSIS

Detect the open/short circuit of pressure control solenoid valve.
Judge as NG when ECM output level is different from actual terminal level.

2. COMPONENT DESCRIPTION

3. ENABLE CONDITION

4. GENERAL DRIVING CYCLE

Always perform the diagnosis after starting the engine.

(A)

Barometric pressure

(B)

Shut-off valve

(C)

To fuel tank

(1)

Filter

(3)

Connector terminal

(5)

Valve

(2)

Coil

(4)

Diaphragm

Secondary Parameters

Enable Conditions

None

 

EN-01759

(1)

(2)

(3)

(4)

(5)

(A)

(B)

(C)

GD(H4DOTC)-173

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

Battery voltage

t 10.9 V

Elapsed time after starting the engine

t 1 second

Terminal output voltage when ECM out-
puts OFF signal

Low

Judgement Value

Malfunction Criteria

Threshold Value

Battery voltage

t 10.9 V

Elapsed time after starting the engine

t 1 second

Terminal output voltage when ECM out-
puts OFF signal

High