Subaru Legacy IV (2008 year). Service manual — part 422

GD(H4DOTC)-138

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

BV:DTC P0461 FUEL LEVEL SENSOR “A” CIRCUIT RANGE/PERFORMANCE

1. OUTLINE OF DIAGNOSIS

Detect malfunctions of the fuel level sensor output property.
If the fuel level does not vary in a particular driving condition / engine condition where it should, judge as NG.

2. COMPONENT DESCRIPTION

3. ENABLE CONDITION

4. GENERAL DRIVING CYCLE

Always perform the diagnosis continuously.

(A)

Fuel level

(B)

Resistance

Secondary Parameters

Enable Conditions

None

EN-01734

0

(B)

(A)

GD(H4DOTC)-139

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: Less than 1 second
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 following conditions are established.

Time Needed for Diagnosis: Less than 1 second

Judgement Value

Malfunction Criteria

Threshold Value

Accumulated amount of intake air

t 330957 g (11672.85 oz)

Max. – min. values of fuel level output

< 2.6

2 (0.69 US gal,

0.57 Imp gal)

Battery voltage

t 10.9 V

Engine speed

< 6500 rpm

Elapsed time after starting the engine

t 5000 ms

Judgement Value

Malfunction Criteria

Threshold Value

Accumulated amount of intake air

t 330957 g (11672.85 oz)

Max. – min. values of fuel level output

t 2.6

2 (0.69 US gal,

0.57 Imp gal)

Battery voltage

t 10.9 V

Engine speed

< 6500 rpm

Elapsed time after starting the engine

t 5000 ms

GD(H4DOTC)-140

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

BW:DTC P0462 FUEL LEVEL SENSOR “A” CIRCUIT LOW

1. OUTLINE OF DIAGNOSIS

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

2. COMPONENT DESCRIPTION

3. ENABLE CONDITION

4. GENERAL DRIVING CYCLE

Always perform the diagnosis continuously.

(1)

Engine control module (ECM)

(3)

Fuel sub level sensor

(4)

Detecting circuit

(2)

Fuel level sensor

(5)

Body integrated unit

Secondary Parameters

Enable Conditions

None

(5)

(4)

(1)

(2)

(3)

EN-05371

GD(H4DOTC)-141

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 3000 ms

Output voltage

< 0.173 V

Judgement Value

Malfunction Criteria

Threshold Value

Battery voltage

t 10.9 V

Elapsed time after starting the engine

t 3000 ms

Output voltage

t 0.173 V