Subaru Legacy IV (2008 year). Manual - part 184

GD(H4SO)-38

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

W: DTC P0122 THROTTLE/PEDAL POSITION SENSOR/SWITCH “A” CIRCUIT 

LOW

1. OUTLINE OF DIAGNOSIS

Detect the open or short circuit of throttle position sensor 1.
Judge as NG if out of specification.

2. COMPONENT DESCRIPTION

3. ENABLE CONDITION

4. GENERAL DRIVING CYCLE

Always perform the diagnosis continuously.

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: 24 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: 24 ms

(1)

Throttle position sensor 1 signal

(3)

Throttle position sensor

(4)

Engine control module (ECM)

(2)

Throttle position sensor 2 signal

 

 

 

 

Secondary Parameters

Enable Conditions

Ignition switch

ON

Battery voltage

t 6 V

Judgement Value

Malfunction Criteria

Threshold Value

Sensor 1 input voltage

d 0.217 V

Judgement Value

Malfunction Criteria

Threshold Value

Sensor 1 input voltage

> 0.217 V

EN-01859

(1)

(2)

(3)

(4)

GD(H4SO)-39

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

X: DTC P0123 THROTTLE/PEDAL POSITION SENSOR/SWITCH “A” CIRCUIT 

HIGH

1. OUTLINE OF DIAGNOSIS

Detect the open or short circuit of throttle position sensor 1.
Judge as NG if out of specification.

2. COMPONENT DESCRIPTION

3. ENABLE CONDITION

4. GENERAL DRIVING CYCLE

Always perform the diagnosis continuously.

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: 24 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: 24 ms

(1)

Throttle position sensor 1 signal

(3)

Throttle position sensor

(4)

Engine control module (ECM)

(2)

Throttle position sensor 2 signal

 

 

 

 

Secondary Parameters

Enable Conditions

Ignition switch

ON

Battery voltage

t 6 V

Judgement Value

Malfunction Criteria

Threshold Value

Sensor 1 input voltage

t 4.858 V

Judgement Value

Malfunction Criteria

Threshold Value

Sensor 1 input voltage

< 4.858 V

EN-01859

(1)

(2)

(3)

(4)

GD(H4SO)-40

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

Y: DTC P0125 INSUFFICIENT COOLANT TEMPERATURE FOR CLOSED LOOP 

FUEL CONTROL

1. OUTLINE OF DIAGNOSIS

Detect the malfunction of engine coolant temperature output property.
Judge as NG when the engine coolant temperature does not rise in driving conditions where it should.

2. COMPONENT DESCRIPTION

3. ENABLE CONDITION

4. GENERAL DRIVING CYCLE

Perform the diagnosis only once after engine start.

(A)

Resistance value (k

:)

(B)

Temperature °C (°F)

 

 

(1)

Connector

(2)

Thermistor element

Secondary Parameters

Enable Conditions

Engine speed

t Value from Map

Battery voltage

t 10.9 V

Map

Engine coolant temperature

°C (°F)

–40

(–40)

–30

(–22)

–20

(–4)

–10

(14)

0

(32)

10

(50)

20

(68)

30

(86)

Engine speed

rpm

500

500

500

500

500

500

500

500

Engine coolant temperature

°C (°F)

40

(104)

50

(122)

60

(140)

70

(158)

80

(176)

90

(194)

100

(212)

110

(230)

Engine speed

rpm

500

500

500

500

500

500

500

500

EN-02917

(A)

(2)

(1)

(B)

GD(H4SO)-41

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

5. DIAGNOSTIC METHOD

• Abnormality Judgement

Judge as NG if the criteria below are met.

Timer for diagnosis after engine start
a. Timer stop at fuel cut
b. During the driving conditions except a) above, timer counts up as follows.
64 milliseconds + TWCNT milliseconds (the time of at 64 milliseconds)
TWCNT is defined as follows,
TWCNT = 0 at idle switch ON,
TWCNT show on the following table at idle switch OFF.

Judgement value of timer after engine starting
t = 573669  ms – 33924  ms × Ti
Ti : The lowest coolant temperature after engine start
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 when the malfunction criteria below are met.

Time Needed for Diagnosis: Less than 1 second

Judgement Value

Malfunction Criteria

Threshold Value

Engine coolant temperature

< 20 °C (68 °F)

Timer for diagnosis after engine start

t Judgement value of 
timer after engine start

 

Vehicle speed km/h (MPH)

0 (0)

8 (5)

16 (9.9)

24 (14.9)

32 (19.9)

40 (24.9)

48 (29.8)

56 (34.8)

Temperature

°C (°F)

–20 (–4)

0 ms

32.076 ms

39.977 ms

47.879 ms

82.544 ms 117.209 ms 154.214 ms 185.26 ms

–10 (14)

0 ms

25.704 ms

33.606 ms

41.508 ms

68.52 ms

95.532 ms 125.667 ms 155.802 ms

0  (32)

0 ms

17.646 ms

25.548 ms

33.45 ms

53.652 ms

73.855 ms

97.12 ms

120.386 ms

10  (50)

0 ms

7.901 ms

15.802 ms

23.704 ms

37.941 ms

52.177 ms

68.573 ms

82.538 ms

20  (68)

0 ms

7.901 ms

15.802 ms

23.704 ms

37.941 ms

52.177 ms

68.573 ms

82.538 ms

Judgement Value

Malfunction Criteria

Threshold Value

Engine coolant temperature

t 20 °C (68 °F)