Subaru Legacy IV (2008 year). Service 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)
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