Subaru Legacy IV (2008 year). Service manual — part 194
GD(H4SO)-78
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
AS:DTC P0223 THROTTLE/PEDAL POSITION SENSOR/SWITCH “B” CIRCUIT
HIGH
1. OUTLINE OF DIAGNOSIS
Detect the open or short circuit of throttle position sensor 2.
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 2 input voltage
t 4.858 V
Judgement Value
Malfunction Criteria
Threshold Value
Sensor 2 input voltage
< 4.858 V
EN-01859
(1)
(2)
(3)
(4)
GD(H4SO)-79
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
AT:DTC P0301 CYLINDER 1 MISFIRE DETECTED
1. OUTLINE OF DIAGNOSIS
Detect the presence of misfire occurrence. (Revolution fluctuation method)
Monitoring Misfire which influences exhaust deterioration (1.5 times of FTP) and catalyst damage is made
obligatory by the law. Misfire affecting these two has two patterns below. :
• Intermittent misfire (The same cylinder misfires in random, or different cylinders misfire in random.) : FTP
1.5 times misfire
• Every time misfire (The same cylinder misfires every time.) : FTP 1.5 times misfire, Catalyst damage mis-
fire
The following detecting methods are adopted for these detection.
1) Intermittent misfire: FTP 1.5 times misfire
• 180° Interval Difference Method (MT: 1,800 rpm or less; AT: None)
• 360° Interval Difference Method (whole range)
• 720° Interval Difference Method (3,000 rpm or more)
2) Misfire every time: FTP 1.5 times misfire, Catalyst damage misfire
• 360° Interval Difference Method
2. ENABLE CONDITION
Secondary Parameters
Enable Conditions
All secondary parameters enable condi-
tions
t 1024 ms
Intake manifold pressure change at
180°CA
< Value of Map 1
Throttle position change during 16 milli-
seconds
< 21 °
Fuel shut-off function
Not in operation
Fuel level
t 9.6
2 (2.54 US gal,
2.11 Imp gal)
Vehicle dynamic control or AT torque
control
Not in operation
Evaporative system leak check
Not in operation
Engine speed
460 rpm — 6300 rpm
Intake manifold pressure
t Value from Map 2
Battery voltage
t 8 V
Fuel parameter determination
Not extremely low vol-
atility
Elapsed time after starting the engine
t 0 ms
Engine load change during 32 millisec-
onds
< 1000 rpm
GD(H4SO)-80
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
Map1
• AT model
• MT model
Map2
• AT model
• MT model
3. GENERAL DRIVING CYCLE
• If conditions are met, it is possible to detect the misfires from idling to high engine speed. However, to
avoid excessive load or harm to the engine, perform diagnosis at idle.
• Perform the diagnosis continuously.
rpm
700
1000
1500
2000
2500
3000
3500
4000
4500
5000
5500
6000
6300
kPa
(mmHg,
inHg)
13.3
(100,
3.9)
13.3
(100,
3.9)
13.3
(100,
3.9)
13.3
(100,
3.9)
13.3
(100,
3.9)
13.3
(100,
3.9)
13.3
(100,
3.9)
13.3
(100,
3.9)
13.3
(100,
3.9)
13.3
(100,
3.9)
13.3
(100,
3.9)
13.3
(100,
3.9)
13.3
(100,
3.9)
rpm
650
1000
1500
2000
2500
3000
3500
4000
4500
5000
5500
6000
6300
kPa
(mmHg,
inHg)
13.3
(100,
3.9)
13.3
(100,
3.9)
13.3
(100,
3.9)
13.3
(100,
3.9)
13.3
(100,
3.9)
13.3
(100,
3.9)
13.3
(100,
3.9)
13.3
(100,
3.9)
13.3
(100,
3.9)
13.3
(100,
3.9)
13.3
(100,
3.9)
13.3
(100,
3.9)
13.3
(100,
3.9)
rpm
700
1000
1500
2000
2500
3000
3500
4000
4500
5000
5500
6000
6300
kPa
(mmHg,
inHg)
26
(195.0,
7.7)
23.9
(179.5,
7.1)
23.3
(174.7,
6.9)
23.1
(173.2,
6.8)
23.6
(176.8,
7)
25.1
(188.0,
7.4)
26.2
(196.9,
7.8)
26.6
(199.6,
7.9)
26.9
(201.5,
7.9)
30
(225.0,
8.9)
33.4
(250.4,
9.9)
37.8
(283.5,
11.2)
39.5
(296.0,
11.7)
Vehicle speed < 64 km/h (39.8 MPH)
rpm
650
1000
1500
2000
2500
3000
3500
4000
4500
5000
5500
6000
6300
kPa
(mmHg,
inHg)
24.5
(184,
7.2)
22.7
(170.3,
6.7)
21.4
(160.2,
6.3)
21.5
(161.6,
6.4)
21.5
(161.4,
6.4)
23.2
(174.4,
6.9)
24.7
(185.5,
7.3)
25.8
(193.3,
7.6)
27.1
(203.2,
8)
28.8
(216.3,
8.5)
32.3
(242.2,
9.5)
36.3
(272,
10.7)
37.9
(284.5,
11.2)
Vehicle speed
t 68 km/h (42.3 MPH)
rpm
650
1000
1500
2000
2500
3000
3500
4000
4500
5000
5500
6000
6300
kPa
(mmHg,
inHg)
31.6
(237,
9.3)
31.6
(237,
9.3)
31.6
(237,
9.3)
31.1
(233,
9.2)
31.3
(235,
9.3)
33.1
(248,
9.8)
33.9
(254,
10)
28.8
(216,
8.5)
30.1
(226,
8.9)
33.3
(250,
9.8)
36.9
(277,
10.9)
40.1
(301,
11.9)
43.2
(324,
12.8)
GD(H4SO)-81
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
4. DIAGNOSTIC METHOD
When a misfire occurs, the engine speed will decreased and the crankshaft position speed will change. Cal-
culate the interval difference value (diagnostic value) from crankshaft position speed by the following formu-
la, and judge whether a misfire is occurring or not comparing the calculated result with judgment value.
Counting the number of misfires. If the misfire ratio is higher during 1000 revs. or 200 revs., Judge corre-
sponding cylinders as NG.
As shown in the following figure, pick a cylinder as the standard and name it omg 0. And the former crank-
shaft position speed is named omg 1, the second former crankshaft position speed is named omg 2, the third
is named omg 3, etc.
Diagnostic value calculation
(Calculate from angle speed)
o
Misfire detection every single ignition
(Compare diagnostic value with judg-
ment value)
o
NG judgment (Misfire occurrence judg-
ment required by the law) (Compare
number of misfire with judgment)
• 180° Interval Difference Method
• 360° Interval Difference Method
• 720° Interval Difference Method
• FTP 1.5 times misfire NG judgment
• Catalyst damage misfire NG judgment
(A)
Ignition order
(B)
Crankshaft position speed
EN-01774
#3
#2
#4
#1
#3
#2
#4
#1
#3
#2
(A)
(B)
omg0
omg1
omg2
omg3
omg4
omg5
omg6
omg7
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