Subaru LEGACY 2006 Manual page 534

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Diagnostic Trouble Code (DTC) Detecting Criteria
Map 3
MT (Vehicle speed < 64.4km/h (40 MPH))
rpm 650 1000
kPa 25.6 23.1
(mmHg, (192, (173,
inHg) 7.56) 6.82)
MT (Vehicle speed ≥ 64.4km/h (40 MPH))
rpm 650 1000
kPa 31.6 31.6
(mmHg, (237, (237,
inHg) 9.33) 9.33)
AT
rpm 700 1000
kPa 25.6 24.4
(mmHg, (192, (183,
inHg) 7.56) 7.21)
3. GENERAL DRIVING CYCLE
• Detect misfires from idling to high rpm.
• Perform the diagnosis continuously.
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 rpm or 2000 rpm, judge correspond-
ing cylinders as NG.
Diagnostic value Misfire detection every
calculation single ignition
→
(Calculate from (Compare diagnostic
angle speed) value with judgment
value)
• 180° Interval Differ-
ence Method
• 360° Interval Differ-
ence Method
• 720° Interval Differ-
ence Method
1500 2000 2500 3000 3500
20.0 20.0 20.0 21.6
(150, (150, (150, (162, (198.,
5.91) 5.91) 5.91) 6.38) 7.80)
1500 2000 2500 3000 3500
31.6 31.1 31.3 33.1
(237, (233, (235, (248, (254,
9.33) 9.19) 9.24) 9.78) 10.01)
1500 2000 2500 3000 3500
22.0 22.4 22.8 23.9
(165, (168, (171, (179, (224,
6.50) 6.62) 6.73) 7.06) 8.83)
NG judgment (Misfire occurrence judg-
ment required by the law) (Compare
→
number of misfire with judgment)
• FTP1.5 times misfire NG judgment
• Catalyst damage misfire NG judgment
GD(H4SO)-97
4000 4500 5000 5500
26.4 28.0 29.5 32.4 36.4
(210, (221, (243, (273,
8.27) 8.71) 9.57) 10.75)
4000 4500 5000 5500
33.9 28.8 30.1 33.3 36.9
(216, (226, (250, (277,
8.51) 8.89) 9.84) 10.90)
4000 4500 5000 5500
29.9 31.3 29.9 35.6 39.3
(235, (244, (267, (295,
9.24) 8.83) 10.51) 11.61)
GENERAL DESCRIPTION
6000 6400
39.9 44.5
(299, (324,
11.78) 13.14)
6000 6400
40.1 44.5
(301, (324,
11.84) 13.14)
6000 6400
43.3 44.5
(325, (334,
12.79) 13.14)