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Diagnostic Trouble Code (DTC) Detecting Criteria
AS: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 three 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
Intake manifold pressure change during
0.5 engine revs.
Engine speed change
Throttle position change during 16 milli-
seconds
Fuel shut-off function
Atmospheric pressure
Fuel level
Evaporative system leak check
Engine speed
Intake manifold pressure
Battery voltage
Continuous time of establishing all sec-
ondary parameter conditions
Map 3
Vehicle speed < 64.4 km/h (40 MPH)
rpm
700
1,000
kPa
25.1
24.8
(mmHg,
(188,
(186,
inHg)
7.40)
7.32)
Vehicle speed ≥ 64.4 km/h (40 MPH)
rpm
700
1,000
kPa
25.1
24.8
(mmHg,
(188,
(186,
inHg)
7.40)
7.32)
3. GENERAL DRIVING CYCLE
• If conditions are met, it is possible to detect the misfires from idling to high engine speed. However, in case
any engine load or breakage occurs, perform with the engine at idle.
• Perform the diagnosis continuously.
Enable Conditions
< 13.3 kPa (99.8
mmHg, 3.93 inHg)
< 500 rpm/32 millisec-
onds
< 14°
Not in operation
≥ 75.1 kPa (563
mmHg, 22.2 inHg)
≥ 9 2 (2.38 US gal,
1.98 Imp gal)
Not in operation
550 — 6,900 rpm
>Value from Map 3
≥ 8 V
≥ 1 second
1,500
2,000
2,500
3,000
3,500
23.3
24.7
24.0
25.6
(175,
(185,
(180,
(192,
6.88)
7.30)
7.09)
7.56)
1,500
2,000
2,500
3,000
3,500
25.6
38.3
39.3
38.9
(192,
(287,
(295,
(292,
7.56)
11.3)
11.6)
11.5)
GD(STI)-101
4,000
4,500
5,000
5,500
28.8
30.0
31.6
32.5
(216,
(225,
(237,
(244,
(278,
8.51)
8.86)
9.33)
9.60)
11.0)
4,000
4,500
5,000
5,500
38.5
37.6
39.7
44.3
(289,
(282,
(298,
(332,
(332,
11.4)
11.1)
11.7)
13.1)
13.1)
GENERAL DESCRIPTION
6,000
6,500
6,700
37.1
41.9
46.9
51.1
(314,
(352,
(383,
12.4)
13.9)
15.1)
6,000
6,500
6,700
44.3
44.3
47.0
51.1
(332,
(352.5
(383,
13.1)
, 13.9)
15.1)
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