Subaru 2009 IMPREZA, Руководство по обслуживанию

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GD(H4SO)-78
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 CONDITIONS
Secondary Parameters Enable Condition
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 of 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