Dtc P0300 Random Misfire Detected; Dtc P0301 Cylinder 1 Misfire Detected; Dtc P0302 Cylinder 2 Misfire Detected; Dtc P0303 Cylinder 3 Misfire Detected - Suzuki WagonR+ RB310 Service Manual

6-2-108 ENGINE GENERAL INFORMATION AND DIAGNOSIS (M13 ENGINE)

DTC P0300 Random Misfire Detected

DTC P0301 Cylinder 1 Misfire Detected

DTC P0302 Cylinder 2 Misfire Detected

DTC P0303 Cylinder 3 Misfire Detected

DTC P0304 Cylinder 4 Misfire Detected

SYSTEM DESCRIPTION
ECM measure the angle of the crankshaft based on the pulse signal from the CKP sensor and CMP sensor for
each cylinder. If it detects a large change in the angle speed of the crankshaft, it concludes occurrence of a mis-
fire. When the number of misfire is counted by ECM beyond the DTC detecting condition, it determine the cylin-
der where the misfire occurred and output it as DTC.
DTC Detecting Condition and Trouble Area
DTC Detecting Condition
P0300
• Misfire, which causes catalyst to overheat during 200
engine revolutions, is detected at 2 or more cylinders.
(MIL flashes as long as this misfire occurs continu-
ously.)
or
• Misfire, which affects exhaust emission adversely
during 1000 engine revolution, is detected at 2 or
more cylinders. (2 driving cycle detection logic)
P0301, P0302, P0303, P0304
• Misfire, which causes catalyst to overheat during 200
engine revolutions, is detected at 1 cylinder. (MIL
flashes as long as this misfire occurs continuously.)
or
• Misfire, which affects exhaust emission adversely
during 1000 engine revolution, is detected at 1 cylin-
der. (2 driving cycle detection logic)
DTC Confirmation Procedure
WARNING:
• When performing a road test, select a place where there is no traffic or possibility of a traffic acci-
dent and very careful during testing to avoid occurrence of an accident.
• Road test should be carried out with 2 person, a driver and tester, on a level road.
NOTE:
Check to make sure that the following conditions are satisfied when using this DTC CONFIRMATION
PROCEDURE.
• Intake air temp.: –7°C, 19.4°F or higher
• Engine coolant temp.: –10°C (14°F) or higher
• Altitude (barometric pressure): 2500 m, 8200 ft or less (540 mmHg, 72 kPa or more)
Trouble Area
• Ignition system
• Fuel injector and its circuit
• Fuel pressure
• EGR system
• Abnormal air drawn in
• Engine compression
• Valve lash adjuster
• Valve timing
• Fuel shortage