Suzuki SWIFT RS415 2017, Service Manual

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Engine General Information and Diagnosis: 1A-105
DTC P0300 / P0301 / P0302 / P0303 / P0304: Random Misfire Detected / Cylinder 1 / Cylinder 2 /
Cylinder 3 / Cylinder 4 Misfire Detected
S4RS0A1104033
System Description
ECM measures 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 misfire. When
the number of misfire is counted by ECM beyond the DTC detecting condition, it determines the cylinder where the
misfire occurred and output it as DTC.
DTC Detecting Condition and Trouble Area
DTC Confirmation Procedure
WARNING:
• When performing a road test, select a place where there is no traffic or possibility of a traffic
accident and be very careful during testing to avoid occurrence of an accident.
• Road test should be carried out by 2 persons, a driver and a tester, on a level road.
NOTE:
Check to make sure that following conditions are satisfied when using this “DTC Confirmation
Procedure”.
• Intake air temp.: –7
q
C, 19.4
q
F or higher
• Engine coolant temp.: –10
q
C, 14
q
F or higher
• Altitude (barometric pressure): 2500 m, 8200 ft or less (540 mmHg, 72 kPa or more)
1) With ignition switch turned OFF, connect scan tool.
2) Turn ON ignition switch and print freeze frame data or write them down using scan tool.
3) Clear DTC using scan tool.
4) Drive vehicle under condition as noted freeze frame data for 1 min. or more.
5) Stop vehicle and check DTC and pending DTC.
DTC detecting condition Trouble area
DTC 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 continuously.)
or
• Misfire, which affects exhaust emission adversely during 1000 engine revolution, is
detected at 2 or more cylinders. (2 driving cycle detection logic)
• Ignition system
• Fuel injector and its circuit
• Fuel pressure
• EGR system
• Abnormal air drawn in
• Engine compression
• Valve lash adjuster
• Valve timing
• Fuel shortage
DTC 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 cylinder. (2 driving cycle detection logic)