Suzuki SY413 Service Manual page 2780

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 misfire.
When the number of misfire is counted by ECM beyond the DTC detecting condition, it determine the cylinder
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 continuously.)
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.)
Misfire, which affects exhaust emission adversely during 1000
engine revolution, is detected at 1 cylinder.
(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 be very careful during testing to avoid occurrence of an accident.
Road test should be carried out with 2 persons, a driver and a tester, on a level road.
NOTE:
Check to make sure that the following conditions are satisfied when using this DTC CONFIRMATION PRO-
CEDURE.
Intake air temp.: –75C (17.45F) or higher
Altitude (barometric pressure): 2400m, 8000 ft or less (560 mmHg 75 kPa or more)
1) With ignition switch OFF, connect scan tool.
2) Turn ON ignition switch and clear DTC using scan tool.
3) Drive vehicle under freeze frame data condition as noted for 1 min. or more.
4) Stop vehicle and check DTC and pending DTC.
ENGINE GENERAL INFORMATION AND DIAGNOSIS (J18 ENGINE WITH WU TWC) 6-2-63
TROUBLE AREA
Ignition system
Fuel injector and its circuit
Fuel pressure
EGR system
Fuel level sensor
Abnormal air drawn in
Engine compression
Valve lash adjuster
Valve timing