Suzuki Liana RH413, Service Manual

Page: 139 / 1302

Engine General Information and Diagnosis: 1A-88
DTC Detecting Condition and Possible Cause
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 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
procedure.
• Altitude (barometric pressure): 2400 m, 8000 ft or less (560 mmHg, 75 kPa or more)
• Ambient temp.: –10
°
C, 14
°
F or higher
• Intake air temp.: 70
°
C, 158
°
F or lower
• Engine coolant temp.: 70 – 110
°
C, 158 – 230
°
F
1) Turn ignition switch OFF. Clear DTC with ignition switch ON.
2) Start engine and drive vehicle at 55 – 65 km/h, 35 – 45 mph for 8 min. or longer.
While this driving, if “Catalyst Monitoring TEST COMPLETED” is displayed in “READINESS TESTS” mode and
DTC is not displayed in “DTC” mode, confirmation test is completed.
If “TEST NOT COMPLETE” is still being displayed, continue test driving.
3) Decrease vehicle speed at 50 – 60 km/h, 30 – 40 mph, and hold throttle valve at that opening position for 2 min.
and confirm that short term fuel trim vary within –20% – +20% range.
4) Stop vehicle (do not turn ignition switch OFF) and confirm test results according to the following “Test Result
Confirmation Flow”.
DTC detecting condition Possible cause
• While vehicle running at constant speed under other than high load.
• Time from rich or lean switching command is output till HO2S-2 output
voltage crosses 0.45 V is less than specified value.
*2 driving cycle detection logic, monitoring once / 1 driving
• Exhaust gas leak
• Three way catalytic converter
malfunction
• Fuel system malfunction
• HO2S-2 malfunction
• HO2S-1 malfunction
I2RH0B110059-01