Suzuki WagonR+ RB310 Service Manual page 695

6-2-124 ENGINE GENERAL INFORMATION AND DIAGNOSIS (M13 ENGINE)
DTC Detecting Condition and Trouble Area
DTC Detecting Condition
• 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
✱
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 following conditions are satisfied when using this DTC CONFIRMATION PRO-
CEDURE.
• Intake air temp.: –7°C (19.4°F) or higher
• Engine coolant temp.: 70°C (158°F) or higher
• Altitude (barometric pressure): 2500 m, 8200 ft or less (540 mmHg, 72 kPa or more)
1) Connect scan tool to DLC with ignition switch turned OFF.
2) Turn ON ignition switch and clear DTC using scan tool.
3) Increase vehicle speed to 50 – 60 mph, 80 – 100 km/h. (engine speed: 2500 – 3000 r/min.)
4) Keep above vehicle speed for 10 min. or more (Throttle valve opening is kept constant in this step).
5) Stop vehicle and check if DTC/pending DTC exists using scan tool. If not, check if catalyst monitoring test
has completed using scan tool. If not in both of above checks (i.e., no DTC/pending DTC and catalyst moni-
toring test not completed), check vehicle condition (environmental) and repeat step 3) through 5).
Troubleshooting
Step
1 Was "Engine and Emission Control System
Check" performed?
2 Exhaust system visual inspection.
1) Check exhaust system for leaks, damage and
loose connection.
Is it in good condition?
3 HO2S–2 output voltage check.
1) Check output voltage of HO2S–2 referring to
DTC P0137 or P0138 Diag. Flow Table.
Is check result satisfactory?
Action
Trouble Area
• Exhaust gas leak
• Three way catalytic converter malfunction
• HO2S–2 malfunction
• HO2S–1 malfunction
Yes
Go to Step 2.
Go to Step 3.
Replace three way cata-
lytic converter.
No
Go to "Engine and
Emission Control Sys-
tem Check" in this sec-
tion.
Repair or replace.
Check "BLU" and
"BRN/WHT" wires for
open and short, and
connections for poor
connection.
If wires and connec-
tions are OK, replace
HO2S–2.