Suzuki 2000 Grand Vitara SQ625 Service Manual page 89

DTC CONFIRMATION PROCEDURE
WARNING:
D 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.
D 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.
D Intake air temp.: –8_C, 18_F or higher
D Engine coolant temp.: –8 – 110_C (18 – 230_F)
D Altitude (barometric pressure): 2400 m, 8000 ft or less (560 mmHg, 75 kPa or more)
1) Connect scan tool to DLC with ignition switch OFF.
2) Turn ON ignition switch and clear DTC, pending DTC and freeze frame data by using scan tool.
3) Increase vehicle speed to 80 – 90 km/h (50 – 56 mph).
4) Keep above vehicle speed for 5 min. or more (Throttle valve opening is kept constant in this step).
5) Stop vehicle and check if DTC and pending DTC exists by using scan tool. If not, check if catalyst monitoring
test has completed by using scan tool. If not in both of above checks (i.e., no pending DTC and catalyst monitor-
ing test not completed), check vehicle condition (environmental) and repeat Step 3) through 5).
TROUBLESHOOTING
STEP
1 Was "ENGINE DIAG. FLOW TABLE" 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 Step 2
of DTC P0136 Diag. Flow Table.
Is check result satisfactory?
ACTION
ENGINE DIAGNOSIS (G16 / J20 ENGINES) 6-85
YES
Go to Step 2.
Go to Step 3.
Replace three way
catalytic converter.
NO
Go to "ENGINE DIAG.
FLOW TABLE".
Repair or replace.
Check "R/G" and "Gr/Y"
wires for open and
short, and connections
for poor connection.
If wires and connec-
tions are OK, replace
HO2S-2.