Suzuki Engine 2002 GRAND VITARA SQ625, Service Manual

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ENGINE GENERAL INFORMATION AND DIAGNOSIS (G16/J20 ENGINES) 6-101
DTC CONFIRMATION PROCEDURE
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
monitoring test not completed), check vehicle condition (environmental) and repeat Step 3) through 5).
TROUBLESHOOTING
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
Procedure”.
• Intake air temp. : –8°C, 18°F or higher
• Engine coolant temp. : –8 – 110°C (18 – 230°F)
• Altitude (barometric pressure) : 2400 m, 8000 ft or less (560 mmHg, 75 kPa or more)
Step Action Yes No
1 Was “Engine Diag. Flow Table” performed? Go to Step 2. Go to “Engine Diag. Flow
Table”.
2 Exhaust System Visual Inspection :
1) Check exhaust system for leaks, damage
and loose connection.
Is it in good condition?
Go to Step 3. Repair or replace.
3 HO2S-2 Output Voltage Check :
1) Check output voltage of HO2S-2 referring to
Step 2 of “DTC P0136 Diag. Flow Table” in
this section.
Is check result satisfactory?
Replace three way cata-
lytic converter. Check “RED/GRN” (Can-
vas Top model), “RED/
BLU” (other than Canvas
Top model) and “GRY/
YEL” wires for open and
short, and connections for
poor connection.
If wires and connections
are OK, replace HO2S-2.