Suzuki GRAND VITARA Owner's Manual page 125

DTC Troubleshooting
NOTE
Before this trouble shooting is performed, read the precautions for DTC troubleshooting referring to
"Precautions For DTC Troubleshooting: ".
Step
1 Was "Engine and Emission Control System Check"
performed?
2 HO2S-2 heater circuit check
1) Disconnect connector from HO2S-2 with ignition switch
turned OFF.
2) Check for proper connection to HO2S-2 connector.
3) If connection are OK, measure voltage between heater
power terminal of HO2S-2 connector and vehicle body
ground with ignition switch turned ON.
Is measured voltage 10 – 14 V?
3 HO2S heater fuse check
1) Check for "O2 HTR" fuse (1) blown.
Is "O2 HTR" fuse in good condition?
4 A/F sensor and HO2S heater resistance check
1) Disconnect connector from A/F sensor with ignition
switch turned OFF.
2) Check heater resistance of A/F sensor and HO2S
referring to "Air Fuel Ratio (A/F) Sensor On-Vehicle
Inspection: in Section 1C" and "Heated Oxygen Sensor
(HO2S-2) Heater On-Vehicle Inspection: in Section 1C".
Are A/F sensor heater and HO2S heater in good condition?
Action
For J20 engine
1
For M16 engine
1
Engine General Information and Diagnosis:
Yes
Go to Step 2.
Go to Step 9.
Go to Step 5.
I5JB0A110028-02
I5JB0A110029-02
Go to Step 6.
1A-70
No
Go to "Engine and
Emission Control
System Check: ".
Go to Step 3.
Go to Step 4.
Replace defective
sensor.