Suzuki GRAND VITARA Owner's Manual page 122

1A-67 Engine General Information and Diagnosis:
Step
4 A/F sensor and HO2S heater resistance check
1) Disconnect connector from HO2S-2 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?
5 HO2S heater relay power circuit check
1) Remove integration relay No.2 (for J20 engine) (1) or
HO2S heater relay (for M16 engine) (2) with ignition
switch turned OFF.
2) Check for proper connection to relay connector.
3) If connection are OK, measure voltage between each
relay power terminal of relay connector and vehicle body
ground with ignition switch tuned ON.
Is each measured voltage 10 – 14 V?
6 Check HO2S heater relay
1) Check integration relay No.2 (for J20 engine) or HO2S
heater relay (for M16 engine) referring to "Control Relay
Inspection: in Section 1C".
Is it in good condition?
7 A/F sensor heater circuit check
1) Measure insulation resistance between heater terminals
of A/F sensor connector.
Is measured resistance infinity?
Action
For J20 engine
1
For M16 engine
2
Yes
Go to Step 6.
Go to Step 6.
I5JB0A110030-02
I5JB0A110031-03
Go to Step 7.
Go to Step 8.
No
Replace defective
sensor.
Power circuit is open.
Replace relay.
Repair or replace short
wire.