Suzuki Grand Vitara 2011 Manual page 143

Step
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: For Petrol Engine Model 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?
8 HO2S heater relay circuit check
1) Measure wire resistance between coil ground terminal of
relay connector and vehicle body ground.
Is measured resistance lower than 1
9 A/F sensor heater check
1) Check heater resistance of A/F sensor referring to "Air
Fuel Ratio (A/F) Sensor On-Vehicle Inspection: For
Petrol Engine Model in Section 1C".
Is A/F sensor heater in good condition?
Engine General Information and Diagnosis: For Petrol Engine Model 1A-74
Action
For J20 engine
1
For M16 engine
2
Ω
?
Yes
Go to Step 6.
I5JB0A110030-02
I5JB0A110031-03
Go to Step 7.
Go to Step 8.
Output wire of relay
connector is open or
short to ground.
Go to Step 10.
No
Power circuit is open.
Replace relay.
Repair or replace short
wire.
Repair or replace
defective circuit.
Replace A/F sensor.