Suzuki Ignis Service Manual page 3309

6-108 ENGINE GENERAL INFORMATION AND DIAGNOSIS
TROUBLESHOOTING
Step
1 Was "Engine and Emission Control System
Check" performed?
2 Check HO2S–2 heater power circuit.
1) Disconnect connector from HO2S–2 sen-
sor with ignition switch turned OFF.
2) Check for proper connection to HO2S–2
sensor at "BLK/WHT" and "RED/BLU" wire
terminals.
3) If wire and connection are OK, measure
voltage between "BLK/WHT" wire terminal
of HO2S–2 sensor connector and engine
ground with ignition switch turned ON.
Is voltage over 10 V?
3 Check HO2S–2 heater power circuit.
1) Disconnect connectors from ECM with igni-
tion switch turned OFF.
2) Measure resistance between "BLK/WHT"
wire terminal of HO2S–2 sensor connector
and "G91-28" terminal wire of ECM connec-
tor.
Is resistance below 5 Ω?
4 Check HO2S–2 heater drive circuit.
1) Measure resistance between "RED/BLU"
wire terminal of HO2S–2 sensor connector
and vehicle body ground.
Is resistance infinity?
5 Check HO2S–2 heater drive circuit.
1) Turn ON ignition switch.
2) Measure voltage between "RED/BLU" wire
terminal of HO2S–2 sensor connector and
vehicle body ground.
Is voltage 0 V?
6 Check HO2S–2 heater drive circuit.
1) Connect connector to HO2S–2 with ignition
switch turned OFF.
2) Turn ON ignition switch.
3) Measure voltage between "C64-3" wire ter-
minal of disconnected ECM connector and
vehicle body ground.
Is voltage over 10 V?
7 Check heater of sensor–2.
1) Disconnect HO2S–2 coupler with ignition
switch turned OFF.
2) If OK, then check heater resistance.
Is it 11.7 – 14.3 Ω at 20°C, 68°F?
Action Yes
Go to Step 2.
Go to Step 3.
Go to Step 4.
Go to Step 5.
Go to Step 6.
Go to Step 7.
Go to Step 8.
No
Go to "Engine and Emis-
sion Control System
Check" in this section.
"BLK/WHT" wire open cir-
cuit or shorted to ground
circuit.
"BLK/WHT" wire high
resistance circuit.
"RED/BLU" wire shorted
to ground circuit.
"RED/BLU" wire shorted
to power circuit.
"RED/BLU" wire open cir-
cuit.
Replace HO2S–2.