Suzuki Ignis Service Manual page 3301

6-100 ENGINE GENERAL INFORMATION AND DIAGNOSIS
Step
5 Check wire circuit.
1) Disconnect connectors from ECM with igni-
tion switch turned OFF.
2) Remove ECM from vehicle body and con-
nect connectors to ECM.
3) Measure resistance between "WHT" wire
terminal of HO2S–1 harness connector and
"C63-11" terminal.
Is resistance less than 5 Ω?
6 Check wire circuit.
1) Disconnect connectors from ECM with igni-
tion switch turned OFF.
2) Measure resistance between "WHT" wire
terminal of HO2S–1 sensor connector and
body ground.
Is resistance infinity?
7 Check HO2S–1 heater circuit.
1) Check HO2S–1 heater circuit, referring to
"DTC P0031 HO2S Heater Control Circuit
Low (Sensor-1) DTC P0032 HO2S Heater
Control Circuit High (Sensor-1)".
Is result in good condition?
8 Check exhaust system.
1) Check exhaust system for exhaust gas
leakage.
Is it OK?
9 Check air intake system.
1) Check air intake system for clog or leak.
Is it OK?
Action Yes
Go to Step 6.
Go to Step 7.
Go to Step 8.
Go to Step 4 in DTC
P0171 and P0172 diagno-
sis flow table.
If it is in good condition,
go to Step 9.
Check HO2S–1 sensor,
referring to "Heated oxy-
gen sensor (HO2S-1 and
HO2S-2) heater on-vehi-
cle inspection" in Section
6E1.
If it in good condition, sub-
stitute a known-good
ECM and recheck.
No
"WHT" wire high resis-
tance circuit or open cir-
cuit.
Poor "C63-11" terminal
connection.
Faulty ECM ground.
If they are OK, substitute
a known-good ECM and
recheck.
"WHT" wire shorted to
ground circuit.
Repair or replace it.
Repair exhaust system for
leakage.
Repair or replace.