Suzuki Wagon R Plus RB310 Service Manual page 272

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 "RED" wire
terminal of HO2S–1 harness connector and
"E22-11" terminal.
Is resistance less than 5
6 Check wire circuit.
1) Disconnect connectors from ECM with igni-
tion switch turned OFF.
2) Measure resistance between "RED" 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 and P0032 diagnosis flow table.
Is result in good condition?
8 Check exhaust system.
1) Check exhaust system for exhaust gas leak-
age.
Is it OK?
9 Check air intake system.
1) Check air intake system for clog or leak.
Is it OK?
ENGINE GENERAL INFORMATION AND DIAGNOSIS (M13 ENGINE) 6-2-97
Action
Ω
?
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-
Vehicle Inspection" in
Section 6E2.
If it in good condition, sub-
stitute a known-good
ECM and recheck.
No
"RED" wire high resis-
tance circuit or open cir-
cuit.
Poor "E22-11" terminal
connection.
Faulty ECM ground.
If they are OK, substitute
a known-good ECM and
recheck.
"RED" wire shorted to
ground circuit.
Repair or replace it.
Repair exhaust system for
leakage.
Repair or replace.