Suzuki GW250 Service Manual page 213

4-72 FI SYSTEM DIAGNOSIS
Step 1
HO2 sensor heater power supply circuit check
1) Turn the ignition switch OFF.
2) Disconnect the HO2 sensor coupler 1. (4-93)
3) Check for proper terminal connection to the HO2 sensor cou-
pler.
4) If connections are OK, turn the ignition switch ON.
5) Measure the voltage between O/W wire and ground.
 09900-25008: Multi circuit tester set
 Tester knob indication: Voltage ()
 HO2 sensor heater power supply voltage:
Battery voltage
(+ terminal: O/W – - terminal: Ground)
Is check result OK?
YES Go to Step 2.
NO Repair or replace the O/W wire.
Step 2
HO2 sensor circuit check
1) Turn the ignition switch OFF.
2) Remove the seat. (8-5)
3) Disconnect the ECM couplers 1.
1
1
2