Suzuki GSF650A Service Manual page 182

1A-107 Engine General Information and Diagnosis:
Step
2 1) Connect the ECM coupler and HO2 sensor coupler.
2) Warm up the engine enough.
3) Insert the needle pointed probes to the lead wire coupler.
4) Measure the HO2 sensor output voltage between the W/
G wire and B/Br wire, when idling condition.
Special tool
(A): 09900–25008 (Multi-circuit tester set)
(B): 09900–25009 (Needle pointed probe set)
Tester knob indication
Voltage ( )
HO2 sensor output voltage at idle speed
0.3 V and less
((+) terminal: W/G – (–) terminal: B/Br)
(B)
5) If OK, then pinch the PAIR hose (1) with a proper hose
clamp.
6) Measure the HO2 sensor output voltage while holding
the engine speed at 3 000 r/min.
HO2 sensor output voltage at 3 000 r/min
0.6 V and more
((+) terminal: W/G – (–) terminal: B/Br)
Is the voltage OK?
Action
(A)
I718H1110230-02
1
I718H1110225-01
Yes
• W/G or B/Br wire
open or shorted to
the power source, or
poor 12 or 29
connection.
• If wire and
connection are OK,
intermittent trouble or
faulty ECM.
• Recheck each
terminal and wire
harness for open
circuit and poor
connection.
• Replace the ECM
with a known good
one, and inspection it
again. Refer to "ECM
Removal and
Installation in Section
1C (Page 1C-1)".
No
Replace the HO2
sensor with a new one.
Refer to "Heated
Oxygen Sensor (HO2S)
Removal and
Installation in Section
1B (Page 1B-5)".