Suzuki GSF650A Service Manual page 138

1A-63 Engine General Information and Diagnosis:
C21 (Use of mode select switch)
Step
1 1) Turn the ignition switch OFF.
2) Check the IAT sensor coupler for loose or poor contacts.
If OK, then measure the IAT sensor input voltage.
3) Disconnect the IAT sensor coupler and turn the ignition
switch ON.
4) Insert the needle pointed probes to the lead wire coupler.
5) Measure the voltage between the Dg wire terminal and
ground.
If OK, then measure the input voltage between the Dg
wire terminal and B/Br wire terminal.
Special tool
(A): 09900–25008 (Multi-circuit tester set)
(B): 09900–25009 (Needle pointed probe set)
Tester knob indication
Voltage ( )
IAT sensor input voltage
4.5 – 5.5 V
((+) terminal: Dg – (–) terminal: Ground, (+) terminal:
Dg – (–) terminal: B/Br)
(B)
Is the voltage OK?
Action
I717H1110018-01
(A)
I718H1110057-04
Yes
Go to Step 3.
No
• Loose or poor
contacts on the ECM
coupler.
• Open or short circuit
in the Dg or B/Br
wire.