Suzuki VLR1800, Service Manual

Page: 122 / 624

1A-53 Engine General Information and Diagnosis:
C21 (Use of mode select switch)
Step Action Yes No
1 1) Turn the ignition switch OFF.
2) Remove the fuel tank. Refer to “Fuel Tank Removal and
Installation in Section 1G (Page 1G-8)”.
3) Check the IAT sensor coupler (1) for loose or poor
contacts.
If OK, then measure the IAT sensor input voltage.
4) Disconnect the IAT sensor coupler and turn the ignition
switch ON.
5) Measure the input 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)
Tester knob indication
Voltage (
)
IAT sensor input voltage
4.5 – 5.5 V
((+) terminal: Dg – (–) terminal: Ground, (+) terminal:
Dg – (–) terminal: B/Br)
Is the voltage OK?
Go to Step 2. • Loose or poor
contacts on the ECM
coupler.
• Open or short circuit
in the Dg or B/Br
wire.
1
I822H1110038-01
(A)
I822H1110039-01