Suzuki VLR1800 Service Manual page 168

1A-99 Engine General Information and Diagnosis:
Step
4 1) Turn the ignition switch OFF.
2) Connect the EXCVA position sensor coupler (1).
3) Disconnect the EXCVA motor coupler (2).
4) Measure the EXCVA position sensor output voltage at
EXCV fully closed position and fully opened position. To
set the EXCV to fully closed position, apply 12 V to the
terminals as follows.
Positive wire – P wire terminal
Negative wire – Gr wire terminal
5) Insert the needle pointed probes to the back side of the
EXCVA position sensor coupler ((+) Y – (–) W).
6) Turn the ignition switch ON.
7) Measure the EXCVA position sensor output voltage at
EXCV fully closed position.
Special tool
(A): 09900–25008 (Multi-circuit tester set)
(B): 09900–25009 (Needle pointed probe set)
Tester knob indication
Voltage ( )
EXCVA position sensor output voltage
EXCV is fully closed: 0.5 – 1.5 V
((+) Y – (–) W)
Action
2
1
(A)
(B)
Yes
Replace the ECM with a
known good one, and
inspect it again.
I823H1110164-01
I822H1110114-01
No
Go to Step 5.