Suzuki VL800 Supplementary Service Manual page 71

"C28" (P1655) STV ACTUATOR CIRCUIT MALFUNCTION
DETECTED CONDITION
The operation voltage does not reach the STVA.
ECM does not receive communication signal from
the STVA.
STV ACTUATOR
INSPECTION
Step 1
1) Remove the fuel tank. ($Page 93)
2) Turn the ignition switch OFF.
3) Check the STVA lead wire coupler for loose or poor contacts.
4) Remove the air intake pipe. ($Page 103)
5) Turn the ignition switch ON to check the STVA operation.
(STV operating order: 95% open → Full open → 95% open)
Is the operation OK?
YES Go to Step 2.
• Loose or poor contacts on the STVA coupler.
NO • Open or short circuit in the (P/W or Black) and
(B/Lg or Green) wires.
6) After repairing the trouble, clear the DTC using SDS tool.
($Page 39)
B
P
G
W/B
POSSIBLE CAUSE
• STVA malfunction.
• STVA circuit open or short.
• STVA motor malfunction.
B/Lg
P/W
G
B
1
1
VL800K5 ('05-MODEL) 69
ECM
STVA. 1B
STVA. 1A
STVA. 2B
STVA. 2A