DTC “c28” (p1655): secondary throttle
valve actuator (stva) malfunction
Detected condition and possible cause
Detected condition
Possible cause
The operation voltage does not reach the stva.
Ecm does not receive communication signal from the
stva. Stva can not operate properly or its motor locked
Stva malfunction.
...
Front footrest bracket construction
Footrest bracket bolt
Rear brake master cylinder mounting bolt
Footrest guard bolt
Footrest bracket no. 1 (Lh)
Footrest bracket no. 1 (Rh)
Footrest
Footrest holder
Rear brake pedal
Footrest bracket no. 2 (Lh)
Footrest bracket no. 2 (Rh)
Ban ...
Engine top side disassembly
It is unnecessary to remove the engine assembly from
the frame when servicing the cylinder head cover and
camshafts.
Note
before servicing the engine top side
components (until camshafts removal) with
the engine in place, remove the following
parts:
air cleaner box
...