Engine cooling symptom diagnosis

Schematic and routing diagramDTC “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.
...
Precautions
Precautions for suspension
Refer to “general precautions” in section 00 (page 00-1).
All
suspensions, bolts and nuts are an important part in that it could
affect the performance of vital
parts. They must be tightened to the specified torque periodically and
if the suspension ...
Turn signal / side-stand relay removal and installation
Removal
Remove the frame cover. Refer to “exterior parts
removal and installation” in section 9d (page 9d-
6).
Remove the turn signal/side-stand relay (1).
Installation
Install the turn signal/side-stand relay in the reverse
order of removal. ...