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.
...
Starter motor runs but does not crank the
engine
The starter motor runs when the transmission is in neutral, but does not run
when the transmission is in any position
other than neutral, with the side-stand up.
Step
Action
Yes
No
1
Check the side-stand switch. Refer to “side-stand / ignition
inte ...
Water pump disassembly and assembly
Refer to “water pump removal and installation” .
Disassembly
Remove the air bleeder bolt (1) if necessary.
Remove the water pump case screws.
Remove the o-ring (2).
Hold the impeller (3) with water pump pliers and
remove the impeller securing bolt (4).
Remove t ...