Inspect the camshaft sprocket in the following procedures:
If they are worn or damaged, replace the sprocket/ camshaft assembly and cam chain as a set.

Camshaft inspection
Cam chain tension adjuster inspectionSpecifications
Service data
Electrical
unit: mm
Caution
never use anything except the specified battery.
Tightening torque specifications
Note
the specified tightening torque is described in the following.
“Regulator / rectifier construction”
Reference: for the tig ...
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.
...
Battery removal and installation
Removal
Remove the front seat. Refer to “exterior parts
removal and installation” in section 9d (page 9d-
6).
Disconnect the battery (–) lead wire (1).
Disconnect the battery (+) lead wire (2).
Note
be sure to disconnect the battery (–) lead
wire (1) first, th ...