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.
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Radiator reservoir tank inspection
Inspect the radiator reservoir tank in the following
procedures:
remove the right side cowling. Refer to “exterior parts removal and
installation” in section 9d .
Inspect the radiator reservoir tank (1) for leaks. If any
defects are found, replace the radiator reservoir tank
...
Generator removal and installation
Removal
Drain engine oil. Refer to “engine oil and filter replacement” in
section 0b .
Remove the left side cowling. Refer to “exterior parts removal and
installation” in section 9d .
Disconnect the generator coupler (1).
Remove the generator cover (2).
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