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Pair system hose routing diagramDTC “c40” (p0505 / p0506 / p0507): isc
valve circuit malfunction
Detected condition and possible cause
Detected condition
Possible cause
C40/P0505
The circuit voltage of motor drive is
unusual.
Isc valve circuit open or shorted to ground.
Air passage clogged.
Isc valve is fixed.
Isc valve prese ...
Cylinder head related parts inspection
Refer to “cylinder head disassembly and assembly” .
Cylinder head distortion
Decarbonize the combustion chambers.
Check the gasket surface of the cylinder head for
distortion. Use a straightedge and thickness gauge.
Take clearance readings at several places. If
readings exceed the ...
Engine stop switch inspection
Inspect the engine stop switch in the following
procedures:
turn the ignition switch off.
Remove the air cleaner box. Refer to “air cleaner box removal and
installation” in section 1d .
Disconnect the right handlebar switch coupler (1).
Inspect the engine stop ...