Yamaha SR400 2014 Service Manual page 256

CHECKING THE SPEED SENSOR .........................................................7-70
CHECKING THE THROTTLE POSITION SENSOR ................................7-70
CHECKING THE AIR INDUCTION SYSTEM SOLENOID .......................7-71
CHECKING THE INTAKE AIR PRESSURE SENSOR ............................7-71
CHECKING THE INTAKE AIR TEMPERATURE SENSOR .....................7-72
CHECKING THE FUEL INJECTOR .........................................................7-72