Yamaha XT660Z 2008 Service Manual page 326

CHECKING THE COOLANT TEMPERATURE SENSOR........................8-57
CHECKING THE FUEL SENDER ............................................................8-58
CHECKING THE SPEED SENSOR.........................................................8-58
CHECKING THE THROTTLE POSITION SENSOR................................8-59
CHECKING THE FUEL PUMP.................................................................8-59
CHECKING THE INTAKE AIR PRESSURE SENSOR ............................8-60
CHECKING THE INTAKE AIR TEMPERATURE SENSOR .....................8-60
CHECKING THE RADIATOR FAN MOTOR ............................................8-60
CHECKING THE STARTER MOTOR ......................................................8-61