3-70 FUEL SYSTEM (DFI)
Vehicle-down Sensor (Service Code 31)
Vehicle-down Sensor Removal
Tool Box (see Tool Box Removal in the Frame chapter)
Vehicle-down Sensor [B]
Connector [C] (Disconnect)
Vehicle-down Sensor Installation
Install the vehicle-down sensor [A] in the original position.
The arrow mark [B] on the sensor must be on the rear and
Do not install the sensor upside down.
Torque - Vehicle-down Sensor Bolts [C]: 1.0 N·m (0.10
kgf·m, 8.9 in·lb)
Incorrect installation of the vehicle-down sensor
could cause sudden loss of engine power. The
rider could lose balance during certain riding situ-
ations, like leaning over in a turn, with the potential
for an accident resulting in injury or death. Ensure
that the down sensor is held in place by its bolt as
shown in the figure.
Vehicle-down Sensor Inspection
Be sure the battery is fully charged.
Take out the vehicle-down sensor [A] (see Vehicle-down
Sensor Removal). Do not disconnect the connector [B].
Connect a digital meter [C] to the connector, using the
needle adapter set [D].
Special Tool - Needle Adapter Set: 57001-1457
Turn the ignition switch ON, and measure the power
source voltage with the connector joined.
Vehicle-down Sensor Power Source Voltage
Connections to Sensor
Meter (+) → BL lead [E]
Meter (–) → BR/BK lead [F]
DC 4.75 ∼ 5.25 V
Turn the ignition switch OFF.
If the reading of input voltage is less than the standard,
check the ECU for its ground, power supply and wiring