Vehicle-down Sensor (Service Code 31)
Vehicle-down Sensor Removal
Never drop the down-sensor, especially on a hard
surface. Such a shock to the sensor can damage it.
Connection and Vehicle-down Sensor [B]
Vehicle-down Sensor Installation
The UP mark [A] of the sensor should face upward.
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 the sensor
Vehicle-down Sensor Inspection
Be sure the battery is fully charged.
Connect a digital volt meter [C] to the connector [B] of the
vehicle-down sensor [A] with the needle adapter set [D].
Vehicle-down Sensor Power Source Voltage
Connections to Sensor
Meter (+) → BL lead [D]
Meter (–) → BR/BK lead [E]
Turn the ignition switch ON, and measure the power
source voltage with the connector joined.
Vehicle-down Sensor Input Voltage
4.75 ∼ 5.25 V DC
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
If the power source is normal, check the output voltage.
FUEL SYSTEM (DFI) 3-57