• Measure the sensor input voltage with the engine stopped, and with the connector joined.

• Turn the ignition switch ON.

Input Voltage at Sensor

Standard: About 9 - 11 V DC at Ignition SW ON

• If the reading is out of the range, check the wiring (see wiring diagram in this section), and meter (see Electrical System chapter).

• If the reading is good, check the output voltage.

• Turn the ignition switch OFF.

Output Voltage Inspection

• Before this inspection, inspect the input voltage (see Input Voltage Inspection).

NOTE

O Be sure the battery is fully charged.

• Turn the ignition switch OFF.

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Speed Sensor (Service Code 24, 25)

• Disconnect the speed sensor connector [A] and connect the harness adapter [B] between the harness connector and speed sensor connector.

• Connect a digital meter to the harness adapter leads. Special Tool - Throttle Sensor Setting Adapter:

57001-1400

Throttle Sensor Output Voltage Connections to Sensor Meter (+) -> Y lead [C]

Meter (-) -» BK lead [D]

• Measure the sensor output voltage with the engine stopped, and with the connector joined.

• Turn the ignition switch ON.

Output Voltage at Sensor

Standard: About 0.05 ~ 0.07 V DC

NOTE

o If you can rotate the engine sprocket, the output voltage will be raise.

• If the reading is out of the range, check the speed sensor (see Electrical System chapter) and the wiring to ECU (see wiring diagram in this section).

• If the reading, speed sensor and wiring are good, replace the ECU.

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Speed Sensor (Service Code 24, 25)

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This sensor has a weight [A] with two magnets inside, and sends a signal to the ECU. But when the motorcycle banks 60 - 70 or more to either side (in fact falls down), the weight turns and shuts off the signal. The ECU senses this change, and stops the fuel pump, the fuel injectors, and the ignition system.

Hall IC [B]

When the motorcycle is down, the ignition switch is left ON. If the starter button is pushed, the electric starter turns but the engine doesn’t start. To start the engine again, raise the motorcycle, turn the ignition switch OFF, and then ON. When the ignition switch is turned ON, current flows through the latch-up circuit and the transistor in the circuit is turned ON to unlock the latch-up circuit.

Vehicle-down Sensor [A]

Ground Terminal BK/Y [B]

Output Terminal Y/G [C]

Power Source Terminal W/Y [D]

Removal

CAUTION

Never drop the down-sensor, especially on a hard surface. Such a shock to the sensor can damage it.

• Remove:

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 brackets. ^{* •}

Inspection

NOTE

O Be sure the battery is fully charged.

• Remove:

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