Speed Sensor Removal/Installation
- Refer to the Speed Sensor Removal/Installation in the Electrical System chapter.
Speed Sensor Inspection
- Refer to the Speed Sensor Inspection in the Electrical System chapter.
Speed Sensor Input Voltage Inspection
Note: Be sure the battery is fully charged.
- Turn the ignition switch OFF.
- Disconnect the speed sensor connector [A] and connect the harness adapter [B] between the harness connector and speed sensor connector.
Special Tool - Throttle Sensor Setting Adapter #1: 57001 -1400
- Connect a digital meter to the harness adapter leads.
Speed Sensor Input Voltage
Connections to Adapter
- Meter (+) → BL (sensor P) lead [C]
- Meter (-) → BK/BL (sensor BK) lead [D]
- Measure the input voltage with the engine stopped, and with the connector joined.
- Turn the ignition switch ON.
Input Voltage at Sensor
Standard: About DC 9-11 V at Ignition Switch ON
- Turn the ignition switch OFF.
If the reading is out of the range, check the wiring (see wiring diagram in this section), and meter unit (see Meter Unit Inspection in the Electrical System chapter).
If the reading is good, check the output voltage.
Speed Sensor Output Voltage Inspection
- Before this inspection, inspect the input voltage (See Speed Sensor Input Voltage Inspection).
Note: Be sure the battery is fully charged.
- Turn the ignition switch OFF.
- Disconnect the speed sensor connector [A] and connect the harness adapter [B] between the harness connector and speed sensor connector.
Special Tool - Throttle Sensor Setting Adapter #1: 57001 -1400
- Connect a digital meter to the harness adapter leads.
Speed Sensor Output Voltage at Sensor Connections to Adapter
- Meter (+) → Y/W (sensor Y) lead [C]
- Meter (-) → BK/BL (sensor BK) lead [D]
- Measure the output voltage with the engine stopped, and with the connector joined.
- Turn the ignition switch ON.
Input Voltage at Sensor Connector
Standard: About DC 0.05-0.07 V or DC 4.5-4.9 V
Note: Rotate the rear wheel by hand, confirm the output voltage will be raise or lower.
- Turn the ignition switch OFF.
If the reading is out of the range, check the speed sensor (See Speed Sensor Inspection in the Electrical System chapter) and the wiring to ECU (see wiring diagram in this section).
If the reading, speed sensor and wiring are good, check the ECU for its ground, and power supply (See ECU Power Supply Inspection).
If the ground and power supply are good, replace the ECU (See ECU Removal/Installation).
Speed Sensor Circuit
1. ECU; 2. Speed Sensor; 3. Meter Unit; 4. Water-proof Joint B; 5. Frame Ground; 6. Joint Connector