3-56 FUEL SYSTEM (DFI)
Speed Sensor (Service Code 24, 25)
Disconnect the speed sensor connector and connect the
harness adapter [A] between the harness connector and
speed sensor connector.
Connect a digital meter to the harness adapter leads.
Special Tool - Throttle Sensor Setting Adapter #1: 57001
Measure the sensor output voltage with the engine
stopped, and with the connector joined.
Turn the ignition switch ON.
Speed Sensor Output Voltage at Sensor
Connections to Adapter
Meter (+) → Y/W (sensor LG/R) lead [C]
Meter (–) → BK (sensor BK/Y) lead [D]
About 0.05 ∼ 0.07 V DC
If you rotate the engine sprocket, the output voltage will
If the reading is out of the range, check the speed sensor
operation (see Speed Sensor Inspection in the Electrical
System chapter) and the wiring to ECU (see wiring dia-
gram in this section).
If the reading, speed sensor operation and wiring are
good, check the ECU for its ground, and power supply
(see ECU Power Supply Inspection).
Speed Sensor Circuit
2. Speed Sensor
3. Meter Unit
4. Water-proof Joint B
5. Frame Ground
6. Joint Connector