Speed sensor
Function
to indicate the vehicle speed by reading the rear
wheel turning speed
Operation / operating principle
Hall-effect sensor: a square-wave pulse is gener-
ated with voltage between 10 V and 0 V with metal
ground near the sensor V
Level in wiring diagram:
Speed sensor
Location:
•
sensor: on rear wheel fork, right side
•
connector: on right side rear frame
(three-way white connector)
Pin out:
1. Power supply voltage (12V)
2. Output signal
3. Ground connection
DIAGNOSIS INSTRUMENT: PARAMETERS
Vehicle speed:km/h
CAUTION
BEFORE CARRYING OUT ANY TROUBLESHOOTING,
CAREFULLY READ THE GENERAL TROUBLESHOOTING
CONCEPTS FOR ELECTRICAL DEVICES AT THE BEGIN-
NING OF THE CHECK AND CONTROL SECTION IN THE
ELECTRICAL SYSTEM CHAPTER.
WARNING
Sensor or its circuit malfunction are not detected by the control unit. In case of incorrect or missing
speed indication on the instrument panel, carry out troubleshooting indicated below.
Troubleshooting
Check the speed sensor connector, the engine-vehicle cable harness and the VEHICLE connector of
the Marelli control unit, specially at PIN 79: if not OK, restore; if OK, check, with sensor connector
disconnected, that there is continuity between PIN 3 and ground: if not, restore cable harness and if
there is continuity, check that, with key ON with sensor connector disconnected, there is voltage at PIN
1 (approximately 12 V) : if there is not voltage, set the key to OFF and check continuity between sec-
ondary fuse B and PIN 3 and if there is not continuity, restore cable harness; if there is voltage, set the
key to OFF and check that there is continuity between the VEHICLE connector PIN 79 and the sensor
PIN 2: if there is not continuity, restore the cable harness; if there is continuity, replace the sensor.
Electrical system RSV4 R
ELE SYS - 150
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