Toro Multi Pro 1200 - Traction Speed Sensor

Multi Pro 1200/1250
Page 5 -- 13
Electrical System
Traction Speed Sensor
The traction s peed sensor is attached to the upper
transaxle cover (Fig. 18). It uses a magnetically based,
Hall Effect integrated circuit. As the differential in the
transaxleturns,thesensoraccuratelysensesthemove-
ment of the differential ring gear teeth passing by the
sensor. The red striped connector wire is the positive
lead, the black wire is the ground lead and the gray
striped wire is the signal output.
Testing
1. Park machine on a level surface, stop engine, en-
gage parking brake and remove key from ignition
switch.
2. Locate traction speed sensor on the transaxle as-
sembly.D isconnectthewireharnessconnectorfromthe
traction speed sensor.
3. Remove cap screw and lock washer that secure
speed sensor to transaxle. Remove speed sensor from
transaxle.
4. Connect positive multimeter test lead to the sensor
connector gray striped wire terminal and the negative
multimeter lead to the connector black wire terminal
(Fig. 19). Set multimeter to ohms setting.
IMPORTANT: Incorrect jumper wire connections
during testing can damage the sensor.
5. Usinga+12VDCbattery,a multimeter,a1Kohmre-
sistorandappropriatejumperwires,connectthebattery
and multimeter to the speed sensor using Figure 19 as
a guide.
6. Set multimeter to DC volts setting.
7. Themultimetershoulddisplayverylowvoltagewhen
ametalobjectisheldnearthesensortip.Themultimeter
should display battery voltage when the metal object is
moved away from the sensor tip.
8. After testing is complete, r emove jumper wires, re-
sistor and multimeter leads from sensor connector.
9. Replace speed sensor if necessary.
10.After testing is complete, remove jumper wires and
multimeter leads from sensor connector. Install speed
sensor into transaxle and secure with cap screw and
lock washer. Connect speed sensor to wire harness.
1. Transaxle
2. Traction speed sensor
3. Sensor connector
Figure 18
2
3
1
1. Speed sensor
2. Sensor tip
3. Sensor connector
4. Red striped wire
5. Gray striped wire
6. Black wire
Figure 19
BAC
--
+
12 VDC
6
4
2
3
1
5
1K ohm
resistor
Electrical
System