Traction Speed Sensor - Toro Multi Pro 1200 Service Manual

Traction Speed Sensor

The traction speed sensor is attached to the upper
transaxle cover (Fig. 18). It uses a magnetically based,
Hall Effect integrated circuit. As the differential in the
transaxle turns, the sensor accurately senses the move-
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. Disconnect the wire harness connector from the
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. Using a +12 VDC battery, a multimeter, a 1K ohm re-
sistor and appropriate jumper wires, connect the battery
and multimeter to the speed sensor using Figure 19 as
a guide.
6. Set multimeter to DC volts setting.
7. The multimeter should display very low voltage when
a metal object is held near the sensor tip. The multimeter
should display battery voltage when the metal object is
moved away from the sensor tip.
8. After testing is complete, remove 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.
Multi Pro 1200/1250
2
1. Transaxle
2. Traction speed sensor
1. Speed sensor
2. Sensor tip
3. Sensor connector
Page 5 - - 13
3
Figure 18
3. Sensor connector
1K ohm
resistor
+
12 VDC
6
4
C B A
3
5
1
2
Figure 19
4. Red striped wire
5. Gray striped wire
6. Black wire
Electrical System
1
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