Speed Sensor - Toro Workman HDX Auto Service Manual

Speed Sensor

The speed sensor is attached to the upper transaxle
cover (Fig. 37). It uses a magnetically based, Hall Effect
integrated circuit. As the differential in the transaxle
turns, the sensor accurately senses the movement of
the differential ring gear teeth passing by the sensor. The
red striped connector wire is the sensor 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, raise bed, stop en-
gine, apply parking brake and remove key from ignition
switch.
2. Install bed support on bed lift cylinder to prevent bed
from lowering.
3. Locate traction speed sensor on the transaxle as-
sembly. Disconnect the wire harness connector from the
traction speed sensor.
4. Remove flange head screw that secures speed sen-
sor to transaxle. Remove speed sensor from transaxle.
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 38 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, resis-
tor and multimeter leads from sensor connector.
9. Replace speed sensor if necessary.
10.Install speed sensor into transaxle and secure with
flange head screw. Reconnect speed sensor to wire har-
ness.
11. Remove bed support from cargo bed lift cylinder and
lower bed.
Workman HDX Auto
1. Speed sensor
6
1. Speed sensor
2. Sensor tip
3. Sensor connector
Page 6 − 27
1
Figure 37
2. Flange head screw
1K ohm
resistor
+
12 VDC
4
C B A
3
5
1
2
Figure 38
4. Red striped wire
5. Gray striped wire
6. Black wire
Electrical System
2
−