Steering Home Sensor (4Wd Machines) - Toro Groundsmaster 360 Service Manual

Steering Home Sensor (4WD Machines)

The steering home sensor is used on Groundsmaster
360 machines with 4WD to determine when the wheels
are directed straight ahead. The sensor acts as an input
for the Toro Electronic Controller (TEC) to determine
when steering can be changed from 4 wheel steering to
2 wheel steering.
The steering home sensor is a normally open proximity
sensor. The sensor mounts to a bracket that is secured
to the bottom of the front axle near the left side front
steering fork (Fig. 51). The sensing plate for the steering
home sensor is a target bracket attached to the left side
front steering fork.
When the left side front steering fork is in the straight
ahead position, a hole in the target bracket is positioned
directly below the steering home sensor allowing the
sensor to be in its normally open state. The sensor
closes when the left side front steering fork is not in the
straight ahead position.
Testing
1. Park machine on a level surface, lower cutting deck
and stop engine.
2. Before disconnecting the steering home sensor for
testing, the sensor and its circuit wiring should be tested
as an electrical input using the Diagnostic Display (see
Diagnostic Display in the Troubleshooting section of this
chapter). If input testing verifies that the steering home
sensor and circuit wiring are functioning correctly, no
further sensor testing is necessary. If, however, input
testing determines that the steering home sensor and
circuit wiring are not functioning correctly, proceed with
the following steering home sensor testing procedure.
3. Locate steering home sensor and target bracket on
LH front steering fork (Fig. 51).
4. Turn steering wheel so that front wheels are turned
and check that hole in target bracket on LH steering fork
is not directly below the steering home sensor. Turn igni-
tion switch to the RUN position (do not start engine) and
check LED on cable end of steering home sensor. LED
should be illuminated when the front wheel is turned
(is not aimed straight ahead).
5. Turn steering wheel so front wheels are straight
ahead and check that hole in target bracket on LH steer-
ing fork is directly below the steering home sensor. With
the ignition switch still in the RUN position (do not start
engine), check LED on cable end of steering home sen-
sor. LED should not be illuminated when the front
wheel is not turned (is aimed straight ahead).
Groundsmaster 360
6. If the steering sensor LED did not function correctly:
A. Make sure that parking brake sensor is properly
adjusted (see Parking Brake Sensor in the Adjust-
ments section of this chapter). If necessary, adjust
sensor and return to step 4 above.
B. Make sure ignition switch is OFF and disconnect
the steering home sensor connector from the ma-
chine wire harness.
C. Using a multimeter, verify that the machine wire
harness connector terminal for black wire is closed
(continuity) to ground.
D. Turn ignition switch to the RUN position (do not
start engine) and verify with a multimeter that ma-
chine wire harness connector terminal for pink wire
has system voltage (12 VDC) present.
E. If black wire is closed to ground, pink wire has
system voltage present and sensor LED did not func-
tion, replace steering home sensor. Adjust sensor af-
ter installation (see Steering Home Sensor in the
Adjustments section of this chapter).
7. After steering home sensor testing is complete,
make sure that sensor connector is plugged into ma-
chine wire harness.
5
3
FRONT
1. Front axle
2. LH front steering fork
3. Steering home sensor
4. Target bracket
Page 5 - - 39
1
7
6
4
2
Figure 51
5. Sensor bracket
6. Jam nut (2 used)
7. Lock washer (2 used)
Electrical System