Toro 07390 Workman HDX-Auto, Service Manual, Page: 166 / 280

Workman HDX Auto Page 6 − 18 Electrical System
Front Differential Interrupter Switch (Vehicles with 4WD)
The front differential interrupter switch is a normally
closed switch that opens when the accelerator pedal is
not depressed. When the accelerator pedal is de-
pressed for vehicle acceleration, the flange on the accel-
erator pedal moves away from the switch plunger to
allow the switch to be in its normally closed state. The dif-
ferential interrupter switch is attached to the pedal sup-
port frame under the dash panel (Fig. 22).
Testing
1. Park machine on a level surface, stop engine, apply
parking brake and remove key from ignition switch.
2. To ease access to interrupter switch, remove hood of
vehicle (see Hood in the Service and Repairs section of
Chapter 5 − Chassis).
3. Locate front differential interrupter switch for testing.
Disconnect vehicle wire harness electrical connector
from the interrupter switch.
4. Check the continuity of the switch by connecting a
multimeter (ohms setting) across the connector termi-
nals.
5. When the switch plunger is extended (accelerator
pedal is depressed), there should be continuity (closed)
between the switch terminals.
6. When the switch plunger is depressed (accelerator
pedal is not depressed), there should not be continuity
(open) between the switch terminals.
7. Replace interrupter switch if testing determines that
it is faulty. When installing switch, make sure that the
brake pedal does not bottom switch when the pedal is re-
leased.
8. If the interrupter switch tests correctly and a circuit
problem still exists, check wire harness (see Electrical
Schematic and Circuit Drawings in Chapter 7 − Electrical
Drawings).
9. When interrupter switch testing is completed, con-
nect switch connector to vehicle wire harness.
10.Install hood of vehicle if it was removed (see Hood in
the Service and Repairs section of Chapter 5 − Chassis).
Adjustment
Make sure that the flange of the accelerator pedal is
against the stop. The plunger of the switch should be
bottomed out in the switch. If necessary, loosen switch
fasteners and reposition switch. Tighten fasteners after
adjustment.
1. Accelerator pedal flange
2. Interrupter switch
3. Accelerator pedal stop
Figure 22
1
2
3
FRONT