Toro 41188, Service Manual

Page: 138 / 353

Multi Pro 1750
Page 5 − 36
Electrical System
Parking Brake Switch
The parking brake switch is a normally open proximity
switch attached to the parking brake bracket (Fig. 36).
The switch is in its normal open position as long as the
parking brake lever is released (disengaged). When the
parking brake lever is raised (parking brake engaged),
the lever is positioned close to the proximity switch caus-
ing the switch to close.
The Toro Electronic Controller (TEC) monitors the op-
eration of the parking brake switch (input). The parking
brake switch is used in the engine start and engine run
interlock system to make sure that either the parking
brake is engaged or the operator is in the seat while the
engine is being started or running. The parking brake
switch is also involved in the throttle lock feature.
Testing
The parking brake switch and its circuit wiring can be
tested as a TEC qualifier using the InfoCenter Display
(see InfoCenter Display − Diagnostics Screen in this
chapter). If testing determines that the switch and circuit
wiring are not functioning correctly, proceed with the fol-
lowing test procedure:
1. Park machine on a level surface, stop spray pump,
stop engine and engage parking brake. Remove key
from ignition switch.
2.Raise and support operator seat to access parking
brake switch connector.
3. Disconnect the wire harness from the parking brake
switch connector. Use a multimeter (ohms setting) to
test continuity across the switch terminals. There should
be continuity (zero ohms) when the parking brake lever
is raised (brake engaged) and there should not be conti-
nuity (infinite ohms) when the parking brake lever is re-
leased (brake disengaged).
1. Parking brake lever 2. Parking brake switch
Figure 36
1
2
4. Replace the parking brake switch if switch proves
faulty. To replace the parking brake switch:
A. Remove the three (3) hex head screws and flat
washers and two (2) panel fasteners securing the left
seat base and fender assemble to the machine.
B. Lift the left seat base and fender assembly from
the machine.
C. Remove the two (2) switch mounting screws and
replace the switch.
D. Reinstall the left seat base and fender assembly.
5. If the parking brake switch tests correctly and a cir-
cuit problem still exists, check wire harness (see Electri-
cal Schematic and Wire Harness Drawings in Chapter
10 − Electrical Drawings in this manual).
6. After switch testing is completed, connect the wire
harness to the switch connector. Lower and secure seat.