Engine Cooling Fan Switch - Toro Groundsmaster 4100-D Service Manual

Engine Cooling Fan Switch

The engine cooling fan switch is a two (2) position rocker
switch that is located on the outside of the control con-
sole (Fig. 30). The switch has a normal and a momen-
tary position.
The engine cooling fan switch is used as an input for the
TEC--5002 controller to allow the engine cooling fan to
run in the normal, automatic mode or in the manual re-
verse (momentary) direction.
Testing
1. Before disconnecting the engine cooling fan switch
for testing, the switch and its circuit wiring should be
tested as a TEC--5002 input with the Diagnostic Display
(see Diagnostic Display in the Troubleshooting section
of this chapter). If the Diagnostic Display verifies that
switch and circuit wiring are functioning correctly, no fur-
ther switch testing is necessary. If, however, the Display
determines that the switch and circuit wiring are not
functioning correctly, proceed with test.
2. Make sure ignition switch is OFF. Remove key from
ignition switch.
3. Disassemble console arm to gain access to the cool-
ing fan switch (see Console Arm Disassembly in the
Service and Repairs section of Chapter 7 -- Chassis).
4. Disconnect wire harness electrical connector from
the switch.
5. With the use of a multimeter (ohms setting), the
switch functions may be tested to determine whether
continuity exists between the various terminals for each
switch position. The switch terminals are marked as
shown in Figure 31. The circuitry of the cooling fan
switch is shown in the chart below. Verify continuity be-
tween switch terminals.
SWITCH NORMAL
POSITION CIRCUITS
NORMAL
MOMENTARY
Groundsmaster 4100--D/4110--D
OTHER
CIRCUITS
2 + 3 5 + 6
2 + 1 5 + 4
Page 5 - - 27
6. If switch tests correctly and circuit problem still ex-
ists, check wire harness (see Electrical Schematics and
Wire Harness Drawings in Chapter 10 -- Foldout Draw-
ings).
7. After testing is completed, connect wire harness
connector to the switch.
8. Assemble console arm (see Console Arm Assembly
in the Service and Repairs section of Chapter 7 -- Chas-
sis).
2
Figure 30
1. Console arm
BACK OF SWITCH
Figure 31
NOTE: Only cooling fan switch terminals 1 and 2 are
used on Groundsmaster 4100--D and 4110--D ma-
chines.
1
2. Cooling fan switch
Electrical System