Engine Cooling Fan Switch - Toro Groundsmaster 4700-D Service Manual

Engine Cooling Fan Switch

The engine cooling fan switch is located on the outside
of the console arm (Fig. 25). This two position rocker
switch allows the engine cooling fan to run in the normal,
automatic mode or in the manual reverse (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 input with the Diagnostic Display (see
Diagnostic Display in the Troubleshooting section of this
chapter). If the Diagnostic Display verifies that cooling
fan switch and circuit wiring are functioning correctly, no
further switch testing is necessary. If, however, the Dis-
play determines that cooling fan 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 en-
gine cooling fan switch (see Console Arm Disassembly
in the Service and Repairs section of Chapter 7 -- Chas-
sis).
4. Disconnect harness electrical connector from the
cooling fan 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
position. The switch terminals are marked as shown in
Figure 26. The circuitry of the cooling fan switch is
shown in the chart below. Verify continuity between
switch terminals.
SWITCH NORMAL
POSITION CIRCUITS
AUTO
MANUAL RE-
VERSE
6. If switch tests correctly and circuit problem still ex-
ists, check wire harness (see Electrical Schematics and
Wire Harness Drawings in Chapter 9 -- Foldout Draw-
ings).
7. After testing is completed, connect wire harness
connector to the cooling fan switch.
8. Assemble console arm (see Console Arm Assembly
in the Service and Repairs section of Chapter 7 -- Chas-
sis).
Groundsmaster 4500--D/4700--D
OTHER
CIRCUITS
2 + 3 5 + 6
2 + 1 5 + 4
Page 5 - - 21
2
Figure 25
1. Console arm
BACK OF SWITCH
Figure 26
NOTE: Fan switch terminals 3, 4, 5 and 6 are not used
on Groundsmaster 4500--D and 4700--D machines.
1
2. Cooling fan switch
Electrical System