Relays With Four (4) Terminals - Toro Groundsmaster 4000-D Service Manual

Relays with Four (4) Terminals

Your Groundsmaster uses a number of electrical relays
that have four (4) terminals. A tag near the wire harness
relay connector can be used to identify each relay.
The main power relay is used to provide current to most
of the fuse protected circuits (operator seat, InfoCenter
display, power point and optional electric equipment).
The main power relay is energized when the ignition
switch is in the RUN or START position.
The TEC power relay is used to provide current to the
fuse protected circuits for the TEC controller. The TEC
power relay is energized when the ignition switch is in
the RUN or START position.
The cab power relay is used on Groundsmaster 4010--D
machines to provide current to the operator cab electri-
cal components. The cab power relay is energized when
the ignition switch is in the RUN or START position.
The start relay is used to provide current to the engine
starter motor solenoid. The start relay is energized by
the engine ECU.
The air heater relay is used on models 30603 and 30605
to provide current for the engine air heater used for start-
ing a cold engine. When necessary, the air heater relay
is energized by the engine ECU.
The glow relay is used on models 30607 and 30609 to
provide current to the engine glow plugs when ener-
gized by the engine ECU.
The main power, TEC power and cab power relays are
located under the controller cover next to the operator
seat (Fig. 55). The start, air heater and glow relays are
attached to the controller mount on the right side of the
engine (Fig. 56 or 57).
Testing
1. Park machine on a level surface, lower cutting
decks, stop engine, engage parking brake and remove
key from the ignition switch.
2. To make sure that machine operation does not occur
unexpectedly, disconnect negative (--) cable from bat-
tery and then disconnect positive (+) cable from battery
(see Battery Service in the Service and Repairs section
of this chapter).
3. Locate relay that is to be tested.
4. Disconnect wire harness connector from relay. Re-
move relay from mounting bracket for testing.
Electrical System
3
2
1. Main power relay
2. TEC power relay
2
3
1. Controller mount
2. Engine ECU
2
3
1. Controller mount
2. Engine ECU
Page 5 - - 46
1
Figure 55
3. Cab power relay
4. Operator seat
MODELS 30603 AND 30605
4
1
Figure 56
3. Start relay
4. Air heater relay
MODELS 30607 AND 30609
4
1
Figure 57
3. Start relay
4. Glow relay
Groundsmaster 4000--D/4010--D
4