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Electronic Control Unit (ECU)
The Toro electronic control unit (ECU) senses the con
dition of various switches, such as the seat switch,
cutting unit down switches, traction neutral switch, etc.,
and directs power output to allow certain machine func
tions, such as engine run, cutting units engage, etc.
Because of the solid state circuitry built into the control
ler, there is no method to test it directly. The controller
may be damaged if an attempt is made to test it with an
electrical test device, such as a volt-ohm meter.
IMPORTANT: Before welding on the machine, dis
connect both battery cables from the battery, dis
connect both wire harness connectors from the
electronic control unit and disconnect the terminal
connector from the alternator to prevent damage to
the electrical system.
Seat Switch
The seat switch is a proximity type, normally open (NO)
reed switch that closes when the operator is on the seat.
With the operator on the seat, the magnet on the bottom
of the seat activates the reed switch causing it to close
and complete the circuit.
1. Raise the seat to get access to the seat switch wiring
connector.
2. Disconnect the seat switch wiring connector and
install a continuity tester or ohm meter between the two
leads of the seat switch.
3. Lower the seat. The continuity tester should show no
continuity.
NOTE: Make sure the compression spring holds the
seat up off the seat switch when there is no operator on
the seat.
4. Have the operator sit on the seat, slowly depressing
the seat switch magnet. The continuity tester should
show continuity as the seat approaches the bottom of
its travel.
®
Reelmaster
5100-D
1. Electronic control unit (ECU)
1
Page 5 - 19
1
Figure 11
Figure 12
1. Seat switch
Testing
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