Toro Electronic Controller (Tec) - Toro Reelmaster 3550-D Preliminary Service Manual

Toro Electronic Controller (TEC)

The Reelmaster 3550--D uses a Toro Electronic Control-
ler (TEC) to monitor the condition of various switches
(inputs) and then directs power output to allow certain
machine functions. The controller is located under the
control panel (Fig. 31). The handheld Diagnostic Dis-
play (see Special Tools in this chapter) with the correct
overlay should be used when checking inputs and out-
puts of the controller used on your Reelmaster (see
Troubleshooting in this chapter).
Inputs from the ignition, traction neutral, parking brake,
PTO, seat, joystick, mow/transport, backlap, engine oil
pressure and engine coolant switches are all monitored
by the controller.
Current output to the indicator lights, mow circuit hy-
draulic valve solenoid coil, lift circuit hydraulic valve so-
lenoid coils and engine components (glow plug relay,
start relay, fuel pump and engine run solenoid) are con-
trolled based on the inputs received by the controller.
Because of the solid state circuitry built into the control-
ler, there is no method to test the controller directly. The
controller may be damaged if an attempt is made to test
it with an electrical test device, such as a digital multime-
ter.
IMPORTANT: Before performing any welding on the
machine, disconnect both positive and negative
battery cables from the battery, disconnect the wire
harness connector from the TEC controller and dis-
connect the terminal connector from the alternator.
This will prevent damage to the electrical system of
your Reelmaster.
Reelmaster 3550--D
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2
1. Control panel
2. TEC controller
Page 5 - - 25
1
Figure 31
3. Cap screw (4 used)
4. Flange nut (4 used)
Electrical System
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