Toro Electronic Controller (Tec) - Toro GroundsmasterR 4300-D Service Manual

Toro Electronic Controller (TEC)

The Groundsmaster 4300--D uses a Toro Electronic
Controller (TEC) to monitor the condition of various
switches (inputs) and then direct power output to allow
certain machine functions. The controller is located be-
hind the control arm access cover next to the fuse block
(Fig. 38). The handheld Diagnostic Display (see Special
Tools in this chapter) with the correct overlay should be
used when checking inputs and outputs of the controller
used on your Groundsmaster (see Troubleshooting in
this chapter).
Inputs from the ignition, neutral, parking brake, PTO,
seat, mow/transport, joystick lower/raise, temperature
gauge output, hydraulic pressure, engine oil pressure
and engine high temperature shutdown switches are all
monitored by the controller.
Current output to the cutting deck circuit hydraulic valve
solenoid coils, lift circuit hydraulic valve solenoid coils,
diagnostic light and engine components (glow plug
relay, start relay, fuel pump and engine run solenoid) are
controlled based on the inputs received by the control-
ler.
If the controller detects a malfunction in any of the con-
trolled circuits, the diagnostic light can be used to identi-
fy the fault (see Diagnostic Light in the Troubleshooting
section of this chapter).
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 digital multimeter.
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 Groundsmaster.
Electrical System
1. TEC controller
Page 5 - - 34
1
Figure 38
2. Fuse block
Groundsmaster 4300--D
2