Groundsmaster 4300--DPage 5 -- 34Electrical System
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-
hindthe controlarmaccess covernextto thefuseblock
(Fig.38).ThehandheldDiagnosticDisplay(seeSpecial
Tools in this chapter) with the correct overlay should be
usedwhencheckinginputsandoutputsofthecontroller
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
andengine hightemperature shutdownswitchesare all
monitored by the controller.
Currentoutputto thecuttingdeckcircuithydraulic valve
solenoid coils, lift circuit hydraulic valve solenoid coils,
diagnostic light and engine components (glow plug
relay,startrelay,fuelpumpandenginerunsolenoid)are
controlled based on the inputs received by the control-
ler.
If the controller detects a malfunction in any of the con-
trolledcircuits,thediagnosticlightcanbeusedtoidenti-
fy the fault (seeDiagnostic Light in the Troubleshooting
section of this chapter).
Because ofthe solid state circuitry builtinto 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 onthe
machine, disconnect both positive and negative
battery cables from the battery,disconnect the wire
harnessconnector from theTEC controller anddis-
connect the terminal connector from the alternator.
This will prevent damage to the electrical system of
your Groundsmaster.
1. TEC controller 2. Fuse block
Figure 38
1
2
To Next Page
Loading...
Need help?
General
