Toro Electronic Controller (Tec) (4Wd Machines) - Toro Groundsmaster 360 Service Manual

Toro Electronic Controller (TEC) (4WD Machines)

Groundsmaster 360 machines with 4WD use a Toro
Electronic Controller (TEC) to monitor the condition of
various switches (inputs) and then direct electrical pow-
1
er output to allow certain machine functions. The con-
troller is attached to the frame under the operator seat
(Fig. 54). 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). 2
NOTE: Optional kits for the Groundsmaster 360 are
available that require the use of an additional TEC con-
troller. Even though the additional controller appears
identical to the standard controller, they are different in
terms of the connectors and internal hardware. The two
controllers cannot be interchanged.
Figure 54
Inputs from the ignition, neutral, parking brake, PTO,
1. TEC controller location 2. Loopback connector
seat, deck lift, steering selector, steering home, engine
temperature, engine oil pressure and engine high tem-
perature shutdown switches are all monitored by the
controller.
Current output to the PTO circuit hydraulic valve sole-
noid coil, lift circuit hydraulic valve solenoid coils, 4
wheel steering hydraulic valve solenoid coil, 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 controller.
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 Page 5 - - 42 Groundsmaster 360