Toro Electronic Controller (Tec) - Toro Greensmaster TriFlex 3300 Service Manual

Toro Electronic Controller (TEC)

Greensmaster TriFlex machines use a Toro Electronic
Controller (TEC) to monitor the condition of various
switches (inputs) and then direct electrical power output
to allow certain machine functions. The controller is at-
tached to the frame under the right side cover next to op-
erator seat (Fig. 56).
Inputs from the ignition, neutral, parking brake, seat,
joystick, mow, backlap and engine oil pressure are all
monitored by the TEC controller. TEC inputs on Green-
smaster 3300 machines also include the leak detector
sensor. TEC inputs on Greensmaster 3400 machines
also include the alternator, engine temperature sender
and hydraulic temperature sender.
On all TriFlex Greensmaster machines, TEC controller
current output to the mow circuit hydraulic valve sole-
noid coil (PRV), lift circuit hydraulic valve solenoid coils
(S1, S2, S3 and S4) and console diagnostic light are
controlled based on the inputs received by the control-
ler. TEC outputs on Greensmaster 3300 machines also
include the start solenoid, fuel solenoid, charge circuit
relay, kill relay and Turf Defender
cator light and alarm. TEC outputs on Greensmaster
3400 machines also include the start relay, glow relay,
fuel pump, engine run solenoid (hold coil), fan relay, con-
sole indicator lights.
The diagram in Figure 57 depicts the connection termi-
nal functions of the TEC controller. A fifty (50) pin wire
harness connector attaches to the controller. The con-
nector pins are listed in the diagram. Note that electrical
power for controller outputs is provided through three (3)
connectors each protected with a 7.5 amp fuse.
The handheld Diagnostic Display (see Special Tools in
this chapter) with the correct Display overlay should be
used when checking inputs and outputs of the controller
used on your Greensmaster (see Diagnostic Display in
the Troubleshooting section of this chapter). If the con-
troller detects a malfunction in any of the controlled cir-
cuits, the diagnostic light can be used to identify 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 Greensmaster.
Electrical System
TM
Leak Detector indi-
Page 6 - - 44
2
Figure 56
1. TEC controller
12V POWER
(7.5A FUSES)
12V LOGIC
POWER
(2 AMP FUSE)
IGNITION
SWITCH
INPUTS
DIGITAL
INPUTS
(OPEN/
CLOSED)
ANALOG
INPUTS
(VARIABLE)
Figure 57
1
2. Loopback connector
OUTPUTS
(PWR2)
OUTPUTS
(PWR3)
OUTPUTS
(PWR4)
DIAGNOSTIC
DISPLAY
CAN BUS
GROUND
Greensmaster 3300/3400