Toro Groundsmaster 4300-D Service Manual page 274

Toro Electronic Controller (TEC) (continued)
Electrical System: Testing the Electrical Components
arm access cover next to the fuse block
when checking the inputs and outputs of the TEC used on your machine.
The logic power is provided to the controller as long as the battery cables are
connected to the battery. Circuit protection for this logic power to the controller is
provided by 2 A fuse.
The inputs from the key, neutral, parking brake, PTO, seat, mow/transport,
joystick lower/raise, engine speed switches, and pressure transducer are all
monitored by the controller.
The current output to the following components are controlled based on the
inputs received by the controller.
•
Mow circuit hydraulic valve solenoid coils
•
Lift circuit hydraulic valve solenoid coils
•
Fuel pump and engine ECU
The InfoCenter displays a machine fault code and description when an issue
is detected.
The connection terminal functions for the TEC are shown in
that electrical power for the controller outputs is provided through 3 connectors
(PWR 2, PWR 3, and PWR 4) each protected with a 7.5 A fuse. A 50 pin wire
harness connector attaches to the controller. The connector pins are identified
in Figure 160.
When testing for wire harness continuity at the connector for the
TEC, ensure that you do not damage the connector pins with the
multimeter test leads. If the connector pins are enlarged or damaged
during testing, connector repair will be necessary for proper
machine operation.
The machine Electrical Schematic and Wire Harness Drawings/Diagrams in
Appendix A (page A–1)
the controller and the input/output devices (e.g., switches and solenoid coils).
Because of the solid state circuitry built into the controller, 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 (e.g., digital multimeter).
Before performing any welding on the machine, disconnect both
negative and positive battery cables from the battery, disconnect
the wire harness connector from the TEC and engine ECU, and
disconnect the terminal connector from the alternator. This will
prevent damage to the electrical system of your Groundsmaster.
(Figure
IMPORTANT
can be used to identify possible circuit problems between
IMPORTANT
Page 5–50
159). Use the InfoCenter display
Figure 160. Note
Groundsmaster
16226SL Rev C
® 4300-D