Toro Groundmaster 31900, Service Manual

Page: 195 / 355

TDM Display/Controller
g305621
Figure 74
1. TDM display/controller
3. Display screen select button
2. Bi-color LED indicator
The TDM display/controller is an LCD device located on the operator’s console
that presents operating hours and engine coolant temperature for all models,
and electrical system voltage, engine RPM for models 31902 and 31903. The
display will also present active machine and engine faults.
The display screen select button located next to the TDM is used to select the
various display screens. Press the screen select button once, press and hold the
button, or press the button twice quickly to navigate around the display screens.
A bi-color LED is incorporated into the TDM display/controller panel. The LED
is green during normal operation and flashes red when an active machine or
engine fault is present. Power for the TDM is available when the main power
relay is energized (key switch is in the ON or START position). A 15 Amp fuse
(FB1–F4) protects the TDM power circuit.
The TDM display/controller is also a 2001 series microcontroller that monitors
the condition of various machine switches and sensors (inputs) and directs
electrical power to control appropriate machine functions (outputs) based on the
state of the inputs. The status of inputs to the controller can be monitored with
the TDM display/controller screens; refer to
Using the TDM Display/Controller
Screens for Troubleshooting (page 3–12) .
The TDM display/controller, the Yanmar Engine Control Unit (ECU)(models
31902 and 31903), and the optional controllers (future attachments) used on the
Groundsmaster 3200/3300/3310 machines communicate with each other on a
Controller Area Network (CAN) bus system.
Note: If the TDM display/controller is replaced for any reason, system software
needs to be reloaded (contact an Authorized Toro Distributor for assistance).
Groundsmaster ® 3200, 3300 and 3310 Page 6–3 Electrical System: General Information
19240SL Rev A