Toro Groundmaster 31900, Service Manual, Page: 197 / 355

CAN bus Communications
The machine controllers communicate with each other on a Controller Area
Network (CAN) bus system. Using this network allows full integration of all the
different electrical components of the machine, allowing them to operate together
as one. The CAN bus system reduces the number of electrical components and
connections used on the machine and allows the number of wires in the wire
harness to be significantly reduced.
For model 31900, 31901, 31907 and 31909 machines, the TDM controller is the
only controller on the CAN bus presently. For model 31902 and 31903 machines,
the TDM controller and the Yanmar engine ECU are the only controllers on the
CAN bus presently. Additional controllers (for attachments) may be added
to the CAN bus in the future through the expansion port connector and/or the
telematics connector.
Each of the components that is controlled by the CAN bus link only needs four
(4) wires to operate and communicate to the system: CAN High, CAN Low,
power and ground. The key switch needs to be in the RUN or START position
for the components on the network to be activated.
Two specially designed, twisted wires form the CAN bus. These wires provide the
data pathways between the components on the network. The engineering term
for these cables are CAN High and CAN Low. The CAN bus wires are red/white
(CAN-High) and black/white (CAN Low). At each end of the CAN bus is a 120
ohm termination resistor; refer to
CAN bus Terminator Resistors (page 6–56) .
g305596
Figure 76
1. Operator’s console 3. Cover
2. DIAG connector
The Toro DIAG electronic control diagnostics service system is available to
Authorized Toro Distributors to support machine fault diagnosis and maintenance
services of the machine electrical control devices. The Toro DIAG connector is
located at the rear of the operator’s console.
Groundsmaster ® 3200, 3300 and 3310 Page 6–5 Electrical System: General Information
19240SL Rev A