Can Bus - Toro Workman GTX Electric & Lithium Service Manual

CAN bus

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.
The display (T), lithium--ion battery controller (BMS --
Battery Management System) (SC1) and traction con-
troller (SC2) are on the CAN bus. Additional controllers
may be added to the CAN bus in the future through the
expansion port connector and/or the telematics con-
nector.
Each of the components that is controlled by the CAN
bus link only needs four (4) wires to operate and commu-
nicate 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 Res-
istors.
Testing the CAN bus
1. Park the machine on a level surface, engage the
parking brake, set the key switch to the OFF position
and remove the key from the key switch.
2. The Toro DIAG connector is part of the CAN bus
and is located inside the dash. Raise the hood and
get access to the DIAG connector. Remove the con-
nector cover from the machine wire harness and use
a multimeter (ohms setting) to check the Toro DIAG
connector.
Location Harness
1 Main
2 Main
Electrical System
1. DIAG connector
2. Cover
Note:
terminator resistor is not connected or damaged.
Refer to CAN bus Terminator Resistor and/or see elec-
trical schematic and wire harness drawing in Chapter 6
-- Electrical Drawings. If necessary, contact an Author-
ized Toro Distributor for assistance.
3. Install the connector cover and hood after testing.
Connector Pin
P44 A
P44 B
Page 3B - - 26
1 2
3
Figure 22
3. Display
A reading of 120 ohms indicates the CAN bus
C
B
Figure 23
Wire Color
Yellow
Green
Workman GTX Electric Lithium
A
Expected
Reading
54 to 66 ohms