Toro Pro Force 44552, Service Manual

Page: 65 / 134

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. 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 either red/white or yellow (CAN-High) and either black/white or green
(CAN Low). At each end of the CAN bus is a 120 ohm termination resistor; refer
to
CAN bus Terminator Resistors (page 5–27) .
The can bus is incorporated into the machine wire harness of all model 44552,
44552TE, 44553, and 44554 machines. Only machines with wireless remote
control (model 44552. 44552TE, and 44553) have components that use the
CAN bus for communication.
Testing the CAN bus
g278232
Figure 17
1. Machine control tower 3. Toro DIAG connector
2. Connector cover
1. Make sure that key switch is OFF and key is removed from switch.
2. The Toro DIAG connector is part of the CAN bus and is located on the left
side of the machine control tower.
3. Locate the Toro DIAG connector and remove it from the connector cover.
4. Use a multimeter (ohms setting) to measure the resistance across terminals
A and B.
• A reading of 54 to 66 ohms indicates the CAN bus is intact.
• A reading of 120 ohms indicates one of the CAN bus terminator resistors
is not connected, damaged, or the CAN bus wiring is damaged; refer to
CAN bus Terminator Resistors (page 5–27) and/or Appendix A (page A–1) .
5. Install the Toro DIAG connector after testing.
Pro Force® Debris Blower Page 5–11 Electrical System: Testing the Electrical Components
18237SL Rev A