Can Bus Terminator Resistors - Toro Pro Force 44552TE Service Manual

CAN bus Terminator Resistors

Testing the CAN bus Terminator Resistor
Pro Force® Debris Blower
18237SL Rev A
g223018
1. CAN-bus terminator resistor
The system communication between the electrical components on the Pro Force
Debris Blower is accomplished on a CAN bus communication system. The 2
specially designed, twisted cables form the bus for the network are used on
the machine. These wires provide the data pathways between the machine
components. 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). A 120 ohm termination resistor is located at
each end of the CAN–bus.
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.
One of the resistors is secured to the machine wire harness near the started
motor, and one of the resistors is secured to the machine wire harness near the
key switch in the control tower (battery removal may be necessary to access
the resister).
Refer to the Electrical Schematics and Wire Harness Drawings/Diagrams in
Appendix A (page A–1)
resistor and wire connections.
The insulator wedge in the terminator resistor is blue for identification purposes.
There is also a center keyway to prevent the terminator resistor from being
plugged into the wrong wire harness connector.
Both terminator resistors are required for proper electrical system
operation.
1. Make sure that key switch is O
2. Unplug the resistor from the wire harness.
3. Use a digital multimeter (ohms setting) to measure the resistance value for
the CAN bus terminator resistor. There should be 120 ohms resistance
between the terminals A and B. The terminal C is not used.
4. Replace the resistor if necessary.
Figure 31
2. Keyway
for additional information on the location of the terminator
IMPORTANT
and key is removed from the switch.
FF
Page 5–27 Electrical System: Testing the Electrical Components