Can Bus Terminator Resistors - Toro Groundmaster Series Service Manual

CAN bus Terminator Resistors

Testing the CAN bus Terminator Resistors
Electrical System: Testing the Electrical Components
System communication between various electrical components on the
Groundsmaster 3200/3300/3310 machines is accomplished on a CAN bus
communications network. 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). A 120
ohm termination resistor is located at each end of the CAN–bus.
For model 31900, 31901, 31907 and 31909 machines, one of the CAN bus
terminator resistors is located at the rear of the operator's console and one of
the CAN bus terminator resistors is located at the front of the operator's console
under the console cover. Both of the CAN bus terminator resistors are (external)
and are replaceable separately.
For model 31902 and 31903 machines, one of the CAN bus terminator resistors
is located at the front of the operator's console under the console cover (external)
and is replaceable separately. The second CAN bus termination resistor is part
of the Yanmar engine ECU (integrated) and can be tested as part of the CAN
bus wiring. The integrated termination resistor is not replaceable separately.
Note: Refer to Appendix A (page A–1)
bus wiring.
External Resistors
g305816
1. CAN bus terminator resistor at connector
P35
1. Park the machine on a level surface, lower the cutting unit (or attachment),
engage the parking brake, set the key switch to the O
the key from the key switch.
2. Remove the operator's console covers if necessary; refer to
Installing the Operator's Console Covers (page
3. Disconnect the CAN bus terminator resistor from the machine wire harness
and use a multimeter (ohms setting) to check the resistor. Check the
for additional information on the CAN
Figure 104
2. CAN bus terminator resistor at connector
P111 (models 31900, 31901, 31907 and
31909)
Page 6–56
position and remove
FF
Removing and
7–23).
Groundsmaster ® 3200, 3300 and 3310
19240SL Rev A