Yanmar Engine Electrical Components; Can−Bus Communications; Electrical Drawings - Toro Groundsmaster 4500-D Series Service Manual

Yanmar Engine Electrical Components

CAN−bus Communications

Electrical Drawings

Groundsmaster ® 4500-D/4700-D
19245SL Rev A
When servicing or troubleshooting the engine electrical components, use the
correct engine service manual and troubleshooting manual. Also, the Yanmar
SMARTASSIST− Direct electronic control diagnostics service system is available
to support the error diagnosis and maintenance services of engine electrical
control devices.
The Toro TEC controller(s), the Yanmar Engine Controller and the InfoCenter
Display used on the Groundsmaster 4500−D and 4700−D communicate with
each other on a CAN−bus system. Using this system allows the traction unit to
fully integrate all the different electrical components of the traction unit and bring
them 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 integration of electrical
functions also allows the InfoCenter Display to assist with electrical system
diagnostics.
CAN identifies the Controller Area Network that is used between the controllers
on the Groundsmaster. Two (2) specially designed, twisted wires form the
bus. These wires provide the data pathways between the controllers (the TEC
controllers and the Yanmar electronic control unit) and the InfoCenter Display
used on the machine. The engineering term for these wires are CAN High and
CAN Low. At the ends of the twisted pair of bus wires are 120 ohm termination
resistors. One of these resistors is included in the wire harness and the second
is inside the engine ECU.
Each of the components that is controlled by the CAN− bus link needs only four
(4) wires to operate and communicate to the system: CAN High, CAN Low, B+
(power) and ground. The CAN−bus needs the ignition switch ON input for both
the TEC and engine ECU to be activated.
Refer to Appendix A (page A–1)
drawings for Groundsmaster 4500−D and 4700−D machines.
for the electrical schematics and wire harness
Page 6–7 Electrical System: General Information