Electrical/Control Systems Electrical Control System
Horn, HVAC Fan, DEF System, and Engine Relays in Fuse/Relay Boxes
Electrical Control System General Information 85
87
The electronic control system in the machine uses a combination of switches/relays and computer-based components.
86
The computer-based components communicate with each other using a Controller Area Network (CAN) communication protocol.
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CAN System General Information
Main Power Relay 87
The electrical system uses the SAE J1939 standard for Controller Area Network (CAN) communication and diagnostics.
30
86
CAN is a message-based protocol, allowing communication between devices without the need for a host computer. It provides communication between control system components used throughout the machine. 85
Devices communicate with each other through a two-wire, serial bus connection (CAN high and CAN low). The wires are 120 ohm nominal twisted pair.
Fig. 537 – Relay Continuity Testing
The main components of the CAN system are: • Multi-function Control Module (Controller 3) • Engine Control Module (ECU) • Main Power Relay 2 • Lift Arm and Standard Auxiliary Flow Control Module (Controller 1) • Control Module (R) (Controller 2) • High-Flow Module (Option) • Multi-Function Display CAN allows various devices on the network coordinate functions. For example, CAN messages generated by the multi-function control module are acted upon by the ECU (or vice-versa) to coordinate engine control. Printed in U.S.A.
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50940165/C0718
