Caterpillar 320D-336D Excavator Electronic Service Manual
320D-336D HYDRAULIC EXCAVATORS -TIER III ENGINES
ELECTRONIC CONTROL SYSTEM AND MONITOR
AUDIENCE
Level II – Caterpillar Service personnel who understand the principles of machine systems operation, diagnostic equipment, and procedures for testing and adjusting.
CONTENT
This presentation contains the information and visuals necessary to develop a Level II course of instruction on the Electronic Control Unit (ECU) for the 320D-336D Hydraulic Excavators. Emphasis is placed on explaining how the ECU and Monitor Panel function. The Data and Calibration Modes.
OBJECTIVES: Caterpillar 320D-336D Excavator Electronic Service Manual
After learning the information in this presentation, the serviceman will be able to:
- locate and identify the major components of the ECU and monitor panel system;
- identify all input and output signals for the ECU and monitor panel;
- explain the function and operation of each major component; and
- explain and demonstrate how to access the built-in diagnostic procedures.
REFERENCES:
320D Hydraulic Excavator Specalog AEHQ5856
324D Hydraulic Excavator Specalog AEHQ5663
325D Hydraulic Excavator Specalog AEHQ5665
328D Hydraulic Excavator Specalog AEHQ5706
330D Hydraulic Excavator Specalog AEHQ5667
Machine Monitoring System – Systems Operation RENR8068
Self-study “300D Series Hydraulic Excavators, 345C Hydraulic Excavator,
and 365C & 385C Large Hydraulic Excavators SERV7032
iTIM ” ‘300C’ Series Hydraulic Excavators-Electronic Control Systems” SERV2693
iTIM “325C Hydraulic Excavators-Hydraulic Systems” SERV2701
325D Hydraulic Schematic KENR6157
Caterpillar Hydraulics Course (or equivalent) SEGV2519
ELECTRONIC CONTROL SYSTEM: Caterpillar 325D 328D 330D Excavator Service Manual
The Electronic Control System controls many of the functions of the 320D-336D Excavators
and is pretty much the same system for the 311D to the 345D.
The electronic control system uses two data links to communicate:
- The Engine ECM, the Machine ECM, the monitor, Cat ET, the optional Product Link ECM (PL321SR), and the Gateway WorldViewer ECM (PL300) communicate via the Cat Data Link.
- The soft switch panel communicates with the Machine ECM and the monitor on the J1939 CAN Data Link. The switch panel is not connected to the Cat Data Link.
For the Machine Security System, the software is part of the Machine ECM. An MSS key reader provides input into the Machine ECM through the Can Data Link.
Cat ET is used to diagnose system problems via the Cat Data Link.