GUIDE-VALVE 3223664 - Caterpillar

Illustration 1 g01386549
Data Link ConnectionsThe CAN A J1939 data link is a communication link that is used for the movement of data between the Machine Electronic Control Module (ECM) and the instrument cluster. The CAN A J1939 data link has the following characteristics:
Bidirectional
Input of information from the machine ECM
Output of information from the machine ECMThe CAN A J1939 data link consists of the following parts:
Internal circuits of the machine ECM
Related harness wiring
Service tool connectorThe CAN A J1939 data link and the machine ECM are connected at pin J2-67 and pin J2-68.The machine ECM and the Monitoring System use data that is sent back and forth on the CAN A J1939 data link. The following information is some of the information that is shared:
The machine ECM sends signals to the Monitoring System. The Monitoring System uses the signals to report on the status of the machine electronic control system. The Monitoring System alerts the operator of the status by illuminating the corresponding alert indicator.ReferenceFor more information on the signals that are sent by the machine electronic control module (ECM), refer to the Systems Operation, "Input Components" Section of this manual. Component and Data Link Configurations
Table 1 shows the data links that are used for the different electronic devices in the machine.
Table 1
Configuration of the Components and the Data Links    
Component    Data Links    
A4:M3 Machine Electronic Control Module     CDL, CAN A J1939    
Instrument Cluster     CAN A J1939    
MSS A4 TRM (Bouncer)     CAN A J1939    
ET(PC based via communication adapter)     CDL    
Winflash (PC based via communication adapter)     CDL, CAN A J1939    Interface of the Instrument Cluster Via CAN A J1939
The components that are shown in Table 2 are interfaced to the instrument cluster via CAN A J1939.
Table 2
Interface of the Instrument Cluster Via CAN A J1939    
Features of the Display and the Indicator    Source ECM    
Low Engine Oil Pressure     MCM    
Cold Starting Aid (Wait to Start Lamp)     MCM    
The Parking Brake Engaged.     MCM    
Fault indicator
Lamp That Resembles a Yellow Diamond     MCM    
The Forward Indicator "F"     MCM    
The Neutral indicator "N"     MCM    
The Reverse Indicator "R"     MCM    
Continuous Flow Indicator     MCM    
Differential Lock     MCM    
Odometer     MCM    
Hour Meter     MCM    
Coolant Temp     MCM    
Hyd Oil Temp     MCM    
Low Hydraulic Oil Pressure     MCM    
Gear Indicator     MCM    
Audible Alert Alarm     MCM    
MSS Indicator     MCM    
Creeper Status Indicator     MCM    Wired Interface of the Instrument Cluster
The components that are shown in Table 3 are wired to the instrument cluster directly from the components of the machine.
Table 3
Wired Interface of the Instrument Cluster    
Features of the Display and the Indicator    Input type    
Fuel Level Indicator
Warning of the Fuel Level     Analog    
Hydraulic Filter Bypass     STG    
Warning For Alternator Charge     STG