j1939

I have CAN database (dbc file). It's a text file. The extension of this file is dbc. When it is opened in Vector CANdb++ Editor, J1939 messages and CAN IDs are populated. However, some of the CAN IDs that are in the CANdb++ Editor could not be found in the .dbc text file, I open the .dbc...

Consider a truck. The Electronic Brake Systems (EBS) ECU receives following message from some other ECU. Please explain this message. From where does some other module acquire the Suspect Parameters Number (SPNs) to send to EBS ECU. What does EBS do with the SPNs it receives?

Please consider CAN communication network in a heavy vehicle: Steering Electronic Control Unit (ECU) has CAN 2.0B. It doesn't have J1939 stack. All other ECUs in this network are implemented with J1939 stack. Can CAN 2.0B coexist with J1939? What code changes are needed in steering ECU and...

How does messaging work in CAN FD? How are PGNs and SPNs defined for CAN FD? For Extended CAN, SAE J1939-71 defines PGNs and SPNs. All the PGNs and SPNs defined in SAE J1939-71 don't apply to CAN FD? For example, in SAE J1939-71 PGN 65267 is Vehicle Position. There are two SPN's in this...

Please consider Electro Hydraulic Power Steering (EHPS) System installed in a commercial truck. It has dual motors and dual pumps and dual pump Electronic Control Units (ECUs). These pump ECUs communicate with other ECU over public J1939 network. Embedded steering software executes in pump...

Hi everyone, I don't know why but I'm having a tough time decoding CAN Bus data frames, even after looking at many sources showing bit field diagrams of how the data is supposed to be structured. Background on project/goal My main goal is to connect directly to an electronic turbo actuator...