What is the difference between OBD and UDS?

Both the OBD and UDS protocols are focused on diagnostics, but comparing them is not really correct. UDS is designated for the offline diagnostics of vehicle malfunctions at a service station, while OBD is an onboard self-diagnosis service for ECUs that analyzes the engine’s harmful emissions.

What is the difference between CAN and J1939?

1 Answer. There is no difference between CAN and J1939. J1939 build on top of CAN 2.0b. When some device sends a big message using the J1939 Transfer protocol (J1939.TP) using BAM other devices can accept this message or ignore it.

CAN Id be UDS?

UDS via CAN is specified in the DoCAN ISO-15765-2 part and describe the network and transport layer for a functional (broadcast) and physical (p2p) communication between ECUs or better control functions. Normal CAN id’s don’t implement any network functionalities like a addressing.

Can you use can protocol to transfer media?

This concept is used in transmission media access. If multiple ECUs are connected and sharing the same transmission medium to transfer its data. So if they (multiple nodes) start transmission at the same time, then there is the possibility of collision and data corruption.

What is the difference between on-board and off board diagnosis?

While on-board vehicle diagnostics protocols like OBD/OBD2 are tasked primarily with emission related diagnosis, off-board vehicle diagnostics (UDS, KWP etc.) handle the diagnostics related to every other vehicle ECU (Electronic Control Unit).

CAN AND CAN FD difference?

The primary difference between the classical CAN (Controller Area Network) and CAN FD is the Flexible Data (FD). The message payload size has been increased to 64 bytes of data in each CAN-frame / message, compared to only 8-bytes in the classic CAN frame. CAN FD can handle CAN frames/messages with 11-bit ID as well.

Is UDS in Spanish plural?

ustedes
Uds. = Short for ustedes, Uds. (listen) is conjugated in the third person plural. In Spain, it’s used to show respect, distance, etc. to a group. Everywhere else, it’s just used to indicate that you’re talking to more than one person.