UDS Protocol Interview Questions

UDS Protocol Interview Questions

  • Priyag Chaudhary
  • 07th Jun, 2022

UDS Protocol Interview Questions

1) What is UDS Protocol?

UDS stands for Unified Diagnostic Services. It is a diagnostic communication protocol used in electronic control units (ECUs) within automotive electronics, which is specified in the ISO 14229-1.

2) What are uds services?

UDS services is a protocol used by diagnostic systems to communicate with ECUs in vehicles. The protocol is used to diagnose errors and reprogram ECUs.

3) Explain uds frame format?

UDS protocol is works on the CAN protocol so that the maximum 8-bytes of the data can be requested and get to the response in a message. Like CAN protocol, in UDS protocol, there are 2-types of the frames are available.

  • Diagnostic request Frame (With/without Sub-function-ID)
  • Diagnostic Response Frame

4) Explain periodic message types of UDS?

Unacknowledged Segmented Data Transfer (USDT) and Unacknowledged Un-segmented Data Transfer (UUDT) are periodic message types of UDS.

5) List some uds negative response codes?

Below is the list some uds negative response codes

  • 0x10 – General Reject
  • 0x11 – Service Not Supported
  • 0x12 – Subfunction Not Supported
  • 0x13 – Incorrect Message Length or Invalid Format
  • 0x14 – Response too long
  • 0x21 – Busy Repeat Request
  • 0x22 – Conditions Not Correct
  • 0x24 – Request Sequence Error

6) What is dcm autosar?

DCM (Diagnostic Communication Manager) is a Autosar module in ECU software that handles the tester diagnostics functionalities like UDS, KWP, and OBD, etc.

7) What is a diagnostic protocol?

A diagnostic protocol defines a set of conventions used for diagnostic communication between a diagnostic device and an ECU in the vehicle

8) List categories of services offered by UDS Protocol Stack?

List of categories of services offered by an ISO 14229 UDS Protocol Stack are

  • Data Transmission Capabilities
  • Fault Diagnostics
  • Upload/Download Capabilities
  • Remote Routine Activation

9) What is NRC in UDS?

NRC stands for Negative Response Codes that is used by UDS in the diagnostic re- response to indicate the tester that a certain failure has occurred and the diagnostic request need to be initiated.

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