Keyword 2000 Data Line

The Keyword protocols utilize a single wire bi-directional data line between the module and the scan tool. The message structure is a request and response arrangement. Keyword 2000 is used for scan tool diagnostics only. The modules do not exchange data on these systems.

The Keyword 2000 serial data line:

• The Keyword 2000 serial data line allows the following components to communicate data with the scan tool:
  • The engine control module (ECM)
  • The transmission control module (TCM)
  • The intelligent switching unit (ISU)
  • The electronic brake control module (EBCM)
• The Keyword 2000 serial data line allows a scan tool to communicate with these modules for diagnosis and testing.