Purpose - The purpose of this SAE Information Report is to specify the requirements necessary to fully define the Serial Data Communication Interface (SCI) used in the reprogramming of emission-related powertrain Electronic Control Units (ECU) in DaimlerChrysler Corporation (Chrysler Group) vehicles. It is intended to satisfy new regulations proposed by the federal U.S. Environmental Protection Agency (EPA) and California Air Resource Board (CARB) regulatory agencies regarding "pass-thru programming" of all On-Board Diagnostic (OBD) compliant emission-related powertrain devices. These requirements are necessary to provide independent automotive service organizations and after-market scan tool suppliers the ability to reprogram emission-related powertrain ECUs for all manufacturers of automotive vehicles.

Specifically, this document details the SCI physical layer and SCI data link layer requirements necessary to establish communications between a diagnostic tester and an ECU. It further specifies additional requirements for the application of a flash strobe voltage multiplexed on the SCI communication link for purposes of ECU reprogramming. This document does not specify the content or meaning of the application messages or diagnostic protocol to be transmitted on the SCI communication link. It only defines a generic method to transfer data between a diagnostic tester and an ECU, regardless of application messaging structure.

This specification will be referenced from within SAE J2534 Pass-Thru Programming as a technical information report. In this regard, the inclusion of the SCI communication link is in addition to the approved OBD communication links previously specified in SAE J2534, and constitutes unique DaimlerChrysler Corporation (Chrysler Group) manufacturer-specific requirements.

Applications - This document shall strictly apply to DaimlerChrysler Corporation vehicles developed and manufactured exclusively by the former Chrysler Corporation, and for purposes of clarification, referred to herein as DaimlerChrysler Corporation (Chrysler Group). This document shall not apply to other DaimlerChrysler Corporation vehicles or subsidiaries, including products developed and manufactured by Mercedes-Benz, Smart, or Mitsubishi Motors Corporation. The SCI communication link defined herein shall apply to OBD vehicles retroactive to the 1994 model year.

History - DaimlerChrysler Corporation (Chrysler Group) introduced flash technology into emission-related powertrain ECUs beginning in the 1993 model year. Flash technology consisted of implementing reprogrammable memory devices into powertrain ECUs for purposes of updating software functionality and calibrations in the customer field (service environment), assembly plant (manufacturing environment), and vehicle development (engineering environment). Reprogramming events in the field require strict compliance to corporate guidelines based on the following criteria:

Vehicle performance / driveability

Vehicle safety

Vehicle emissions

Vehicle fuel economy

Customer satisfaction

The DaimlerChrysler Corporation (Chrysler Group) corporate flash strategy consists of incorporating proprietary standards and requirements into the flash process. These requirements involve the integration of multiple levels of protective security measures using software and hardware lockout techniques including additional safeguard mechanisms controlled via internal corporate processes and corporate test tools. New regulations will force a change in the current DaimlerChrysler Corporation (Chrysler Group) flash strategy and process.

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