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 Fiat Chrysler Automobiles (FCA) 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 document has been written defining the SCI communication link from the Tester's point of view.
This specification will be referenced from within SAE J2534-1 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 J2534-1, and constitutes unique Fiat Chrysler Automobiles (FCA) manufacturer-specific requirements.
Rationale
This technical report is being stabilized because it covers technology, products, or processes which are mature and not likely to change in the foreseeable future.
The committee shall increase customer satisfaction and lower product life cycle costs by investigating and recommending standards that will promote more effective diagnosis of vehicle electrical and electronic system problems. The resulting recommended practices will focus on model year 1992 and beyond. However, they may be useful for prior vehicle diagnosis/repair and may serve as a basis for additional recommended practices and pre-model year 1992 vehicles.Vision Statement: A standard disgnostic connector (in a standard location) will be in all vehicles. Pin assignments for a portion of the connector will also be standardized.All vehicles will implement a set of industry standard diagnostic test modes that can be executed over a standard communication data line (i.e., SAE J1850, ISO 9141-2). Industry standard test information will be associated with some of these diagnostic test modes.An OBD II scan tool will be able to utilize a minimum set of standardized diagnostic test modes and test information.A system will be in place that will allow standard electronic access of all E/E diagnostic service information. Future diagnostic legislation will be in harmony with this vision and the resulting SAE Recommended Practices.
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