MAHLE Test Systems Over 9000 Dealership Locations 46 Vehicle Manufacturing Plants 5 Continents 32 Languages 65 Vehicle Lines >8 Million Vehicles Tested/Year
History ECM Aftermarket Tool Manufacturers OEMTool Engineering ETI Clear Codes, Read Codes, Read Data Communication Setup You must supply them the “data”
History ECM Aftermarket Tool Manufacturers OEMTool Engineering ETI Code List Data Stream Communications Info Information Needed By Tech No Problem!
History Gateway Aftermarket Tool Manufacturers OEMTool Engineering ETI Code List Data Stream Communications Info Buss ECU’s are on Special procedures Reprogramming Learn and Setup procedures Service Information Data Information Needed By Tech You must supply them the “all the data” VIN Diagrams Lots of “questions” about vehicle (ie Heated Seats? Dinglehopper position?) Output Control Data Data Sharing Information ECU selection Special security interfaces Cross-ECU testing ECM BCM ??? ?
History The number of ECU’s has risen greatly (from 1 to over 100) The electrical architecture has become very complex (from a single line to many lines on many gateways to many ECUs). The amount of data each ECU can access is much greater (from 10 to over 1000) The number of functions that must be performed to diagnose a vehicle has greatly increased (from 3-5 to hundreds)
Diagnostic Data Simple data was stored in a simple format Year Make Model ECU Data Stream DTCs Comm Info All information needed to identify the correct set of information for a vehicle could be derived from the VIN or from asking the repairman
Diagnostic Data The huge increase in complexity of the vehicle caused the OEMs to store their information in ever more complex ways in order to retain the ability to handle such large volumes of complex information ECU information is stored in a “virtual” ECU shared by many vehicles with only some differences Vehicle information is stored in a “virtual” vehicle shared by many physical vehicles with only some differences These differences are controlled by rules.
Diagnostic Data Year Make Model PCM1 Data Stream DTCs Comm Info PCM Engine Size Engine Family Part Number Engine Size Engine Family Part Number PCM2 Data Stream DTCs Comm Info PCM ‘N’ Data Stream DTCs Comm Info Data Stream Rules DTC Rules Comm Info Rules Data Stream Rules DTC Rules Comm Info Rules Data Stream Rules DTC Rules Comm Info Rules Rule based data relationships are complex Information needed to resolve the rules is difficult or impossible for a repairman to answer OEM tool strategies used to resolve the rules are not always documented In addition to the diagram, several other items can be rule controlled Output controls, their pre- conditions, run conditions, and final reset functions Test menu and sub menus Configuration/Setup data
Diagnostic Data There are other systems that must also be used which have a host of input variables required in order to accurately resolve their rules: Security Systems As Built/As Configured systems ECU Reprogramming Systems Information Systems
Possible Solutions ECU Data Standardized Ruie Input Shop Tool Vehicle Build System As Built/As Configured Security Systems ECU Programming Standardized Build Interface Information System Standardized Data Interface Standardized VCI Interface (J2534/J22900) VCI Device
Challenges Different OEM’s store their information in different tool architectures Putting the data into a standard flexible enough to hold any kind of OEM data for any kind of ECU is very challenging (and expensive) This data format is not useful to the OEM (beyond their current formats) so the charge would likely be passed through to the aftermarket OEM Scan Tool Data OEM Build Interface Different OEM’s store their information in different formats OEM Rule Interface Aligning all systems with the exact same input (ie “Year” is different than “MY”)
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