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AGS features were introduced in 1994 with the A5S560Z transmission. AGS control consists of adaptive features that will modify transmission operation according to various factors. AGS operation can be influenced by two major functional groups: • Driver influenced features (influenced by throttle and kickdown input) • Environmental influences (such as road conditions - icy, traffic etc.). The driving program selection is not adapted on a long term basis - nor is it stored in the control module memory when the ignition is switched off. It continually changes as the driver of the vehicle changes driving habits. Diagnosis and Troubleshooting Due to the cost and complexity of today’s electronic transmissions, BMW recommends that the technical hotline be contacted before any repairs are performed. It is important that the technician perform some basic diagnostic procedures before contacting technical assistance. The following procedures should be followed: Always Verify customer complaint, make sure the complaint is not related to normal operation. (i.e. Warm Up Phase, AGS operation etc.). Survey Fault Memory - Perform complete quick test. There may be other systems that interface with EGS that could cause faults. (i.e DME, ASC/DSC, IKE/Kombi etc.). Print out all fault code with fault conditions. Also print out copy of Identification page and diagnostic report. Establishing a Diagnostic Plan. Analyze the Problem - Once the complaint has been verified, then all available resources should be used to find the “root cause” of the complaint. Start out by checking Service Information Bulletins, DCS messages, and Service Roundtable information. Use the DISplus or GT-1 to access the diagnostic program and per form Diagnostic Test Modules where applicable. Electrical Troubleshooting Manuals (ETM’s) should also be used when needed. Fault Codes When diagnosing transmission fault codes, always print out the fault code(s) and the fault conditions. When referring to the fault code itself, be aware that there are actually 3 formats for the fault code.

Tags : automatic transmission service, electronic transmissions, diagnostic plan, information bulletins, adaptive features, vehicle changes, diagnostic report, checking service, fault conditions, program selection, diagnostic program, test modules, environmental influences, customer complaint, functional groups

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