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    Automotive Repair Case Studies
    Automotive Repair Case Studies
    Automotive Repair Case Studies
    Ebook59 pages40 minutes

    Automotive Repair Case Studies

    By Mandy Concepcion

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    About this ebook

    Automotive Repair Case Studies
    (Diagnostic Strategies of Modern Automotive Systems)
    By Mandy Concepcion

    In this section, we'll take a look at automotive diagnostics in action. An effort has been made to look at problems in different ways, in each of the examples. Although there are many ways to perform the same task, the idea here is to show the technician the different ways to go about diagnosing automobiles. Hopefully you find this section enlightening and productive. Enjoy your readings.

    Table of Contents

    * - Audi data bus signal recognition
    * - Cadi idle re-learn
    * - Case of the EVAPs
    * - Computer Data Lines
    * - Faulty EGR operation
    * - Lean (dirty) MAF
    * - The case of the low volume
    * - Unsynchronized CAM & CRK signals
    * - Wrong MAP reading
    * - The Cadi's dual crank affair
    * - Analytical misfire code
    * - The misfire ghost

    About the Author:

    Mandy Concepcion has worked in the automotive field for over 21 years. He holds a Degree in Applied Electronics Engineering as well as an ASE Master & L1 certification. For the past 16 years he has been exclusively involved in the diagnosis of all the different electronic systems found in today's vehicles. It is here where he draws extensive practical knowledge from his experience and hopes to convey it in his books. Mandy also designs and builds his own diagnostic equipment, DVD-Videos and repair software.

    LanguageEnglish
    PublisherMandy Concepcion
    Release dateFeb 16, 2012
    ISBN9781466012363
    Automotive Repair Case Studies
    Author

    Mandy Concepcion

    Mandy Concepcion has worked in the automotive field for over 28 years. He holds a Bachelor's Degree in Electronics Engineering as well as an ASE Master & L1 certifications. For the past 19 years he has been exclusively involved in the diagnosis of all the different electronic systems found in today's vehicles. It is here where he draws extensive practical knowledge from his experience and hopes to convey it in his books, equipment, and gadgets he designs. Mandy designs and builds his own diagnostic equipment, DVD-Videos and repair software.

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      Book preview

      Automotive Repair Case Studies - Mandy Concepcion

      Preface

      In this section, we’ll take a look at automotive diagnostics in action. An effort has been made to look at problems in different ways, in each of the examples. Although there are many ways to perform the same task, the idea here is to show the technician the different ways to go about diagnosing automobiles. Hopefully you find this section enlightening and productive. Enjoy your readings.

      Automotive Repair Case Studies

      Diagnostic Strategies of Modern Automotive Systems (Section 9 Contents)

      Table of Contents

      * - Audi data bus signal recognition

      * - Cadi idle re-learn

      * - Case of the EVAPs

      * - Computer Data Lines

      * - Faulty EGR operation

      * - Lean (dirty) MAF

      * - The case of the low volume

      * - Unsynchronized CAM & CRK signals

      * - Wrong MAP reading

      * - The Cadi’s dual crank affair

      * - Analytical misfire code

      * - The misfire ghost

      ****

      CASE STUDIES

      Section 1 - AUDI DATA BUS SIGNAL RECOGNITION

      This was a 1999 Audi A4 Quatro with a 1.8L TC engine that was having a hard time communicating with the scanner. The dash lights for the ABS, SRS and brakes were on all the time. The engine always started, but the customer wanted to solve the dash lights problem. Communication was never attained with the ECM module, ABS, SRS or with some of the other less common modules. The instrument cluster module however was communicating, with only an ABS code for No communication. One of the first diagnostic questions was; why were the other modules not communicating with the scanner? Why weren't any other codes present for the other modules? And what was the system data bus signal parameters supposed to be?

      At this point I knew that the key to solving this vehicle's dash lights problem was to properly diagnose the data bus fault. In modern automobiles, the data bus is the communication highway through where all present modules communicate. A faulty or shorted module can bring down the data bus and the rest of the modules with it.

      tmp_d8872636fc0428bbc252f90030930e1d_CKUMIU_html_1ace7e00.jpg

      Fig 1 - Defective K-Line data bus signal.

      I started the diagnostics by base lining the system, by simply taking a reading before the diagnostics process is started. This way the results can be compared once the repair is done.

      I scoped the data bus at the DLC connector PIN # 7 to capture the waveform for later comparison. See Fig 1. The VW/AUDI vehicle line uses what's called the K-LINE to communicate with the scan tool. This K-Line however is not used for internal module to module communications. The vehicle’s modules do not care whether this K-Line is down or not. It is only used for scanner diagnostics communications. All modules use a different set of wires for inter-module communication.

      Fig. 1 shows the waveform capture of the bad diagnostics K-Line. It shows the K-Line diagnostics data bus signal while the scanner was trying to communicate with the ECM. The three digital pulses belong to the scan tool grounding the K-Line. Each

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