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 or avid DIY mechanic the different ways to go about diagnosing automobiles. Special attention is given to specific systems and different makes and models. The different real life diagnostic cases are explained from narrated perspective to make learning easier. Hopefully you find this section enlightening and productive. Enjoy your readings. Table of Contents * - Audi data bus signal recognition (exposes the intricacies of diagnosing vehicle networks and how computers talk to each other.) * - Cadi idle re-learn (explains the importance of module re-learn procedure, which is done by re-adapting the ECM to a new sensor.) * - Case of the EVAPs (these emission systems are difficult to diagnose, due to their complexities.) * - Computer Data Lines (scan tools talk to the different engine modules or computers through the data line or bus. See how to diagnose this type of problem.) * - Faulty EGR operation (the EGR is in charge of lowering combustion temperatures. But issue with this system can cause pinging, performance, misfire and countless other issues.) * - Lean (dirty) MAF (the lean condition comprises about 60% of all engine performance issues. Learn to deal with this situation.) * - The case of the low volume (Fuel pumps deliver both pressure and volume. If one of these is missing then the engine has problems.) * - Unsynchronized CAM & CRK signals (CAM and CRK signal synchronization is needed for the engine to start.) * - Wrong MAP reading (The manifold air pressure is a main input to the ECM. See how this sensor creates havoc with the engine.) * - The Cadi's dual crank affair (this Cadillac's engine control system has dual crank sensors. Learn to diagnose these systems.) * - Analytical misfire code (Misfires are difficult to diagnose and this case shows precisely that.) * - The misfire ghost (A case of hard to find misfire.)