By Tom Denton
This textbook might help you examine the entire abilities you must cross point three and four car upkeep and service classes from urban and Guilds, IMI and BTEC, and can also be perfect for larger point ASE, AUR and different skills. complex automobile Fault analysis covers the basics of car platforms and parts and explains the newest diagnostic concepts hired in powerful car upkeep and service. Diagnostics, or fault discovering, is an important a part of an car technician’s paintings, and as automobile structures develop into more and more advanced there's a larger want for reliable diagnostics abilities. for college students new to the topic, this ebook might help to enhance those talents, yet also will help skilled technicians in additional bettering their functionality and maintaining with contemporary advancements. In complete color and together with examples of the most recent expertise, this can be the consultant that no scholar enrolled on an automobile upkeep and service direction might be with out. |
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Additional resources for Advanced Automotive Fault Diagnosis
3 Clearing Fault codes can be cleared from the ECU memory in two ways: 1 Using the facilities of a fault code reader (scanner) to clear the memory; 2 Disconnecting the battery earth lead for about two minutes (on some systems this does not work). indd 33 8/18/2011 3:43:16 PM 2 34 Advanced automotive fault diagnosis The f rst method is clearly recommended because disconnecting the battery will also ‘reset’ many other functions such as the radio code, the clock and even the learnt or adaptive functions in the ECUs.
It seems to be worse when the headlights are used This should set you thinking that the cause is probably a faulty batter y, a charging system fault, a parasitic discharge or a starter motor problem (the symptoms would suggest a charging fault is most likely but keep an open mind) Vehicle service history information: Car is ve f years old, has done 95 000 miles Battery probably ok and drive belt adjustment likely to be correct (still suspicious of a charging but has a good ser vice history. A new batter y was ftted one year ago and the cam belt was fault) replaced two years ago Related technical service bulletins: New camshaft drive belt should betted f every 50 000 miles Not connected but it would be good to recommend that the belt was changed at this time Diagnostic procedures performed: Battery voltage and discharge test – ok Drive belt tension – ok (but a bit worn) Alternator charging voltage – 13 V Checked charging circuit for volt drop – ok 14 V is the expected charging voltage on most systems Cause: Alternator not producing correct voltage An auto electrician may be able to repair the alternator but for warranty reasons a new or reconditioned one is often best (particularly at this mileage) Correction: Reconditioned alternator and new drive belt f tted and checked – charging now ok atV14 Note how by thinking about this process we had almost diagnosed the problem before doing any tests, also note that following this process will make us conf dent that we have carried out the correct repair , frst time.
After some practice with the use of colour codes the job of the technician is made a lot easier when faultf nding an electrical circuit. A system now in use almost universally is the terminal designation system in accordance with DIN 72 552. This system is to enable easy and correct connections to be made on the vehicle, particularly in after-sales repairs. Note that the designations are not to identify individual wires but are to def ne the terminals of a device. 8). Ford motor company, and many others, now uses a circuit numbering and wire identif cation system.
Advanced Automotive Fault Diagnosis by Tom Denton