Advanced Automotive Fault Diagnosis by Tom Denton

By Tom Denton

This textbook might help you examine all of the abilities you must move point three and four car upkeep and service classes from urban and Guilds, IMI and BTEC, and is usually excellent for larger point ASE, AUR and different skills. complicated automobile Fault analysis covers the basics of auto structures and parts and explains the most recent diagnostic options 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 platforms turn into more and more advanced there's a larger want for stable diagnostics abilities. for college kids new to the topic, this publication may help to advance those talents, yet also will support skilled technicians in additional enhancing their functionality and maintaining with fresh advancements. In complete color and together with examples of the most recent expertise, this is often the consultant that no scholar enrolled on an automobile upkeep and service path can be with no. |

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Indd 34 8/18/2011 3:43:17 PM Diagnostic techniques 2 35 Once a complex set of interacting parts such as a motor vehicle has been ‘systemised’, the function or performance of each part can be examined in more detail. In other words, what each part of the system should do in turn helps to determine how each part actually works. It is again important to stress that the links and interactions between various sub-systems are a very important consideration. Examples of this would be how the power demands of the vehicle lighting system will have an effect on the charging system operation, or in the case of a fault, how an air leak from a brake servo could cause a weak air/fuel ratio.

6 Engine noises How do you tell a constant tapping from a rattle? Worse still, how do you describe a noise in a book? I’ll do my best. 5). 6 Engine noises Sources of engine noise Possible cause Required action Misf ring/backf ring Fuel in tank has wrong octane/cetane number , or is wrong type of fuel Ignition system faulty Engine temperature too high Carbon deposits in the combustion chamber start to glow and cause misf ring Timing incorrect, which causes misf ring in the intake/exhaust system Determine which type of fuel was last put in the tank Check the ignition system Check the engine cooling system Remove the carbon deposits by using fuel additives and driving the vehicle carefully Check the timing Valve train faulty Valve clearance too large due to faulty bucket tappets or incorrect adjustment of valve clearance Valve timing incorrectly adjusted valves and pistons are touching Timing belt broken or damaged Adjust valve clearance if possible and renew faulty bucket tappets – check cam condition Check the valve timing and adjust if necessar y Check timing belt and check pistons and valves for damage – renew any faulty parts Engine components faulty Pistons Piston rings Cylinder head gasket Big-end and/or main bearing journals Disassemble the engine and check components Ancillary components Engine components or ancillar y components loose or broken Check that all components are secure, tighten/ adjust as required.

The purpose of this set process is to ensure that ‘we’ work in a set, logical way. 1 Introduction Key fact Stop and think before pulling the vehicle to pieces. This section is again a way of changing how you approach problems on a vehicle. The key message is that if you stop and think before ‘pulling the vehicle to pieces’, it will often save a great deal of time. In other words, some of the diagnostic work can be done ‘on paper’ before we start on the vehicle. To illustrate this, the next section lists symptoms for three separate faults on a car and for each of these symptoms, three possible faults.

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