Presentation is loading. Please wait.

Presentation is loading. Please wait.

Permission granted to reproduce for educational use only. 2 © Goodheart-Willcox Co., Inc. Chapter 13 Troubleshooting Techniques.

Similar presentations


Presentation on theme: "Permission granted to reproduce for educational use only. 2 © Goodheart-Willcox Co., Inc. Chapter 13 Troubleshooting Techniques."— Presentation transcript:

1

2 Permission granted to reproduce for educational use only. 2 © Goodheart-Willcox Co., Inc. Chapter 13 Troubleshooting Techniques

3 Permission granted to reproduce for educational use only. 3 © Goodheart-Willcox Co., Inc. Objectives Explain the basic principles of driveability diagnosis. Evaluate driver input concerning vehicle problems. Make visual checks for underhood problems. Perform a road test. Describe the basic methods of diagnosing driveability problems caused by engine systems.

4 Permission granted to reproduce for educational use only. 4 © Goodheart-Willcox Co., Inc. Objectives Explain the basic methods of diagnosing driveability problems caused by the vehicle drive train. Describe the basic methods of diagnosing driveability problems caused by computer control systems. List factors to be considered when deciding to adjust, rebuild, or replace parts.

5 Permission granted to reproduce for educational use only. 5 © Goodheart-Willcox Co., Inc. Troubleshooting Ability to accurately troubleshoot separates successful automotive technicians from parts swappers Ability to apply logical diagnostic process can be improved with study and experience

6 Permission granted to reproduce for educational use only. 6 © Goodheart-Willcox Co., Inc. Evaluating Customer Input Obtaining information from driver is first and most important part of diagnosis Often allows some preliminary testing to be bypassed Allows technician to focus on most likely source of problem

7 Permission granted to reproduce for educational use only. 7 © Goodheart-Willcox Co., Inc. Driver Input Try to talk to person who normally drives vehicle Try to get accurate description of problem before beginning any work Driver can usually provide some idea of past service problems and maintenance Carefully evaluate what driver says

8 Permission granted to reproduce for educational use only. 8 © Goodheart-Willcox Co., Inc. Driveability Worksheet

9 Permission granted to reproduce for educational use only. 9 © Goodheart-Willcox Co., Inc. Assessing Driver Input Try to estimate drivers attitude and level of automotive knowledge Driver can unintentionally mislead technician Pay attention to: Hand gestures Body language Simulation of noises heard

10 Permission granted to reproduce for educational use only. 10 © Goodheart-Willcox Co., Inc. Assessing Driver Input Most customers are not familiar with automobile operation Never accept drivers diagnosis until you verify it Driver may be overreacting to normal condition

11 Permission granted to reproduce for educational use only. 11 © Goodheart-Willcox Co., Inc. Assessing Driver Input Owner may downplay symptoms, hoping for inexpensive repair Never give uninformed estimates, even if problem seems obvious Explain to customer diagnostic charge is more cost effective than paying for service that may not fix problem

12 Permission granted to reproduce for educational use only. 12 © Goodheart-Willcox Co., Inc. Difficult People Reasons for anger or hostility vary Problem was not solved during previous visit Customer fears repairs will be too expensive Customer is upset over inconvenience Customer is in bad mood unrelated to vehicle problem

13 Permission granted to reproduce for educational use only. 13 © Goodheart-Willcox Co., Inc. Difficult People Dealing with customers requires tact and understanding Talk in calm tones Avoid getting angry yourself Keep owner informed about repair process as frequently as possible

14 Permission granted to reproduce for educational use only. 14 © Goodheart-Willcox Co., Inc. Difficult People Allow customers to feel they are part of diagnostic and repair process Once problem is located, inform customer of cause and what is needed to correct problem If practical, show customer defective part and explain why it is defective

15 Permission granted to reproduce for educational use only. 15 © Goodheart-Willcox Co., Inc. Work Order Legal contract with vehicle owner Fill out completely, even for simple services Begin work order by listing date and filling out: Customer information Vehicle information, including VIN

16 Permission granted to reproduce for educational use only. 16 © Goodheart-Willcox Co., Inc. Work Order After work is finished, list: All work performed Labor time Labor cost Parts needed and cost of parts Total of any subcontracted work Supply charge Disposal fees

17 Permission granted to reproduce for educational use only. 17 © Goodheart-Willcox Co., Inc. VIN Numbers

18 Permission granted to reproduce for educational use only. 18 © Goodheart-Willcox Co., Inc. Emission-Certification Label Located in engine compartment Contains information on: Recommended spark plug gap Ignition timing Routing diagram for hoses

19 Permission granted to reproduce for educational use only. 19 © Goodheart-Willcox Co., Inc. Road Testing Road testRoad test may: Reveal or confirm driveability problems Indicate specific problem areas and what further tests need to be made Determine that perceived driveability condition is normal, and no further testing is needed

20 Permission granted to reproduce for educational use only. 20 © Goodheart-Willcox Co., Inc. Road Testing Some problems can only be found by road testing Most problems reveal themselves in less than 15 minutes When possible, try to duplicate exact conditions under which driver says problem occurs

21 Permission granted to reproduce for educational use only. 21 © Goodheart-Willcox Co., Inc. Road Testing Always try to road test with owner Ensures owner and technician are talking about same problem Saves valuable time Avoids diagnosis and repair of problem that does not fix what customer wanted fixed

22 Permission granted to reproduce for educational use only. 22 © Goodheart-Willcox Co., Inc. Road Test Safety Considerations Before beginning road test, check to ensure vehicle can be safely driven Check: Exterior damage Tire inflation and condition Turn signals, brake lights, horn Brake pedal Steering wheel

23 Permission granted to reproduce for educational use only. 23 © Goodheart-Willcox Co., Inc. Road Test Safety Considerations Address any safety-related equipment problems before road testing Check vehicle fuel level Wear seat belt at all times If radio is on, turn it off

24 Permission granted to reproduce for educational use only. 24 © Goodheart-Willcox Co., Inc. Road Test Safety Considerations Drive slowly when leaving service area Ensure brakes and steering are working properly Ensure no other problems exist that could cause personal injury or vehicle damage

25 Permission granted to reproduce for educational use only. 25 © Goodheart-Willcox Co., Inc. Road Test Safety Considerations Obey all traffic rules Be alert while driving If necessary to monitor scan tool readings or look for problem while vehicle is driven, have assistant drive as you monitor the situation

26 Permission granted to reproduce for educational use only. 26 © Goodheart-Willcox Co., Inc. Road Testing Procedures Try to duplicate normal driving conditions Light and heavy acceleration Deceleration Braking Different cruising speeds

27 Permission granted to reproduce for educational use only. 27 © Goodheart-Willcox Co., Inc. Road Testing Procedures Note response of engine and related systems Be alert for: Noises or vibrations Harshness Engine miss or hesitation Transmission shifts Operation of brake and steering systems

28 Permission granted to reproduce for educational use only. 28 © Goodheart-Willcox Co., Inc. Road Testing Procedures When specific problem is identified, look for conditions related to problem Note if other vehicle parts or driving conditions affect problem Note all factors related to problem before returning to shop

29 Permission granted to reproduce for educational use only. 29 © Goodheart-Willcox Co., Inc. Diagnosing Intermittent ProblemsIntermittent Problems Very difficult to diagnose Usually occur only under certain conditions Can be related to: Temperature Humidity Certain vehicle operations In response to certain tests by ECM

30 Permission granted to reproduce for educational use only. 30 © Goodheart-Willcox Co., Inc. Diagnosing Intermittent Problems Try to recreate exact conditions under which problem occurred If road testing does not duplicate problem, other types of testing will need to be done Essential to closely follow principles of strategy-based diagnostics

31 Permission granted to reproduce for educational use only. 31 © Goodheart-Willcox Co., Inc. Performing Visual Inspections Check for visible problems before performing diagnostic tests Use sight, smell, hearing If problem is not related to cold operation, leave engine running at first Stop engine before investigating any part near hot or moving parts

32 Permission granted to reproduce for educational use only. 32 © Goodheart-Willcox Co., Inc. Performing Visual Inspections (Ford)

33 Permission granted to reproduce for educational use only. 33 © Goodheart-Willcox Co., Inc. Performing Visual Inspections While under hood, check level and condition of: Engine oil Coolant in recovery tank Automatic transmission fluid Note any leaks Note any disconnected hoses or air intake ducts

34 Permission granted to reproduce for educational use only. 34 © Goodheart-Willcox Co., Inc. Performing Visual Inspections Check air and PCV filters for clogging Make sure PCV valve and hose are not plugged Check condition of drive belts, especially alternator belt If engine has serpentine belt, check condition of belt tensioner

35 Permission granted to reproduce for educational use only. 35 © Goodheart-Willcox Co., Inc. Performing Visual Inspections Look for prior work on vehicle if no history available Signs of abuse or tampering Any engine part that has been removed or replaced by non-stock parts Aftermarket add-on equipment that can affect vehicle operation

36 Permission granted to reproduce for educational use only. 36 © Goodheart-Willcox Co., Inc. Principles of Diagnosis Be sure you correctly interpret all information Correct root cause of failureroot cause of failure Check simple things first Make educated guess rather than uneducated guesseducated guess uneducated guess Remain calm

37 Permission granted to reproduce for educational use only. 37 © Goodheart-Willcox Co., Inc. Using Service Information Service informationService information is source of all: Vehicle specifications Diagnostic procedures Expected test results Repair procedures First determine which type of information is needed

38 Permission granted to reproduce for educational use only. 38 © Goodheart-Willcox Co., Inc. Using Service Information Service information is available as: Manufacturer and general information Troubleshooting charts Electrical, vacuum, and information flow schematics Be sure to use specific information for model and year of vehicle Protect service information from damage

39 Permission granted to reproduce for educational use only. 39 © Goodheart-Willcox Co., Inc. Troubleshooting Charts

40 Permission granted to reproduce for educational use only. 40 © Goodheart-Willcox Co., Inc. Schematics Traces path from beginning of wire, hose, or information trail to its end May show how information flows to and from ECM Make copies of needed pages and trace on copies, not original

41 Permission granted to reproduce for educational use only. 41 © Goodheart-Willcox Co., Inc. Diagnosing Electrical Problems Minor electrical defects can become major problems Having accurate wiring schematics is crucial First, photocopy schematic for system to be diagnosed

42 Permission granted to reproduce for educational use only. 42 © Goodheart-Willcox Co., Inc. Diagnosing Electrical Problems Begin at power source and physically trace wiring back to system ground connection As each connector, length of wire, and component is tested and checked, mark off component on photocopy You will eventually isolate the defective wire, connector, or component

43 Permission granted to reproduce for educational use only. 43 © Goodheart-Willcox Co., Inc. Diagnosing Charging and Starting Systems Observe operation as engine runs Charging system Check voltage and amperage output Check for voltage spikes Starting system Observe cranking speed and perform cranking amperage test

44 Permission granted to reproduce for educational use only. 44 © Goodheart-Willcox Co., Inc. Diagnosing Charging and Starting Systems If starting problem is caused by parasitic draw, begin checks at fuse block Pull fuses one at a time until circuit causing draw is isolated Copy schematics for affected circuits and trace each circuit until problem is isolated

45 Permission granted to reproduce for educational use only. 45 © Goodheart-Willcox Co., Inc. Diagnosing Engine Problems Check fuel, ignition, and compression systems first Unless there is good reason to look at another part of vehicle More than one part of single system may cause same symptom

46 Permission granted to reproduce for educational use only. 46 © Goodheart-Willcox Co., Inc. Diagnosing Engine Problems Check all possible causes of problem in basic engine systems before making repairs Dynamic compression test is common diagnostic method Cylinders are disabled individually

47 Permission granted to reproduce for educational use only. 47 © Goodheart-Willcox Co., Inc. Diagnosing Engine Problems After fuel, ignition, and compression systems are tested, check: Emissions system Cooling system Lubrication system Exhaust system

48 Permission granted to reproduce for educational use only. 48 © Goodheart-Willcox Co., Inc. Diagnosing Engine Problems Make visual inspection for disconnected hoses or wires If visual inspection does not reveal problem, check operation of entire system

49 Permission granted to reproduce for educational use only. 49 © Goodheart-Willcox Co., Inc. Diagnosing Engine Problems You may need to check cooling system for internal leaks or check engine oil pressure by installing pressure gauge If suspected system is controlled by ECM, check for related trouble codes

50 Permission granted to reproduce for educational use only. 50 © Goodheart-Willcox Co., Inc. Diagnosing Engine Problems Sometimes, problem can only be determined by partial disassembly Before considering major engine disassembly, all other possibilities should be reconsidered and eliminated

51 Permission granted to reproduce for educational use only. 51 © Goodheart-Willcox Co., Inc. Diagnosing Computer Control Systems Before beginning diagnosis on vehicles equipped with on-board computers: Obtain proper service information and other information for computer system Thoroughly check all non-computer systems Check ECM memory for trouble codes

52 Permission granted to reproduce for educational use only. 52 © Goodheart-Willcox Co., Inc. Diagnosing Computer Control Systems ECM monitors out-of-range readings from: Sensors Output devices ECM itself Readings are stored as trouble code

53 Permission granted to reproduce for educational use only. 53 © Goodheart-Willcox Co., Inc. Diagnosing Computer Control Systems If MIL is on or flashing, ECM contains trouble codes If MIL is not on, ECM may still contain stored codes Always perform code retrieval process before proceeding further Once codes are identified, make further tests as identified in service information

54 Permission granted to reproduce for educational use only. 54 © Goodheart-Willcox Co., Inc. Diagnosing Computer Control Systems Process of elimination isolates computer system parts that cannot be tested ECM Ignition module Start by testing all parts that can be tested If all testable parts check out okay, non- testable part is most likely cause

55 Permission granted to reproduce for educational use only. 55 © Goodheart-Willcox Co., Inc. Procedures for Computer System Diagnostics Driveability problems may be caused by defects not related to ECM or ECM- controlled system Always look for obvious problems first If no obvious defects are found, retrieve trouble codes from ECM memory

56 Permission granted to reproduce for educational use only. 56 © Goodheart-Willcox Co., Inc. Procedures for Computer System Diagnostics Find out what code indicates, and look for defects that could set that code If basic engine and drive train systems are operating correctly, computer control system may be at fault

57 Permission granted to reproduce for educational use only. 57 © Goodheart-Willcox Co., Inc. Procedures for Computer System Diagnostics Check all electrical connectors for tightness and cleanliness Check input sensors and related wiring first Most common cause of problems

58 Permission granted to reproduce for educational use only. 58 © Goodheart-Willcox Co., Inc. Procedures for Computer System Diagnostics Next, check: Output solenoids and other output devices Motors Ignition modules Injectors If input devices, output devices, and related wiring are okay, ECM is defective

59 Permission granted to reproduce for educational use only. 59 © Goodheart-Willcox Co., Inc. KOEO and KOER Test Procedures Tests performed with ignition on and either engine running or not running Key-on, engine-off (KOEO) tests Key-on, engine-running (KOER) tests Comparing KOEO and KOER readings often helps to pinpoint problem

60 Permission granted to reproduce for educational use only. 60 © Goodheart-Willcox Co., Inc. Diagnosing Drive Train Problems Drive train parts can affect driveability by incorrectly transmitting engine power Defective pressure switches can send improper signals to ECM Defective solenoids can fail to perform ECM output commands Other problems include noise, vibration, and harshness from worn parts

61 Permission granted to reproduce for educational use only. 61 © Goodheart-Willcox Co., Inc. Diagnosing Drive Train Problems Some defects can be spotted by raising vehicle on lift, such as: Worn U-joints or CV joints Oil on clutch facings Other problems will only show up when vehicle is driven

62 Permission granted to reproduce for educational use only. 62 © Goodheart-Willcox Co., Inc. Manual Clutch and Transmission/ Transaxle Diagnosis Manual clutch problems can cause slipping, vibration, and chatter Check clutch by slowly engaging it with: Engine running Vehicle stopped Transmission in first gear (Subaru)

63 Permission granted to reproduce for educational use only. 63 © Goodheart-Willcox Co., Inc. Automatic Transmissions and Transaxles After checking level and condition of transmission fluid, drive vehicle enough to shift through all speed ranges Check that shifts are smooth, without slippage, and occur at proper times and speeds

64 Permission granted to reproduce for educational use only. 64 © Goodheart-Willcox Co., Inc. Automatic Transmissions and Transaxles If used, try adjusting throttle linkage, then recheck shift pattern Check that torque converter clutch is applying when it should If problem cannot be corrected by adjustments, refer to service information for repair procedure

65 Permission granted to reproduce for educational use only. 65 © Goodheart-Willcox Co., Inc. Diagnosing Other Vehicle Systems Systems affecting driveability include: Brakes Front and rear suspensions Steering system Air conditioner Cruise control

66 Permission granted to reproduce for educational use only. 66 © Goodheart-Willcox Co., Inc. Diagnosing Other Vehicle Systems Check and inspect each systems components Look for obvious problems, including missing or loose drive belts Look for loose electrical connections on alternator and air conditioning

67 Permission granted to reproduce for educational use only. 67 © Goodheart-Willcox Co., Inc. Diagnosing Other Vehicle Systems Check air conditioning for: Proper refrigerant charge Problems that could make compressor cycle excessively or affect engine operation Refrigerant leaks at fittings

68 Permission granted to reproduce for educational use only. 68 © Goodheart-Willcox Co., Inc. Diagnosing Other Vehicle Systems When possible, drive vehicle to detect problems Road test may quickly located problems in suspension, brakes, and cruise control system If symptoms or codes occur in road test, but not in shop, defect may be in system operating when vehicle moves

69 Permission granted to reproduce for educational use only. 69 © Goodheart-Willcox Co., Inc. Diagnosing Problems Caused by Aftermarket Equipment Add-on equipment may cause problems due to: Improper installation Electromagnetic interference Poor connections to battery power and chassis ground are most frequent mistakes

70 Permission granted to reproduce for educational use only. 70 © Goodheart-Willcox Co., Inc. Diagnosing Problems Caused by Aftermarket Equipment Examine system for proper installation Tight connections Components installed in locations that do not interfere with other systems Wiring cleanly routed, tied together, and preferably installed in plastic looms

71 Permission granted to reproduce for educational use only. 71 © Goodheart-Willcox Co., Inc. Diagnosing Problems Caused by Fuel Gasoline-related driveability problems should be considered if vehicle has problems such as: Hard starting Hesitation Surging Rough idles before engine reaches normal operating temperature

72 Permission granted to reproduce for educational use only. 72 © Goodheart-Willcox Co., Inc. Diagnosing Problems Caused by Fuel If vehicles systems appear okay, suggest owner try another gasoline brand If owner uses premium in vehicle that does not require it, suggest lower grade Using wrong grade of diesel fuel in diesel engine may cause driveability problems in cold weather

73 Permission granted to reproduce for educational use only. 73 © Goodheart-Willcox Co., Inc. Deciding on Needed Work Process of interpreting results of all diagnostic tests Before condemning part based on test results, review its interaction with engine and vehicle systems Decide if part in question can cause particular test reading or symptom

74 Permission granted to reproduce for educational use only. 74 © Goodheart-Willcox Co., Inc. Deciding on Needed Work Troubleshooting charts and other diagnostic data can be great asset Good troubleshooting chart: Lists all possible causes of problem Allows parts to be checked in logical sequence

75 Permission granted to reproduce for educational use only. 75 © Goodheart-Willcox Co., Inc. Always Perform Additional Tests Additional testing is especially important when suspected part is solid-state, or otherwise untestable device Most are too expensive to randomly replace Making further checks to confirm problem is always good idea

76 Permission granted to reproduce for educational use only. 76 © Goodheart-Willcox Co., Inc. Deciding on Proper Repair Steps Amount and type of needed corrective actions must be determined Parts that interact with defective part may also need to be changed For example, replacing rotor when distributor cap is replaced

77 Permission granted to reproduce for educational use only. 77 © Goodheart-Willcox Co., Inc. Deciding on Proper Repair Steps Some parts, while theoretically serviceable, are almost always replaced Factors to consider when deciding to adjust, rebuilt, or replace part: Ease of adjustment Need for special tools Cost of replacement part Possibility that old part will fail again

78 Permission granted to reproduce for educational use only. 78 © Goodheart-Willcox Co., Inc. Making Adjustments If part is easily adjustable, adjust it before rebuilding or replacing Do not get too involved in trying to adjust stubborn problem If there is any doubt about whether adjustment has corrected problem, replace part

79 Permission granted to reproduce for educational use only. 79 © Goodheart-Willcox Co., Inc. Special Tools Used to adjust or disassemble complex assembly May be good investment if tools can be reused

80 Permission granted to reproduce for educational use only. 80 © Goodheart-Willcox Co., Inc. Rebuild or Replace? Weigh investment in materials and time against cost of new part Price of new or remanufactured part is often less than charge to rebuild old part Many repair shops and vehicle manufacturers recommend replacement of complete assemblies

81 Permission granted to reproduce for educational use only. 81 © Goodheart-Willcox Co., Inc. Contacting Owner about Needed Work After determining parts and labor necessary to correct problem, contact customer for authorization to perform repairs Never assume customer will want work done

82 Permission granted to reproduce for educational use only. 82 © Goodheart-Willcox Co., Inc. Contacting Owner about Needed Work Defective part or problem may be covered by warranty or guarantee Vehicle must be returned to approved service facility for repairs If vehicle is leased, leaseholder is actual owner and may have to approve repairs

83 Permission granted to reproduce for educational use only. 83 © Goodheart-Willcox Co., Inc. Contacting Owner about Needed Work Vehicle may be covered by extended warranty or service contract Forms of insurance Necessary to file claims for expenses In some cases, approval must be granted from insurer before repair work can begin

84 Permission granted to reproduce for educational use only. 84 © Goodheart-Willcox Co., Inc. Contacting Owner about Needed Work Before talking to anyone about vehicle, be prepared to supply this information: Exactly what needs to be done and why Careful breakdown of both part and labor costs Approximate time when vehicle will be ready

85 Permission granted to reproduce for educational use only. 85 © Goodheart-Willcox Co., Inc. Contacting Owner about Needed Work If it is suspected that problem will require further disassembly, make sure customer understands: Further diagnosis may be needed Costs may increase

86 Permission granted to reproduce for educational use only. 86 © Goodheart-Willcox Co., Inc. Follow-Up after Repairs Recheck vehicle to ensure problem has been corrected Check that vehicle operates properly and meets emission standards Always recheck vehicle, even if defect is minor Problem may have been easily fixed, but caused by another vehicle defect

87 Permission granted to reproduce for educational use only. 87 © Goodheart-Willcox Co., Inc. Follow-Up after Repairs After work is completed, inspect vehicle for tools Finally, check vehicle for oil, grease, and visible fingerprints

88 Permission granted to reproduce for educational use only. 88 © Goodheart-Willcox Co., Inc. Review What is troubleshooting? The process of diagnosing the cause of a given problem.

89 Permission granted to reproduce for educational use only. 89 © Goodheart-Willcox Co., Inc. Review What is a work order? A legal contract between the repair facility and the customer that describes the work to be done.

90 Permission granted to reproduce for educational use only. 90 © Goodheart-Willcox Co., Inc. Review When road testing a vehicle, _____. A. try to duplicate all normal driving conditions B. drive quickly from the service area to test acceleration C. ask the customer to wait at the shop D. None of the above. A. try to duplicate all normal driving conditions

91 Permission granted to reproduce for educational use only. 91 © Goodheart-Willcox Co., Inc. Review What is an educated guess? A reasonable decision based on testing and the process of elimination.

92 Permission granted to reproduce for educational use only. 92 © Goodheart-Willcox Co., Inc. Review Which three systems should be checked first when diagnosing an engine problem? The fuel, ignition, and compression systems should be checked first.

93 Permission granted to reproduce for educational use only. 93 © Goodheart-Willcox Co., Inc. Review True or False? If the MIL is not on, the ECM does not contain trouble codes. False

94 Permission granted to reproduce for educational use only. 94 © Goodheart-Willcox Co., Inc. Review Manual clutch problems can cause _____, _____, and _____. slipping, vibration, chatter

95 Permission granted to reproduce for educational use only. 95 © Goodheart-Willcox Co., Inc. Review What must be considered when deciding whether to rebuild or replace a part? The investment in materials and time must be weighed against the cost of a new part.

96 Permission granted to reproduce for educational use only. 96 © Goodheart-Willcox Co., Inc. Glossary Driveability worksheet Form that is filled out to simplify the drivability troubleshooting process. Has blanks for driver complaint, test results, repairs needed, and final results. Educated guess Drawing a conclusion based on study of the problem, test readings, and experience.

97 Permission granted to reproduce for educational use only. 97 © Goodheart-Willcox Co., Inc. Glossary Intermittent problems Problems that occur at irregular intervals with no set pattern. Road test Process of driving vehicle upon road for purpose of diagnosing problems and checking efficiency of repairs.

98 Permission granted to reproduce for educational use only. 98 © Goodheart-Willcox Co., Inc. Glossary Root cause of failure The basic, sometimes hidden, cause of a failure. Requires additional checking to ensure that the failure does not occur again. Schematic Graphic representation of an electrical, vacuum, or pressure circuit.

99 Permission granted to reproduce for educational use only. 99 © Goodheart-Willcox Co., Inc. Glossary Service information Specifications and instructions for diagnosing and servicing vehicles. May be in printed or electronic form. Much service information is now available on the Internet. Special tools Tool used for a single test or repair purpose. Usually cannot be used for any other purpose.

100 Permission granted to reproduce for educational use only. 100 © Goodheart-Willcox Co., Inc. Glossary Troubleshooting The process of determining the cause of a problem using logical diagnosis procedures. Troubleshooting chart Chart graphically listing complaints, causes, and possible corrections. A variation of the troubleshooting chart takes the technician through a series of steps to locate and fix a problem.

101 Permission granted to reproduce for educational use only. 101 © Goodheart-Willcox Co., Inc. Glossary Uneducated guess Jumping to the first possible cause that comes to mind, making this a dangerous way of diagnosing problems. Work order Form used to describe vehicle problems and to record diagnosis and repairs.


Download ppt "Permission granted to reproduce for educational use only. 2 © Goodheart-Willcox Co., Inc. Chapter 13 Troubleshooting Techniques."

Similar presentations


Ads by Google