34S14T0 basic electrical diagnosis 2006

Which digital multi-meter DMM setting is used to measure voltage?. Which digital multi-meter DMM setting is used to measure resistance.. What digital multi-meter setting is used to measu

Student Guide

ORDER NUMBER: FCS-13449-REF

COURSE CODE: 34S14TO

March, 2006

34-Electrical Systems

Appropriate service methods and proper repair procedures are essential for the safe, reliable operation of all motor vehicles,

as well as the personal safety of the individual doing the work This manual provides general directions for accomplishing service and repair work with tested, effective techniques Following them will help assure reliability.

There are numerous variations in procedures, techniques, tools and parts for servicing vehicles, as well as in the skill of the individual doing the work This manual cannot possibly anticipate all such variations and provide advice or cautions as to each Accordingly, anyone who departs from instructions provided in this manual must first establish that he compromises neither his personal safety nor the vehicle integrity by his choice of methods, tools or parts.

As you read through the procedures, you will come across NOTES, CAUTIONS, and WARNINGS Each one is there for a specific purpose NOTES give you added information that will help you to complete a particular procedure CAUTIONS are given to prevent you from making an error that could damage the vehicle WARNINGS remind you to be especially careful

in those areas where carelessness can cause personal injury The following list contains some general WARNINGS that you should follow when you work on a vehicle.

• Always wear safety glasses for eye protection.

• Use safety stands whenever a procedure requires you to

be under the vehicle.

• Be sure that the ignition switch is always in the OFF

position, unless otherwise required by the procedure.

• Set the parking brake when working on the vehicle If you

have an automatic transmission, set it in PARK unless

instructed otherwise for a specific service operation If

you have a manual transmission it should be in

RE-VERSE (engine OFF) or NEUTRAL (engine ON) unless

instructed otherwise for a specific service operation.

• Operate the engine only in a well-ventilated area to avoid

the danger of carbon monoxide.

• Keep yourself and your clothing away from moving parts

when the engine is running, especially the fan and belts.

• To prevent serious burns, avoid contact with hot metal parts such as the radiator, exhaust manifold, tail pipe, catalytic converter and muffler.

• Do not smoke while working on the vehicle.

• To avoid injury, always remove rings, watches, loose hanging jewelry, and loose clothing before beginning to work on a vehicle Tie long hair securely behind your head.

• Keep hands and other objects clear of the radiator fan blades Electric cooling fans can start to operate at any time by an increase in underhood temperatures, even though the ignition is in the OFF position Therefore, care should be taken to ensure that the electric cooling fan is completely disconnected when working under the hood.

The recommendations and suggestions contained in this manual are made to assist the dealer in improving his dealership parts and/or service department operations These recommendations and suggestions do not supersede or override the provisions of the Warranty and Policy Manual, and in any cases where there may be a conflict, the provisions of the Warranty and Policy Manual shall govern.

The descriptions, testing procedures, and specifications in this handbook were in effect at the time the handbook was approved for printing Ford Motor Company reserves the right to discontinue models at any time, or change specifications, design, or testing procedures without notice and without incurring obligation Any reference to brand names in this manual

is intended merely as an example of the types of tools, lubricants, materials, etc recommended for use Equivalents, if available, may be used The right is reserved to make changes at any time without notice.

WARNING: Many brake linings contain asbestos fibers When working on brake components, avoid breathing the dust Breathing

the asbestos dust can cause asbestosis and cancer.

Breathing asbestos dust is harmful to your health.

Dust and dirt present on car wheel brake and clutch assemblies may contain asbestos fibers that are hazardous to your health when made airborne by cleaning with compressed air or by dry brushing.

Wheel brake assemblies and clutch facings should be cleaned using a vacuum cleaner recommended for use with asbestos fibers Dust and dirt should be disposed of in a manner that prevents dust exposure, such as sealed bags The bag must be labeled per OSHA instructions and the trash hauler notified as to the contents of the bag.

If a vacuum bag suitable for asbestos is not available, cleaning should be done wet If dust generation is still possible, technicians should wear government approved toxic dust purifying respirators.

5. Provide me with a clear and thoroughexplanation of the service performed.

6. Call me within a reasonable amount of timeafter my service visit to ensure that I'mcompletly satisfied

7. Be responsive to questions or concerns Ibring to your attention

1. Make it convenient to have my vehicle

serviced at your dealership

2. The Service Advisor should demonstrate

a genuine concern for my service needs

3. Fix it right the first time

4. Complete servicing my vehicle in a timely

and professional manner

Expectation 3

“Fix It Right The First Time, On Time.”

Both service advisors and technicians are important players when it comes to Expectation

It is our goal to help the technician acquire all of the skills and knowledge necessary to “Fix

It Right The First Time, On Time.” We refer to this as “competency.”

Technician’s Role

Acquire the skills and knowledge for competency in your specialty via:

– Web Based Training – Web Based Training

– Instructor Led – Instructor Led

COURSE INTRODUCTION COURSE INTRODUCTION–1

General Course Information Introduction–2Course Requirements Introduction–2Course Objectives Introduction–2Agenda Introduction–2

LESSON ONE 1–1

Prerequisite Review 1–1Activity 1 1–7Activity 2 1–12Activity 3 1–15Activity 4 1–23Progress Review 1–29Activity 5 1–33Activity 6 1–37Activity 7 1–39Progress Review 1–45Activity 8 1–49Homework 1–51

LESSON TWO 2–1

Workstation 1 2–1Workstation 2 2–11Workstation 3 2–25Workstation 4 2–39Homework 2–45

LESSON THREE 3–1

Instructor-led Demonstration 3–1Workstation 1 3–5Workstation 2 3–11Workstation 3 3–19Workstation 4 3–31 Homework 3–43

LESSON FOUR 4–1

Instructor-led Demonstration 4–1Workstation 1 4–3Workstation 2 4–7

LESSON FIVE 5–1

Workstation 1 5–1 Workstation 2 5–5 Workstation 3 5–9 Workstation 4 5–13

Rotunda Order Form

COURSE INTRODUCTION

GENERAL COURSE INFORMATION

Course Description

This is the first instructor-led course in the Electrical/Electronics Curriculum This course is designed to provide hands-on opportunities for technicians to learn and improve their skills using tools and equipment, and to apply knowledge learned in previous curriculum courses in actual diagnostic situations Each day, students will have at least four opportunities to practice selected tasks Before the end of the course, they will have had at least 16 opportunities to practice diagnostic and service skills The results of the students’ work are recorded on worksheets.

Upon successful completion of this course, the students will be able to:

z Use the SSCC (Symptom-to-System-to-Component-to-Cause) diagnostic process relating to electrical concerns.

z Use special tools and service equipment associated with electrical diagnosis and repair.

z Use all service publications in their available formats to obtain needed information for diagnosis.

z Perform diagnostic test procedures.

Agenda

DAY ONE: Introductions, Prerequisite Review, Lesson 1 Workstations

PREREQUISITE

REVIEW

2 Give three examples of good conductive materials and three examples of good insulating materials:

1 Identify the 6 elements of a circuit:

3 Describe/Define Voltage:

4 Which digital multi-meter (DMM) setting is used to measure voltage?

5 In the illustration that follows, draw a complete circuit using the elements in question one Drawmeter leads to represent measuring available voltage to the bulb

BED107-A/VF

9 Describe/Define resistance:

10 Which digital multi-meter (DMM) setting is used to measure resistance?

11 In the illustration that follows, draw a complete circuit using the elements from question one Drawmeter leads to represent measuring resistance of the bulb

L4 L3 L2 L1

12V

L4 L3 L2 L1

12V

12 Draw series and parallel circuits in the diagrams below:

13 The sentences below describe parts of Kirchoff’s laws Complete the sentences

b The highest in a series circuit uses the most voltage

a In a series circuit, all of the is used by the load(s) in the circuit

ACTIVITY 1

DIRECTIONS: In this activity you will learn about resistance using a digital multi-meter (DMM) and a

resistor board

1 What is resistance?

2 What unit of measure is used to measure resistance?

3 What must be done to the circuit to prepare for testing resistance?

4 What digital multi-meter setting is used to measure resistance?

5 Where should the black meter lead be connected to the meter?

6 Where should the red meter lead be connected to the meter?

ACTIVITY 1 RESISTANCE MEASUREMENT

Units of Measure

To diagnose and repair electrical problems, you must be able to accurately read and convert commonunits of measurement Automotive electrical work uses metric system prefixes for common measures.The most common prefixes are:

M= Mega: a number times one million (for example, 1MΩ = 1 million ohms)

k = Kilo: a number times one thousand (for example, 1kΩ = 1 thousand ohms)

m = Milli: a number divided by one thousand (for example, 1mA = 001 amps)

Each of these metric prefixes multiplies or divides a whole number by either one thousand or one

million Fortunately, you do not actually have to do multiplication or division when you convert fromone unit to another You simply have to move the decimal point the proper number of places in thecorrect direction

To help visualize this, think of the metric system in terms of a number line, as shown To convert fromone unit to the next, simply count the number of places you must travel along the number line

BED170-A/VF

Volts (V) Amps (A) Ohms ( )

Kilo (k)

Mega (M)

Milli (m)

To begin using the number line, first look at the units of the number you are working with to find your

starting point For example, if you had 50 mA, your starting point would be at Milli (m) on the number

line Then you would count the number of places between your starting point and the unit you want toconvert to For example, to convert 50 mA to amps, you would count three places to the left to reach

Amps (A) This means that you would move your decimal point three places to the left So 50 mA =

.050 A

What if you had 70kΩ? How many ohms would you have? From your starting point, which would be

Kilo (k), you would move across the number line three places to the right to Ohms (Ω) The decimal

would also move three places to the right So 70kΩ = 70,000 Ω

BED171-A/VF

Volts (V) Amps (A) Ohms ( )

Kilo (k)

Mega (M)

Milli (m)

0 5 0. mA 050 A

Volts (V) Amps (A) Ohms ( )

Kilo (k)

Mega (M)

Milli (m)

7 Set up the digital multi-meter (DMM) to measure resistance Measure the resistance of each resistor

on the board and complete the table below:

t n e m e r u s a e M

n a h T r e t a e r G t n e m e r u s a e M e h t s

I

? s m h O 0 0 0 , 0

1

) o n r o s e y e l c r i c (

NOTES

ACTIVITY 2

DIRECTIONS: In this activity you will use a digital multi-meter (DMM) to learn about resistance in a

series circuit Use the digital multi-meter (DMM), lamp board and jumper wires to answer the

following questions by filling in the blanks

1 Measure the resistance of lamps L1, L2, and L3, add the resistances together and enter your readingsbelow:

ACTIVITY 3

DIRECTIONS: In this activity you will use a digital multi-meter (DMM) to learn about voltage drop in

a series circuit

1 What is voltage?

2 What unit of measure is used to measure voltage?

3 What must be done to the circuit to prepare for testing voltage?

4 What digital multi-meter (DMM) setting should be used to measure voltage?

5 Where should the black meter lead be connected to the meter?

6 Where should the red meter lead be connected to the meter?

ACTIVITY 3 SERIES CIRCUIT: VOLTAGE DROP

L2 L3 L4

L1 12V

BED105-A/VF

Set up the power supply as follows:

• Turn on the power supply

• Adjust the Amps setting to maximum

• Setup the digital multi-meter (DMM) to measure DC volts

• Connect the digital multi-meter (DMM) leads to the positive and negative terminals at the rear of thepower supply

• Adjust the volts knob on the power supply until the digital multi-meter (DMM) reads approximately

12 volts

7 Connect positive and negative jumper wires from the power supply to lamp L1 Measure the voltagedrop across the load as shown and record your reading:

L1

8 Measure the voltage drop across one of the jumper wires as shown and record your reading:

BED110-A/VF

9 Connect lamp L2 in series with L1 as shown and measure the voltage drop across L1, then L2, andthen add the values:

Total

10 Is your total in question #9 within 0.2 volts of the source voltage?

(circle one) Yes No

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11 Connect L3 in series with L1 and L2 as shown and measure the voltage drop for each of the lamps,L1, L2, L3, then add the values:

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13 Use Kirchhoff’s Law to explain the previous results:

Do not disconnect the lamp board Let the Instructor know you have completed the activity.

NOTES

ACTIVITY 4

DIRECTIONS: In this activity you will use a digital multi-meter (DMM) to learn about current in a

series circuit

1 What is current?

2 What unit of measure is used to measure current?

3 What digital multi-meter (DMM) setting should be used to measure current?

4 Where should the black meter lead be connected to the meter?

5 Where should the red meter lead be connected to the meter?

6 How should the meter leads be placed in the circuit to measure current?

ACTIVITY 4 SERIES CIRCUIT: CURRENT

7 Set up the digital multi-meter (DMM) to measure current through L1 as shown and record yourreading.

NOTE: Before turning on the power supply ask the instructor to review your connections

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8 Add lamps L2 and L3 to the circuit in series as shown and measure current through all lamps.

10 Connect the circuit and the digital multi-meter (DMM) as shown and measure the current.

12 Current flow measured anywhere in a series circuit is _

throughout the circuit

NOTES

PROGRESS

REVIEW

DIRECTIONS: Answer questions 1 through 4 with your instructor After completing these questions

together, complete the remaining questions on your own

1 The sum of the individual voltage drops in a series circuit is equal to:

2 In a series circuit, the resistance drops the most voltage

3 Total resistance in a series circuit is equal to the sum of:

4 Amperage, when measured in a series circuit, is:

7 What happens to resistance when more loads are added to a series circuit?

8 How should you connect the digital multi-meter to the circuit to measure current flow in a seriescircuit?

DIRECTIONS: Complete the following questions on your own.

5 In a series circuit, total circuit resistance is equal to:

6 The total of all voltage drops in a series circuit are equal to:

PROGRESS REVIEW ACTIVITIES 1 - 4

9 Current flow in a series circuit is the same no matter where you measure it.

A True

B False

10 According to Kirchoff’s law, the sum of the individual voltage drops in a series circuit equals thevoltage of the:

12 According to Ohm’s Law, as resistance increases, what happens to current flow?

13 How does heat affect resistance?

11 According to Kirchoff’s law, with loads of different resistances, which load will drop the mostvoltage?

14 How are Watts determined?

NOTES