auto diagnosis test #4 review

Auto Diagnosis Test #4 Review Your own handwritten notes may be used for the 1 st 10 minutes of the test

Based on Chapters 17 & 18 & 19 & Lab Demonstrations

For the Most Effective Personal Review, Look Over the OnLine Study Guide Multimedia

Battery Chapter 17 Info to Know 1. Battery Theory 2 dissimilar metals in acid 13. Cold Cranking Amp Rating 15. Reserve Capacity Rating

Battery Chapter 17 Info to Know 10. Open Circuit Battery Voltage 32. Baking Soda to Neutralize Battery Acid 15. Discharged Battery has Lower Specific Gravity

Battery Chapter 17 Info to Know 21. Electrolyte 36% H 2 SO 4 & 64% H 2 O 23. Lead Sulfate forming on plates = hard to charge 35. Specific Gravity

Water has a S.G. of 1.000 Electrolyte has a S.G. of 1.2601.28

43. Battery Load Test Procedures & Specs Drain ½ the CCA rating For 15 seconds Should not drop below 9.6 volts

Battery Chapter 17 Info to Know

Battery Chapter 17 Info to Know 46. Parasitic Load (what it is & how to test for this keyoff drain)

3. Electricity & Magnetism are Closely Related 4. Current flow Through a Coil Makes a Field 5. Flux Field

Starting System Ch 18 Info to Know

6. Soft Iron for Armatures 6. Hard Iron for Permanent Magnets 7. Reluctance is Resistance to Magnetic Fields 8. Air has High Reluctance (hard for fields) 8. Soft Iron has Low Reluctance (easy for fields)


10. Starter Parts – Field Windings & Armature 11. Permanent Magnet Starters 14. Armature in any motor spins 15. Brushes in a Starter are Copper – Low Ω



Explain This!

16. Repelling Magnetic Fields in Motors 18. Slower Crank = More Current Draw


19. Cranking System Circuits 19. Control & Motor Feed 20. Draw the System 20. Label the Circuits


Control Circuit is Low Amps

Motor Feed Circuit is High Amps

20. Draw the System 20. Label the Circuits


M

Battery +

High Amps Motor Feed Circuit

Low Amps Control Circuit

20. Draw the System 20. Label the Circuits


High Amps Motor Feed Circuit

Low Amps Control Circuit

Don’t Forget the Grounds!

22. Solenoid Plunger vs. Relay Contacts (explain) 26. Starter Drive & Gear Ratio with Flywheel 27. Neutral Safety Switch in the Control Circuit


26. Starter Drive & Gear Ratio with Flywheel 27. Neutral Safety Switch


Starter Drive Overrunning Clutch

Clutch Switch

P/N

28. Battery Load Test 1 st !! Not Parasitic 29. Rules for Battery Load Test


Drain ½ the CCA Rating For 15 Seconds Should not go below 9.6 Volts

31. You Can Voltage Drop Any Live Parts 32. ByPass Solenoids, Switches, Relays to Test


31. You Can Voltage Drop Any Live Parts 32. ByPass Solenoids, Switches, Relays to Test


Midtronics ® Test of Battery CCA Midtronics ® Test of Battery Cell Status Open Circuit Voltage of Battery Starter Current Draw – Inductively Relay Coil Resistance Bypass (jump) a Relay 30 to 87 Voltage at Battery During Cranking Volt Drop Positive Cable Volt Drop Negative Cable Voltage Available to Solenoid Voltage Drop of Plunger Contacts Voltage Drop of Relay Contacts Remotely Operate the Starter (jump)

34. Growler Test Results of an Armature 35. Starter Brushes Are Copper!!


Vibrating Strap indicates a shorted armature

Growler Test Indications

Starting System Ch 18 Info to Know Shorttohot armature metal strip vibrates

Open Armature no continuity to commutator bars

Shorttoground continuity to shaft

Sketch a Cranking System using schematic symbols

Cranking System Ch 18 Info to Know

1. Purpose of the Charging System 2. Use of electromagnetism & induction 4. Moving Magnetism through Coils

Rotor Field Coil & Stator Windings AC needs to be rectified to DC by diodes Copper Slip Rings & Carbon Brushes

Charging System Ch 19 Info to Know

8. Wyewound & Deltawound stators 12. Halfwave rectification 13. Fullwave rectification


16. Voltage Regulator in the Rotor Field Circuit 18. Zener Diode in the Voltage Regulator


Charging System Ch 19 Info to Know Unlike permanent Magnets, it is possible to control the strength of the Magnetic Field in an Electromagnet. The magnetic field is characterized by Magnetic Flux Density (B), which is related to the Permeability of the Medium (μ), the Number of Turns of the Coil (n) and the Current flowing through the Coil (I), Figure 1. For a given Electromagnet, μ and n are constant, we can change I to control its strength of Magnetic Field.

21. Typical Charging Rate is Battery + 2 volts 26. Carbon Pile Rheostat in the VAT40 27. Full Field Test

Puts Full Battery Voltage into the Rotor Field Coil to Check Maximum Output


27. Full Field Test Puts Full Battery Voltage into the Rotor Field Coil to Check Maximum Output


PCM can replace the Voltage Regulator

28. Diode Ripple is Diode Leakage – Short 30. Open Diode = No Charge


31. Schematic Symbols & Relay vs. Solenoid


Diode Testing with a DMM


Forward Biased Conducting with a .4 to .7 Voltage Drop

Reverse Biased Not Conducting

Reading OL on the DMM

Ohm’s Law Equations


V = A x O

A = V ÷ O

O = V ÷ A

Charging System Ch 19 Info to Know Basic Charging System Schematic

Schematic Symbols

Thermistor Diode Zener Diode

WyeWound Stator DeltaWound Stator

Capacitor

TemperatureSensitive Variable Resistor

Schematic Symbols

Switch

Relay Solenoid

Solenoid Pullin Winding

Release Spring

Schematic Symbols

NPN Transistor PNP Transistor

Diode Trio Rectifier Bridge

Parts to Know

Diode Trio Rectifier Bridge

Parts to Know

Solenoid Starter Drive

Parts to Know

Stator Rotor

Deltawound stator Wyewound stator

Starter Armature

Starter Drive

Starter Bushings

Alternator Bearings

Copper Starter Brushes

Starter Field Coils

Starter Solenoids

Alternator Rotors

Alternator Stators

Carbon Alternator Brushes

Alternator Diode Trio

Alternator Rectifier Bridge

Alternator Voltage Regulator

M

G

Motor

Generator

Relay Solenoid

Control Circuit that is Low Amps

Relays & Solenoids Both Have:

Load Circuit that is High Amps

Load can be motor, lights, etc.

auto diagnosis test #4 review

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