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Lesson 1 [4 Pages.]
ATOMIC STRUCTURE AND INTRODUCTION TO VEHICLE ELECTRICAL &
ELECTRONIC SYSTEMS
Introduction to differences between vehicle electrical systems
and electronic systems; introduction to the atom and elements;
what is electricity; electrons; nucleus, protons and neutrons;
The Law of Electrostatics; basic atoms; conductor and insulator
atoms; direction of current flow; when an electrical circuit
become an electronic circuit.
Lesson 2 [4 Pages.]
ELECTRICAL CHARGES
The First Law of Charges; nature of negative and positive charges;
potential difference; what happens when current flows; potential
difference between unlike charges and similar charges; battery
used to maintain charge, discharging a battery; Voltage; Units
of Volts; relationship between battery and alternator.
Lesson 3 [4 Pages.]
VOLTAGE & VOLTMETERS CURRENT & AMMETERS
Definition of voltage; direct relationship of voltage and current;
SLI battery voltage; Open Circuit Voltage measurement; Analog
and digital voltmeters; voltmeter DC accuracy; basic principle
of voltmeter operation; measuring open circuit voltage; DC current
from a battery; ammeters measure current.
Lesson 4 [4 Pages.]
RESISTANCE, PART 1
Definition of resistance, indirect relationship of current and
resistance; the unit of resistance; expressing resistance; resistance
in conductive material; resistance of wire; specific resistance;
relative resistance values; specific resistance of materials;
calculating resistance of wire; American Wire Gauge; specific
resistance of solid-state material; resistor notation and symbol;
fixed carbon resistors; how temperature affects resistance.
Review Test 1-4 (28 Questions)
Lesson 5 [4 Pages.]
RESISTANCE, PART 2
The purpose of resistors; The Carbon Composition Resistor; Connecting
resistors to circuit boards; definition of soldering; common
problem mounting resistors and the dog-bone resistor; the schematic
symbol of the resistor and resistance; evaluating resistors in
terms of ohm value, tolerance rating, temperature stability and
power rating; resistor size in terms of physical size, wire wound
resistors.
Lesson 6 [6 Pages.]
RESISTANCE, PART 3
Resistor color code, labeling resistors on the circuit board,
determine resistance from the color code, determine color code
from the resistance, multiplier factor, tolerance factor, calculating
tolerance values, practice exercise calculating tolerance, Meg
ohms, k ohms, resistor circuits, the series circuit, the parallel
circuit, the series-parallel compound circuit, cold circuit analysis,
practice exercise working with the resistor color code.
Lesson 7 [7 Pages.]
RESISTANCE PART 4 SERIES and PARALLEL RESISTOR CIRCUITS
[5 Pages. plus 1.5 pg. supplement]
Calculating resistance in series circuits, total resistance in
series, total resistance in parallel, three ways to calculate
total resistance in parallel, total resistance in compound circuits.
Lesson 8 [4 Pages.]
ANALOG AND DIGITAL OHMMETERS
Introduction to ohmmeters, how an ohmmeter works, the ohmmeter
scale, analog ohmmeter ranges, calibrating analog ohmmeters,
digital ohmmeters, differences in analog and digital ohmmeters,
ohmmeter test voltage polarity and amplitude, F.E.T. analog ohmmeter
characteristics.
Review Test 5-8 (33 Questions)
Lesson 9 [6 Pages.]
TROUBLESHOOTING WITH OHMMETERS
Selecting the type ohmmeter, measuring resistor circuits, small
battery symbol for a test battery, connecting the ohmmeter test
leads, tracing ohmmeter test current, indicating the resistance
value, reversing ohmmeter test leads, analyzing analog ohmmeter
readings, when resistance is lower than normal, definition of
a "short," definition of an "open" or high
resistance, using an ohmmeter to check continuity, checking resistance
in parallel circuits.
Lesson 10 [6 Pages.]
WORKING WITH RESISTANCE IN VEHICLE CIRCUITS
Working with resistance, incandescent lamp resistance, two factors
to know about lamps, incandescent lamp "cold" resistance,
incandescent lamp "hot" resistance, determining lamp
hot resistance, resistance from friction, switch contact resistance,
summarizing ohmmeters.
Lesson 11 [6 Pages.]
VEHICLE CIRCUIT PRINCIPLES
"The Voltage Side of the Circuit"
Building the basic circuit, Modes of vehicle voltage source operation.
Basic Vehicle Equivalent Circuit,. System voltage in the BVEC,
Current flow in the BVEC, Battery current, How current flows
inside the battery, Current flow with the alternator on-line,
BVEC circuit resistance, major points to remember.
Lesson 12 [6 Pages.]
"The Ground Side of the Circuit"
The BVEC without grounds, Ground, Ground in a vehicle, Ground
symbols on schematic diagrams, Negative ground systems, Ground
side resistance, Positive ground systems, Polarity of the load,
Ground circuit resistance, ground circuit voltage, Voltage above
and below ground, Pop Quiz, The proper way to measure circuit
voltage.
Review Test 9-12 (13
Questions)
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Lesson 13 [6 Pages.]
INTRODUCTION TO OHM'S LAW, THE METRIC SYSTEM & POWER MEASUREMENT
Introduction; Ohm's Law in basic form; Metric system of measurement;
Ohm's Law used throughout electronics; Ohm's Law defined; Ohm's
Law Pie; Metric Units of Voltage Measurement; practice with Ohm's
Law for voltage; a common mistake using Ohm's Law; Use Ohm's
Law to calculate current; Metric units of current measurement,
convert amps to milliamps or milliamps to amps; practice with
Ohm's Law for current; use Ohm's Law to calculate resistance;
practice with Ohm's law for resistance; Ohm's Law applies to
the total circuit; power in electrical circuits; metric units
of power measurement; practice with the power formula; answers
to practice exercises. [Supplement 13-1 Reference Chart..
Lesson 14 [6 Pages.]
SERIES CIRCUIT ANALYSIS
Using Ohm's Law; updating the BVEC; total circuit values; voltage
source variations; two basic configurations; current in a series
circuit; voltage in a series circuit; detrimental effects of
RVS and RGS; working with current and voltage in series; answers
to practice problems.
Lesson 15 [4 Pages.]
VOLTAGE DROP MEASUREMENTS
Introduction to voltage drops; what do you mean by a voltage
drop?; good and bad voltage drops; the math of voltage drops;
what makes voltage drops appear?; normal voltage drops; small
resistance makes big voltage drops; two limitations of ohmmeters.
Lesson 16 [6 Pages.]
APPLIED VOLTAGE DROPS
Typical voltage drop readings; voltage drops in wiring; voltage
drops in connections; voltage drops in battery cables; voltage
drops in battery posts; voltage drops in ground circuits; proper
grounding of a DMM; two primary vehicle ground Vds; Vd of voltage
and ground side of a circuit; voltage drops - alternator and
battery; voltage drops - battery & starter motor.
Review Test 13-16
(33 Questions)
Lesson 17 [6 Pages.]
VOLTAGE AND CURRENT IN PARALLEL CIRCUITS
Introduction to parallel circuits; The Parallel Circuit; Review
of the laws of series circuits; Introduction to Voltage and Current
In Parallel; The Law of Voltage in Parallel; Using the Law of
Voltage in Parallel; The Law of Current in Parallel; Using the
Law of Current in Parallel; Tracing Current in a Parallel Circuit;
Measuring Key-Off Drain; Kirchhoff's Laws; Applying Kirchhoff's
Current Law; Applying Kirchhoff's Voltage Law; Analyzing Circuit
Loops; RVS and RGS in Parallel Circuits; Jump Starting Creates
a Parallel Circuit.
Lesson 18 [6 Pages.]
COMPOUND CIRCUIT ANALYSIS & INTRO. TO TROUBLESHOOTING
Introduction; The Series Circuit; The Parallel Circuit; Cold
Circuit Analysis; Practice Exercises Using Figure 3; The Compound
Circuit; Practice Exercise Using Figure 4; Electronic Troubleshooting
By Definition; How To Begin Troubleshooting; Two Techniques of
Voltage Measurement; Techniques of Current Measurement; Techniques
of Resistance Measurements.
Lesson 19 [6 Pages.]
BATTERIES, PART 1 OF 2 "BATTERY PRINCIPLES"
Why test batteries?; what is VET battery trouble-shooting?; battery
construction; battery voltage; battery operation; specific gravity;
surface charge; specific gravity vs. OCV; adding water to batteries;
charging batteries; how to tell when battery is fully charged;
storing batteries on concrete; battery chemistry; two battery
specifications are important; when a VET installs a new battery;
misc. battery safety tips.
Lesson 20 [6 Pages.]
BATTERIES, PART 2 OF 2 "TESTING BATTERIES"
Overview of battery testing; test equipment for battery testing;
crank test the battery in the vehicle; BATTERY TEST FOR DISCHARGE;
determine remaining battery service life; BATTERY TEST FOR CHARGE;
common ways SLI batteries fail. Supplement 20-1 - Vehicle Battery
Standard Test Procedure for VETs.
Review Test 17-20 (39 Questions)
Lesson 21 [6 Pages.]
ALTERNATORS AND CHARGING SYSTEMS PART 1 OF 2
Introduction to Alternators; The Alternator or Charging System;
The Charging Voltage; The Charging Current; The Voltage Regulator;
Regulating the Charging Voltage; Rotor and Stator Windings; AC
Inside the Alternator; AC Changed to DC; Regulating Charging
Current.
Lesson 22 [6 Pages.]
ALTERNATORS - CHARGING SYSTEM TROUBLESHOOTING, PART 2 OF 2
The Diode Trio; The Electronic Feedback Principle; Alternator
Specifications; Vds in the Charging System; When VdVS and VdGS
are Slightly Too High; Alternator Noise; AM/FM Radio Detects
Alternator Noise; Battery Should Be Fully Charged When Installed;
Testing the Charging System; Charging System Characteristics;
Testing the Charging Voltage; Voltage Test for Undercharge; Voltage
Test for Undercharge; Testing the Charging Current; Final Item
About Charging Systems; New Horizons with Alternator.
Lesson 23 [6 Pages.]
LOAD CIRCUIT CONTROL
The Vehicle's Voltage Source; BVEC Series Lamp Circuit; Load
Control; The Texas-Two-Step; Switch-to-Voltage Control; Vc with
Switch-to-Voltage Control; Switch-to-Ground Control; Vc with
Switch-to-Ground Control; Dynamic Load Resistance; In-Rush Current,
Switch Control in Parallel Circuits; Fail-Safe; Practice Exercise.
Lesson 24 [6 Pages.]
BASIC CIRCUIT FAULT ANALYSIS
What Goes Wrong in a Circuit?; The Texas-Two-Step; Effect of
VdLOAD on the Circuit; Six Common Circuit Problems; Circuit Problem
#1; Definition of an Open Circuit; Circuit Problem #2; Definition
of a Vd; What Happens When the Load is Disconnected?; Circuit
Problem #3; Circuit Problem #4; Circuit Problem #5; Circuit Problem
#6.
Review Test 21-24
(24 Questions)
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Lesson 25 [4 Pages]
TROUBLESHOOTING SHORT CIRCUITS
Introduction to short circuits; What is a short?; BVEC Circuit;
Testing total resistance;; Evaluating CUT RT; Shorted Load; Low
resistance Load; Voltage side short to ground; Short to ground,
CUT OK; Sample Readings on vehicles.
Lesson 26 [4 Pages]
CAPACITORS, Part 1 of 2
Overview of electronic components; Introduction to capacitors;
Capacitors in DC versus AC circuits; Charging capacitors with
DC; Polarity of capacitor charge; Quantity of capacitor charge;
Size of capacitor plates affects charge; Characteristics of dielectric
materials.
Lesson 27 [6 Pages]
CAPACITORS PART 2 OF 2
The charged capacitor; Dielectric leakage; A capacitor holds
a charge; How a capacitor discharges, Capacitor action in a live
circuit; S1 closed, S2 closed; Capacitors react to increased
source voltage; Capacitors react to decreased source voltage;
Turning circuit OFF with capacitors; Capacitor values; Formula
for capacitance; Capacitors and time; RC time constants; Time
constants while charging; Time constants while charging; Types
of capacitors; Electrolytic capacitors; Capacitors mounted on
circuit
boards.
Lesson 28 [6 Pages]
INDUCTORS AND INDUCTANCE, PART 1
Review of an electrostatic field; What is an inductor; Inductors
compared to capacitors; Current through a wire; Use care with
an inductive current clamp; Properties of magnets; Dynamics of
a coil; Coil symbols; Inductor designations; Effect of Inductor
at circuit power-up; When a coil is not present; When coil is
present; Effect of inductor at max current; Effect of inductor
as source voltage varies; Effect of inductor at circuit power
down; Electronics circuits need surge protection; Inductance
measured in Henries.
REVIEW TEST 25-28
(18 Questions)
Lesson 29 [4 Pages]
INDUCTORS, PART 2
Inductors in circuits; Inductive characteristics; Inductance
and current; Inductance and resistance; Inductance and core material;
Inductance and number of turns; Troubleshooting Intermittent
Coils; Inductor Time Constants; Coil Discharging and Time Constants.
Lesson 30 [4 Pages]
INDUCTORS, PART 3
The good and the bad about inductors; energizing a coil; Battery
voltage decreases while cranking; De-energizing a coil; Surge
current path; How a coil dumps stored energy so fast; Protecting
solid-state computer circuits.
Lesson 31 [6 Pages]
CAPACITORS & INDUCTORS WORKING TOGETHER
Capacitors and inductors work together; Reviewing capacitors;
Reviewing inductors; Radio noise filtering; Radio noise filter
theory; Coil filters current variations; Capacitor filters voltage
variations; Ignition circuit; When the points are OPEN; When
the points are CLOSED; When the points are OPENED; What is a
transformer?; Firing the plug; Quieting switch pop.
Lesson 32 [4 Pages]
COIL CIRCUITS, PART 1 OF 2
Where we are up to now; When a coil is a load in a circuit; Coil
(Load) reaction to circuit current; Coil load resistance readings;
Reviewing ohmmeters; Measuring coil resistance; Measuring coil
circuit current; Measuring coil circuit voltages.
REVIEW TEST 29-32
(25 Questions)
Lesson 33 [6 Pages]
COIL CIRCUITS, PART 2 TROUBLESHOOTING SOLENOID CIRCUITS
Overview; Measuring coil circuit Vds; Controlling a coil as the
load; Switch-to-ground control; TTS readings with S-G-C; Try
the TTS on an A/C Clutch on a car; Six basic coil circuit failures;
Coil circuit failure #1; Troubleshooting coil problem #1; Coil
circuit failure #2; Troubleshooting coil problem #2; When load
is disconnected from circuit; Coil circuit failure #3; Troubleshooting
coil problem #3; Coil circuit failure #4; Troubleshooting failure
#4; When load is disconnected from circuit; Coil circuit failure
#5; Troubleshooting failure #5; Coil circuit failure #6; Troubleshooting
failure #6; Coils and ballast resistors.
Lesson 34 [6 Pages]
PRINCIPLES OF DC MOTORS
Lesson overview; DC motor component parts; Current in DC motor
operation; DC motor operational characteristics; What is CEMF?;
DC motor symbols; DC motor configurations; Starter motor circuit;
Interpreting starter motor circuits; Low voltage-yet normal current?
Lesson 35 [6 Pages]
TROUBLESHOOTING DC MOTOR CIRCUITS
Lesson overview;, When a DC motor is the load in a circuit; DC
motor reaction to circuit current; DC motor winding resistance;
Check DC motor for shorts to housing; Measuring DC motor load
current; Calculating DC motor resistance when ON; Measuring DC
motor circuit voltages; Measuring DC motor voltage drops; DC
motor ballast resistors; DC blower motor circuit; Troubleshooting
a blower motor problem.
Lesson 36 [6 Pages]
DC MOTOR CIRCUIT COMMON FAILURE MODES PART 1 OF 2
Lesson overview; Controlling a DC motor; Switch-to-voltage DC
motor Control; TTS readings with S-V-C; TTS readings with S-G-C;
Perform TTS on a DC blower motor circuit; DC motor circuit failures;
DC motor circuit failure #1; DC motor circuit failure #2; DC
motor circuit failure #3; DC motor circuit failure #4.
REVIEW TEST 33-36
(19 Questions)
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Lesson 37 [6 Pages]
DC MOTOR CIRCUIT COMMON FAILURE MODES PART 2 OF 2
DC motor circuit failure #5; DC motor circuit failure #6; DC
motor is shorted; Voltage side of circuit shorted to ground;
DC motor winding shorted to housing; DC motor controlling excessive
load; Benefits of DC motor load testing; When 2 problems exist
at the same time.
Lesson 38 [4 Pages]
RELAY CIRCUITS, PART 1 OF 4
Lesson introduction; The purpose of relays; Common relay terminal
description; A coil polarity problem; Relay spike suppression
resistor; Introduction to troubleshooting relays, BVEC relay
circuit.
Lesson 39 [6 Pages]
RELAY CIRCUITS, PART 2 OF 4
Lesson introduction; Relay DC circuit operation; Relay terminology;
CCA or relay's primary circuit; CCA of relay's secondary circuit;
A system for troubleshooting relays; Troubleshooting relay primary
circuit' troubleshooting relay secondary circuit; Relay coil
reaction to primary circuit; Importance of relay winding resistance;
Check coil resistance - digital ohmmeter; Reviewing analog ohmmeters;
Check coil resistance - analog ohmmeter.
Lesson 40 [4 Pages]
RELAY CIRCUITS, PART 3 OF 4
Checking diodes with diode test; Will diode test always check
a diode?; Relays with spike suppression resistors; measuring
relay coil current; measuring relay circuit voltage drops; Vds
of the primary circuit; Vds of the secondary circuit; Checking
relay contact Vd.
REVIEW TEST 37-40
(13 Questions)
Lesson 41 [6 Pages]
RELAY CIRCUITS, PART 4 OF 4
Finishing up relay circuits; Switch-to voltage relay control;
Switch-to-ground relay control; Relay circuit failures; Relay
circuit failure #1; Relay circuit failure #2; Relay circuit failure
#3; Relay circuit failure #4; Relay circuit failure #5; Relay
circuit failure #6; Troubleshooting a shorted load; relay winding
resistance readings.
Lesson 42 [6 Pages]
INTRODUCTION TO SEMICONDUCTOR PRINCIPLES, PART 1 OF 2
It's about time we got this far; Electric current in circuits;
What does a VET need to know; The history of solid state electronics;
It's time for atoms . . . again; Covalent bonding; Doping semiconductor
material, Adding impurities; Creating N type material, Creating
P type material; Holes in P type material.
Lesson 43 [6 Pages]
SEMICONDUCTOR PRINCIPLES, PART 2 OF 2
Lesson introduction; Electrons and Holes; Creating a PN junction
diode; Semiconductor diode terminology; Forward bias turns diode
ON; Diode schematic symbol forward bias; Leakage current in PN
junctions; Diode schematic symbol reversed biased; Introduction
to graphs; Diode forward and reverse bias graph; Lesson summary.
Lesson 44 [6 Pages]
TROUBLESHOOTING DIODES
Lesson introduction; Testing diodes; Setting Up analog ohmmeter;
Testing diodes with analog ohmmeter; Applying reverse bias turns
diode OFF; Applying forward bias turns diode ON; Ohmmeter power
testing diodes; Abnormal ohmmeter readings of diodes; Testing
diodes with DMM's diode test; A practical use of a diode; Diode
ratings; How diodes fail; Light emitting diodes; Lesson summary.
REVIEW TEST 41-44
(20 Questions)
Lesson 45 [6 Pages]
TRANSISTOR, PART 1, THE NPN TRANSISTOR
Lesson introduction; basic transistors; The NPN transistor; Forward
bias current in a NPN transistor; Collector current in a NPN
transistor; Voltage and current in a NPN transistor; NPN transistor
in a circuit; NPN transistor in a digital signal circuit; Testing
the NPN transistor circuit; Transistor static test - analog ohmmeter;
Transistor dynamic tests - digital voltmeter.
Lesson 46 [6 Pages]
TRANSISTORS, PART 2, THE PNP TRANSISTOR
The PNP transistor; PNP bias arrangement; Collector current in
a PNP transistor; Voltage and current in a PNP transistor; PNP
transistor in a circuit; PNP transistor in a digital signal circuit;
Phase shift in transistor circuits; Transistor amplification;
Transistor static test - analog ohmmeter; Transistor dynamic
tests - with DMM; PNP versus NPN.
Lesson 47 5 Pages]
SEMICONDUCTOR APPLICATIONS IN VEHICLE ELECTRONICS
Lesson introduction; Zener diodes; Zener diode in a voltage regulation
circuit; Why test a 5 volt reference circuit; How to test a 5
volt reference circuit; How a 5 volt reference circuit fails;
What to do? Introduction to the PCM schematic; 5 volt reference
voltage in a PCM.
Lesson 48 [6 Pages]
SPIKE VOLTAGE SUPPRESSION & INTRODUCTION TO LAB SCOPES
Lesson introduction; The spike suppression diode; spike suppression
diode review; spike suppression diodes and driver; Spike suppression
in injector circuits; Lab Scope Terminology; Basic injector wave
form; Analyzing basic injector wave form; Spike suppression diode
in relay circuits; Spike suppression resistors in relays.
REVIEW TEST 45-48
(15 Questions)
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Lesson 49 [6 Pages]
POLARITY SENSING DIODES & INTRO.. TO VEHICLE COMPUTERS
Polarity sensing diodes; The polarity sensing diode; Polarity
sensing diode in injector circuits; Polarity sensing diode in
relay circuits; Analyzing TTS readings with polarity sensing
diode; Schottky diode; Polarity sensing diode in computers; B+
supply to computers; The ground side of computers; Should a VET
repair computers?; The computer brain.
Lesson 50 [6 Pages]
DIGITAL ELECTRONICS, PART 1 OF 4
Lesson introduction; Analog vs. digital electronics; Analog voltage;
Measuring analog voltage; Using analog voltage to control a lamp;
Digital voltage; Using a digital signal to control a lamp; Measuring
digital signals; Digital logic probes (DLP); INTRO.. to DLPs;
DLP features; DLP switch settings; DLP voltage thresholds; basic
DC voltage checks with a DLP.
Lesson 51 [6 Pages]
DIGITAL ELECTRONICS, PART 2 OF 4
Lesson introduction; Numbering systems; What is a logic circuit?;
Logic formats and logic levels; The logic gate function; Logic
gate symbol and truth table; Actual circuit of a logic gate;
Troubleshooting a logic gate; Logic gate in a circuit; The NOT
function; The NOT gate logic symbol and truth table; Actual circuit
of a NOT gate; NOT gate in a circuit in a circuit; Troubleshooting
a NOT gate circuit; The AND function; AND gate circuit.
Lesson 52 [6 Pages]
DIGITAL ELECTRONICS, PART 3
Lesson introduction; The NAND gate function; NAND gate logic
symbol and truth table; Actual circuit of a NAND gate; Quad driver
NAND gate operation; Troubleshooting a quad driver circuit; Common
quad driver failures; Testing quad driver resistance; The OR
function; The OR gate symbol and truth table; Actual circuit
of an OR gate; OR gate in a circuit.
Review Test 49-52
(14 Questions)
Lesson 53 [6 Pages]
DIGITAL ELECTRONICS, PART 4 OF 4
Lesson introduction; INTRO.. to integrated circuits; Basic computer
block diagram; The CPU; ROM, RAM, PROM memory; Analog to digital
conversion; Input'output IC; Integrated circuit failures; Ground
straps prevent ESD, The thermal curve concept; Artificially applying
the thermal curve; Surface mount technology; Computer personality;
Examples of computer personality.
Lesson 54 [6 Pages]
VOLTAGE DIVIDER CIRCUITS & CRITICAL VOLTAGE MEASUREMENT
Lesson introduction; Two resistor "fixed" voltage divider;
Two resistor "dynamic" voltage divider; Three resistor
"fixed" voltage divider; Current problems with voltage
dividers; DMM loading problem with voltage dividers; Critical
voltage analysis; Applying Cv analysis; Fat chance; When Cv is
B+; When Cv is simply too high; When Cv is zero volt; When Cv
is simply too low; How much can Cv reading deviate? When Cv test
point reads zero volts; How to use Cv analysis.
Lesson 55 [6 Pages]
POSITION SENSOR CIRCUITS PART 1 OF 2
Introduction; The potentiometer principle; Potentiometer failures;
Throttle position sensors; Adding voltage to the TP sensor circuit;
Significance of analog sensor signal voltage; Troubleshooting
there TP sensor circuit; Analyzing incorrect TP signal voltage;
Sweeping a TP sensor; TP sensor diagnostic trouble codes.
Lesson 56 [6 Pages]
POSITION SENSORS, PART 2 OF 2
Completing the TP sensor circuit; TP sensor noise filter circuit;
Noise filter networks, The analog to digital converter; Labeling
logic condition in logic diagrams; Reading analog data from the
AD/C; Analog input circuit failures; TP signal drop-out problem;
Actual TP problems and solutions; Scan tools; Examples of scan
tool troubleshooting; Fuel level sensor; EGR feedback voltage;
summarizing the last two lessons.
REVIEW TEST 53-56
(21 Questions)
Lesson 57 [6 Pages]
SWITCH POSITION SENSING & INTRO.. TO TEMPERATURE SENSING
Switch position sensors; Input/output IC inside the PCM; Troubleshooting
switch-to-ground sensing; Troubleshooting 3rd gear switch; Switch
to voltage position sensing; Processing A/C switch input; Troubleshooting
switch-to-voltage sensing; Introduction to temperature measurement;
Temperature sensing methods; Thermister temperature sensors;
Principle of Thermister operation.
Lesson 58 [6 Pages]
ANALOG SENSOR TROUBLESHOOTING
Lesson introduction; Engine coolant sensor circuit; Basic ECT
circuit; ECT circuit for OBD-II, ECT strategy; DTC sensor graph;
Sample ECT sensor graph; ECT sensor DTC graph analysis; Troubleshooting
ECT circuit; Check ECT resistance or voltage/: Two NTC temperature
sensor applications; Overview of the SI system of measurement;
Basic pressure measurement terminology.
Lesson 59 [8 Pages]
PRESSURE SENSING AND OXYGEN SENSORS
Lesson introduction; Manifold absolute pressure sensor; MAP technology
yesterday and tomorrow; MAP operating strategy; Basic MAP sensor
circuit; MAP sensor DTC graph; MAP sensor circuit troubleshooting;
Introduction to oxygen sensors; Operating principle of oxygen
sensor; Zro2 sensor circuit in OBD-II; Zro2 sensor bias voltage;
How to measure O2 bias voltage; Zro2 sensor response and driveability;
Running lean but no lean DTC; Running rich but no rich DTC.
Lesson 60 "The Finale" [8
Pages]
TROUBLESHOOTING COMPUTER CONTROLLED ACTUATOR CIRCUITS
Welcome to Lesson 60; Switch to ground computer control basics;
Switch to ground controlled solenoid circuit; When switch to
ground reading is not normal; Resistance test a coil or solenoid;
Current test a coil; Check the spike suppression diode; Injector
drivers - pulsed coil operation; Coil control with pulse width
modulation; Examples of switch to ground pulse width modulated
control; Switch to voltage computer control basics; Switch to
voltage computer controlled solenoid circuit; When switch to
voltage Cv reading is not normal, Example of switch to voltage
pulse width modulated control; Problems controlling DC motors;
Load testing actuators; Computer control of relay circuits; Congratulations
on completing 60 lessons.
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