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CHAPTER 2 SWITCH INPUTS PAGES 1 7

Topics covered

  • switch input vs conventional switch
  • electronic and mechanical switches
  • pull-up and pull-down circuit designs
  • analog vs digital signals
  • intro to the 5v regulator
  • voltage sensing circuits
  • inputs vs outputs
  • signal wires vs control wires
  • switch input identification
 
CHAPTER 2 SWITCH INPUTS PAGES 7 23

Topics covered

  • data parameter changes
  • pull-down testing (signal fixed high and low)
  • effects of an open, short to ground, faulty switch or computer
  • what else should be tested before replacing a computer
  • review of using an ohmmeter for a short to ground test
  • performing a switch input bypass test
 
CHAPTER 2 SWITCH INPUTS PAGES 16 23

Topics covered

  • pull-up switch input circuit testing
  • why there are additional concerns when testing a pull-up design switch input circuit
  • why pull-down design circuits are easier to test
  • why a short to ground may not blow a fuse on a pull-up circuit
  • switch input bypass testing
  • review of testing for a short to ground with an ohmmeter
 
CHAPTER 2 SWITCH INPUTS PAGES 24 30

Topics covered

  • how to identify an electronic switch input using a voltmeter
  • why identification cannot be done using a wiring diagram
  • hall effect camshaft and crankshaft sensor circuit designs (pull-up and pull-down examples)
  • module to module communication (GM bypass ignition example)
  • frequency generating devices
  • basic operation of a hall effect sensor
  • how to perform a bypass test on an electronic switch input
  • wiring quick tests on a crank sensor and MAF sensor
  • early GM bypass ignition system Reference circuit troubleshooting
  • MAF sensor trouble code from a bad engine computer (GM)
 
COMPUTER VS NON COMPUTER POWER DOOR LOCKS READING WIRING DIAGRAMS PG 3 8 EXPANDED CONTENT

Topics covered

  • types of switch inputs
  • comparison of computer and non-computer controlled door lock circuits (Chevy Silverado)
  • how to read and trace out a wiring diagram
  • operation of a relay
  • Mitchell1 DIY
  • identifying switch input circuit design on a diagram
  • reverse polarity circuits
  • series circuit voltage drops and Kirchoff's law
  • switch input testing methods
  • circuit faults
 
VW ELECTRIC COOLING FAN SILVERADO DOOR LOCK CIRCUIT PG 3 8 EXPANDED CONTENT

Topics covered

  • 2001 VW GTI cooling fan wiring diagram review
  • switch input identification on a wiring diagram
  • voltage sensing circuits
  • how to perform a switch input bypass test
  • why we cannot rely on a test light for a short to ground test in all circumstances
  • module to module communication
 
SCAN DATA PID CHANGES AND BI DIRECTIONAL CONTROLS PG 7 EXPANDED CONTENT

In this video I will show you how to confirm switch input operation using a scan tool and also introduce bi-directional controls. The vehicle being used for testing is my 2009 Chevy Silverado 2500 HD.

Topics covered

  • how to monitor door lock and unlock inputs using scan data
  • how to turn output circuits on and off with a scan tool
 
 
SWITCH INPUT BYPASS TEST SILVERADO DOOR LOCK CIRCUIT PG 8 EXPANDED CONTENT

Topics covered

  • Switch Input circuit design ID with voltmeter
  • Loaded ground volt drop test
  • Switch Input bypass with incandescent test light
 
SWITCH INPUT IDENTIFICATION DOOR LOCK VIDEO REVIEWS PG 5 9 17 EXPANDED CONTENT

Topics covered

  • Silverado and Subaru door lock videos classroom review
  • how to ID circuit design with multiple wires on a component
  • ground to ground voltage drop test
  • switch input bypass test
  • pull down design testing
 
BYPASS TESTING LED VS INCANDESCENT LIGHT CASE STUDY REVIEWS PG 10 23 EXPANDED CONTENT

In this lecture I will show you why we cannot use an LED test light for bypass testing as well as break down three different case studies on switch inputs. Chevy Silverado door locks, Infinity with a bad crank sensor, and an igniter bypass test on a Lexus.

Topics covered

  • how much current does a test light draw
  • why an LED light can get you in trouble
  • electronic switch input circuit identification
  • switch input circuit identification variables
  • why we shouldn't use an LED test light to perform bypass testing
  • should the test light be lit when doing a bypass test
  • bypass testing variables
 
SWITCH INPUT IDENTIFICATION VARIABLES ELECTRONIC SWITCH INPUT ID PG 5 8 24 EXPANDED CONTENT

Today we start with a very important variable when it comes to identifying switch inputs. Then we move into how to identify electronic type switch inputs (hall effect sensors in particular).

Topics covered

  • how a splice on the signal wire of a switch input can change everything
  • "modified" pull-up design switch input
  • using a diagram to verify circuit design
  • methods to ID electronic switch input circuit designs
  • signal circuit integrity testing
 
ELECTRONIC SWITCH INPUTS CIRCUIT ID AND TESTING PG 24 27 EXPANDED CONTENT

Topics covered

  • operation of a magneto-resistive speed sensor
  • bypass testing a digital wheel speed sensor
  • operation of a hall effect
  • transistor theory
  • 5v pull down crank sensor testing
  • signal circuit troubleshooting review
 
1999 JEEP GRAND CHEROKEE NO START CLASSROOM CASE STUDY PART 1 THE DIAGRAM

This is a two-part series on a 1999 Jeep Grand Cherokee that is a no start. In this first part we will be dissecting the wiring diagram in preparation of testing the cam and crank sensors.
What we didn't film was our preliminary tests (before we brought the Jeep into the classroom), where we discovered a missing the 5v reference to the crank sensor.

Topics covered

  • using Mitchel engine performance diagrams
  • signal circuit ID with a wire diagram
  • what concerns do we have when a sensor signal is shared between two different modules
  • how to handle a missing 5v reference
  • what sensor wiring can be shared with other sensors
  • how to distinguish the ground circuit from the 5v reference circuit
 
1999 JEEP GRAND CHEROKEE NO START CLASSROOM CASE STUDY PART 2

In this part 2 of 2 video we will be testing the cam and crank sensor circuits on this Jeep. There was no better way to finish up our chapter 2 material than to have a live example of using our newly learned testing methods.

Topics covered

  • setting up a scope for multiple channels
  • proper time base settings on a scope
  • using the Snap-on waveform buffer
  • why we need detail and repetition on a scope capture
  • looking and cam, crank and rpm data PIDs during cranking
  • pin sequencing
  • measuring input signals at the PCM
  • why to bypass test at the component, not the pcm
  • incandescent test light vs LED test light pull down testing
 
CIRCUIT IDENTIFICATION MODULE TO MODULE COMMUNICATION PG 27 28 EXPANDED CONTENT

In this lecture, I cover the difficulties of identifying electronic type switch input circuit designs, in particular when it comes to module to module communication.

Topics covered

  • Ford PIP signal circuit design
  • performing a bypass test on a Ford TFI ignition system
  • circuit design of a Toyota/Lexus igniter (ignition module)
  • review of "How to test an igniter on a Toyota/Lexus" video
  • IGT and IGF circuits
  • how to trigger an igniter using a test light
  • how to determine ECM to Igniter circuit design
 
SWITCH INPUT IDENTIFICATION AND BYPASS TESTING LIVE EXAMPLE GMC ACADIA

In this video I am working on a GMC Acadia rear wiper circuit. It is a computer controlled wiper system with electronic switch inputs for the wiper and washer circuit. I will be using the video as a nice review of my chapter 2 material.

Topics covered

  • how to locate a switch input signal wire without a diagram
  • how to determine if it is a pull-up or pull-down design circuit
  • how to to a switch input bypass test
  • why you should not use an LED type test light for bypass testing
  • Incandescent vs LED test lights
  • at what threshold does a switch input signal trigger a module
  • should my test light be lit during a bypass test?
 

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