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CHAPTER 3 TRANSISTOR DRIVERS AND OUTPUT SOLENOIDS PAGES 1 7

Topics covered

  • warning on manually energizing an output
  • why do I teach methods the manufacturer doesn't
  • power and ground side switching
  • what it means for a circuit to be energized
  • circuit identification using a voltmeter
  • circuit identification on a wiring diagram
  • circuit identification when both wires go to the computer
  • voltage readings on energized and de-energized circuits
  • how to identify the control wire using a voltmeter and test light
  • normally open and normally closed solenoids
 
CIRCUIT ID USING A 1999 JEEP WIRING DIAGRAM PG 3 4 EXPANDED CONTENT

Topics covered

  • what every output needs to work
  • circuit identification using a diagram
  • actual wiring diagram review of identifying circuit design on many different outputs (ignition coil, relay, solenoid, light bulb)
  • how to read an Engine Performance wiring diagram (1999 Jeep)
 
CIRCUIT ID WITH VOLTMETER CASE STUDY IMAGES PG 5 6 EXPANDED CONTENT

Topics covered

  • using a voltmeter to determine circuit design
  • "on", "off", and "energized" terminology
  • solenoid circuit testing
  • difference between "Pull Up & Pull Down" vs "Power and Ground side switching"
  • using a test light to ID control wire of a power side switched circuit
  • how to energize a ground side switched solenoid with a test light
  • test light brightness vs resistance of the solenoid
 
CHAPTER 3 TRANSISTOR DRIVERS AND OUTPUT SOLENOIDS PAGES 8 12

Topics covered

  • solenoid functional testing
  • how to safely energize an output with a test light
  • typical current draw of an output solenoid
  • how to measure the current flow of your test light
  • LED vs Incandescent test lights
  • current flow of the control side of a relay
  • warning on using jumper wires and T-pins
  • how to test computer drivers and control circuit integrity
  • scan tool bi-directional controls
 
WHAT TEST LIGHT SHOULD BE USED TO ENERGIZE AN OUTPUT PG 9 EXPANDED CONTENT

What type of test light should be used when trying to energize an output solenoid or testing a computer driver.

Topics covered

  • LED vs incandescent test lights
  • how to test the amperage of your test light
  • what makes the test light dim or bright during this test
  • how to energize a relay with a test light
  • which test light is preferred for energizing relays and solenoids
  • why the LED test light is best for testing computer drivers
  • why the test light brightness matters
  • how to manually energize a solenoid with a test light
  • resistance of the solenoid vs resistance of the test light
 
SOLENOID CIRCUIT ID WITH A VOLTMETER NORMALLY OPEN SOLENOID TEST TESTING COMPUTER DRIVERS

In this video I cover operation and testing of normally open and normally closed solenoids as well as testing computer drivers, using a Chrysler vacuum controlled EGR solenoid and fuel pump relay circuit for a live example.

Topics covered

  • energizing an output manually with the wrong polarity can fry a computer driver
  • how to determine circuit design when both solenoid wires go to the computer
  • normally open and normally closed solenoids
  • live example on a Chrysler vacuum type EGR solenoid
  • switching the auto ranging feature off on your voltmeter
  • how to properly test your voltmeter before measuring a circuit
  • circuit ID with a voltmeter (live example)
  • is the solenoid energized or is there a problem
  • how to change the state of an energized solenoid
  • operation of an EGR backpressure transducer
  • how to test a computer driver using a test light
 
CHAPTER 3 TRANSISTOR DRIVERS AND OUTPUT SOLENOIDS PAGES 13 18

Topics covered

  • normal voltage readings on a ground side switched solenoid
  • function of an output state monitor
  • how to troubleshoot a ground side switched solenoid with control wire voltage fixed high
  • things to consider before replacing a computer for a suspected faulty transistor driver
  • how to check for connector to computer pin contact
  • intentional shut-down of a computer driver
  • how to troubleshoot a ground side switched solenoid with control wire voltage fixed low
 
CHAPTER 3 TRANSISTOR DRIVERS AND OUTPUT SOLENOIDS PAGES 19 27

Topics covered

  • high resistance in a feed circuit (loaded circuit voltage drop test)
  • pinpoint testing of a power side switched circuit
  • low voltage on the control wire - driver on
  • using a test light in place of a solenoid to test for "intentional shut-down" of a computer driver
  • normal circuit voltage with a non-functional solenoid
  • using an ammeter to confirm an open circuit
  • warning on using an ohmmeter
  • high voltage on the control wire - driver off
  • bias voltage on a power side switched circuit
  • loaded circuit ground test
 
CHAPTER 2 SWITCH INPUTS PAGES 1 7

Topics covered

  • variable control solenoids
  • understanding duty cycle, pulse width and frequency
  • when to monitor injector duty cycle instead of pulse width
  • how a digital voltmeter will display a pulsed signal
 
2005 Pontiac Vibe P0741 TCC Solenoid troubleshooting part 1

This is part 1 of a 2-part series on troubleshooting a faulty TCC circuit. In part 1 we discuss how important it is to understand bias voltage when troubleshooting circuit problems on any output solenoid. We also find out (the hard way) that scan data bi-directional controls can get you in trouble if you're not paying attention. Watch as we incorrectly call a bad engine computer for this problem. In part 2 we will be discussing where we went wrong in our interpretation of the fault code as well as the bi-directional TCC solenoid test.

 
 

2005 PONTIAC VIBE P0741 TCC SOLENOID TROUBLESHOOTING PART 2

In this part 2 of 2 video, we will be discussing the problems we encountered with the TCC solenoid bi-directional test. Where we went wrong with our interpretation of the trouble code and how to check a computer driver without using a bi-directional test.

 
 

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