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CHAPTER 7 POTENTIOMETERS PAGES 1 4

A position sensor would be the best description of what a potentiometer is. It is an input to a computer, not a direct control of a load on a circuit.

Topics covered

  • examples of common potentiometers
  • rheostats and other variable resistors
  • throttle position sensor (TPS) description and operation
  • what outputs are controlled based on the TPS input
  • accel enrichment and decel fuel cut-off
  • an "electronic accelerator pump"
  • how important is the TPS during steady throttle operation
  • throttle position sensor vs throttle position switch
  • how the TPS is used within the idle speed control system
  • IAC stepper motor review
  • symptoms of a faulty TPS
  • TPS/Potentiometer wiring
  • TPS sweep test (good and bad)
 

Chapter 7 Potentiometers pages 5-9, 13,14

Topics covered

  • TPS with more than 3 wires
  • function of throttle position switch
  • adjustable and self zeroing sensors
  • pull-up and pull-down switch input review
  • Electronic Throttle Control ETC
  • Accelerator Pedal Position APP
  • scan tool testing of a three wire potentiometer (TPS)
  • TPS sweep test comparing scope and scanner
  • what a TPS glitch looks like 27:50
 

CHAPTER 7 POTENTIOMETERS PAGES 10-15

A position sensor would be the best description of what a potentiometer is. It is an input to a computer, not a direct control of a load on a circuit.

Topics covered

  • circuit integrity vs. resistance testing
  • voltmeter/scope testing any three wire potentiometer
  • signal, 5v reference and sensor ground testing
  • sweep test difference between scope and scan data
  • electronic throttle control case study (scan data glitches) 9:50
  • EGR valve position sensor (EVP), operation and testing
  • how EGR flow is monitored
 

TPS EFFECT ON IDLE SPEED SELF ZEROING AND GLITCH CAPTURE CASE STUDIES EXPANDED CONTENT

Topics covered

  • TPS effect on idle speed control
  • pupose of a Dashpot
  • self zeroing TPS case study from chapter 20 pg. 6-8
  • temperature blend door potentiometer (diagram review)
  • potentiometer voltage range (what to look for without a spec)
  • how to get flash codes out of an OBDI Mitsubishi
  • TPS glitch testing
  • video case study reviews:
    1. Eclipse TPS glitch 27:40
    2. TPS sweep test - scope vs scan tool 45:28
 

TPS CIRCUIT AND INTEGRITY TESTING INCLUDING ETC SYSTEMS EXPANDED CONTENT

Topics covered

  • switch type TPS
  • electronic throttle body TPS glitches that are normal 10:38
  • what TPS 1 and TPS 2 should look like on an ETC system 15:24
  • closed throttle TPS% may not be zero on some cars but must be zero on others 18:13
  • TPS circuit designs (internal resistor)
  • wiring ID without a wiring diagram, sensor unplugged 26:45
  • effects of a voltmeter on unplugged signal bias
  • circuit integrity quick tests
 

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