Hesitation and idle problems from a bad TPS (OBD1 Eclipse)

In this video I’ll show how to retrieve trouble codes from an OBD-I vehicle, a 1991 Eagle Talon (which is a Mitsubishi Eclipse), and how to test a throttle position sensor with a graphing multimeter. The TPS testing shown will also work on all three-wire potentiometers, and can be applied to any vehicle. The code retrieval procedure shown is make/model specific, so consult your service information for your application. Engine Performance Diagnostics chapter 7 Symptoms - intermittent check engine light illumination - hesitation on acceleration - surging idle Fix - replace faulty throttle position sensor Tests shown - retrieving trouble codes manually from an OBD-I vehicle - using a graphing multimeter during trouble code retrieval - how to test a 3-wire potentiometer without a wiring diagram (all types) - performing a TPS ‘sweep test’ using a graphing multimeter - using heat and vibration to expose electrical faults Tools used - graphing multimeter Playlist - (Chapter 7) Potentiometer-position sensor tests TPS, EVP, APP, VAF etc https://www.youtube.com/playlist?list=PLAFYVCyenqcoHHRsegwvlLd0MYKazby99 Related videos - How to test TPS wiring with a scan tool (any car) https://youtu.be/VhyNp7IsfQM - How to test throttle position sensor wiring with a resistor (any car) https://youtu.be/oZiroWQRgEc - Throttle Position Sensor test (voltmeter and scope) https://youtu.be/8KfKfImoIXg - How to test a throttle position sensor (P0121, P0122) GM wiring integrity https://youtu.be/h17kYyFrExE For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available at www.scannerdanner.com as an eBook or paper book. Want even more diagnostic training? Whether you are a DIY trying to fix your own car, someone looking to become an auto technician, or a current auto technician that wants to get more into diagnostics, subscribe to ScannerDanner Premium right here on YouTube. There is a 14 day free trial. On ScannerDanner Premium I will bring you right into my classroom at Rosedale Technical College. You will find page for page lectures taken right from my book as well as exclusive classroom type case studies. What is so special about these classroom case studies? I pull live problem vehicles directly into my classroom and we troubleshoot them in real time, using and applying the theory and testing procedures we learn during the classroom lectures. There is no better on-line training of how to troubleshoot automotive electrical and electronics systems anywhere!

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How to test an Idle Air Control (IAC) valve - Nissan/Infinity
How to test a Nissan 6-wire stepper type IAC motor. Engine Performance Diagnostics Chapter 20 pages 15-20 Symptoms - stalling - start stall - high idle - check engine light (P0505 trouble code) Fix - replace faulty IAC valve Tests shown - how to test a 6 - wire stepper motor - how to verify control circuit integrity - how to test a computer driver - IAC motor voltage waveforms Tools used - test light (LED type is preferred for this test) - lab scope - scan tool - back-probing tools Playlist - (Chapter 20) Idle Speed Problems and Testing https://www.youtube.com/playlist?list=PLAFYVCyenqcrqC1WhVE1LTzQSn4mbMjdu Related videos - Idle speed control error fault codes (P0507) - vacuum leak https://youtu.be/PKJnW08-Z8c - Ford idle air control valve (IAC) test - stalling problems https://youtu.be/0r3nCwZsS3M - Ford Idle Air Control (IAC) valve test (how to adjust minimum idle speed) https://youtu.be/ayjhL9jpFH8 - Solenoid Type idle air control valve IAC test using a Picoscope - Ford https://youtu.be/WoFt3uzQd44 For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available at www.scannerdanner.com as an eBook or paper book. Want even more diagnostic training? Whether you are a DIY trying to fix your own car, someone looking to become an auto technician, or a current auto technician that wants to get more into diagnostics, subscribe to ScannerDanner Premium right here on YouTube. There is a 14 day free trial. On ScannerDanner Premium I will bring you right into my classroom at Rosedale Technical College. You will find page for page lectures taken right from my book as well as exclusive classroom type case studies. What is so special about these classroom case studies? I pull live problem vehicles directly into my classroom and we troubleshoot them in real time, using and applying the theory and testing procedures we learn during the classroom lectures. There is no better on-line training of how to troubleshoot automotive electrical and electronics systems anywhere!





How to test TPS wiring with a scan tool (any car)
To test a sensor circuit for an open or shorted wire, a manufacturer will have you use an ohmmeter. Ohm testing always involves isolating the circuit in test, meaning you must disconnect the computer and sensor for accurate measurements. This is a ridiculous method to confirm wiring integrity. (too time consuming) In this video I will show you how to test the integrity of a TPS signal wire with just a scan tool and a paper clip. These procedures can be followed for any other potentiometer or pressure sensor circuit on any car. As an added safety, to protect the 5v reference circuit from a shorted sensor signal wire, use a 1k to 5k ohm resistor instead of a paper clip. Tools: - scan tool - digital multimeter - jumper wire Related videos: - How to test throttle position sensor wiring https://youtu.be/oZiroWQRgEc - Power Steering Pressure Sensor Test (P0550) https://youtu.be/WLLxcfC-zeQ - How to troubleshoot an EVAP Pressure Sensor (P0452) https://youtu.be/CkgrMasd57s - Ford 4-wire MAF sensor wiring tests (integrity testing) https://youtu.be/ejh_ZCntFkE - How to test a throttle position sensor (P0121) - wiring integrity https://youtu.be/h17kYyFrExE For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available at www.scannerdanner.com as an eBook or paper book. Want even more diagnostic training? Whether you are a DIY trying to fix your own car, someone looking to become an auto technician, or a current auto technician that wants to get more into diagnostics, subscribe to ScannerDanner Premium right here on YouTube. There is a 14 day free trial. On ScannerDanner Premium I will bring you right into my classroom at Rosedale Technical College. You will find page for page lectures taken right from my book as well as exclusive classroom type case studies. What is so special about these classroom case studies? I pull live problem vehicles directly into my classroom and we troubleshoot them in real time, using and applying the theory and testing procedures we learn during the classroom lectures. There is no better on-line training of how to troubleshoot automotive electrical and electronics systems anywhere! Playlist: - (Chapter 7) Potentiometer-position sensor tests TPS, EVP, APP, VAF etc https://www.youtube.com/playlist?list=PLAFYVCyenqcoHHRsegwvlLd0MYKazby99




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