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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2012 VW Jetta No Communication with TCM U0101 (part 1)
Vehicle is stuck in park, check engine light is on and there is no communication with the transmission control module. In this video we will be troubleshooting the CAN network using a lab scope. In Part 2 https://youtu.be/GPQ8EKtvM_g we repair this vehicle and are surprised by what we find. Here is the link to Tommy's YouTube channel Positive Lead Diagnostics https://www.youtube.com/channel/UCiFSILHjs5XZecZJDwn7ieA Tools used - AES LineSPI (SMART BOB) https://www.aeswave.com/cart.php?m=affiliate_go&affiliateID=60df1b5cf6e5582 af6ff81c728f42d0d&go=https://www.aeswave.com/AES-LineSPI-SMART-BOB-p8754.ht ml - Test Drive Test Leads for the Snap-on VERUS https://www.aeswave.com/cart.php?m=affiliate_go&affiliateID=60df1b5cf6e5582 af6ff81c728f42d0d&go=https://www.aeswave.com/Test-Drive-Test-Leads-for-the- Snap-on-VERUS-p9036.html - VCDS® with HEX-NET® Pro https://www.aeswave.com/cart.php?m=affiliate_go&affiliateID=60df1b5cf6e5582 af6ff81c728f42d0d&go=https://www.aeswave.com/VCDS-with-HEX-NET-Pro-p9553.ht ml Related videos - Poor running, flashing CEL, no codes (bad computer ground) - Toyota https://youtu.be/44dP6X3QS5A - How to test a computer ground circuit (Audi) https://www.youtube.com/watch?v=fp_XZm-8nrA - ScannerDanner Premium Audi S5 series https://www.youtube.com/watch?v=fhNjX-hHXPM https://www.youtube.com/watch?v=X8yUjpOCAFY https://www.youtube.com/watch?v=iwdlIUW6niM&t=329s 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!





Fuel psi less than 50 psi = no start (GM CPI Vortec)
This video covers the basics of fuel pump pressure, current, power and ground testing that can be applied to ANY electric fuel pump. We also go into some unique properties of the GM CPI “poppet” style injection system, and where it differs from typical fuel injection systems. Lower than normal fuel pressure is often misdiagnosed on the central port injection system. For example: Fuel psi at 49 psi during cranking will be a no start! Just about every other fuel injection system will start and run fine with this kind of pressure. But the GM CPI needs a minimum of 50 psi to open the mechanical injector poppet nozzles. This design was used on the 4.3, 5.0 and 5.7 engines throughout the 90s. Engine Performance Diagnostics chapter 16 pages 2 - 6, 9 - 16 Symptoms - intermittent no start condition - starts when a fuel source is used (carb. Clean, starting fluid etc) and may continue to run normally after it starts - possible hesitation/bog on acceleration once running depending on how weak the pump is - fuel system lean trouble codes (P0171, P0174) Fix - fuel pump replacement Tests shown - how to check fuel pressure on a GM CPI system - how to use a GM fuel pump test connector and fused jumper wire to energize a fuel pump - using a low amp probe and scope to check an electric fuel pump - how to check an electric fuel pump power and ground - understanding the impact of a plugged fuel filter on fuel pump current Tools used - fuel pressure gauge - low amp probe - fused jumper wire - lab scope Playlist - (Chapters 14, 15,16) Fuel Delivery and Fuel Pressure Testing https://www.youtube.com/playlist?list=PLAFYVCyenqcrstVqfSc1PCbQ1pebuNIO6 Related videos - GM Fuel Pump Relay Testing https://youtu.be/McnXLcJNVfI - Low Fuel Pressure from a bad fuel pump ground (Ford Ranger) https://youtu.be/rQ7tvIxQSt0 - How to identify and repair a leaking fuel pressure regulator (GM CPI system) part 1 https://youtu.be/09_wQ9yQ85A - How to identify and repair a leaking fuel pressure regulator (GM CPI system) part 2 https://youtu.be/dAAFM3zlJME - Fuel Pump Electrical Circuits Description and Operation https://youtu.be/Rqtfrx-HeD0 - Symptoms and Causes of Low Fuel Pressure (Part 1) https://youtu.be/RyEPOeQB0Zg 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!





tps gone bad sputters
How to tell if your tps has has gone bad mine was doing it at about 1800 rpm hope this helps someone





Stage 0 TPS sensor cleaning
Followup to the video about different throttlebodies how to clean the TPS sensor




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