Hesitation and idle problems from a bad TPS (OBD1 Eclipse)
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- Опубліковано 8 вер 2024
- 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
• (Chapter 7) Potentiome...
Related videos
- How to test TPS wiring with a scan tool (any car)
• How to test TPS wiring...
- How to test throttle position sensor wiring with a resistor (any car)
• How to test throttle p...
- Throttle Position Sensor test (voltmeter and scope)
• Throttle Position Sens...
- How to test a throttle position sensor (P0121, P0122) GM wiring integrity
• How to test a throttle...
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 www.scannerdan... 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!
Disclaimer:
Due to factors beyond the control of ScannerDanner LLC, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. ScannerDanner LLC assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. ScannerDanner LLC recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of ScannerDanner LLC, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not ScannerDanner LLC.
This guy is the master. I love the way he explains everything. His words let you know he really becomes one with the systems he's testing. Almost as if he flies inside the damn electronics and analyses from within. I bow to his superior knowledge. He's the reason I am a mobile mechanic. 2 years studying and with his lessons I felt comfident enough to go out there and charge. Not bad at auto electrics now and its Paul I have to thank entirely. 11/10 dude.
Oh I bought his book too and it is amazing. Highly recommend you get it. Under £40 and just amazing.
Thanks so much James!
My Subaru has the same symptoms described in the video. I've been suspecting the TPS. Surging idle, high idle, low idle, wandering idle, poor acceleration; then it runs perfect. Sometimes I shut it off and restart it and then it runs perfect.
I'll test it with a DVOM.
Great video and great explanations, by the way. Wire harness integrity test was a plus.
This video helped me identify the problem on my 1g GSX! I wasn't sure if the tps was at fault until I watched your video and had the exact same symptoms. I didn't think to do the snap throttle test!
Thank you!!!!!
Good Afternoon Sir ScannerDanner take care and have a great day Sir ScannerDanner
Thanks 👍
From Nick Ayivor from London England UK 🇬🇧
I never get tire of watching your videos , when I watch it again I realized i missed or I did not absorb some thing, you're awesome teacher hard worker to dig to the root of the cause keep it up.
I'm glad I came across this video. For the past few days I've been trying to find the right accessories to plug into DLC of a 1994 Mitsubishi 3000GT. No need now for the keyed adapter or Personality Key K7A. Saves me about $100.
This is my Talon! I have to thank Danner for helping me with my car. Also if anyone has a passion for cars or trucks, I would recommend going to RTI.
Thanks to your videos I have a 2001 Mustang that runs like new..Since changing the TPS First time I have ran it was this morning. 50 plus miles. Passing gear was great and it didn't mess up at all downshifting out of over drive. Nor has it accelerated on it's own lol.
- Now if I can make sure the coils are good with the multi-meter ill be happy. Two primary coils read 1.6 an the last was 1.0. Not sure if this is normal. Haven't checked the secondaries yet. Got to stop this header leak on the drivers side an hopefully it will stop the hesitation some more even. :) You are the man !
The ohmmeter is only good sometimes. If 1.6 is your spec, then I do not like the 1.0 coil, but one of your 1.6 ohm coils could still be bad. In other words if it tests good it could still be bad, if it tests bad it's bad.
Make sense?
Use Mode 6 on your OBD-II scanner to ID which cylinder is misfiring. I think it is test ID $53? I have some videos on this
I show it here ua-cam.com/video/6kvYjYT1_mM/v-deo.html
Thanks so much! It is always a pleasure to help someone who can help themselves and are not just looking for silver bullet fixes. Or what part to try next.
thanks man. it is nice that you recognize that. not much negative posts going on here.
@felplay vina cool, if you don't have a scope you can use an analog (needle type) voltmeter and count your sweeps
That's a very interesting method to check codes on that vehicle!
Very good info about the TPS. This issue relates to mine. Thank you so much.
Hi Paul I just got a call for 91 Mitsubishi 300 with the check engine light on, I will use your video to get the code, I think this will be great for test..
no, the yellow arrow is pointing toward the yellow crank signal. the one with the groups of four square waves. I see what your talking about though, guess I should have moved that arrow down a little
Paul, on page 22 of your book you have the green arrow pointing to the cam sensor and then you have the yellow arrow pointing to the green channel as the crank sensor.
U can also use a buzzer from radioshack and touch each end to the points and count the buzzer sounds. Count the number of buzzes and search google for a list of the codes.
Great job troubleshooting this. You know you stuff for sure.
Thanks Joel
I have a DRB-II with a super cartridge in it. I love whipping that out and getting a nice full set of data stream info off of old Chrysler vehicles. Never done it on a DSM car, though. I need the dlc adapter for it.
Hope they pay you well man you deserve
Thanks! Paul. Excellent video as usual.
Algo aprendi nuevo hoy.nice video
I don't know? Never tried it. It would be worth a shot. Let me know if it works. Thanks!
I think I like the old Ford blinking check engine light method a bit more!
Thanks for the video.
Nice review
hey robbie! thanks for the comment. did you put that tps in yet or are you gonna have our class do it?
awesome! that's a great tip thx
My application used your method and code 14 was present. However while doing the reference test with voltmeter key on enginge off, none of the 3 wires at TPS indicated
the 5v open loop. Any suggestions why? And want to say thank you for the cobalt video. The way you conducted the whole thing made so much sense.
Great video as always.
Thanks.
Except for the blinking CEL, that Chrysler concept is pretty much identical. If you were to probe the self test output and B+ you would get the exact same graph.
Thanks for this video.!
I have run into a simular isue after swapping ecu.
Is there a way. Or maybe do you have a video how to do this with a old school multi meter.?
Awesome stuff paul your the man
Thank you, sir.
I recently installed new tps on 92 ls400. but it's in such a bad spot for t pins how would I go about adjusting it to proper position I tried just using idle rpm with and without ac. it's obd 1. any suggestions? great videos I have been watching your great videos for awhile and it has definitely helped me get better at diagnosing my vehicles. thanks.
Paul thanks for uploading this, ive a vauxhall astra doing the same thing so this video helped me confirm it. I was wondering if you could upload a video on CAN? my friend has a 1999 Volkswagen Passat 1.9tdi automatic (I mostly work on diesels). When I scan the car with VAGCOM I get fault codes from modules on the car that there is no communication with the PCM and the PCM doesnt even come up on the scan. I found the problem is 7.8 Mega ohms of resistance between the CAN wires
hola buenas muy buen video, me a gustado muy claro, donde consigo esa hoja de fallas del mitsubishi eclipse ..... muchas gracias
Good stuff !!
So if the voltage was monitored with the engine running,it would probably show the voltage fluctuating to low volts?
ScannerDanner, could you also use a bulb or a led to read the codes?
I'm going to order the tps then I might do it at home, or maybe bring it in.
If the TPS tested OK, how would you test for a bad throttle actuator motor (or solenoid) ?
If you are talking about an electronic throttle body, the motor circuit is a reverse polarity design. A scan tool with bi-directional controls and the ability to look at desired and actual commands is key in troubleshooting those.
its nice but i want know what is the specification of the tool maybe i use it in my car
Hello, I have a question regarding TPS sensor. Is there any chance of opening the throttle body to get to the potentiometer and clean sensor contacts. Generally, can I make sensor to work properly with just cleaning contacts or is it better to change all unit? Thanks.
so the three wires on the connector was power, ground and signal?
Thanks for videos Danner, i have same engine with same intake also same tps on my 1994 Hyundai sonata a/t ( 3 wires means not included idle position censor in tps), my 1st question is 0,57 is a standart voltage for this type tps? 2nd how can i get true position for Tps? i know its working good but its not set true position on there, I have shop manual but that just say " if its not on true position, you can see shift lock issue with A/T tranny." so if i set 0,57 mv on tps than mean is it ok?
how can I get this fix? should I just replace the TPS? how can I recharge the wires with the meter
What scanner can u recommend for 1993 Nissan pickup
I have Elsawin, Bosch ESI tronic, and autodata but none of these show a CAN diagram, I understand about terminating resistors but dont know were these would be located, it must be a bad connection or wire somewhere between the PCM and Gateway, but havn't a clue were the gateway is. Any light you could throw on terminating resistors and CAN would be awesome. Also I lost my login password for your ebook, do you know how I can find this again?
Thanks Ben
HOPE YOU WILL HAVE DONE THE UPDATE ON THE E-BOOK FOR NEW PURCHASE
+lawal olawale the eBook is updated as well as the paper book. thanks!
When they tell you the price, ask them "Does that include the Vaseline?"
Damn, is that time on the vantage correct?
Hey Paul,tested TPS on my 93 maxima,i got 8.3 volts on a signal wire and on a five volts reference wire,why is that? I experienced some hesitation when I accelerate then smooth out. I didn’t extract the code....
how many wires are on your TPS? I believe on that year it is not a potentiometer but a switch. It has a WOT contact and an Idle contact. Not sure.
Hello, I have a P1390 code on my 1997 Eagle Talon (non-turbo). Can anyone help? I recently swapped another motor 420A and it runs good, however, its sluggish at times when I want to accelerate.
HOW CAN ONE GOT THE DATA NEEDS ON THIS TYPE OF CARS AND CAN PICOSCOPE BE USED AS THE ONE YOU USED ON THIS VIDEO
+lawal olawale yes, the picoscope could be used for this type of testing
Gr8. Vid there. I am
Trying to figure out an interment surging when at idle.
I was thinking it could be. TPS or IAC
.
Recently throttle body was removed as part of valve cover gasket replacement
2001 maxima
When it was all put back
I got some strange idle and p0505
Found an air intake tube leak . And the p0505 never came back
Then found a Sticky throttle and found a loose bolts for the throttle cable .
Now I get some random idle rev up and down when sitting in park after maybe driving a bit and then sits idle if for like 3 mins ( like waiting for a pick up order)
I have viewed live data on AD410 scanner and I see tps voltage moving and graph looks ok. I just haven’t been able to to get my scanner on it when it’s happening
Ideas?
Idle relearn! Crazy procedure on those Nissans
@@ScannerDanner with car warmed up 1) turn car to ON position (dont start) 2) wait exactly 3 seconds 3)push accelerator fully 5 times in 5 seconds 4) take foot off accelerator fully for 7 seconds exactly 5) push accelerator for 10 seconds, and the Check Engine Light will flash 6)fully release accelerator pedal the Check engine light will continue to blink 7) turn key to off position, and then to start to start car, with in 10 seconds ? if I remember correctly I saw this for newer maxima on Electric throttle bodies but wasn't sure for 2001 maxima since its cable driven. I might try it , what's the worse that could happen
@@ScannerDanner think I found it for 2001 maxima, www.nissanhelp.com/diy/maxima/projects/2000_2001_nissan_maxima_idle_air_volume_learning.php
@@dfields9511 that's the one!
@@ScannerDanner just did that procedure. it's now idling around 700 +/- 50 before I think it was idling around 800-900 rpm
Thanks
Fail safe mode?
my 87 suzuki swift has 4 wires tho...
Do I have to reset the ECU after TPS replacement?
On some cars yes, on others no. The ECM uses a "minimum TPS voltage" number that is learned and is retained in memory. New cars will issue a relearn on every key cycle and older cars it would only rewrite when battery voltage is interrupted. Make sense?
Does it mean the ECM is still (even if I already changed the TPS) substituting until I remove the negative terminal of the battery?
Not substituting but using the old TPS minimum voltage signal. This can cause a very high idle speed among other things.
It’s a three wires,TPS
I looked up the cost of a new sensor: $200 YIKES
I have the same kinda problem but long start and high idle when u trying to drive check my videos to understand better
Yeah tell me about it lol. This is my car.