Alain Posted January 26, 2021 Share Posted January 26, 2021 Hello everyone, i own a buick reatta 1988 everything was fine running well , ichange the spark plug and cable wire, and now i have a code diagnostic code E021, can someone help me how to fix it or give informations to what to do or check thank you. Link to comment Share on other sites More sharing options...
Ronnie Posted January 26, 2021 Share Posted January 26, 2021 Welcome to the forum! E021 is a code for TPS voltage being too high. Will the engine start and run? Link to comment Share on other sites More sharing options...
Alain Posted January 26, 2021 Topic Author Share Posted January 26, 2021 thank you,it start sometime and run and suddenly shout off but its getting harder to start it and make run again i check and its say something about changing the Tps sensor to the connection to the maf its say also we can adjut that the TPS if it is that part i dont mind to buy the part and i know the IAC is more for idle running fine, i can change both if its help thank for your help Link to comment Share on other sites More sharing options...
Ronnie Posted January 26, 2021 Share Posted January 26, 2021 First check to see what the TPS is reading. To do that go into diagnostics like you did when you checked the codes. After it goes through the code checking process select ECM when asked. Then go to "ECM DATA" and select ED01. The throttle position voltage will be displayed. Without pressing the gas pedal the TPS reading should be about .40 volts. What reading do you get? As you slowly press down on the gas pedal the reading should increase smoothly all the way to wide open throttle. Link to comment Share on other sites More sharing options...
Alain Posted January 26, 2021 Topic Author Share Posted January 26, 2021 Sorry sir , im at work break time... okay if i follow you i go diagnostic and data to ED01 i should read like .40 volts ,i guess the key on for current and if i depress the pedal slowly it should increase right and if its not increasing does it mean the sensor is bad and as to be change even if the car is not running cause i cant make it start run for now i m still able to do that test okay ill check that tomorrow ill come back to you thank you really appreciate for your help and time Link to comment Share on other sites More sharing options...
Ronnie Posted January 26, 2021 Share Posted January 26, 2021 1 hour ago, Alain said: i guess the key on for current and if i depress the pedal slowly it should increase Correct. You must have the key on in order to enter diagnostics and you keep the key on during the process of checking the TPS voltage. The engine does not have to be running to check the voltage. Link to comment Share on other sites More sharing options...
Alain Posted January 27, 2021 Topic Author Share Posted January 27, 2021 Hello sir good monring, i was working until midnight last night, okay i went to check this morning and on screen to data its indicate ED01 reading is 80, and if i depress the fuel pedal its increase in reading 80 is too high for sure, so where do i go from there is there adjustment or just by another parts sensor tps thank you for your help. Link to comment Share on other sites More sharing options...
Ronnie Posted January 27, 2021 Share Posted January 27, 2021 The ED01 reading is too high. First check out the connector and the wires going to the TPS to make sure they are in good condition and you have a good connection. Try to adjust the TPS by loosening the screws holding it on just enough so you can turn it. Then enter diagnostics and go to ED01 so you can observe the TPS voltage. Turn the TPS slowly and see if the TPS voltage changes on the diagnostics screen. If it does, try to get it down to .38 - .40 volts. If you can't change the TPS voltage you will probably need to replace the TPS and try adjusting the voltage again. Link to comment Share on other sites More sharing options...
Alain Posted January 27, 2021 Topic Author Share Posted January 27, 2021 thank you sir one more question do you know if i turn tps clockwise or opposite way ill check that as soon as i can and come back to you. its 20 days work and only one day off up to now as i work as a nurse thank you again for your time that s help me ,have a good day Link to comment Share on other sites More sharing options...
Ronnie Posted January 27, 2021 Share Posted January 27, 2021 2 hours ago, Alain said: do you know if i turn tps clockwise or opposite way Just off the top of my head I don't. You will see which way you need to turn it by watching ED01 voltage in diagnostics if the TPS is in good working order. Link to comment Share on other sites More sharing options...
Ronnie Posted January 27, 2021 Share Posted January 27, 2021 2 hours ago, Alain said: only one day off up to now as i work as a nurse thank you again for your time that s help me Thank you for all you do. I know this is a hard time to be a nurse. I'm happy to be able to help you. 1 2 1 Link to comment Share on other sites More sharing options...
Alain Posted January 29, 2021 Topic Author Share Posted January 29, 2021 good morning sir one day off work a little cold today outside , im going to check for the buick reatta and try to adjust the tps sensor if i can as you told me .thank for your support, yes that virus is something ,im glad to be part of helping people suffering ,i hope that virus will be over and life get back to normal ,have a good day 1 Link to comment Share on other sites More sharing options...
Alain Posted January 29, 2021 Topic Author Share Posted January 29, 2021 hello just to do a follow up car was outside a little cold and i was able to undo the screw for the sensor ,question stupid but i just have to loose it , right i did turn key on and when i turn clockwise its decrease voltage, but really sensitive when you screw back it , the reading was 80 i did had .40 after i adjust it but battery was dead so i need to charge it to try it but the reading after was 1, something probably from tight it its change ,anyway i wait for the battery to charge full and try it later,thanks again ill come back have a good day . Link to comment Share on other sites More sharing options...
Ronnie Posted January 30, 2021 Share Posted January 30, 2021 The readings you are getting may not be accurate with a dead battery. Try again with a fully charged battery. Be patient and get it adjusted properly when the screws are tight. Link to comment Share on other sites More sharing options...
Alain Posted January 31, 2021 Topic Author Share Posted January 31, 2021 good morning to you sir. i almost there okay i charge the battery dont know if i will do it today really cold as the car is outside. i f i follow you if i can adjust the sensor to .40 do i have to do something on the screen diagnotisc data or it will register settle it self at the next starting indicating. 40 after when i check again.i know im slow and its take time to do it but i dont stop working 24 days in a row i work almost all month. that covid virus....:( Link to comment Share on other sites More sharing options...
Alain Posted February 5, 2021 Topic Author Share Posted February 5, 2021 good morning sir. sorry delay working overtime so busy work, i did follow what your instruction, i adjust tps ,it did move a little after i will have to adjust again, the car start run seem okay, but die once again , i bought a new tps took a chance to change the part, question is it possible can be the sensor crank down behind the harmonic balancer ,cant it make stop running suddently and after a while start again. i have to find that intermittent problem, thanks again for your help Link to comment Share on other sites More sharing options...
Ronnie Posted February 5, 2021 Share Posted February 5, 2021 3 hours ago, Alain said: question is it possible can be the sensor crank down behind the harmonic balancer ,cant it make stop running suddently and after a while start again. There are several things that could cause it to stop running suddenly but before moving on to something else you should get the TPS adjusted correctly. You don't mention the voltage on the new TPS. It will have to be adjusted to .38 - .40 volts with the throttle closed. Then the voltage should steadily increase as you open the throttle. Did the code E021 go away after you installed the new TPS? 1 Link to comment Share on other sites More sharing options...
Alain Posted February 7, 2021 Topic Author Share Posted February 7, 2021 Hello there how are you! sorry for the delay always working.. the new tps i put in is reading fine .40 volts as you told me the car start run for 5 minutes and die suddenly without doing nothing, is there something else to do crank sensor cam sensor etc... i dont know more im lost here... thanks sir Link to comment Share on other sites More sharing options...
Alain Posted February 7, 2021 Topic Author Share Posted February 7, 2021 ps do the IAC will do interference just thinking .... Link to comment Share on other sites More sharing options...
Ronnie Posted February 7, 2021 Share Posted February 7, 2021 14 minutes ago, Alain said: Hello there how are you! sorry for the delay always working.. the new tps i put in is reading fine .40 volts as you told me the car start run for 5 minutes and die suddenly without doing nothing, is there something else to do crank sensor cam sensor etc... i dont know more im lost here... thanks sir If the TPS is working properly and assuming the code E021 is gone, I think your next step should be getting a fuel pressure tester to make sure fuel pressure is correct. Instructions for doing that are in the ROJ How-to Guides at the top of the page. Link to comment Share on other sites More sharing options...
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