Pulse Generator
I have been having problems with my auto transmission dropping into 3rd
from 4th. To correct the problem i've had to pull over switch off and back on again. This problem generally only occured within the first 20 mins of driving and then seemed to go away. After having it in to the dealer they say it's the pulse generator that needed to be replaced. I've done 127,000km What is the purpose of this part and what could cause it to fail? Also, they suggest i replace my tie rod ends what would cause these to need replacing? |
Re: Pulse Generator
Not sure about the pulse generator, but the tie rod ends are normal wear
items. If I did my math right that is about 79k miles, and that's not too bad for tie rod ends. (I think better in English units...) "jmh_ottawa" <john@minasu.com> wrote in message news:ebb166483b903a5e5b91e61f4f1ae774@localhost.ta lkaboutautos.com... >I have been having problems with my auto transmission dropping into 3rd > from 4th. To correct the problem i've had to pull over switch off and back > on again. This problem generally only occured within the first 20 mins of > driving and then seemed to go away. > > After having it in to the dealer they say it's the pulse generator that > needed to be replaced. > I've done 127,000km > > What is the purpose of this part and what could cause it to fail? > > Also, they suggest i replace my tie rod ends what would cause these to > need replacing? > > |
Re: Pulse Generator
The pulse generators are a/c voltage generators that serve as input and
output speed sensors for your transmission. Without correct readings from the pulse generators, the transmission computer has difficulty shifting into the appropriate gear at the appropriate time. When this problem occurs, the transmission computer places the transmission in fail-safe mode (third gear only). When you turn the vehicle off and restart it, you reset the fail-safe until the problem occurs again. The pulse generators bolt into the transmission case. In most vehicles 1994 and newer, one bolts into the top rear of the transmission (output speed sensor) and the other bolts into the end cover on the bottom front (input speed sensor). They come together as a set and aren't all that expensive. If you're able to use a socket wrench, you can purchase this part and do the repair yourself. Just make sure to compare wire length or use some other system to make sure you don't install the sensors in the incorrect positions. Depending on year and model vehicle, it's possible to reverse the locations of the sensors. |
Re: Pulse Generator
Yes 79k miles is right ;-)
I do about 20k miles a year ahhh the joy of living in Canada. The elantra is a 2002 model bought new late in 2001. I'll get them changed in the next few weeks. Thanks for the input. |
Re: Pulse Generator
Thanks hyundaitech.
The dealer did this for me yesterday and 100km of driving and everything is working fine. Thank god it wasn't a tranny problem.. i know that can get exspensive. phew. $320 Cdn /$257 US to get this job done. Parts were $209 cdn plus labour and taxes. |
Re: Pulse Generator
jmh_ottawa wrote: > Thanks hyundaitech. > > The dealer did this for me yesterday and 100km of driving and everything > is working fine. Thank god it wasn't a tranny problem.. i know that can > get exspensive. phew. > > $320 Cdn /$257 US to get this job done. > > Parts were $209 cdn plus labour and taxes. This is interesting...I guess you're happy now, but I wonder what part(S) got replaced... Can you tell us the part numbers listed on the repair order? |
Re: Pulse Generator
hyundaitech wrote: > The pulse generators are a/c voltage generators that serve as input and > output speed sensors for your transmission. Without correct readings from > the pulse generators, the transmission computer has difficulty shifting > into the appropriate gear at the appropriate time. When this problem > occurs, the transmission computer places the transmission in fail-safe > mode (third gear only). When you turn the vehicle off and restart it, you > reset the fail-safe until the problem occurs again. > The pulse generators bolt into the transmission case. In most vehicles > 1994 and newer, one bolts into the top rear of the transmission (output > speed sensor) and the other bolts into the end cover on the bottom ?>front 1994 and newer...where does that come from? Hyundai did not release any new or revised auto tranny for the MY1994 cars. > (input speed sensor). They come together as a set and aren't all that No, not all of them come together as a set. > expensive. If you're able to use a socket wrench, you can purchase this > part and do the repair yourself. Just make sure to compare wire length or > use some other system to make sure you don't install the sensors in the > incorrect positions. Depending on year and model vehicle, it's possible > to reverse the locations of the sensors. "Hyundaitech", let me ask you this... Do we know the pulse generators are defective on this vehicle? |
Re: Pulse Generator
"1994 and newer" originates from my experience as a Hyundai technician.
While you're correct that the mechanical elements of the transmission did not change, there were computer control changes and the placement of the pulse generators changed. It's possible this may have occurred with the 1995 model year; it's been long enough that I don't recall exactly now. And what makes me so sure I'm right about this change? I actually testified in a civil suit brought by a Hyundai owner against a repair facility who installed the incorrect transmission in his vehicle. The pulse generators were not reading the elements in the transmission that the computer was expecting them to read, so the transmission would not operate properly. You're also correct, theta, that not all of them come together as a set, but those that do not come as one piece called an input speed sensor and another called an output speed sensor. In fact, as I learned in a later post by the original poster which identified his year and model car, he does not have "pulse generators" but does indeed have separate input and output speed sensors. And no, I don't know that a speed sensor is defective on this vehicle. The original poster provided the information that his dealer had given him that diagnosis. I won't be able to know whether that's correct unless he brings his vehicle to me so I can diagnose it. But I suspect his dealer is competent enough to diagnose this -- especially considering that the original poster reports the problem went away after he had the work done. |
Re: Pulse Generator
hyundaitech wrote: > "1994 and newer" originates from my experience as a Hyundai technician. > While you're correct that the mechanical elements of the transmission did > not change, there were computer control changes and the placement of the > pulse generators changed. It's possible this may have occurred with the > 1995 model year; it's been long enough that I don't recall exactly now. > And what makes me so sure I'm right about this change? I actually > testified in a civil suit brought by a Hyundai owner against a repair > facility who installed the incorrect transmission in his vehicle. The Which Hyundai model? > pulse generators were not reading the elements in the transmission that > the computer was expecting them to read, so the transmission would not > operate properly. > > You're also correct, theta, that not all of them come together as a set, > but those that do not come as one piece called an input speed sensor and > another called an output speed sensor. In fact, as I learned in a later > post by the original poster which identified his year and model car, he > does not have "pulse generators" but does indeed have separate input and > output speed sensors. > > And no, I don't know that a speed sensor is defective on this vehicle. > The original poster provided the information that his dealer had given him > that diagnosis. I won't be able to know whether that's correct unless he > brings his vehicle to me so I can diagnose it. But I suspect his dealer > is competent enough to diagnose this -- especially considering that the > original poster reports the problem went away after he had the work done. |
Re: Pulse Generator
Well i'm happy that the problem seems to have gone away but still unhappy
that i had to get something like this replaced... but that's cars for you.. The part number i had replaced seems to be this: 42620-39051 Sensor Ass. The car i have is a 2002 Model Elantra. |
Re: Pulse Generator
jmh_ottawa wrote: > Well i'm happy that the problem seems to have gone away but still unhappy > that i had to get something like this replaced... but that's cars for > you.. > > The part number i had replaced seems to be this: > > 42620-39051 Sensor Ass. > > The car i have is a 2002 Model Elantra. That's pulse generator A(input speed sensor); U.S. list price is $66.90. i just checked the exchange rate and it would be about 83 CDN. dollars... Are you sure it's the only part on the R.O.? |
Re: Pulse Generator
It seems to be of course it wouldn't suprise me if the parts are imported
to the us and then get taxed heavily as they pass customs into canada. Also the dealer may be padding the price a little on the parts.. but either way when you have problems you have to rely on the people in the know to fix them... and that always costs. Maybe living in the US parts are a bit cheaper who knows. |
Re: Pulse Generator
>That's pulse generator A(input speed sensor); >U.S. list price is
>$66.90. >i just checked the exchange rate and it would >be about 83 CDN. >dollars... >Are you sure it's the only part on the R.O.? I called two other local dealers and both are charging the same for that part ($209cdn). Perhaps the part you looked up is different or there's a load of taxes or something being added when they are brought into canada. |
Re: Pulse Generator no reverse
i got 2000 accent automatic all the gears work fine.but when i put it in
reverse it feel like its in netural sometime it will go but very slow while the engine shackes.i maintenance the trans.every 20,000 miles.use the right fluild checked the dip stick while in netural still pink.no small metal parts in the dip stick.an the fluild smell fine.and no nosie or pings?? will the gears go out soon?if theres no reverse? what should i do its the only car we have.its has 106,000 miles on it,even got the transmission screen and pan clean.3 month back.any help thank you |
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