P1637
#101
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I don't think my girlfriend would appreciate being called 'the staff'. Although that isn't going to stop me from calling her that anyways.
This morning was the combo breaker. The car worked perfectly and even the throttle functionality wasn't weird.
I went through the engine bay and pulled every lead and ground wire i could find and cleaned them, then pulled every fuse and relay and replaced them with new.
This morning was the combo breaker. The car worked perfectly and even the throttle functionality wasn't weird.
I went through the engine bay and pulled every lead and ground wire i could find and cleaned them, then pulled every fuse and relay and replaced them with new.
#102
#103
#104
#105
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Woke up today to a text message from the module repair guy saying that the module that i sent back to him was not the module that he loaned me.
It had a warranty sticker from another module repair company and had not gone through his diagnostic or repair. He wanted me to send him his module back and that i "must have bought this one from another company and still have the one i sent you laying around somewhere".
I have only ever dealt with him and I had met him personally and taken that very module from his hands and stuck it in the car the last time we worked together on this. I had noticed that it didn't have his sticker on it and thought that it was a core he got from a customer and that he tested it and it passed testing so he gave it to me to try in my car.
Apparently what had actually happened is that he accidentally gave me a customers core that was non tested non repaired and then it got to wreak havoc in my car for six months or so.
So that explains why i was having such bad luck with abs modules.
The first one that I was sent was the wrong model #, since the car came with the wrong model # abs module installed when i bought the car.
The second and third ones I was sent had the wrong software installed on them.
The fourth one that I was sent was the correct model and software revision, but had intermittent errors cause it was an untested customer core.
The fifth one just magically worked because we finally had a repaired correct hardware and software model module installed in the car.
It had a warranty sticker from another module repair company and had not gone through his diagnostic or repair. He wanted me to send him his module back and that i "must have bought this one from another company and still have the one i sent you laying around somewhere".
I have only ever dealt with him and I had met him personally and taken that very module from his hands and stuck it in the car the last time we worked together on this. I had noticed that it didn't have his sticker on it and thought that it was a core he got from a customer and that he tested it and it passed testing so he gave it to me to try in my car.
Apparently what had actually happened is that he accidentally gave me a customers core that was non tested non repaired and then it got to wreak havoc in my car for six months or so.
So that explains why i was having such bad luck with abs modules.
The first one that I was sent was the wrong model #, since the car came with the wrong model # abs module installed when i bought the car.
The second and third ones I was sent had the wrong software installed on them.
The fourth one that I was sent was the correct model and software revision, but had intermittent errors cause it was an untested customer core.
The fifth one just magically worked because we finally had a repaired correct hardware and software model module installed in the car.
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DavidYau (03-19-2020)
#107
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I have several times in this thread already.
I don't think i should name and shame him though, at the end of the day even though he made a mistake that caused me to waste a lot of time on the car, he still did so for free and offered his own time to try and help troubleshoot the problems of the car.
If you want to chaulk the mishandling of the module up to a human mistake, everything apart from that he went above and beyond to help me fix my car.
I don't think i should name and shame him though, at the end of the day even though he made a mistake that caused me to waste a lot of time on the car, he still did so for free and offered his own time to try and help troubleshoot the problems of the car.
If you want to chaulk the mishandling of the module up to a human mistake, everything apart from that he went above and beyond to help me fix my car.
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crbass (03-18-2020)
#108
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I have several times in this thread already.
I don't think i should name and shame him though, at the end of the day even though he made a mistake that caused me to waste a lot of time on the car, he still did so for free and offered his own time to try and help troubleshoot the problems of the car.
If you want to chaulk the mishandling of the module up to a human mistake, everything apart from that he went above and beyond to help me fix my car.
I don't think i should name and shame him though, at the end of the day even though he made a mistake that caused me to waste a lot of time on the car, he still did so for free and offered his own time to try and help troubleshoot the problems of the car.
If you want to chaulk the mishandling of the module up to a human mistake, everything apart from that he went above and beyond to help me fix my car.
I have some strong suspicion that some of the ABS issues that keep showing up on this forum are vendors who don't quite know/appreciate the details required to make what they are selling work (and which one is appropriate for which vehicle), and it's likely going to be rare that someone has a CAN logger to notice it's spitting out the wrong heartbeat signal, for example. Thus far, this might be you and me.
#109
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He has been repairing these for years i believe. He does the ecu, door modules, abs, seat modules.
The reason i got the modules #2 and #3 both with the software problem was because it took me a month, and multiple attempts of using the wrong software to convince him that there were software differences that caused incompatibilites in these modules.
He still really didn't believe me until he bought a 97 xk8 himself to try modules on and discovered that what I had been saying was true. And then every time since that he has talked about it he keeps saying it as though he discovered this fact and that it is a secret that no one else knows ( including me who told him about it ).
He also was telling me about a huge stack of abs modules that he thought were broken until he got this 97 and now magically they all work on the 97 car and all of his tested good modules don't work on the 97 car.
So he had been stockpiling good modules that had software on them for the earlier cars and was just throwing them in a junk pile i believe.
The reason i got the modules #2 and #3 both with the software problem was because it took me a month, and multiple attempts of using the wrong software to convince him that there were software differences that caused incompatibilites in these modules.
He still really didn't believe me until he bought a 97 xk8 himself to try modules on and discovered that what I had been saying was true. And then every time since that he has talked about it he keeps saying it as though he discovered this fact and that it is a secret that no one else knows ( including me who told him about it ).
He also was telling me about a huge stack of abs modules that he thought were broken until he got this 97 and now magically they all work on the 97 car and all of his tested good modules don't work on the 97 car.
So he had been stockpiling good modules that had software on them for the earlier cars and was just throwing them in a junk pile i believe.
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cjd777 (03-18-2020)
#110
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He has been repairing these for years i believe. He does the ecu, door modules, abs, seat modules.
The reason i got the modules #2 and #3 both with the software problem was because it took me a month, and multiple attempts of using the wrong software to convince him that there were software differences that caused incompatibilites in these modules.
He still really didn't believe me until he bought a 97 xk8 himself to try modules on and discovered that what I had been saying was true. And then every time since that he has talked about it he keeps saying it as though he discovered this fact and that it is a secret that no one else knows ( including me who told him about it ).
He also was telling me about a huge stack of abs modules that he thought were broken until he got this 97 and now magically they all work on the 97 car and all of his tested good modules don't work on the 97 car.
So he had been stockpiling good modules that had software on them for the earlier cars and was just throwing them in a junk pile i believe.
The reason i got the modules #2 and #3 both with the software problem was because it took me a month, and multiple attempts of using the wrong software to convince him that there were software differences that caused incompatibilites in these modules.
He still really didn't believe me until he bought a 97 xk8 himself to try modules on and discovered that what I had been saying was true. And then every time since that he has talked about it he keeps saying it as though he discovered this fact and that it is a secret that no one else knows ( including me who told him about it ).
He also was telling me about a huge stack of abs modules that he thought were broken until he got this 97 and now magically they all work on the 97 car and all of his tested good modules don't work on the 97 car.
So he had been stockpiling good modules that had software on them for the earlier cars and was just throwing them in a junk pile i believe.
Also a tad disorganized?
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DavidYau (03-19-2020)
#111
#112
![Default](/forum/images/icons/icon1.gif)
WERE YOU EVER ABLE TO SOLVE YOUR P1637 PROBLEM, pass smog, and can you drive the car WITHOUT FEAR?
#113
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I bought my car in a non working status and found paperwork that indicated that it had been bouncing around auctions with different jag dealerships trying to scoop the car up cheap and fix it quickly to turn a profit.
Naturally none of them were able to fix the car and would just pawn it off to the next party that thought they were smarter.
The first of my issues was that the ABS module installed on the car had the famous issue where the leads needed to be resoldered in order for it to work again.
Unfortunately for me, once that ABS module started communicating with the car after the repair, it was quite unhappy.
After trial and error working with a repair shop and intercepting the CAN bus traffic, it turned out that someone had installed an ABS module with the wrong firmware.
Once I managed to get the correct ABS module on the car with the correct firmware, the car drove properly without fault for months and I managed to get it smogged.
Then the car brought back all of the same error codes but this time with a vengeance.
I had been reading up other people who had similar issues with the ABS module and this error code and found that some of them were reporting that their ECU was bad.
I remember inspecting my ECU at one point and noting that the capacitors had leaked a bit in the past and someone did a poor job of cleaning it up.
I sent the ECU off to the module repair guy and he fixed it and sent it back and the car has been reliable since.
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michaelh (09-25-2021)
#114
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^^ For some reason, the '97 ECMs suffer from leaking capacitors that can cause an array of seemingly-bizarre error codes. Your P1637 does list ECM failure as a possible cause.
Replacing these capacitors isn't difficult if you can wield a soldering iron, and the case comes apart without the need for a dremel
Even if the caps are not the cause, it is a straightforward PM to replace them as it appears that many fail eventually, sometimes damaging the circuit board.
Replacing these capacitors isn't difficult if you can wield a soldering iron, and the case comes apart without the need for a dremel
![Smile](https://www.jaguarforums.com/forum/images/smilies/smile.gif)
#115
#116
![Default](/forum/images/icons/icon1.gif)
that was denso’s job not theirs
#117
![Default](/forum/images/icons/icon1.gif)
^^ For some reason, the '97 ECMs suffer from leaking capacitors that can cause an array of seemingly-bizarre error codes. Your P1637 does list ECM failure as a possible cause.
Replacing these capacitors isn't difficult if you can wield a soldering iron, and the case comes apart without the need for a dremel
Even if the caps are not the cause, it is a straightforward PM to replace them as it appears that many fail eventually, sometimes damaging the circuit board.
Replacing these capacitors isn't difficult if you can wield a soldering iron, and the case comes apart without the need for a dremel
![Smile](https://www.jaguarforums.com/forum/images/smilies/smile.gif)
![Frown](https://www.jaguarforums.com/forum/images/smilies/frown.gif)
But since most other things don't seem to work, and the list of warnings and idiot lights keeps growing, I'll try whatever I can before taking the car to a Jag shop.
So,where do I start?
Last edited by oldjaglover; 09-26-2021 at 01:08 PM.
#118
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My problem was compound.
I bought my car in a non working status and found paperwork that indicated that it had been bouncing around auctions with different jag dealerships trying to scoop the car up cheap and fix it quickly to turn a profit.
Naturally none of them were able to fix the car and would just pawn it off to the next party that thought they were smarter.
The first of my issues was that the ABS module installed on the car had the famous issue where the leads needed to be resoldered in order for it to work again.
Unfortunately for me, once that ABS module started communicating with the car after the repair, it was quite unhappy.
After trial and error working with a repair shop and intercepting the CAN bus traffic, it turned out that someone had installed an ABS module with the wrong firmware.
Once I managed to get the correct ABS module on the car with the correct firmware, the car drove properly without fault for months and I managed to get it smogged.
Then the car brought back all of the same error codes but this time with a vengeance.
I had been reading up other people who had similar issues with the ABS module and this error code and found that some of them were reporting that their ECU was bad.
I remember inspecting my ECU at one point and noting that the capacitors had leaked a bit in the past and someone did a poor job of cleaning it up.
I sent the ECU off to the module repair guy and he fixed it and sent it back and the car has been reliable since.
I bought my car in a non working status and found paperwork that indicated that it had been bouncing around auctions with different jag dealerships trying to scoop the car up cheap and fix it quickly to turn a profit.
Naturally none of them were able to fix the car and would just pawn it off to the next party that thought they were smarter.
The first of my issues was that the ABS module installed on the car had the famous issue where the leads needed to be resoldered in order for it to work again.
Unfortunately for me, once that ABS module started communicating with the car after the repair, it was quite unhappy.
After trial and error working with a repair shop and intercepting the CAN bus traffic, it turned out that someone had installed an ABS module with the wrong firmware.
Once I managed to get the correct ABS module on the car with the correct firmware, the car drove properly without fault for months and I managed to get it smogged.
Then the car brought back all of the same error codes but this time with a vengeance.
I had been reading up other people who had similar issues with the ABS module and this error code and found that some of them were reporting that their ECU was bad.
I remember inspecting my ECU at one point and noting that the capacitors had leaked a bit in the past and someone did a poor job of cleaning it up.
I sent the ECU off to the module repair guy and he fixed it and sent it back and the car has been reliable since.
Gotta add some DOT4, too, but the reservoir looks pretty full and I only lost a few drops when R&R the ABS module. These cars are far too finicky!
#119
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CEL (P1637), ABS light on, no speedometer, "no tccm" light on, and a new one "INCORRECT PARTS INSTALLED"
I can't remember exactly what I did to fix it, but I think it involved removing the abs electrical connector and reinstalling it, and then removing the battery terminals and letting the car sit in timeout overnight before reconnecting.
I wasn't convinced then, nor am I convinced now, that these Christmas tree errors are always more serious than just the car remembering that it was unable to communicate with the module for a brief period of time and telling you all about it.
Helping it forget about its troubles might help you forget about yours.
I also had to replace the battery in the car 3 different times through the course of troubleshooting my errors to find a battery that hasn't given me Christmas light error codes.
If the problem persists after checking connections and letting the car reboot, then maybe I would heed the warnings and start double checking that the soldering work you did to the power pins was successful, and that the ECU is undamaged.
The ECU can be found in the passenger side of the engine bay mirrored where the brake booster would be on the drivers side. It is a grey box with tons of wires coming out of it. The transmission controller is sitting right in front of it and might need to be removed to get enough room to remove the ECU. It is a 5 minute job with just a couple torx bolts holding the cover on the compartment.
These cars are far too finicky!
Last edited by Mad Hatter; 09-25-2021 at 04:09 PM.
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DavidYau (09-25-2021),
oldjaglover (09-25-2021)
#120
Join Date: Apr 2014
Location: Jersey, Channel Islands
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Either way, electrolytic caps are not forever as their characteristics and efficiency degrade over time. A visual inspection may not show any clues, or they can fail spectacularly, as in greenforest56's case (long):
https://www.jaguarforums.com/forum/x...4/#post1776440
https://www.autoecu.com/jaguar-xk8-e...-instructions/
You may find (as I did) that the retaining screws are 'tamperproof' rather than torx, and that once you have the cover removed, you need to first pull the TCM out of the way.
There are seven caps that should be replaced:- one of which is hiding under the daughter pcb.
I posted the part #s here:
https://www.jaguarforums.com/forum/x...6/#post1806456
Cost is ~$6.
I can't promise that this will solve your issue, but it's good PM for the early ECM units.
Last edited by michaelh; 09-26-2021 at 07:55 PM.
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Jon89 (09-27-2021)