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ECU for Jeep Cherokee
Hi,
does anybody know, if there is some programming or calibration to be done if the engine control unit is replaced? Or do I just plug it in and thats it? Thanks for the advice. Jo |
Re: ECU for Jeep Cherokee
"reigelser" <reigelser@sbcglobal.net> wrote in message news:NuBqe.9401$_A5.776@newssvr19.news.prodigy.com ... > Hi, > does anybody know, if there is some programming or calibration to be done if > the engine control unit is replaced? Or do I just plug it in and thats it? > Thanks for the advice. Big difference among the years, IIRC... I'm pretty sure that all the modules have to agree on the odometer miles, among other things, on mine. ECM, PCM, CCCM, DRBII, DRBIII... alphabet soup. On my '00XJ, buried way down on pg 14-1 Fuel Systems, is the following: PCM VIN REPROGRAMMING OPERATION USE THE DRB SCAN TOOL TO REPROGRAM THE NEW POWERTRAIN CONTROL MODULE (PCM) WITH THE VEHICLES (sic) ORIGINAL IDEN- TIFICATION NUMBER (VIN) AND THE VEHI- CLES ORIGINAL MILEAGE. IF THIS STEP IS NOT DONE, A DIAGNOSTIC TROUBLE CODE (DTC) MAY BE SET. The way I read this, you can pop one in and it will work... but your MIL (malfunction indicator light) will illuminate, and I don't have a clue as to whether it will ever go out. There should be some safeguards preventing folks from resetting their odometers.. that's what this is all about. If you don't have a digital odometer, chances are you've got the earlier ECU, and can plug-and-go... it may take a few start-stop cycles to learn all the operating parms for your engine. Why the new ECU, btw? __ Steve .. __ Steve .. |
Re: ECU for Jeep Cherokee
"reigelser" <reigelser@sbcglobal.net> wrote in message news:NuBqe.9401$_A5.776@newssvr19.news.prodigy.com ... > Hi, > does anybody know, if there is some programming or calibration to be done if > the engine control unit is replaced? Or do I just plug it in and thats it? > Thanks for the advice. Big difference among the years, IIRC... I'm pretty sure that all the modules have to agree on the odometer miles, among other things, on mine. ECM, PCM, CCCM, DRBII, DRBIII... alphabet soup. On my '00XJ, buried way down on pg 14-1 Fuel Systems, is the following: PCM VIN REPROGRAMMING OPERATION USE THE DRB SCAN TOOL TO REPROGRAM THE NEW POWERTRAIN CONTROL MODULE (PCM) WITH THE VEHICLES (sic) ORIGINAL IDEN- TIFICATION NUMBER (VIN) AND THE VEHI- CLES ORIGINAL MILEAGE. IF THIS STEP IS NOT DONE, A DIAGNOSTIC TROUBLE CODE (DTC) MAY BE SET. The way I read this, you can pop one in and it will work... but your MIL (malfunction indicator light) will illuminate, and I don't have a clue as to whether it will ever go out. There should be some safeguards preventing folks from resetting their odometers.. that's what this is all about. If you don't have a digital odometer, chances are you've got the earlier ECU, and can plug-and-go... it may take a few start-stop cycles to learn all the operating parms for your engine. Why the new ECU, btw? __ Steve .. __ Steve .. |
Re: ECU for Jeep Cherokee
"reigelser" <reigelser@sbcglobal.net> wrote in message news:NuBqe.9401$_A5.776@newssvr19.news.prodigy.com ... > Hi, > does anybody know, if there is some programming or calibration to be done if > the engine control unit is replaced? Or do I just plug it in and thats it? > Thanks for the advice. Big difference among the years, IIRC... I'm pretty sure that all the modules have to agree on the odometer miles, among other things, on mine. ECM, PCM, CCCM, DRBII, DRBIII... alphabet soup. On my '00XJ, buried way down on pg 14-1 Fuel Systems, is the following: PCM VIN REPROGRAMMING OPERATION USE THE DRB SCAN TOOL TO REPROGRAM THE NEW POWERTRAIN CONTROL MODULE (PCM) WITH THE VEHICLES (sic) ORIGINAL IDEN- TIFICATION NUMBER (VIN) AND THE VEHI- CLES ORIGINAL MILEAGE. IF THIS STEP IS NOT DONE, A DIAGNOSTIC TROUBLE CODE (DTC) MAY BE SET. The way I read this, you can pop one in and it will work... but your MIL (malfunction indicator light) will illuminate, and I don't have a clue as to whether it will ever go out. There should be some safeguards preventing folks from resetting their odometers.. that's what this is all about. If you don't have a digital odometer, chances are you've got the earlier ECU, and can plug-and-go... it may take a few start-stop cycles to learn all the operating parms for your engine. Why the new ECU, btw? __ Steve .. __ Steve .. |
Re: ECU for Jeep Cherokee
"reigelser" <reigelser@sbcglobal.net> wrote in message news:NuBqe.9401$_A5.776@newssvr19.news.prodigy.com ... > Hi, > does anybody know, if there is some programming or calibration to be done if > the engine control unit is replaced? Or do I just plug it in and thats it? > Thanks for the advice. Big difference among the years, IIRC... I'm pretty sure that all the modules have to agree on the odometer miles, among other things, on mine. ECM, PCM, CCCM, DRBII, DRBIII... alphabet soup. On my '00XJ, buried way down on pg 14-1 Fuel Systems, is the following: PCM VIN REPROGRAMMING OPERATION USE THE DRB SCAN TOOL TO REPROGRAM THE NEW POWERTRAIN CONTROL MODULE (PCM) WITH THE VEHICLES (sic) ORIGINAL IDEN- TIFICATION NUMBER (VIN) AND THE VEHI- CLES ORIGINAL MILEAGE. IF THIS STEP IS NOT DONE, A DIAGNOSTIC TROUBLE CODE (DTC) MAY BE SET. The way I read this, you can pop one in and it will work... but your MIL (malfunction indicator light) will illuminate, and I don't have a clue as to whether it will ever go out. There should be some safeguards preventing folks from resetting their odometers.. that's what this is all about. If you don't have a digital odometer, chances are you've got the earlier ECU, and can plug-and-go... it may take a few start-stop cycles to learn all the operating parms for your engine. Why the new ECU, btw? __ Steve .. __ Steve .. |
Re: ECU for Jeep Cherokee
depends on the year starting in 04 all pcm,s are shipped with out software and
it has to progammed by vin now more salvage yard pcm swapping reigelser wrote: > Hi, > does anybody know, if there is some programming or calibration to be done if > the engine control unit is replaced? Or do I just plug it in and thats it? > Thanks for the advice. > > Jo |
Re: ECU for Jeep Cherokee
depends on the year starting in 04 all pcm,s are shipped with out software and
it has to progammed by vin now more salvage yard pcm swapping reigelser wrote: > Hi, > does anybody know, if there is some programming or calibration to be done if > the engine control unit is replaced? Or do I just plug it in and thats it? > Thanks for the advice. > > Jo |
Re: ECU for Jeep Cherokee
depends on the year starting in 04 all pcm,s are shipped with out software and
it has to progammed by vin now more salvage yard pcm swapping reigelser wrote: > Hi, > does anybody know, if there is some programming or calibration to be done if > the engine control unit is replaced? Or do I just plug it in and thats it? > Thanks for the advice. > > Jo |
Re: ECU for Jeep Cherokee
depends on the year starting in 04 all pcm,s are shipped with out software and
it has to progammed by vin now more salvage yard pcm swapping reigelser wrote: > Hi, > does anybody know, if there is some programming or calibration to be done if > the engine control unit is replaced? Or do I just plug it in and thats it? > Thanks for the advice. > > Jo |
Re: ECU for Jeep Cherokee
"tim bur" <dbrider@cac.net> wrote in message news:42ABA761.F70549FF@cac.net... > depends on the year starting in 04 all pcm,s are shipped with out software and > it has to progammed by vin > now more salvage yard pcm swapping ^^^^^^^ One letter... how it changes things. Tim probably meant 'no'... __ Steve .. > reigelser wrote: > > > Hi, > > does anybody know, if there is some programming or calibration to be done if > > the engine control unit is replaced? Or do I just plug it in and thats it? > > Thanks for the advice. > > > > Jo > |
Re: ECU for Jeep Cherokee
"tim bur" <dbrider@cac.net> wrote in message news:42ABA761.F70549FF@cac.net... > depends on the year starting in 04 all pcm,s are shipped with out software and > it has to progammed by vin > now more salvage yard pcm swapping ^^^^^^^ One letter... how it changes things. Tim probably meant 'no'... __ Steve .. > reigelser wrote: > > > Hi, > > does anybody know, if there is some programming or calibration to be done if > > the engine control unit is replaced? Or do I just plug it in and thats it? > > Thanks for the advice. > > > > Jo > |
Re: ECU for Jeep Cherokee
"tim bur" <dbrider@cac.net> wrote in message news:42ABA761.F70549FF@cac.net... > depends on the year starting in 04 all pcm,s are shipped with out software and > it has to progammed by vin > now more salvage yard pcm swapping ^^^^^^^ One letter... how it changes things. Tim probably meant 'no'... __ Steve .. > reigelser wrote: > > > Hi, > > does anybody know, if there is some programming or calibration to be done if > > the engine control unit is replaced? Or do I just plug it in and thats it? > > Thanks for the advice. > > > > Jo > |
Re: ECU for Jeep Cherokee
"tim bur" <dbrider@cac.net> wrote in message news:42ABA761.F70549FF@cac.net... > depends on the year starting in 04 all pcm,s are shipped with out software and > it has to progammed by vin > now more salvage yard pcm swapping ^^^^^^^ One letter... how it changes things. Tim probably meant 'no'... __ Steve .. > reigelser wrote: > > > Hi, > > does anybody know, if there is some programming or calibration to be done if > > the engine control unit is replaced? Or do I just plug it in and thats it? > > Thanks for the advice. > > > > Jo > |
Re: ECU for Jeep Cherokee
I need the ECU eventually because of a persistent TPS error. My mechanic
troubleshooted it and thinks its probably the ECU. But he thinks there has to be some reprogramming to be done, because I tried one from the junk yard before he looked into it and nothing changed (same TPS error, same mileage). It's a 97 inline 6 Cherokee. It works, but it doesn't start at first try and it is not very smooth if you want to accelerate from 65 to 75 without a kickdown. "Stephen Cowell" <scowell@sbcglobal.net> wrote in message news:JQXqe.18$kX4.14@newssvr30.news.prodigy.com... "tim bur" <dbrider@cac.net> wrote in message news:42ABA761.F70549FF@cac.net... > depends on the year starting in 04 all pcm,s are shipped with out software > and > it has to progammed by vin > now more salvage yard pcm swapping ^^^^^^^ One letter... how it changes things. Tim probably meant 'no'... __ Steve .. > reigelser wrote: > > > Hi, > > does anybody know, if there is some programming or calibration to be > > done if > > the engine control unit is replaced? Or do I just plug it in and thats > > it? > > Thanks for the advice. > > > > Jo > |
Re: ECU for Jeep Cherokee
I need the ECU eventually because of a persistent TPS error. My mechanic
troubleshooted it and thinks its probably the ECU. But he thinks there has to be some reprogramming to be done, because I tried one from the junk yard before he looked into it and nothing changed (same TPS error, same mileage). It's a 97 inline 6 Cherokee. It works, but it doesn't start at first try and it is not very smooth if you want to accelerate from 65 to 75 without a kickdown. "Stephen Cowell" <scowell@sbcglobal.net> wrote in message news:JQXqe.18$kX4.14@newssvr30.news.prodigy.com... "tim bur" <dbrider@cac.net> wrote in message news:42ABA761.F70549FF@cac.net... > depends on the year starting in 04 all pcm,s are shipped with out software > and > it has to progammed by vin > now more salvage yard pcm swapping ^^^^^^^ One letter... how it changes things. Tim probably meant 'no'... __ Steve .. > reigelser wrote: > > > Hi, > > does anybody know, if there is some programming or calibration to be > > done if > > the engine control unit is replaced? Or do I just plug it in and thats > > it? > > Thanks for the advice. > > > > Jo > |
Re: ECU for Jeep Cherokee
I need the ECU eventually because of a persistent TPS error. My mechanic
troubleshooted it and thinks its probably the ECU. But he thinks there has to be some reprogramming to be done, because I tried one from the junk yard before he looked into it and nothing changed (same TPS error, same mileage). It's a 97 inline 6 Cherokee. It works, but it doesn't start at first try and it is not very smooth if you want to accelerate from 65 to 75 without a kickdown. "Stephen Cowell" <scowell@sbcglobal.net> wrote in message news:JQXqe.18$kX4.14@newssvr30.news.prodigy.com... "tim bur" <dbrider@cac.net> wrote in message news:42ABA761.F70549FF@cac.net... > depends on the year starting in 04 all pcm,s are shipped with out software > and > it has to progammed by vin > now more salvage yard pcm swapping ^^^^^^^ One letter... how it changes things. Tim probably meant 'no'... __ Steve .. > reigelser wrote: > > > Hi, > > does anybody know, if there is some programming or calibration to be > > done if > > the engine control unit is replaced? Or do I just plug it in and thats > > it? > > Thanks for the advice. > > > > Jo > |
Re: ECU for Jeep Cherokee
I need the ECU eventually because of a persistent TPS error. My mechanic
troubleshooted it and thinks its probably the ECU. But he thinks there has to be some reprogramming to be done, because I tried one from the junk yard before he looked into it and nothing changed (same TPS error, same mileage). It's a 97 inline 6 Cherokee. It works, but it doesn't start at first try and it is not very smooth if you want to accelerate from 65 to 75 without a kickdown. "Stephen Cowell" <scowell@sbcglobal.net> wrote in message news:JQXqe.18$kX4.14@newssvr30.news.prodigy.com... "tim bur" <dbrider@cac.net> wrote in message news:42ABA761.F70549FF@cac.net... > depends on the year starting in 04 all pcm,s are shipped with out software > and > it has to progammed by vin > now more salvage yard pcm swapping ^^^^^^^ One letter... how it changes things. Tim probably meant 'no'... __ Steve .. > reigelser wrote: > > > Hi, > > does anybody know, if there is some programming or calibration to be > > done if > > the engine control unit is replaced? Or do I just plug it in and thats > > it? > > Thanks for the advice. > > > > Jo > |
Re: ECU for Jeep Cherokee
The TJ's ECU is known to be extremely reliable and just about
trouble-free. Have you already replaced the TPS and cleaned/reseated the electrical connection that connects the ECU to the TPS? Bad TPSs are easily replaced and far cheaper than replacing the ECU. Jerry reigelser wrote: > I need the ECU eventually because of a persistent TPS error. My mechanic > troubleshooted it and thinks its probably the ECU. But he thinks there has > to be some reprogramming to be done, because I tried one from the junk yard > before he looked into it and nothing changed (same TPS error, same mileage). > It's a 97 inline 6 Cherokee. It works, but it doesn't start at first try and > it is not very smooth if you want to accelerate from 65 to 75 without a > kickdown. > > "Stephen Cowell" <scowell@sbcglobal.net> wrote in message > news:JQXqe.18$kX4.14@newssvr30.news.prodigy.com... > > "tim bur" <dbrider@cac.net> wrote in message > news:42ABA761.F70549FF@cac.net... > >>depends on the year starting in 04 all pcm,s are shipped with out software >>and >>it has to progammed by vin >>now more salvage yard pcm swapping > > ^^^^^^^ > > One letter... how it changes things. > Tim probably meant 'no'... > __ > Steve > . > > > > > >>reigelser wrote: >> >> >>>Hi, >>>does anybody know, if there is some programming or calibration to be >>>done if >>>the engine control unit is replaced? Or do I just plug it in and thats >>>it? >>>Thanks for the advice. >>> >>>Jo >> > > -- Jerry Bransford PP-ASEL N6TAY See the Geezer Jeep at http://members.cox.net/jerrypb/ |
Re: ECU for Jeep Cherokee
The TJ's ECU is known to be extremely reliable and just about
trouble-free. Have you already replaced the TPS and cleaned/reseated the electrical connection that connects the ECU to the TPS? Bad TPSs are easily replaced and far cheaper than replacing the ECU. Jerry reigelser wrote: > I need the ECU eventually because of a persistent TPS error. My mechanic > troubleshooted it and thinks its probably the ECU. But he thinks there has > to be some reprogramming to be done, because I tried one from the junk yard > before he looked into it and nothing changed (same TPS error, same mileage). > It's a 97 inline 6 Cherokee. It works, but it doesn't start at first try and > it is not very smooth if you want to accelerate from 65 to 75 without a > kickdown. > > "Stephen Cowell" <scowell@sbcglobal.net> wrote in message > news:JQXqe.18$kX4.14@newssvr30.news.prodigy.com... > > "tim bur" <dbrider@cac.net> wrote in message > news:42ABA761.F70549FF@cac.net... > >>depends on the year starting in 04 all pcm,s are shipped with out software >>and >>it has to progammed by vin >>now more salvage yard pcm swapping > > ^^^^^^^ > > One letter... how it changes things. > Tim probably meant 'no'... > __ > Steve > . > > > > > >>reigelser wrote: >> >> >>>Hi, >>>does anybody know, if there is some programming or calibration to be >>>done if >>>the engine control unit is replaced? Or do I just plug it in and thats >>>it? >>>Thanks for the advice. >>> >>>Jo >> > > -- Jerry Bransford PP-ASEL N6TAY See the Geezer Jeep at http://members.cox.net/jerrypb/ |
Re: ECU for Jeep Cherokee
The TJ's ECU is known to be extremely reliable and just about
trouble-free. Have you already replaced the TPS and cleaned/reseated the electrical connection that connects the ECU to the TPS? Bad TPSs are easily replaced and far cheaper than replacing the ECU. Jerry reigelser wrote: > I need the ECU eventually because of a persistent TPS error. My mechanic > troubleshooted it and thinks its probably the ECU. But he thinks there has > to be some reprogramming to be done, because I tried one from the junk yard > before he looked into it and nothing changed (same TPS error, same mileage). > It's a 97 inline 6 Cherokee. It works, but it doesn't start at first try and > it is not very smooth if you want to accelerate from 65 to 75 without a > kickdown. > > "Stephen Cowell" <scowell@sbcglobal.net> wrote in message > news:JQXqe.18$kX4.14@newssvr30.news.prodigy.com... > > "tim bur" <dbrider@cac.net> wrote in message > news:42ABA761.F70549FF@cac.net... > >>depends on the year starting in 04 all pcm,s are shipped with out software >>and >>it has to progammed by vin >>now more salvage yard pcm swapping > > ^^^^^^^ > > One letter... how it changes things. > Tim probably meant 'no'... > __ > Steve > . > > > > > >>reigelser wrote: >> >> >>>Hi, >>>does anybody know, if there is some programming or calibration to be >>>done if >>>the engine control unit is replaced? Or do I just plug it in and thats >>>it? >>>Thanks for the advice. >>> >>>Jo >> > > -- Jerry Bransford PP-ASEL N6TAY See the Geezer Jeep at http://members.cox.net/jerrypb/ |
Re: ECU for Jeep Cherokee
The TJ's ECU is known to be extremely reliable and just about
trouble-free. Have you already replaced the TPS and cleaned/reseated the electrical connection that connects the ECU to the TPS? Bad TPSs are easily replaced and far cheaper than replacing the ECU. Jerry reigelser wrote: > I need the ECU eventually because of a persistent TPS error. My mechanic > troubleshooted it and thinks its probably the ECU. But he thinks there has > to be some reprogramming to be done, because I tried one from the junk yard > before he looked into it and nothing changed (same TPS error, same mileage). > It's a 97 inline 6 Cherokee. It works, but it doesn't start at first try and > it is not very smooth if you want to accelerate from 65 to 75 without a > kickdown. > > "Stephen Cowell" <scowell@sbcglobal.net> wrote in message > news:JQXqe.18$kX4.14@newssvr30.news.prodigy.com... > > "tim bur" <dbrider@cac.net> wrote in message > news:42ABA761.F70549FF@cac.net... > >>depends on the year starting in 04 all pcm,s are shipped with out software >>and >>it has to progammed by vin >>now more salvage yard pcm swapping > > ^^^^^^^ > > One letter... how it changes things. > Tim probably meant 'no'... > __ > Steve > . > > > > > >>reigelser wrote: >> >> >>>Hi, >>>does anybody know, if there is some programming or calibration to be >>>done if >>>the engine control unit is replaced? Or do I just plug it in and thats >>>it? >>>Thanks for the advice. >>> >>>Jo >> > > -- Jerry Bransford PP-ASEL N6TAY See the Geezer Jeep at http://members.cox.net/jerrypb/ |
Re: ECU for Jeep Cherokee
I replaced it allready and all voltages are fine in all ranges of motion of
the TPS. I also tried to disable other parts of the electric system to see if there is an effect on the tps circuit, without success. The error won't clear and there is still an effect on the driving behavior. "Jerry Bransford" <jerrypb@cox.net> wrote in message news:kAore.88$X71.85@fed1read07... > The TJ's ECU is known to be extremely reliable and just about > trouble-free. Have you already replaced the TPS and cleaned/reseated the > electrical connection that connects the ECU to the TPS? Bad TPSs are > easily replaced and far cheaper than replacing the ECU. > > Jerry > > reigelser wrote: >> I need the ECU eventually because of a persistent TPS error. My mechanic >> troubleshooted it and thinks its probably the ECU. But he thinks there >> has to be some reprogramming to be done, because I tried one from the >> junk yard before he looked into it and nothing changed (same TPS error, >> same mileage). It's a 97 inline 6 Cherokee. It works, but it doesn't >> start at first try and it is not very smooth if you want to accelerate >> from 65 to 75 without a kickdown. >> >> "Stephen Cowell" <scowell@sbcglobal.net> wrote in message >> news:JQXqe.18$kX4.14@newssvr30.news.prodigy.com... >> >> "tim bur" <dbrider@cac.net> wrote in message >> news:42ABA761.F70549FF@cac.net... >> >>>depends on the year starting in 04 all pcm,s are shipped with out >>>software and >>>it has to progammed by vin >>>now more salvage yard pcm swapping >> >> ^^^^^^^ >> >> One letter... how it changes things. >> Tim probably meant 'no'... >> __ >> Steve >> . >> >> >> >> >> >>>reigelser wrote: >>> >>> >>>>Hi, >>>>does anybody know, if there is some programming or calibration to be >>>>done if >>>>the engine control unit is replaced? Or do I just plug it in and thats >>>>it? >>>>Thanks for the advice. >>>> >>>>Jo >>> >> >> > > -- > Jerry Bransford > PP-ASEL N6TAY > See the Geezer Jeep at > http://members.cox.net/jerrypb/ |
Re: ECU for Jeep Cherokee
I replaced it allready and all voltages are fine in all ranges of motion of
the TPS. I also tried to disable other parts of the electric system to see if there is an effect on the tps circuit, without success. The error won't clear and there is still an effect on the driving behavior. "Jerry Bransford" <jerrypb@cox.net> wrote in message news:kAore.88$X71.85@fed1read07... > The TJ's ECU is known to be extremely reliable and just about > trouble-free. Have you already replaced the TPS and cleaned/reseated the > electrical connection that connects the ECU to the TPS? Bad TPSs are > easily replaced and far cheaper than replacing the ECU. > > Jerry > > reigelser wrote: >> I need the ECU eventually because of a persistent TPS error. My mechanic >> troubleshooted it and thinks its probably the ECU. But he thinks there >> has to be some reprogramming to be done, because I tried one from the >> junk yard before he looked into it and nothing changed (same TPS error, >> same mileage). It's a 97 inline 6 Cherokee. It works, but it doesn't >> start at first try and it is not very smooth if you want to accelerate >> from 65 to 75 without a kickdown. >> >> "Stephen Cowell" <scowell@sbcglobal.net> wrote in message >> news:JQXqe.18$kX4.14@newssvr30.news.prodigy.com... >> >> "tim bur" <dbrider@cac.net> wrote in message >> news:42ABA761.F70549FF@cac.net... >> >>>depends on the year starting in 04 all pcm,s are shipped with out >>>software and >>>it has to progammed by vin >>>now more salvage yard pcm swapping >> >> ^^^^^^^ >> >> One letter... how it changes things. >> Tim probably meant 'no'... >> __ >> Steve >> . >> >> >> >> >> >>>reigelser wrote: >>> >>> >>>>Hi, >>>>does anybody know, if there is some programming or calibration to be >>>>done if >>>>the engine control unit is replaced? Or do I just plug it in and thats >>>>it? >>>>Thanks for the advice. >>>> >>>>Jo >>> >> >> > > -- > Jerry Bransford > PP-ASEL N6TAY > See the Geezer Jeep at > http://members.cox.net/jerrypb/ |
Re: ECU for Jeep Cherokee
I replaced it allready and all voltages are fine in all ranges of motion of
the TPS. I also tried to disable other parts of the electric system to see if there is an effect on the tps circuit, without success. The error won't clear and there is still an effect on the driving behavior. "Jerry Bransford" <jerrypb@cox.net> wrote in message news:kAore.88$X71.85@fed1read07... > The TJ's ECU is known to be extremely reliable and just about > trouble-free. Have you already replaced the TPS and cleaned/reseated the > electrical connection that connects the ECU to the TPS? Bad TPSs are > easily replaced and far cheaper than replacing the ECU. > > Jerry > > reigelser wrote: >> I need the ECU eventually because of a persistent TPS error. My mechanic >> troubleshooted it and thinks its probably the ECU. But he thinks there >> has to be some reprogramming to be done, because I tried one from the >> junk yard before he looked into it and nothing changed (same TPS error, >> same mileage). It's a 97 inline 6 Cherokee. It works, but it doesn't >> start at first try and it is not very smooth if you want to accelerate >> from 65 to 75 without a kickdown. >> >> "Stephen Cowell" <scowell@sbcglobal.net> wrote in message >> news:JQXqe.18$kX4.14@newssvr30.news.prodigy.com... >> >> "tim bur" <dbrider@cac.net> wrote in message >> news:42ABA761.F70549FF@cac.net... >> >>>depends on the year starting in 04 all pcm,s are shipped with out >>>software and >>>it has to progammed by vin >>>now more salvage yard pcm swapping >> >> ^^^^^^^ >> >> One letter... how it changes things. >> Tim probably meant 'no'... >> __ >> Steve >> . >> >> >> >> >> >>>reigelser wrote: >>> >>> >>>>Hi, >>>>does anybody know, if there is some programming or calibration to be >>>>done if >>>>the engine control unit is replaced? Or do I just plug it in and thats >>>>it? >>>>Thanks for the advice. >>>> >>>>Jo >>> >> >> > > -- > Jerry Bransford > PP-ASEL N6TAY > See the Geezer Jeep at > http://members.cox.net/jerrypb/ |
Re: ECU for Jeep Cherokee
I replaced it allready and all voltages are fine in all ranges of motion of
the TPS. I also tried to disable other parts of the electric system to see if there is an effect on the tps circuit, without success. The error won't clear and there is still an effect on the driving behavior. "Jerry Bransford" <jerrypb@cox.net> wrote in message news:kAore.88$X71.85@fed1read07... > The TJ's ECU is known to be extremely reliable and just about > trouble-free. Have you already replaced the TPS and cleaned/reseated the > electrical connection that connects the ECU to the TPS? Bad TPSs are > easily replaced and far cheaper than replacing the ECU. > > Jerry > > reigelser wrote: >> I need the ECU eventually because of a persistent TPS error. My mechanic >> troubleshooted it and thinks its probably the ECU. But he thinks there >> has to be some reprogramming to be done, because I tried one from the >> junk yard before he looked into it and nothing changed (same TPS error, >> same mileage). It's a 97 inline 6 Cherokee. It works, but it doesn't >> start at first try and it is not very smooth if you want to accelerate >> from 65 to 75 without a kickdown. >> >> "Stephen Cowell" <scowell@sbcglobal.net> wrote in message >> news:JQXqe.18$kX4.14@newssvr30.news.prodigy.com... >> >> "tim bur" <dbrider@cac.net> wrote in message >> news:42ABA761.F70549FF@cac.net... >> >>>depends on the year starting in 04 all pcm,s are shipped with out >>>software and >>>it has to progammed by vin >>>now more salvage yard pcm swapping >> >> ^^^^^^^ >> >> One letter... how it changes things. >> Tim probably meant 'no'... >> __ >> Steve >> . >> >> >> >> >> >>>reigelser wrote: >>> >>> >>>>Hi, >>>>does anybody know, if there is some programming or calibration to be >>>>done if >>>>the engine control unit is replaced? Or do I just plug it in and thats >>>>it? >>>>Thanks for the advice. >>>> >>>>Jo >>> >> >> > > -- > Jerry Bransford > PP-ASEL N6TAY > See the Geezer Jeep at > http://members.cox.net/jerrypb/ |
Re: ECU for Jeep Cherokee
"reigelser" <reigelser@sbcglobal.net> wrote in message news:m7ore.757$aa2.19@newssvr17.news.prodigy.com.. . > I need the ECU eventually because of a persistent TPS error. My mechanic > troubleshooted it and thinks its probably the ECU. But he thinks there has > to be some reprogramming to be done, because I tried one from the junk yard > before he looked into it and nothing changed (same TPS error, same mileage). > It's a 97 inline 6 Cherokee. It works, but it doesn't start at first try and > it is not very smooth if you want to accelerate from 65 to 75 without a > kickdown. So it only throws a 24 code? Do you have a manual or automatic transmission? Any aftermarket parts on the engine? It's never thrown a 15 (VSS)? That causes kickdown problems too... With the TPS, you can actually patch a digital voltmeter in and watch the voltage as you drive... won't hurt a thing. If the computer's bad, then you'd expect the +V to the TPS to fluctuate... if the TPS is bad, you'd expect the wiper return voltage to be wrong for the rpm, gear, etc. That's what I'd do next... __ Steve .. |
Re: ECU for Jeep Cherokee
"reigelser" <reigelser@sbcglobal.net> wrote in message news:m7ore.757$aa2.19@newssvr17.news.prodigy.com.. . > I need the ECU eventually because of a persistent TPS error. My mechanic > troubleshooted it and thinks its probably the ECU. But he thinks there has > to be some reprogramming to be done, because I tried one from the junk yard > before he looked into it and nothing changed (same TPS error, same mileage). > It's a 97 inline 6 Cherokee. It works, but it doesn't start at first try and > it is not very smooth if you want to accelerate from 65 to 75 without a > kickdown. So it only throws a 24 code? Do you have a manual or automatic transmission? Any aftermarket parts on the engine? It's never thrown a 15 (VSS)? That causes kickdown problems too... With the TPS, you can actually patch a digital voltmeter in and watch the voltage as you drive... won't hurt a thing. If the computer's bad, then you'd expect the +V to the TPS to fluctuate... if the TPS is bad, you'd expect the wiper return voltage to be wrong for the rpm, gear, etc. That's what I'd do next... __ Steve .. |
Re: ECU for Jeep Cherokee
"reigelser" <reigelser@sbcglobal.net> wrote in message news:m7ore.757$aa2.19@newssvr17.news.prodigy.com.. . > I need the ECU eventually because of a persistent TPS error. My mechanic > troubleshooted it and thinks its probably the ECU. But he thinks there has > to be some reprogramming to be done, because I tried one from the junk yard > before he looked into it and nothing changed (same TPS error, same mileage). > It's a 97 inline 6 Cherokee. It works, but it doesn't start at first try and > it is not very smooth if you want to accelerate from 65 to 75 without a > kickdown. So it only throws a 24 code? Do you have a manual or automatic transmission? Any aftermarket parts on the engine? It's never thrown a 15 (VSS)? That causes kickdown problems too... With the TPS, you can actually patch a digital voltmeter in and watch the voltage as you drive... won't hurt a thing. If the computer's bad, then you'd expect the +V to the TPS to fluctuate... if the TPS is bad, you'd expect the wiper return voltage to be wrong for the rpm, gear, etc. That's what I'd do next... __ Steve .. |
Re: ECU for Jeep Cherokee
"reigelser" <reigelser@sbcglobal.net> wrote in message news:m7ore.757$aa2.19@newssvr17.news.prodigy.com.. . > I need the ECU eventually because of a persistent TPS error. My mechanic > troubleshooted it and thinks its probably the ECU. But he thinks there has > to be some reprogramming to be done, because I tried one from the junk yard > before he looked into it and nothing changed (same TPS error, same mileage). > It's a 97 inline 6 Cherokee. It works, but it doesn't start at first try and > it is not very smooth if you want to accelerate from 65 to 75 without a > kickdown. So it only throws a 24 code? Do you have a manual or automatic transmission? Any aftermarket parts on the engine? It's never thrown a 15 (VSS)? That causes kickdown problems too... With the TPS, you can actually patch a digital voltmeter in and watch the voltage as you drive... won't hurt a thing. If the computer's bad, then you'd expect the +V to the TPS to fluctuate... if the TPS is bad, you'd expect the wiper return voltage to be wrong for the rpm, gear, etc. That's what I'd do next... __ Steve .. |
Re: ECU for Jeep Cherokee
It is an automatic transmission. What is the wiper return voltage? The other
voltage I can measure on the TPS besides the ~200mV to ~4V? I check the message with an OBD Reader. P0123 I think is the number or P0124, don't remember right now. Are you referring to the Check Engine Light flashing when you mension a 24 and a 15? "Stephen Cowell" <scowell@sbcglobal.net> wrote in message news:22pre.430$kX4.116@newssvr30.news.prodigy.com. .. "reigelser" <reigelser@sbcglobal.net> wrote in message news:m7ore.757$aa2.19@newssvr17.news.prodigy.com.. . > I need the ECU eventually because of a persistent TPS error. My mechanic > troubleshooted it and thinks its probably the ECU. But he thinks there has > to be some reprogramming to be done, because I tried one from the junk > yard > before he looked into it and nothing changed (same TPS error, same > mileage). > It's a 97 inline 6 Cherokee. It works, but it doesn't start at first try > and > it is not very smooth if you want to accelerate from 65 to 75 without a > kickdown. So it only throws a 24 code? Do you have a manual or automatic transmission? Any aftermarket parts on the engine? It's never thrown a 15 (VSS)? That causes kickdown problems too... With the TPS, you can actually patch a digital voltmeter in and watch the voltage as you drive... won't hurt a thing. If the computer's bad, then you'd expect the +V to the TPS to fluctuate... if the TPS is bad, you'd expect the wiper return voltage to be wrong for the rpm, gear, etc. That's what I'd do next... __ Steve .. |
Re: ECU for Jeep Cherokee
It is an automatic transmission. What is the wiper return voltage? The other
voltage I can measure on the TPS besides the ~200mV to ~4V? I check the message with an OBD Reader. P0123 I think is the number or P0124, don't remember right now. Are you referring to the Check Engine Light flashing when you mension a 24 and a 15? "Stephen Cowell" <scowell@sbcglobal.net> wrote in message news:22pre.430$kX4.116@newssvr30.news.prodigy.com. .. "reigelser" <reigelser@sbcglobal.net> wrote in message news:m7ore.757$aa2.19@newssvr17.news.prodigy.com.. . > I need the ECU eventually because of a persistent TPS error. My mechanic > troubleshooted it and thinks its probably the ECU. But he thinks there has > to be some reprogramming to be done, because I tried one from the junk > yard > before he looked into it and nothing changed (same TPS error, same > mileage). > It's a 97 inline 6 Cherokee. It works, but it doesn't start at first try > and > it is not very smooth if you want to accelerate from 65 to 75 without a > kickdown. So it only throws a 24 code? Do you have a manual or automatic transmission? Any aftermarket parts on the engine? It's never thrown a 15 (VSS)? That causes kickdown problems too... With the TPS, you can actually patch a digital voltmeter in and watch the voltage as you drive... won't hurt a thing. If the computer's bad, then you'd expect the +V to the TPS to fluctuate... if the TPS is bad, you'd expect the wiper return voltage to be wrong for the rpm, gear, etc. That's what I'd do next... __ Steve .. |
Re: ECU for Jeep Cherokee
It is an automatic transmission. What is the wiper return voltage? The other
voltage I can measure on the TPS besides the ~200mV to ~4V? I check the message with an OBD Reader. P0123 I think is the number or P0124, don't remember right now. Are you referring to the Check Engine Light flashing when you mension a 24 and a 15? "Stephen Cowell" <scowell@sbcglobal.net> wrote in message news:22pre.430$kX4.116@newssvr30.news.prodigy.com. .. "reigelser" <reigelser@sbcglobal.net> wrote in message news:m7ore.757$aa2.19@newssvr17.news.prodigy.com.. . > I need the ECU eventually because of a persistent TPS error. My mechanic > troubleshooted it and thinks its probably the ECU. But he thinks there has > to be some reprogramming to be done, because I tried one from the junk > yard > before he looked into it and nothing changed (same TPS error, same > mileage). > It's a 97 inline 6 Cherokee. It works, but it doesn't start at first try > and > it is not very smooth if you want to accelerate from 65 to 75 without a > kickdown. So it only throws a 24 code? Do you have a manual or automatic transmission? Any aftermarket parts on the engine? It's never thrown a 15 (VSS)? That causes kickdown problems too... With the TPS, you can actually patch a digital voltmeter in and watch the voltage as you drive... won't hurt a thing. If the computer's bad, then you'd expect the +V to the TPS to fluctuate... if the TPS is bad, you'd expect the wiper return voltage to be wrong for the rpm, gear, etc. That's what I'd do next... __ Steve .. |
Re: ECU for Jeep Cherokee
It is an automatic transmission. What is the wiper return voltage? The other
voltage I can measure on the TPS besides the ~200mV to ~4V? I check the message with an OBD Reader. P0123 I think is the number or P0124, don't remember right now. Are you referring to the Check Engine Light flashing when you mension a 24 and a 15? "Stephen Cowell" <scowell@sbcglobal.net> wrote in message news:22pre.430$kX4.116@newssvr30.news.prodigy.com. .. "reigelser" <reigelser@sbcglobal.net> wrote in message news:m7ore.757$aa2.19@newssvr17.news.prodigy.com.. . > I need the ECU eventually because of a persistent TPS error. My mechanic > troubleshooted it and thinks its probably the ECU. But he thinks there has > to be some reprogramming to be done, because I tried one from the junk > yard > before he looked into it and nothing changed (same TPS error, same > mileage). > It's a 97 inline 6 Cherokee. It works, but it doesn't start at first try > and > it is not very smooth if you want to accelerate from 65 to 75 without a > kickdown. So it only throws a 24 code? Do you have a manual or automatic transmission? Any aftermarket parts on the engine? It's never thrown a 15 (VSS)? That causes kickdown problems too... With the TPS, you can actually patch a digital voltmeter in and watch the voltage as you drive... won't hurt a thing. If the computer's bad, then you'd expect the +V to the TPS to fluctuate... if the TPS is bad, you'd expect the wiper return voltage to be wrong for the rpm, gear, etc. That's what I'd do next... __ Steve .. |
Re: ECU for Jeep Cherokee
reigelser did pass the time by typing:
> I need the ECU eventually because of a persistent TPS error. My mechanic > troubleshooted it and thinks its probably the ECU. But he thinks there has > to be some reprogramming to be done, because I tried one from the junk yard > before he looked into it and nothing changed (same TPS error, same mileage). > It's a 97 inline 6 Cherokee. It works, but it doesn't start at first try and > it is not very smooth if you want to accelerate from 65 to 75 without a > kickdown. Clean the connectors at both the TPS and the ECU. And while you have the plugs off, ohm out the sensor lines as the TPS shares a common ground link with other sensors and that link can go wonky. All I have is the 93 schematic so you need the color codes for your year. -- DougW |
Re: ECU for Jeep Cherokee
reigelser did pass the time by typing:
> I need the ECU eventually because of a persistent TPS error. My mechanic > troubleshooted it and thinks its probably the ECU. But he thinks there has > to be some reprogramming to be done, because I tried one from the junk yard > before he looked into it and nothing changed (same TPS error, same mileage). > It's a 97 inline 6 Cherokee. It works, but it doesn't start at first try and > it is not very smooth if you want to accelerate from 65 to 75 without a > kickdown. Clean the connectors at both the TPS and the ECU. And while you have the plugs off, ohm out the sensor lines as the TPS shares a common ground link with other sensors and that link can go wonky. All I have is the 93 schematic so you need the color codes for your year. -- DougW |
Re: ECU for Jeep Cherokee
reigelser did pass the time by typing:
> I need the ECU eventually because of a persistent TPS error. My mechanic > troubleshooted it and thinks its probably the ECU. But he thinks there has > to be some reprogramming to be done, because I tried one from the junk yard > before he looked into it and nothing changed (same TPS error, same mileage). > It's a 97 inline 6 Cherokee. It works, but it doesn't start at first try and > it is not very smooth if you want to accelerate from 65 to 75 without a > kickdown. Clean the connectors at both the TPS and the ECU. And while you have the plugs off, ohm out the sensor lines as the TPS shares a common ground link with other sensors and that link can go wonky. All I have is the 93 schematic so you need the color codes for your year. -- DougW |
Re: ECU for Jeep Cherokee
reigelser did pass the time by typing:
> I need the ECU eventually because of a persistent TPS error. My mechanic > troubleshooted it and thinks its probably the ECU. But he thinks there has > to be some reprogramming to be done, because I tried one from the junk yard > before he looked into it and nothing changed (same TPS error, same mileage). > It's a 97 inline 6 Cherokee. It works, but it doesn't start at first try and > it is not very smooth if you want to accelerate from 65 to 75 without a > kickdown. Clean the connectors at both the TPS and the ECU. And while you have the plugs off, ohm out the sensor lines as the TPS shares a common ground link with other sensors and that link can go wonky. All I have is the 93 schematic so you need the color codes for your year. -- DougW |
Re: ECU for Jeep Cherokee
"reigelser" <reigelser@sbcglobal.net> wrote in message news:Dipre.429$on5.195@newssvr19.news.prodigy.com. .. > It is an automatic transmission. What is the wiper return voltage? The other > voltage I can measure on the TPS besides the ~200mV to ~4V? > I check the message with an OBD Reader. P0123 I think is the number or > P0124, don't remember right now. Are you referring to the Check Engine Light > flashing when you mension a 24 and a 15? Yes... too cheap to get the OBD. '124' would correspond to the '24'... TPS. Start thinking about things like the ground wire between the engine and the firewall.. this is a known problem point. Doug has the right idea... make sure all connections are clean and tight. Problem starting... to start an EFI vehicle, you should keep your foot *off* the gas until the vehicle has started... no need to touch the gas until you take off. You're doing this, right? Has other maintenance been done recently? Does the engine run smooth once it starts? Describe what you have to do to get it to start (i.e. grind long, grind twice, feather throttle, etc.). The TPS is basically a potentiometer, with three wires going to it... supply, wiper, and ground. The supply is a regulated voltage, sent by the computer and used by the computer as a reference. If this is moving around, the computer may have unfixable problems (blown regulator pass transistor, etc.) or another sensor or connection may be screwing up your TPS reading. The wiper voltage is the one that changes as the throttle plate opens and closes... it should track the position of the gas pedal steadily. The wiper carries your 200mV to 4V. __ Steve .. |
Re: ECU for Jeep Cherokee
"reigelser" <reigelser@sbcglobal.net> wrote in message news:Dipre.429$on5.195@newssvr19.news.prodigy.com. .. > It is an automatic transmission. What is the wiper return voltage? The other > voltage I can measure on the TPS besides the ~200mV to ~4V? > I check the message with an OBD Reader. P0123 I think is the number or > P0124, don't remember right now. Are you referring to the Check Engine Light > flashing when you mension a 24 and a 15? Yes... too cheap to get the OBD. '124' would correspond to the '24'... TPS. Start thinking about things like the ground wire between the engine and the firewall.. this is a known problem point. Doug has the right idea... make sure all connections are clean and tight. Problem starting... to start an EFI vehicle, you should keep your foot *off* the gas until the vehicle has started... no need to touch the gas until you take off. You're doing this, right? Has other maintenance been done recently? Does the engine run smooth once it starts? Describe what you have to do to get it to start (i.e. grind long, grind twice, feather throttle, etc.). The TPS is basically a potentiometer, with three wires going to it... supply, wiper, and ground. The supply is a regulated voltage, sent by the computer and used by the computer as a reference. If this is moving around, the computer may have unfixable problems (blown regulator pass transistor, etc.) or another sensor or connection may be screwing up your TPS reading. The wiper voltage is the one that changes as the throttle plate opens and closes... it should track the position of the gas pedal steadily. The wiper carries your 200mV to 4V. __ Steve .. |
Re: ECU for Jeep Cherokee
"reigelser" <reigelser@sbcglobal.net> wrote in message news:Dipre.429$on5.195@newssvr19.news.prodigy.com. .. > It is an automatic transmission. What is the wiper return voltage? The other > voltage I can measure on the TPS besides the ~200mV to ~4V? > I check the message with an OBD Reader. P0123 I think is the number or > P0124, don't remember right now. Are you referring to the Check Engine Light > flashing when you mension a 24 and a 15? Yes... too cheap to get the OBD. '124' would correspond to the '24'... TPS. Start thinking about things like the ground wire between the engine and the firewall.. this is a known problem point. Doug has the right idea... make sure all connections are clean and tight. Problem starting... to start an EFI vehicle, you should keep your foot *off* the gas until the vehicle has started... no need to touch the gas until you take off. You're doing this, right? Has other maintenance been done recently? Does the engine run smooth once it starts? Describe what you have to do to get it to start (i.e. grind long, grind twice, feather throttle, etc.). The TPS is basically a potentiometer, with three wires going to it... supply, wiper, and ground. The supply is a regulated voltage, sent by the computer and used by the computer as a reference. If this is moving around, the computer may have unfixable problems (blown regulator pass transistor, etc.) or another sensor or connection may be screwing up your TPS reading. The wiper voltage is the one that changes as the throttle plate opens and closes... it should track the position of the gas pedal steadily. The wiper carries your 200mV to 4V. __ Steve .. |
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