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#1
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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 |
#2
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"reigelser" > wrote in message = ... > Hi, > does anybody know, if there is some programming or calibration to be = done if=20 > 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=20 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 .. |
#3
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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 |
#4
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"tim bur" > wrote in message = ... > 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: >=20 > > 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 > |
#5
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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" > wrote in message ... "tim bur" > wrote in message ... > 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 > |
#6
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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" > wrote in message > ... > > "tim bur" > wrote in message > ... > >>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/ |
#7
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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" > 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" > wrote in message >> ... >> >> "tim bur" > wrote in message >> ... >> >>>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/ |
#8
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"reigelser" > wrote in message = .. . > I need the ECU eventually because of a persistent TPS error. My = mechanic=20 > troubleshooted it and thinks its probably the ECU. But he thinks there = has=20 > to be some reprogramming to be done, because I tried one from the junk = yard=20 > before he looked into it and nothing changed (same TPS error, same = mileage).=20 > It's a 97 inline 6 Cherokee. It works, but it doesn't start at first = try and=20 > it is not very smooth if you want to accelerate from 65 to 75 without = a=20 > 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 .. |
#9
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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" > wrote in message . .. "reigelser" > wrote in message .. . > 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 .. |
#10
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i have not seen in any posts giving a dtc for a tps issue
i have seen and replaced many a tps for a glitch in it's range causing all sorts of issues and some serious testing with a drb and a dvom must take place could be there is a couple of things going wrong though??? like the plug wires are shot. carbon on th valve thats causing a highway speed misfire and there was a tsb on new valve springs for this issue and a weak battery h Stephen Cowell wrote: > "reigelser" > wrote in message .. . > > 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 > . |
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