Bad ECM?
in [Toyota Trucks]
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From: Dante on 8 Sep 2006 15:39 Ok... So I posted here a couple of months about about three sensors on my truck being stuck in not ready status. (1996 Toyota Tacoma X-Cab, manual) I've been patient hoping that it's just a drive cycle issue. Well I've gone over 2,000 miles and still no go. They are still "Not ready". I broke down and took it to a mechanic. They said that all of the sensors are testing fine and that it must be a problem with the ECM. He mentioned that the dealership might possibly be able to "re-flash" the computer. Otherwise I would need a new ECM. So I called the dealership and they said that they don't know of any flash update for my vehicle and to bring it in so they can look it up by VIN and see whats going on. They said that if they could flash it that it would cost about $125.00. Well I've looked around and I think I can find a used and tested ECM for about the same price. The problem is that I don't want to order one and find out that it doesn't work because it doesn't match my trucks features exactly. What would you guys do? Any suggestions? HELP! Thanks, Dante
From: Ray O on 8 Sep 2006 16:00 "Dante" <dante(a)xmission.com> wrote in message news:edsh15$h70$1(a)news.xmission.com... > Ok... So I posted here a couple of months about about three sensors on my > truck being stuck in not ready status. (1996 Toyota Tacoma X-Cab, manual) > I've been patient hoping that it's just a drive cycle issue. Well I've > gone over 2,000 miles and still no go. They are still "Not ready". I > broke down and took it to a mechanic. They said that all of the sensors > are testing fine and that it must be a problem with the ECM. He mentioned > that the dealership might possibly be able to "re-flash" the computer. > Otherwise I would need a new ECM. So I called the dealership and they > said that they don't know of any flash update for my vehicle and to bring > it in so they can look it up by VIN and see whats going on. They said > that if they could flash it that it would cost about $125.00. Well I've > looked around and I think I can find a used and tested ECM for about the > same price. The problem is that I don't want to order one and find out > that it doesn't work because it doesn't match my trucks features exactly. > > What would you guys do? Any suggestions? HELP! > > Thanks, > Dante During my time as a district service manager, I encountered exactly ZERO ECM's that were actually bad, and in speaking with the person who was in charge of the facility that tested and repaired ECM's that were returned under warranty, only 1 or 2 ECM's every 2 years or so were actually bad. In other words, it is literally something like a one in a million chance that the ECM is actually bad. In most cases where changing the ECM fixed a problem, it was probably a loose connection between the ECM and the harness, and the process of swapping ECM's cured the problem. My recommendation is that you unplug the ECM, carefully check each connector pin on the wire harness side, and then re-plug the harness into the ECM, and if that does not work, take a look at the factory service manual. Drive cycles are specific to each vehicle so unfortunately, there is no generic drive cycle that will get any OBD II-equipped vehicle in a ready state. To make things more difficult, part of the drive cycle usually includes a specific time period where the vehicle is parked so if you don't park it long enough or too long, then the ECM won't acknowledge that the drive cycle has been completed. The specific drive cycle for your vehicle should be in the factory service manual, which you can access on line at techinfo.toyota.com for $10/day. While you are rootin around in there, the factory service manual will have hints on fixing your problem. IMO,. a $10 investment to peek at the factory service manual is less $$ than buying an ECM that you may or may not need. -- Ray O (correct punctuation to reply)
From: Danny G. on 8 Sep 2006 16:56 "Ray O" <rokigawaATtristarassociatesDOTcom> wrote in message news:b2396$4501cbdb$44a4a10d$11429(a)msgid.meganewsservers.com... > > "Dante" <dante(a)xmission.com> wrote in message news:edsh15$h70$1(a)news.xmission.com... >> Ok... So I posted here a couple of months about about three sensors on my truck being stuck in not ready status. (1996 Toyota >> Tacoma X-Cab, manual) I've been patient hoping that it's just a drive cycle issue. Well I've gone over 2,000 miles and still no >> go. They are still "Not ready". I broke down and took it to a mechanic. They said that all of the sensors are testing fine and >> that it must be a problem with the ECM. He mentioned that the dealership might possibly be able to "re-flash" the computer. >> Otherwise I would need a new ECM. So I called the dealership and they said that they don't know of any flash update for my >> vehicle and to bring it in so they can look it up by VIN and see whats going on. They said that if they could flash it that it >> would cost about $125.00. Well I've looked around and I think I can find a used and tested ECM for about the same price. The >> problem is that I don't want to order one and find out that it doesn't work because it doesn't match my trucks features exactly. >> >> What would you guys do? Any suggestions? HELP! >> >> Thanks, >> Dante > > During my time as a district service manager, I encountered exactly ZERO ECM's that were actually bad, and in speaking with the > person who was in charge of the facility that tested and repaired ECM's that were returned under warranty, only 1 or 2 ECM's every > 2 years or so were actually bad. In other words, it is literally something like a one in a million chance that the ECM is > actually bad. > > In most cases where changing the ECM fixed a problem, it was probably a loose connection between the ECM and the harness, and the > process of swapping ECM's cured the problem. > > My recommendation is that you unplug the ECM, carefully check each connector pin on the wire harness side, and then re-plug the > harness into the ECM, and if that does not work, take a look at the factory service manual. > > Drive cycles are specific to each vehicle so unfortunately, there is no generic drive cycle that will get any OBD II-equipped > vehicle in a ready state. To make things more difficult, part of the drive cycle usually includes a specific time period where > the vehicle is parked so if you don't park it long enough or too long, then the ECM won't acknowledge that the drive cycle has > been completed. The specific drive cycle for your vehicle should be in the factory service manual, which you can access on line > at techinfo.toyota.com for $10/day. While you are rootin around in there, the factory service manual will have hints on fixing > your problem. > > IMO,. a $10 investment to peek at the factory service manual is less $$ than buying an ECM that you may or may not need. > > -- > > Ray O > (correct punctuation to reply) > I think it's a safe bet that everyone who reads this news group will agree with me when I say, FOLLOW RAY'S ADVICE! You could not get better advice in these areas.... Thanks Ray
From: Ray O on 8 Sep 2006 17:09 "Danny G." <dandog(a)pacbell.net> wrote in message news:YNkMg.2459$MF1.1876(a)newssvr25.news.prodigy.net... > > "Ray O" <rokigawaATtristarassociatesDOTcom> wrote in message > news:b2396$4501cbdb$44a4a10d$11429(a)msgid.meganewsservers.com... >> >> "Dante" <dante(a)xmission.com> wrote in message >> news:edsh15$h70$1(a)news.xmission.com... >>> Ok... So I posted here a couple of months about about three sensors on >>> my truck being stuck in not ready status. (1996 Toyota Tacoma X-Cab, >>> manual) I've been patient hoping that it's just a drive cycle issue. >>> Well I've gone over 2,000 miles and still no go. They are still "Not >>> ready". I broke down and took it to a mechanic. They said that all of >>> the sensors are testing fine and that it must be a problem with the ECM. >>> He mentioned that the dealership might possibly be able to "re-flash" >>> the computer. Otherwise I would need a new ECM. So I called the >>> dealership and they said that they don't know of any flash update for my >>> vehicle and to bring it in so they can look it up by VIN and see whats >>> going on. They said that if they could flash it that it would cost >>> about $125.00. Well I've looked around and I think I can find a used >>> and tested ECM for about the same price. The problem is that I don't >>> want to order one and find out that it doesn't work because it doesn't >>> match my trucks features exactly. >>> >>> What would you guys do? Any suggestions? HELP! >>> >>> Thanks, >>> Dante >> >> During my time as a district service manager, I encountered exactly ZERO >> ECM's that were actually bad, and in speaking with the person who was in >> charge of the facility that tested and repaired ECM's that were returned >> under warranty, only 1 or 2 ECM's every 2 years or so were actually bad. >> In other words, it is literally something like a one in a million chance >> that the ECM is actually bad. >> >> In most cases where changing the ECM fixed a problem, it was probably a >> loose connection between the ECM and the harness, and the process of >> swapping ECM's cured the problem. >> >> My recommendation is that you unplug the ECM, carefully check each >> connector pin on the wire harness side, and then re-plug the harness into >> the ECM, and if that does not work, take a look at the factory service >> manual. >> >> Drive cycles are specific to each vehicle so unfortunately, there is no >> generic drive cycle that will get any OBD II-equipped vehicle in a ready >> state. To make things more difficult, part of the drive cycle usually >> includes a specific time period where the vehicle is parked so if you >> don't park it long enough or too long, then the ECM won't acknowledge >> that the drive cycle has been completed. The specific drive cycle for >> your vehicle should be in the factory service manual, which you can >> access on line at techinfo.toyota.com for $10/day. While you are rootin >> around in there, the factory service manual will have hints on fixing >> your problem. >> >> IMO,. a $10 investment to peek at the factory service manual is less $$ >> than buying an ECM that you may or may not need. >> >> -- >> >> Ray O >> (correct punctuation to reply) >> > > I think it's a safe bet that everyone who reads this news group will agree > with me when I say, > FOLLOW RAY'S ADVICE! You could not get better advice in these areas.... > > > Thanks Ray > Thanks for the vote of confidence! Hopefully, the OP will find something other than a bad ECU. -- Ray O (correct punctuation to reply)
From: wenmang@yahoo.com on 8 Sep 2006 17:24 I have a similar problem with my 2001 Corolla. So far, after clearing the code(P0420), 1 month has passed and ODBII reader still shows that CAT cycle has not done yet. I agree with Danny's comment about Ray.
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