ECU problems

I am fairly certain I have zapped my computer and was wondering what you guys have used for replacement computers?

thanks

 

toyota tacoma ecm 1999 5vz - Search (bing.com)

for autos its easy to find.....


....but the manuals.....well thats a completely different animal.....

https://www.ebay.com/itm/175626111745?epid=657475367


believe it or not...its the mass air flow sensor type yours uses as to what different years you can use....crazy....

 

The number on your ECM needs to be replaced with the same part number.

The ECM and Engine Harness and sensors are a matched set.

You can change the year if you swap everything then match up the 4th ECM plug that is attached to the cab harness.

you might try a rebuilder but if it is zapped good no core value.

 

https://www.fs1inc.com/toyota-ecm-p...ml?enginesize=460&make=675&model=765&year=132

 

Thats not necessary accurate ....the harnesses only change every few years.....so most everybody has a choice of a couple or three of them.......you just cant go very far forward too many years, and cant go too far back....

Toyota is a little over zealous when assigning part numbers.....the same exact part might have 16 different part numbers attached to it depending on how many different models and many different body sizes and years.....
example my front hubs....there's a left # and a right #, even though they are exactly the same part....



.

There are some ecm programmers....that you send your old ecm in and they send it back just like new....
last I heard It was $200 and some change....and they guarantee it....


https://www.ebay.com/itm/373917443774

 

Yeah I have struck out recently finding an exact part number match on a used computer. Talking to a friend about sending it to a third party to be programmed, said it more than likely can’t be reprogrammed if something is zapped inside. However I have found a couple businesses that sell certified refurbished products with matched vin code that is plug and play. Just seeing if anyone has had luck with either flagship one or module mechanics?

 

I would suggest putting a WTB ad in classifieds here....
because of the rusted frames....and the 'T' bones there's is a fair number of donor trucks that come thru..

ie.....from a couple of days ago .....2001 3rz MT left overs.....

 

I have yet to ever find any wire harnesses that were able to interchanged from different years without lots of repining

You have personal experiences you would love to share then?

 

5vz I have no experience with....but the 3rz and the 2rz's swap fairly easily....
key there is you got to know the different sensor's age's or periods on the subtle changes.
Another words you need an expert on that model.....like Timmy...


Again they dont come up with a new novel harness every single year........even tho it may issued a different part #....

If toyota did a complete remake of all their cars and trucks from scatch every year.....think what mess that would be .....a logistical and manufacturing nightmare ...
And the US is just a fraction of their inventory......

my guess is most of those different ecm's for same year have slight firmware revamps....
just like android devices....still function just fine....

my 3rz did not crash or explode when it was running a 2rz ecm.....from a different year....

 

How do you know the computer is toast? That’s pretty rare.

 

That was next thing I was gonna say .....alot of people swap ecm and still have no change....
these rarely bite it unless they get wet and corrode somehow....

If you pull it, pop off the cover and see the green mess....then it may be finished...
anything else is repairable.

 

I sent 12v on the cam sensor wiring back to the computer in an attempt to check continuity… I’m fairly confident that would ruin a computer

 

So you were trying to troubleshoot something else?

your story, maybe you should start from beginning.....

 

Hmmm. There are ecu repair services out there, if you can tell them what you think is fried they might be able to fix it

 

Got the truck with crank no start issues. Being manual you could push start and it would fire up. I had my scan tool plugged in but was having trouble getting the codes (hadn’t used it in forever) ended up clearing the three out thinking they will come back if they’re important. Replaced the TPS, Crank and Cam sensors and wanted to check continuity on the wiring to make sure it wasn’t a wiring issue. Mistakenly grabbed the positive terminal. Now when I plug into it with my scan tool I have to manually enter the truck (has always pulled itself up and just read the codes). I have good fuel pressure, I have 12v to all three coil packs, I have spark but it’s sporadic and not in a pattern. Timing is in time. My guess is I zapped the computer and it’s confused now.

 

I have no idea if that’d fry the computer, but I was having similar issues not being able to read codes or connect to the ECU. I sourced a used 95-97 5 speed ECM from a generous member on here and that seemed to solve my issues.

 

Scotty mention something about speeding up a ecm reset by using 1 ohm resistor between the battery cables after you pop them off...and let completely drain for like 15/20 minutes after keying on.....

How to Reset the Engine Control Module With No Hassle! - Flagship One Blog (fs1inc.com)

 

Worth a shot maybe but I have already had it unplugged and removed to get the part number and it was out for about a month

 

Specifically which wire of the cam sensor harness did you blast 12 volts to? Some of our ecu systems have an overload protection that will shut down the ecm to protect it. I had a sienna a/c amplifier that had a 12 volt short to a 5 volt reference and the ecu survived.

 

I don’t remember specifically which wire good chance it was both. What did you have to do to remedy that?