HELP!?! 5-speed swap Tacoma ECU no power

[Huey.Raine]

Update…

Kinda…

Did some sleuthing through forums and some folks say the center plug contains wiring for the immobilizer but also the fly by wire throttle control. Which would be found on the 01-02 4Runner and 03-04 Tacoma.

If that’s true my Tacoma ECU should have the center plug regardless of the immobilizer issue, so I googled the part number on it. Everything online listed for sale with that part number is listed as a ‘04 2.7 4 cyl Tacoma.

I think I got screwed.

Gonna do more research to verify it before I call the auto parts store I bought it from and raise hell. I’m in NC and bought it online from a store in New Jersey. They said it’s as is no refunds, but they also specifically listed it as a 3.4 5vz ECU. And I even called them and verified over the phone that it was for a 3.4 v6.

89661-04B30

That’s the part number on it. I just noticed it’s also slightly longer than my 4R ECU.

 

[Team_Jake]

Update…

Kinda…

Did some sleuthing through forums and some folks say the center plug contains wiring for the immobilizer but also the fly by wire throttle control. Which would be found on the 01-02 4Runner and 03-04 Tacoma.

If that’s true my Tacoma ECU should have the center plug regardless of the immobilizer issue, so I googled the part number on it. Everything online listed for sale with that part number is listed as a ‘04 2.7 4 cyl Tacoma.

I think I got screwed.

Gonna do more research to verify it before I call the auto parts store I bought it from and raise hell. I’m in NC and bought it online from a store in New Jersey. They said it’s as is no refunds, but they also specifically listed it as a 3.4 5vz ECU. And I even called them and verified over the phone that it was for a 3.4 v6.

89661-04B30

That’s the part number on it. I just noticed it’s also slightly longer than my 4R ECU.

That part number you listed is indeed for the 4-cylinder motor.

Alright we are definitely getting somewhere now. I know that on '99-'00 that center harness plug is for the immobilizer so I assumed it was also the same on '01-'02 4Runners also but it may be different. If it is true that the drive by wire function goes through that center plug, then everything else leads me to believe you actually do not have an immobilizer. Now you just need to get the correct ECU.

 

[Huey.Raine]

That part number you listed is indeed for the 4-cylinder motor.

Alright we are definitely getting somewhere now. I know that on '99-'00 that center harness plug is for the immobilizer so I assumed it was also the same on '01-'02 4Runners also but it may be different. If it is true that the drive by wire function goes through that center plug, then everything else leads me to believe you actually do not have an immobilizer. Now you just need to get the correct ECU.

I’ll call them first thing tomorrow and try to get a refund.

How common is an immobilizer on the 03-04 Tacoma? Can you tell by the vehicle vin number? I’ll have to source one and I’d prefer not to deal with that headache if possible. Or if it’s just a crap shoot I guess I’ll just have to roll the dice.

Thanks for all the help.

 

[phattyduck]

Sucks about the ECU, but at least you have the answer now...

I just checked the diagrams (I'm much more familiar with the earlier ECUs) - some stuff on the plug that does immobilizer functions is non-immobilizer related, so whatever ECU will have items on all 5 plugs on the 01/02's. Throttle control isn't one of them though, but that doesn't really matter in this case.

On the 99/00's, the 5th (center) plug is only occupied on trucks with immobilizer. Learn something new every day!

-Charlie

 

[audiness]

did you ever end up finding the correct ECU for your truck?

 

[Huey.Raine]

did you ever end up finding the correct ECU for your truck?

Still searching. I got a refund on the other one, though. I’ll keep the thread updated once I find a correct ECU. I did order a transmission switch plug, so I can finish up the wiring for the clutch start cancel, cruise and reverse lights.