2003 V8 ECU Pinout schematic

[Nathana92]

Does anyone have an ECU Pinout schematic for the 2003 4runner V8? I'm trying to wire a tuner and can't seem to find one.

 

[CXS]

Is this what you're looking for?

MAPECU Wiring Diagrams Audi, BMW, Ford, Honda, Lexus, Nissan, Toyota : Performance Motor Research

 

[ebg18t]

I might have it in the manual. But I am outa town till Next week. If you still don't have it by then let me know.

 

[BlackWorksInc]

Unfortunately Toyota seems to have changed the way the wiring diagrams work, they don't seem to show the connectors like they used to in some of their older EWDs.

So the best I can do is provide you with the Connector List & ECM Wiring Diagram for the '03 2UZ-FE and you'll have to parse through it to determine what you need.

Connector List-
View attachment Connector_List.pdf
2003 4Runner 2UZ-FE Powertrain EWD (Electrical Wiring Diagram)-
View attachment 017ECS-2UZFE_1.pdf

Post Note-
What supercharger are you running with your vehicle and did you reinforce the engine or are you just doing a bolt-on?

 

[Nathana92]

Is this what you're looking for?

MAPECU Wiring Diagrams Audi, BMW, Ford, Honda, Lexus, Nissan, Toyota : Performance Motor Research

Unfortunately no that's the website of the tuner I purchased and they only have the Landcruiser listed for the wiring.

 

[Nathana92]

Unfortunately Toyota seems to have changed the way the wiring diagrams work, they don't seem to show the connectors like they used to in some of their older EWDs.



So the best I can do is provide you with the Connector List & ECM Wiring Diagram for the '03 2UZ-FE and you'll have to parse through it to determine what you need.



Connector List-

View attachment 118215

2003 4Runner 2UZ-FE Powertrain EWD (Electrical Wiring Diagram)-

View attachment 118214



Post Note-

What supercharger are you running with your vehicle and did you reinforce the engine or are you just doing a bolt-on?

Thanks I was hoping that wasn't the case as I've been sifting through that stuff and it's not an easy read. I'm running the TRD supercharger and mapECU3 piggyback. No I'm not planning on doing any engine internals as the 4R's supposedly have forged rods and are stronger than the tundras and if I blow up the motor I'll put another $700 motor in.

 

[SkylineGTRracer]

Thanks I was hoping that wasn't the case as I've been sifting through that stuff and it's not an easy read. I'm running the TRD supercharger and mapECU3 piggyback. No I'm not planning on doing any engine internals as the 4R's supposedly have forged rods and are stronger than the tundras and if I blow up the motor I'll put another $700 motor in.

Just fyi the 2uz in the 4runner is just as weak as the tundra's.
Lexus 1UZFE, 2UZFE and 3UZFE rod

 

[Nathana92]

Just fyi the 2uz in the 4runner is just as weak as the tundra's.

Lexus 1UZFE, 2UZFE and 3UZFE rod

Well that's just great.

 

[SkylineGTRracer]

speaking of tuning can you see if a trd reflash is still available and run that until you can run a standalone? It might come down to where it is a revised "trd reflash" to the 90l for the 1gr where you basically cant do a burn out. (when the throttle and brake pedal are both pressed the throttle is cut, its the recall bs) Also there was also a tsb out for that supercharger to limit boost (4 psi?) to avoid a nice engine rebuild.

 

[BlackWorksInc]

Just fyi the 2uz in the 4runner is just as weak as the tundra's.
Lexus 1UZFE, 2UZFE and 3UZFE rod

Yeah, unfortunately I still haven't really found any evidence to support the belief that the US made 2UZ-FE Connecting Rods are inherently weaker than their Japanese counter-parts. It is a possibility as Toyota does consolidate part numbers for their various production lines (an excuse given to me by an FSM to explain why the 1GR-FE Headgaskets have a new updated part number coincidentally at about the boundary year where many pre-mature headgasket failures seem to occur prior to said year...), but I have yet to find any real evidence.

I believe the reality is that the supercharger kits weren't as heavily applied to the Land Cruisers and 4Runners as they were the Tundras and thus this rumor was started mainly because the latter vehicles are Japanese Built and the Tundra is US built and that was coincidence enough; rather than the more obvious fact that the Tundras were being used more for towing and heavy load applications with the supercharger kit more than the LC and 4Runners ever were as they were not dealer installed options like the Tundra.

 

[Stuck CAPS]

Have you been speaking to [MENTION=750]Gadget[/MENTION] about it at all? He's currently got the UCON EMS for sale as a stand alone unit for the 1GR, and he may be able to shed light on whether or not its just a matter of wiring and reflash, because it is a self tuning unit. Im not sure on if it just gets flashed with software for the engine and then selftuner software, and I really dont know much about it, other than what is said in the description, but talk to him. (Not to mention that this kit regears the exhaust cams) it could work, though!

 

[BlackWorksInc]

Have you been speaking to [MENTION=750]Gadget[/MENTION] about it at all? He's currently got the UCON EMS for sale as a stand alone unit for the 1GR, and he may be able to shed light on whether or not its just a matter of wiring and reflash, because it is a self tuning unit. Im not sure on if it just gets flashed with software for the engine and then selftuner software, and I really dont know much about it, other than what is said in the description, but talk to him. (Not to mention that this kit regears the exhaust cams) it could work, though!

He's running a 2UZ-FE SuperCharger, not the 1GR-FE. opcorn:

 

[Nathana92]

speaking of tuning can you see if a trd reflash is still available and run that until you can run a standalone? It might come down to where it is a revised "trd reflash" to the 90l for the 1gr where you basically cant do a burn out. (when the throttle and brake pedal are both pressed the throttle is cut, its the recall bs) Also there was also a tsb out for that supercharger to limit boost (4 psi?) to avoid a nice engine rebuild.

I'm not too sure about the TRD reflash, never heard of it. Also never heard of the boost limit TSB. I think the issue with these S/C's is that people were not running proper fuel and timing management with the boost. I think once it's properly tuned it should hold up for a long time.

 

[Nathana92]

Have you been speaking to [MENTION=750]Gadget[/MENTION] about it at all? He's currently got the UCON EMS for sale as a stand alone unit for the 1GR, and he may be able to shed light on whether or not its just a matter of wiring and reflash, because it is a self tuning unit. Im not sure on if it just gets flashed with software for the engine and then selftuner software, and I really dont know much about it, other than what is said in the description, but talk to him. (Not to mention that this kit regears the exhaust cams) it could work, though!

I've already purchased a piggy back, thus the reason I need the pinout. The manufacture of the tuner is making a wiring diagram currently. Should be tuned soon.

 

[Stuck CAPS]

So I take it you're driving that golf right now still?

 

[Nathana92]

So I take it you're driving that golf right now still?

For the time being I predominately drive the golf. The 4R is rich through most driving and is only a tad lean at idle. It's fine to drive but I just prefer drive most my miles on the car.

 

[SkylineGTRracer]

I'm not too sure about the TRD reflash, never heard of it. Also never heard of the boost limit TSB. I think the issue with these S/C's is that people were not running proper fuel and timing management with the boost. I think once it's properly tuned it should hold up for a long time.

Back in the day trd implemented a bigger pulley to lower the boost so its less prone to leaning out and less stress. There should be a trd reflash, I would see if beorne or cavender toyota can do it with their database. Or if blackworks is in a good mood and bribe him with some good beer I'm sure he can find this on toyota tis board.

 

[4RunnerAquasport]

Unfortunately Toyota seems to have changed the way the wiring diagrams work, they don't seem to show the connectors like they used to in some of their older EWDs.

So the best I can do is provide you with the Connector List & ECM Wiring Diagram for the '03 2UZ-FE and you'll have to parse through it to determine what you need.

Connector List-
View attachment 118215
2003 4Runner 2UZ-FE Powertrain EWD (Electrical Wiring Diagram)-
View attachment 118214

10 years later and the search function found a good one lol. Thank You!!