Thread: JWT ECU Info

Found out my JWT ECU has bad injector drivers and was wondering is there anything special on the ECU that would prevent me from soldering the daughter board onto a new B14 ECU? Could I solder it onto a P10 ECU? Also can I pull the JWT tune and put it on my calum so I can get her running until I find a replacement?

JWT does not use chips(atleast im pretty sure they dont) like a calum ECU, another FYI if you send the ECU to JWT they can replace the board to another ecu...

JWT uses a daughter board just like all the others, they use a different chip that you need a special programmer for. You can pull the program off using the consult cable, try searching i cant remember the specifics of it but it has been done before.

There is a jumper you have to un-solder in order for the ECU to pull the tune from the daughter board. Just search for Calum's How To on installing a Basic board and i will tell you how to do it.

JWT will retune an ECU that has issues for free. They did it for me. You just have to send them the EPROM chip back after you test out the new tune. It's nice because you get to keep driving your car during the process. Cost like $2 to send the EPROM back.

-G

It's not the daughter board that is bad, the injector driver on 1 and 3 are bad unless that could be the tune?

not sure what you mean..you mean there is an issue with the solder points between the daughter and main board? How'd it happen? Maybe they'll help you out I'd contact them.

Are you sure its the injector drivers and not a wiring or injector fault?

Eliminate that possiblity first, a simple test would be to unbolt the injector rail and tumble the engine and see which injectors are firing, then swap plugs from 2 & 4 onto 1 & 3 injectors, and tumble again this will prove the injectors.

To verify the wiring a DVM would be handy to check continuity from the injector plugs to the ecu harness plug also each injector plug should have 12V constant on one terminal with the ignition on.

It's best to use a small bulb like 5~ 15 W to test this as it puts a load on the circuit, so ground one leg of the bulb and test each plug for the 12v.

I would also test each injector for its resistance, should be about 14 ohms.

The daughter board can be transferred to another of the same type ecu.

So if its B14 another B14, P10 ecu is like the B13 ecus but I think after 93 there was a different ecu in the P10, I am not fully knowledgable about the USDM ecus.

Any electronics repair shop or someone with good soldering skills can transfer the board.

Also there is one jumper that has to be moved on the main ecu board itself this tells the ecu to use the daughterboard instead of the internal rom. Any of the calum installation or nistune installation write ups will apply.

What is a Calum?

Hey Hobbs want to give my JWT ecu a try?

yoshoto, thankyou for your help, it has been verified that it was a bad ECU, two other ECUs will throw fuel from #3 injector but my JWT will not. All the wiring has been checked over along with the injectors. I can get the car running on my stock ECU but it runs like garbage but that is to be expected with over double the size of injectors and a Z32 maf. I have a new B14 ecu on the way so I hope I can get her running soon. Does anyone know the location of the jumper that needs to be changed?