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Discussion Starter · #1 ·
All,

I'm a supra guy (don;t hold it against me) but am now getting into the Zs. I bought a 2007 Z (auto trans) at an auction. It needed a TON of work but have finally got things situated aside from the trans. I am kicking myself for buying an auto. It shifts HARD and I assume that is because the previous owner swapped out the transmission and never reprogrammed it.

Here is the deal:
-- Swapped ECU/BCM and ignition set because could not communicate OBD with ECU. So the ECU VIN does not match the transmission.
-- Swapped Transmission valve body - the valve body is from a infinity transmission.

I can get the trans to shift (hard) to 3rd gear and it slips in 3rd so I may have an issue there but my first issue is hard shifting. The trans codes are
P1705 Throttle position Sensor
P1721 Est Vehicle Speed
P0725 Engine Speed Circuit
U1000 CAN

I took it to the Nissan dealer (Hudson Nissan in Charleston SC) and they gave it back to me stating they cannot communicate with the transmission. They are the only dealership in town -freaking nuts.

I bought the Chinese SVCI ING software to see if I could reprogram it and I could not get the tool to communicate with the transmission. I guess this makes sense since the ECU can't communicate with the TCU??

I need some advice on next steps. I'd like to have the ECU VIN match the car VIN but that is not my first issue. I just need the VIN in the TCU to match the ECU for shifting. How the **** do I make this happen?? I'm open to any ideas/suggestion/someone I can talk to/etc.

Thanks,
-Matt H.
1985 Supra
2007 350Z
 

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Welcome Matt- sorry I can't answer your question directly. I've never owned an auto Z33, but can see you've done your homework. It sounds like you've bid on a problem car, and the electronic controls that came with it. Such electronic architecture is complex in making such a switch. My suggestion is to contact a vendor like UpRev.com that offers tools and in-house tuning. They may have some real-world ideas or services that might help in properly reprograming the parts you have.

I wish you luck in completing such a project car- wish I had more concrete ideas to pass on to you.
 

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Discussion Starter · #3 ·
Thanks for the advice. I may go down that road. Good reason not to buy an auto...or an auction car. It looked unmolested but deep down its got major baggage!! Good thing is it was nevetr in a wreck so its not a salvage.
Best,
Matt H.
 
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