ECU changed

Tiny
AHMAD KHALED AL KHALAFAT
  • MEMBER
  • 2007 HYUNDAI COUPE
  • 2.0L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 100,000 MILES
I change the ECU so I need to program the keys. It's easy and I need to bring the or just the ECU and the key can be program without bring the car.
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Wednesday, April 14th, 2021 AT 4:58 PM

6 Replies

Tiny
STEVE W.
  • EXPERT
Whoever you have do the programming will need the entire car because not only the keys need to be programmed but a few of the other modules will need to be programmed to the new ECU and the VIN in the replacement ECU will need to be reset to match the VIN of the car. What was the reason for the ECU change?
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Wednesday, April 14th, 2021 AT 5:11 PM
Tiny
AHMAD KHALED AL KHALAFAT
  • MEMBER
Bad ECU as they told me.
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Wednesday, April 14th, 2021 AT 5:24 PM
Tiny
AHMAD KHALED AL KHALAFAT
  • MEMBER
Two codes appear; p1690 smartra no response and p1691 immobilizer antenna error.
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Wednesday, April 14th, 2021 AT 5:28 PM
Tiny
STEVE W.
  • EXPERT
Both of those are related to the ECU not being coded to the car. They are basically saying that the security system cannot talk to the key and the ECU cannot talk to the immobilizer. That is why you will need a good scan tool that can go in and alter the VIN and then initialize the keys. It may also need the ECU to be updated to make it work properly, that takes a dealer level scan tool with a dealer code.
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Wednesday, April 14th, 2021 AT 5:41 PM
Tiny
KEN L
  • ADMIN
Here are instructions on how to add keys and changing the ECU in the diagrams below.
Check out the diagrams (below). Please let us know if you need anything else to get the problem fixed.
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Thursday, April 15th, 2021 AT 5:21 PM
Tiny
STEVE W.
  • EXPERT
One item to add to the above guides. You need a scan tool that is capable of doing programing on a Hyundai, the factory tool can do that as can a couple of the aftermarket units but you also need the interface and access to Hyundai's programming software.

https://www.hyundaitechinfo.com/ is the site that you use.

It has a listing under programming that shows which J2534 boxes work to set up the ECU. Once it's set up you can deal with the rest of the systems.
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Thursday, April 15th, 2021 AT 9:28 PM

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