New ECU on Mazda 3 - get unable to connect to vehicle

Discussion about adapters and connections - usage, problems, solutions
Post Reply
jeffmcewan
Posts: 2
Joined: Sun Dec 06, 2020 1:17 am
Vehicle: Mazda 3 2.5 2008

New ECU on Mazda 3 - get unable to connect to vehicle

Post by jeffmcewan »

I purchased a new ECU for my Mazda 3 and need to reset the keys to it. I can connect fine to the old ECU, but after installing the new one it won't communicate.
Ecmbuster
Posts: 963
Joined: Sun Mar 15, 2015 4:08 am
Vehicle: Volvo Bertone and two Motorcyles
Location: On a spinning rock

Re: New ECU on Mazda 3 - get unable to connect to vehicle

Post by Ecmbuster »

You need to program the new PCM to the Mazda with a subscription. They come blank.
https://www.mazdaserviceinfo.com/pcm-reflashing
Either a VCM 2 or J2534-2 device is required.
Do not ask for help in PM. Use the forum to ask and answer questions!
jeffmcewan
Posts: 2
Joined: Sun Dec 06, 2020 1:17 am
Vehicle: Mazda 3 2.5 2008

Re: New ECU on Mazda 3 - get unable to connect to vehicle

Post by jeffmcewan »

The ECU was already programmed by the seller with my VIN. I would expect I could program the keys to it.
Ecmbuster
Posts: 963
Joined: Sun Mar 15, 2015 4:08 am
Vehicle: Volvo Bertone and two Motorcyles
Location: On a spinning rock

Re: New ECU on Mazda 3 - get unable to connect to vehicle

Post by Ecmbuster »

Then contact the seller, I'm sure the answer will be quite interesting.
Do not ask for help in PM. Use the forum to ask and answer questions!
Post Reply