Crown Victoria - OBD CAN bus protocol

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URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=60744
Printed Date: May 01, 2025 at 6:49 AM

Topic: Crown Victoria - OBD CAN bus protocol

Posted By: Ragnerd
Subject: Crown Victoria - OBD CAN bus protocol
Date Posted: August 05, 2005 at 10:01 AM

Hello.

I was just wondering if anyone has any information about which protocol to use when communicating with the on-board diagnostics for a 2005 Crown Victoria.

Thanks!

Replies:

Posted By: Satkunas
Date Posted: August 05, 2005 at 10:25 AM

It's probably J1850 PWM (44kHz).

Posted By: Ragnerd
Date Posted: August 05, 2005 at 2:25 PM

We have already tried using the J1850 protocol, and it works fine with the 2004 and earlier models. Do you have any other suggestions???

Thanks!

Posted By: Satkunas
Date Posted: August 05, 2005 at 3:37 PM

It's probably been changed to CAN. Google turrned up a mention on this vehicle <https://www.roadsafety.com/teen_techspecs.php#> that it's no longer OBD-II. If you can get me a photo of the data plug I can tell you for certain which protocol it uses.

Posted By: Ragnerd
Date Posted: August 11, 2005 at 11:20 AM

Correct. The hardware interface was switched to CAN. Do you have any ideas on the high-level protocol? I'm hoping that the 2005 models still use J1979.

Thanks!

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