Newbie to Viper EMS...

[Lamb]

I'm posting from the United Kingdom, i have a RT10 viper in my shop at the moment fitted with a US supplied AEM EMS.

I have worked on JDM cars using AEM before but have never seen one of these EMS before.

IT is in a sealed Grey box with 4 plugs and from what i can see no serial lead access.

The owner of the car had a previous problem of which he sent the EMS back to the US to be reflashed, now a few months on the engine light is on and he has asked me to take a look at it.

The problem is i cant see any way of doing any diagnostics without being able to hook up to the EMS.

Any help will be much appreciated.

Thanks

R.

[oldford]

Diagnostics is done via the 16-pin OBD2 diagnostic socket.
Download the software from AEM and solder a cable (RS-232).
No chips or whatsoever needed in the cable, goes direct from the RS-232 port in your PC to the OBD2 connector.

[Lamb]

Many thanks!

I have an OBD to USB lead for mapping japanese cars, i'll give that a shot first to see if its comms and if not get the soldering iron out.
Is there by chance a diagram for serial to OBD?

Thanks for your help

Rob

[oldford]

Normal OBD2 cable DOES NOT WORK!
The communication is not on standard pins and they are RS232C, so there's a direct connection to your PC's RS232 port.
I have seen the picture somewhere but can't find it now.
I worked on an engine with a spare wiring loom and soldered the 9-pin PC connector directly to the wiring loom.
If you download the package there's a lot of documentation included.