Hello Guest, welcome to the initial stages of our new platform!
You can find some additional information about where we are in the process of migrating the board and setting up our new software here
Thank you for being a part of our community!
My new to me 92 740 is a Regina car,and since I haven't started driving it yet would be happy to open it up. I'll send you pics as I don't know what to look for.
You rock!
Thanks so much! Just look at the pictures I posted above and send about the same
Also, from the French Renault forums, I was sent this link: (just use chrome and translate)
http://pquillon.chez-alice.fr/Index/monlabo.htm
Lots of great info on here
Just checked the car,I have the same ecu as yours above
you opened it up and it had the same motorola chip?
I didn't but did just now and the numbers on the chip are different.should I take pics then?
If yes then send me a pm with your contact info as I don't know how to post pics.also should I remove the board from case to see the backside?
I didn't but did just now and the numbers on the chip are different.should I take pics then?
If yes then send me a pm with your contact info as I don't know how to post pics.also should I remove the board from case to see the backside?
Inside the Rex ignition box I got. You wanna adjust your ignition map also?
Is it the ST chip that I need to take out and read? What is that ST chip?
My best guess for the ignition box is:
The ZC98902VP is another custom (mask rom) Motorola processor (VP=automotive rated 28-pin plastic pkg), probably a 6804 or 6805 family due to the smaller pincount (28 versus 40).
Based on the Fenix paper, the STMicro TSG4801AP (?) is a custom digital chip needed to decode the flywheel pattern.
One of the two 8-pin DIP chips might be a small serial PROM or EEPROM, to contain the key ignition map parameters. I'd try tracing the PCB wires between the processor and the 8-pin chips to see if they match up with a serial I2C or SPI interface (say clock, data, chip select).
A couple more useful tidbits:
There's excerpts from a Volvo Greenbook that describe Rex/Regina in detail at:
https://people.ohio.edu/ridgely/Volvo_docs/
This includes full pinout and signal description charts on pages 28-34 (like the LH2.4 and EZK charts at ipdown, but for regina/rex). Rex provides a RPM/Tach signal to Regina; Regina provides a Load signal to Rex. Unlike LH2.4/EZK116, I didn't see a Rex to Regina Knock enrichment signal.
For Renault/Fenix, there's a good description of the fuel and ignition tables at:
http://www.fenixecu.com/injection-fenix/cartographie?showall=1
The SAE paper on Fenix I describes the option of putting all the tables in an external PROM. If the 8-pin DIP chip shown in the board pictures is that PROM, then there's hope that the tables could be modified. The owner of fenixecu.com is the user "Manu" on the MegaSquirt forums (msextra.com/forums). He seems to be pretty active there, and writes in both English and French. Maybe you can contact him, show him the rex/regina board pictures, and ask if the 8-pin DIP chips are PROMs?
There's excerpts from a Volvo Greenbook that describe Rex/Regina in detail at:
https://people.ohio.edu/ridgely/Volvo_docs/
Well you guys have been a wealth of knowledge lol