OBD1 Oki66207 Reader-DIP64

First of all i'll thank Nico-HRED again for the info he posts in the general forum about the "66P507 Readout".

I adapted the idea and simplified it, so everyone of us can now readout the content of his 66207.

My reader is a bit different of the one he posted. I need a ECU with a 66207, a 27C512 (EProm), a 1 k Resistor, two wires and a RS232<->TTL converter.

The most of you will allready have this, if not, the parts are usual and cheep.

We need to modify the ECU a bit to have a nice 66207 reader, here is a short description:

• If your ECU isn't chipped, you need to add the 74HC373, the EProm socket and the 1kOhm resistor (R54).
• Connect a wire from the 66207 pin 16 (A15) to the Eprom Pin 1 (A15).

BUT DON'T PUT THE PIN 1 OF THE EPROM IN THE SOCKET! JUST CONNECT THE WIRE TO IT.

• Connect a wire from the 66207 Pin 19 (P2.2) to the 66207 Pin 27 (-EA).
• Remove the Jumper J1 and replace it with a 1kOhm resistor.
• Put in the 27C512 Eprom, programmed with my "ROMREADER" program on it.
• Connect your PC via a RS232<->TTL converter to the ECU (see Data Logging for more information).

Let's read a 66207:

• Switch off your ECU, or leave it off.
• Start the program on the PC: DOWNLOADER
• if the Address display isn't 0000, then click on RESET.
• Switch on your ECU
• After around 1 secound you should see the address counter running
• after almost a minute (i never stopped it) the address counter should show 8001
• now click SAVE to save your rom.

If something dosn't work, retry the procedure but don't forget to click on RESET.

Now have fun with your own 66207 reader.

Doc

Attachment:	Modify:	Size:	Date:	Who:	Comment:
downloader.zip	mod	225127	05 Mar 2004 - 18:09	blundar	Win32 downloader application
romreader66207.bin	mod	65536	05 Mar 2004 - 18:10	blundar	BIN file to use for reading MCU
romreader.txt	mod	2212	05 Mar 2004 - 18:10	blundar	Assembly source of reader program
66207_romreader.jpg	mod	57642	05 Mar 2004 - 18:10	blundar	Picture of hardware modifications