I just finished helping out a friend with his ecu, an OBD1 PR3. We were unsuccessful in getting it working, it acts as though there's no chip in the socket when the jumper is connected, when we unplug the jumper life is good on the stock map.
I'm just wondering are there more capacitors or resistors that need to be installed in the obd1 pr3 than a p28 or p30?
I noticed the black unit that sits toward the case of the ecu is missing but there is a daughterboard, i assumed that the daughterboard replaced this piece?

I double/triple checked all the solder points as well as made sure the board was clean from any debris or bits of solder on any of the leads. it's a hell of a lot cleaner than the p28 i run in my car yet it still doesn't work.
if it matters, i used a moates uberdata kit for it. (really nice kit moates )


if anyone has any ideas i'd be very interested to hear them

thanks in advance

-Brent

 

pr3 is obd 0 there hoss...

 

yeah, not so much.

this one is obd1.

 

bump for an answer

 

The board should be a 1720, just like the P28, P05, and P06 ECUs made between '92 and early '94. The chipping procedure should be the same. I assume the daughter board to be the knock sensor processor.

 

hrm, i must have fried something when i was desoldering.

damn. thats one dead ecu for me

 

post the pic of the solder joint on the socket. check all the solder joints.

 

the ecu is gone, i might be able to snap a pic when the owner gets back from up north. (he's on a 10-4 rotation.) i'll just keep this thread bookmarked for now.

 

Well if you burn through just 1 track on the ECU its junk. takes a steady hand and patience to chip a ecu. but yes the chipping process is the same as a P28, P72, P06 ECT