I recentley went with b16a in my EF dx.

Its obd0 with no o2. I got and engine light and guessing its o2.

Either way, how do i read codes with a pr3 if there is no little red light on the body of the ECU???

Its obd0 so it should just blink, but there is no actual physical little red light bulb and i would like to know what codes im throwing.

I just thoguht it was really wierd that obd0 ECU has no bulb, how do you read the codes on it then?

thanks..

m-

 

hmmm my pr3 has a bulb.
did it blow out?

 

i dunno there isnt an opening on the panel of the ECU, like there is no little round window thing. I wonder is the side was swapped out. Ill check that tom, but there gotta be one? i thought it was really wierd

 

there should be a darker softer squishy styrofoam thingy
then there is a hole.
with the light.......that blinks

 

you mean on the outside case on the ECU or on the inside? There is nothing but a screw in the middle of the wall

 

this is what mine looks like minus the mancy aftermarket logos,
mine is gold. you can the the light next to the screw.

http://media.photobucket.com/image/p...r/IMG00123.jpg

 

yea thats what i figured it should look like but all i got is a screw, no round little window for a light on either of the sides :/

 

hmmm idk then man.open it then see if there is a light.that side may have been swapped or it might be backwards.if that dont help you.....its past me

 

Sounds like someone swapped in a obd1 top cover on your obd0 pr3 either that or the ECU itself is a obd1 PR3.

As the guy above me said, pop the top cover off, more than likely someone just didn't use the stock cover on the ECU.

 

i cant be obd1 tho i got resistor box and everything, must be still obd0

 

wtf modified?was that already there?there should be a light in that hole.

 

That ECU is an OBD1 ECU.

pr3-j01 (JDM 92-93)

Having a resistor box means nothing, if you have saturated injectors or DSM injectors those require a resistor box to be hooked up in order for them to work properly.

The ECU is chipped with EcTune or some other stand alone EMS as indicated by the external board on the bottom left of the ECU.

In OBD0 - OBD1 there are 2 wires you have to connect together to get the codes to flash, in a conversion harness these are done, however, they might have just replaced the whole underdash with an obd1 unit and there is a plug where the ECU would normally be that has 2 prongs that you jump with a safety pin or a piece of wire and the codes will flash on the CEL itself.

Also they may have just repinned the ECU plugs.

 

all i did is soldered into my under dash harness, it was already cut out of the harness that the swap was in. If that make sense. Basically they took the bunch of wires that come out of the dash harnes and go to ECU, cut it and i soldered them into my existing harness. All the extra wire like 2 more injectors, vtec, all that runs from ECU through the jumper to PM6 plugs then into a separate bunch of wire to a plug at the firewall and then the whole harness is all done ready to be plugged in.

So i dont think i would have that plug i could jump, because i only touched the harnes that goes directly to ECU and soldered provided< all ready made harness with ECU plugs and jumpers

I hope this make sence

 

This is sorta what it looks like:

 

i wonder if there is a different way of jumping those wires together to read codes. They must have a spot at the actual ECU that i could join into and jump them?

 

So initially you have a jumper harness, that's fine. d4 is one of the pins you need to jump and I believe the other is just a ground (someone has to verify this as Im not 100%)

 

ok, so this leads to me being obd1, but i do have a one wire o2 that isnt pluged in btw.

 

can someone confirm this for sure?


and how does the single wire o2 and obd1 works?

 

BUMP, still need help with this.

1. I MUST be obd1 if i got obd1 ECU? SO what injectors can i use? I got a crack in one of them.
2. Why do i still have one wire o2?
3. Still need to know if d4 is the wire i need to groung in order to get CEL's working.

Thanks!