THIS IS FOR: everyone who wants to keep the obd2a EX harness and install a gsr! it shows the wires you will need to unpin, solder, and cut! i just finished this a few minutes ago, and i listed ff technet as a major contributor!
-However!! Those who do not already have vtec on there harness will need to look else where, because i dont need to run it so i didnt make a diagram-


http://i143.photobucket.com/albums/r...ngdiagrams.gif

 

bump. a sticky would be sweet

 

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topped for others

 

Just to clarify but this diagram is intended for someone who does NOT have the OBD2A EX harness correct? EX harness users would only need to perform IAB wiring and secondary O2 wiring I believe. If so, please specific so as not to confuse everyone.

 

Curious... what's the point of the CKF and crank sensor wiring? When I did mine, I don't think I messed with those at all... If I remember right, my EK y8 had knock and CKF and I just plugged them in. Never threw a CEL for them.

I did however, have to swap pins B16 and (if I remember right) B15 for the fuel pump relay, or else it wouldn't start. This is in a 2000 car with a 2001 B18C1, and staying OBD2B.


EDIT: oh, didn't see you were talking about OBD2a cars.

 

Nice job!

Mines OBD1 lol but good write up.

 

this is FOR someone with a obd2a ex 96-00 harness. the obd2a plugs for ex have the knock sensor pinned but i dont think i actually had the plug on the block? im not sure on this so i just repinned the plug and ran a wire/plug to the knock sensor on the bseries block. as far as i know only bseries's have the knock sensor. i didnt have to run a 2nd o2 sensor however.. i just cut the wireloom far enough to pull the plug to the back of the block, so really theres no need to run another o2 sensor. ek's should already have a down stream o2 sensor for those who didnt know

o2 locations-

Ek:
upstream- on the header
downstream- lower end of the cat

Gsr:
upstream- front end of the cat
downstream- lower end of the cat


for me, the CKF on the obd2a harness was a different plug and i didnt feel like re-pinning and sending another plug so i just wired it into a different signal

so far iv driven about 300 miles and 0 cel's so this WORKS for OBD2A ecu's with a EX harness

 

bump

 

i have gsr OBD1 going into 93 civic which is OBD1. What are the two wires i need to play with to connect this two together?

 

useful info

 

Ek hatches did not come with downstream plug under the chassis. only the ex came with it. the ek hatches are on the dx harness.

 

your right, thats why i said ex harness