About 2 months ago i picked up a 98 civic ex. it had the 2000 front end swap, 2000si interior, dash seats, it had a 00 si harness that was all chopped up and the car itself had a f23 in it. shortly after getting the car i got the jdmb16a sir2 motor from hmotors and decided it was time for a swap, i made the si harness work for it and at first the car wouldnt start. i realized the tranny ground wasnt on put it on then the car started. it would idle at 1800 then suddenly jump up to 2800. i decided the problem was somewhere in the harness so i purchased a 98 civic dx harness that my buddy used in his coupe and it was already wired for the b16. i plugged it in used my buddys obd2 ecu so it would just plug right in and the fuel pump wont prime. my jumper harness is on its way this week. but all i did was switch engine harness's and it is causing the fuel pump not to prime i dont understand this. also since the dash was converted to 2000 i have that extra wire running in along with the green clip. it is the exact same as the one gray clip to go into the ecu but im not sure if it plugs in or just sits there. any advice would be appriciated. i just need to get this car running.

 

Go to the junkyard and rip the main harness, dash harness and engine harness out of a 96-98 civic ex.

Or go with dc2pro...IMO the wiring mess you have right now needs to go before something catches on fire.

 

you need to change one of the pins on the connectors....

you switch the fuel pump from slot 15 to 16 or something IIRC.....

search for OBDII Fuel Pump wires....i think it will come up...

 

heres the problem....you have a OBDIIa vehicle.....

the swap is OBD2b.....the pinout for the fuel pump is changed from obd2a to obd2b....


you need to change the pin on connector harness A15 to A16.....

here is diagram to show....

the wire is blue/yellow


THE PARTS IN BLUE IS WHAT YOU ARE LOOKING FOR.....FOLLOW THE DIRECTIONS

 

We need to know what year main harness, dash harness and ecu are being used.

 

you said you got a 98 DX harness from your friend already wired for a B16....


what year B16 did your friend have?

THATS the million dollar question...

 

The year of the motor has nothing to do with the car wiring...that motor can go into a 92 civic cx with a gsr engine harness and run like the wind.

 

^^this dude is right lol. i have jdm B16 HEAD on a USDM 1999 GSR block running in a 1998 Civic EX. Hondas are like big legos :D

 

the motor is a jdmb16 from hmotors which is obd1, the car started with the si harness and the obd2b to obd jumper. i switched harnesses to a 98 civic dx harness which i got from my buddy who used it on the exact same motor. my new jumper harness will be in tomorrow but with just 98ecu it will not prime the fuel pump. the one plug that runs in with the car, beside the green clip, is the same as the one on the engine harness. which one would i want to use and change the fuel pump pin connection? once again when i got the car it had a 00 accord motor which was the f23

 

OKAY so you had a 99-00 engine harness, switched to a 96-98 and now the car doesn't start??? That's your issue right there

 

i dont understand that. even though i switched harness's to the 98 it was already wired for the b16. it ran the same exact motor in a 98 coupe. i even got the new jumper since i went back to obd2part1. now with those 2 plugs that are the same running to my ecu the 1 from the harness when plugged in does nothing. the other 1 does nothing but atleast throws a check engine light. which one if those should i mess with the fuel pump wiring?

 

also i just changed the fuel pump pins and it will not start. someone please help

 

anyone? once again its a 98 civic ex. has the dx harness and a jumper harness to a chipped 28. the motors an obd1 b16a. the car turns over but the fuel pump wont prime. the old motor was a 00 accord motor with a si harness. also has full si interior and dash so it has that cabin wire or whatever its called

 

96-98 and 99-00 engine harnesses are different on the car side...the plugs are different where they attach to the main harness. you cant just mix and max the different harnesses without having an extra plug somewhere

 

check the ground where the thermostat is located it the one with the ten bolt does ur car turn over or anything ?

 

well i got it started, what i had to do was trace the fuel pump wire on the cabin harness and repin it into the dx harness. it runs now but the tach and speedomater doesnt work. also vtec isnt crossing and its ideling rough

 

Like I said, 96-98 harnesses are NOT the same as 99-00 harnesses. Look hard and you'll see an extra plug by the ecu...it leads to the dashboard, hence your speedo/tach do not work.

 

yea that extra plug is called the cabin harness i thought. i said that already. but cant i just repin some of the wires? i already had to take the fuel pump wire out of that extra plug and put it into the 96-98 harness to get the car to start. what other wires do i need to switch out?

 

I'm not sure if you can pin that out...one of the years has the main harness plugging directly into the ecu, another year has a piece of the engine harness bypassing the ecu and going directly to the main harness.

 

well if it helps it plugged into the ecu when i had the si harness on the f23. i just dont know too much about it though. if the problem with the tach and speedomater runs in there what about the fact that vtec wont cross. it runs like a normal b16 just with no vtec

 

no speedometer=no vtec

 

i am having a very similar problem, i have a p2t ecu hooked up to my b16 through a 99-00 civic si harness and now i have no speedo or tach so i am wondering what the best way to make it all work with my 98 cx hatch. would everything plug up if i change out the cabin harness to the 99-00 civic si harness to ... i know the 99-00 civic had the newer climate controls and all that, your help i greatly appreciated.