B series swap into an ek coupe
06-19-2016, 08:06 PM
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B series swap into an ek coupe
Hey guys, hoping not to get roasted, just need an answer to my question. So I have a 1999 Honda civic coupe si and this weekend I swapped in an ls non vtec b18b1, got everything finished expect for the wire harness... Do I need to use a D series wire harness with an obd2b-obd2a jumper harness? Because I have the b18b1 wire harness on, and nothing connects to the p75 ecu (the car is obd2b and the engine and ecu I swapped into the car is obd2a) and I have a few wires that don't connect to anything? Please help, this is my first ever swap and I just need some help to get her running! Thanks in advance!
Last edited by Zack Tieleman; 06-19-2016 at 08:36 PM.
06-19-2016, 08:39 PM
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Re: B series swap into an ek coupe
I fixed the thread, but the car is obd2b and the b18b1 and p75 ecu is obd2a, so I'm wondering, do I use my old D series wire harness, and then buy an obd2b-obd2a jumper harness so the D series wire harness (obd2b) can connect to the p75 ecu (obd2a)???
06-20-2016, 12:21 AM
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Re: B series swap into an ek coupe
If your car is a true 99-2000 Si (EM1), then your stock harness can be used. But yes, you will need a jumper harness to use the OBD2a ecu. eBay has some for around $85.
The distributor is another issue:
OBD2a: 9-pins
OBD2b: 7-pins (no tach signal)
Easiest dizzy fix is to use a B series non-vtec OBD2a distributor.
Or, install (solder) an OBD2a connector onto your main harness and run 2 additional wires from the dizzy into the car.
See this pic for info on the pinout differences:
http://ff-squad.com/tech/wiring/obd1-2dizzywiring.jpg
The distributor is another issue:
OBD2a: 9-pins
OBD2b: 7-pins (no tach signal)
Easiest dizzy fix is to use a B series non-vtec OBD2a distributor.
Or, install (solder) an OBD2a connector onto your main harness and run 2 additional wires from the dizzy into the car.
See this pic for info on the pinout differences:
http://ff-squad.com/tech/wiring/obd1-2dizzywiring.jpg
Last edited by Spiff671; 06-28-2016 at 10:56 PM.
06-20-2016, 03:58 AM
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Re: B series swap into an ek coupe
If your car is a true 99-2000 Si (EM1), then your stock harness can be used. But yes, you will need a jumper harness to use the OBD2a ecu. eBay has some for around $85.
The distributor is another issue:
OBD2a: 9-pins
OBD2b: 7-pins (no tach signal)
Easiest dizzy fix is to use a B series non-vtec OBD2a distributor.
Or, install (solder) an OBD2a connector onto your main harness and run 2 additional wires from the dizzy into the car.
See this pic for info on the pinout differences:
http://ff-squad.com/tech/wiring/obd1-2dizzywiring.jpg
The distributor is another issue:
OBD2a: 9-pins
OBD2b: 7-pins (no tach signal)
Easiest dizzy fix is to use a B series non-vtec OBD2a distributor.
Or, install (solder) an OBD2a connector onto your main harness and run 2 additional wires from the dizzy into the car.
See this pic for info on the pinout differences:
http://ff-squad.com/tech/wiring/obd1-2dizzywiring.jpg
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06-20-2016, 06:49 AM
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Re: B series swap into an ek coupe
It's not a true EM1, it's a Canadian Si, so it came stock with a D series engine. That's why I'm confused, because I can't use the b18b1 wire harness, **** doesn't line up, but the D series harness will line up with most things I believe, I would just need the jumper harness and do what you said for the dizzy
edit: you'll also have to repin the crank harness.
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