OBD0 to OBD1

92 Civic HB

New Member
5+ Year Member
I have a 1990 honda civic hatch OBD0 and i am wanting to convert it to OBD1 the whole car harness. What will i need to do this operation?
Thanks, Colt
 

92 Civic HB

New Member
5+ Year Member
thanks but what i am looking for is to take the obd0 car harness out and replace it with a obd1 from a 5th gen and needed to know if any of the connections would have to be converted.
 

bptcivic89

New Member
5+ Year Member
I have a 1990 honda civic hatch OBD0 and i am wanting to convert it to OBD1 the whole car harness. What will i need to do this operation?
Thanks, Colt
its a can of worms just did one not worth it get 88 hf wire harness run wires for vtec solenoid an knock sensor an pressure switch then buy a jumper harness for the computer
 


Scrpn17w

Si wannabe
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5+ Year Member
Get a jumper harness from one of the many places that make them and wire up the 8 or so wires you need to. It's really easy. Just learn to use the search button.
 

Steven.

Formally Green 91
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dont think ive ever seen anyone do the entire harnness before, dont think you cant since no 88-91s came OBD1.

probably all the connections need converted, since the obd1 harness wont have any connectors for the 1990.

why would you need to do this
 

Steven.

Formally Green 91
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Junkyard...
Why do u need to change the whole harness?.
I had to almost completely redo the ecu wiring in my crx.
 

92 Civic HB

New Member
5+ Year Member
the car harness got cut and there was multiple wires the same color and i couldn't find the match.so therefore, im looking for a whole car harness
 

Steven.

Formally Green 91
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Makes sense. I'll c Wat I can find. What model and year 4th gen harness u looking for?
 

Steven.

Formally Green 91
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i was going to change the whole dash harness when i started wiring my B18c1, it was a total birdsnest from the previous owners mpfi conversion.
 


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