94EG8

Just got done confirming a few things that I've yet to see any mention on.

1. '97 - '01 CR-V engine harnesses are a direct fit in '96 - '00 Civics with a B-series swap. Use a '97 - '98 CR-V harness in '96 - '98 Civic, '99 - '01 In '99 - '00 Civics (except HX) Tested, confirmed. If using an automatic harness you'll need to do a little extra wiring, more on this later.
2. '97 - '01 CR-V driver's side fluid filled rubber mount fits '96 - '00 Civics, I don't know if it's any stronger than the civic unit, but it fits, tested, confirmed
3. For those doing LS/B20 swaps into '99 - '00 Civics (except HX) '99 - '01 CR-V distributors use the correct small plug eliminating any cutting and splicing. Confirmed.

98cdmej6

so a few questions about this, cant find much info besides this post.

ive got a 98 civic with a 01 b18b swap.

if i go get a crv harness its got to be for the chassis year not the engine year?
the obd2a_obd2b differance confuses me.

will a jumper harness be needed to connect the crv harness to a LS ecu?

mainly @ 98EG8, "If using an automatic harness you'll need to do a little extra wiring, more on this later." i found your other thread about the dizzy plugs but not this, can i get a link or more info on differances of the auto or manual harness?
i imagine its a PITA to find a manual crv harness?...

TIA.

ehrkeith

Not sure if its been posted or known before, you can flip a LS throttle cable bracket and use a SOHC cable its a pretty good fit its what I did on my setup

Deetz

Use the harness for your gen of car...you have a 98 civic, so you use a 96-98 haness


You don't need a jumper harness if using if using an obd2A ecu

98cdmej6

gotcha, thanks man

94EG8

Correct, although something I found out after I posted this is it looks like '98 CR-Vs are OBD2B. I *think* '97 only CR-Vs are OBD2A.

If one is OBD2A and the other is OBD2B then yes. If you're using an '00 - '01 Integra ECU they have an immobilizer that you'll need to remove if you want the vehicle to start (it will throw a CEL for bad ECU but otherwise run fine unless you replace it with a dummy unit)

I never did find out anymore on this. I'd kind of forgotten about it honestly and haven't gotten my hands on an automatic CR-V harness to check. When we swapped the B20 into my friend's '99 Civic we just happened to get really lucky and found someone parting out an '01 5 speed CR-V and got the engine harness out of it.

98cdmej6

well ive done MORE digging and found another hiccup...
apperantly 97s didnt come in manual, majestic has mauals listed for 98+, so im unable to get a harness thats both obd2a and manual.

so would it be easier to...
convert a 97 obd2a auto to manual,
convert a 98 obd2b manual to obd2a,
or (maybe, just throwin it out here) "upgrading" both harness and ecu to obd2b, like my motor, but im not sure of how simple that will be.

im doing this because im sick of the hacked harness(useless plugs, extra wires, no heatshrink on splices, ect.) in my car, and am going to mildly tuck the new harness so im looking for one thats going to be close to plug-n-play so i dont have to do alot of splicing, or cut into the harness at all. just tryin to keep it simple.

94EG8

It's probably easiest to use a '96 - '98 5 speed EX harness and wire in the the secondary O2 sensor (or swap in a '96 - '98 EX cabin harness)

EFityo

hey i have a question about using a 99-00 civic si harness in a 99-00 ex. the ex harness has 4 plugs and the si harness only has 3? someone told me that the 4th plug is integrated into the firewall or something. im lost on this situation. if you could help me clear things up and tell me what i need to do to use the si harness in this car with a b16a2. thank you for your knowledge and time!

HondaPartsHero

A 96-98 EX harness which has 3 plugs (excluding the green plug) and the 99-00 Civics had only 2 (excluding the green plug) because the 3rd connector is incorporated into the chassis harness.

EFityo

so confused. i cant look at my car/harness right now. so all 99-00 even EX's have only the two(3total) plugs? so the si harness IS plug and play with 99-00 EX? my "A" plug will be in the cab on the ex?

tony_2018

I'm gonna correct this in only one way for anyone searching for ways to swap a b-series into an ek. If this is a b-series vtec engine you need to wire in the vtec wires, if gsr wire in the iab. Depending on the harness the knock sensor wire may be there already. Infact I'll say if its an obd2b crv engine harness than the knock sensor plug is there. I know because I have the high compression crv engine and it has a knock sensor in the back.

Actually this post also confirmed with me that it may be possible to swap an automatic b20 into the ek. I'm totally making progress on this.

Drillpvt69

I have a 93 Honda Del Sol that has a 2000 Honda CRV engine in it. However, I do not think the ECU was switched out. If I find a 2000 CRV ECU, will I need to get the wiring harness as well or will the Del Sol Wiring harness work? I have no problem with splicing the connectors if the existing wiring harness will work but the ends are different.

spAdam

iTrader: (1)

You need an OBD1 ecu for your swap. Generally, you try to match the ecu to the chassis you are using, it's much easier to adapt an engine of a slightly different generation.

Drillpvt69

I am assuming you are talking to me and I would agree. However, I bought the car with the swap already done so now I am just trying to make it work.

spAdam

iTrader: (1)

Yes, I was relying to you. Has the ecu been chipped or otherwise modified to run the B20? What ecu is in the car?

if it’s original, it should be a P06, P28, or P30 depending on if the trim level of the car is an S, Si, or VTWC, respectively.

Modifying the car to use the CR-V’s PHK ecu without issue or check engine lights is very very likely NOT what you want to do.

Drillpvt69

I am assuming it is the ECU that originally came in the car, but I am not sure what engine originally came in the car. It is something I can look up, but I haven't got to it yet. The mechanic said that I will need an ECU from a 2000 CRV since that is the engine that was put in it before I bought it. If it is that simple than cool, I will get one but I do not know if I will also need the wiring harness of if I can just splice the existing wires to the proper connectors. If that makes sense.

JRCivic1

That mechanic doesn't have a clue... find another one. There is no ECU that both runs the '00 B20 engine perfectly AND plugs directly into your Del Sol chassis... the closest choice would be to find a '94-95 P74/75 ECU from an Integra GS/LS/RS with the B18B engine.

If you were to try and use the '00 CRV ECU, you would need an adapter harness for the ECU plugs AND you would have to add a bunch of emissions related components to the car (including replacing the fuel tank for a '97 tank which has the fuel vent shut valve), and add the wiring for the CKF sensor to your engine harness. This would be required to keep the CEL turned out.

spAdam

iTrader: (1)

Thanks for adding.

Don't forget the fuel tank pressure sensor.

And the secondary oxygen sensor.

OP, pull back the carpet on the passenger kick panel to expose the ecu. report back with the part nbumber you find. We don't waste time with assumptions here.

JRCivic1

I would include both of these items as "Emissions Related Components"... either way, you and I are absolutely on the same page in suggesting to the OP that this path is WAAAYY more difficult than keeping the car OBD-1, and there is no functional reason to do so. If the OP lives in a state that requires an ECU to match the model year of the installed engine... then one might have to do this job the really difficult way.

Checking the current ECU version is a really good start.

ShinsenTuner

iTrader: (1)

So, for 96-98 Civics looking for a clean "non-jumper harness" method of converting to OBD2B, would a 98 CRV harness be the solution?

spAdam

iTrader: (1)

Yes. I’ve done this for a 99-00 in the past. Still have the harness in a box here, actually.

The only problem is that the CR-V was only offered in manual starting in 98, leaving you with one year of OBD2A harnesses. This makes them fairly rare.

JRCivic1

Yes, manual harnesses are incredibly rare... and you could also use an automatic engine harness and strip out/remove the auto related components for a clean install. No jumper harness would be needed for a '96-00 Civic as long as you used an engine harness and ECU from the same generation ('96-98 chassis uses a '96-98 engine harness and ECU; '99-00 chassis uses a '99-00 engine harness and ECU).

The adapter harness was mentioned recently in this thread because the poster I attached above has an OBD-1 chassis and asked if an ECU from the same year as the engine was needed.

ShinsenTuner

iTrader: (1)

So just to be clear. A 98’ CRV harness, that is OBD2b, will be a plug and play scenario into a 98’ Civic chassis, which generationally is OBD2a.

JRCivic1

I think the only difference between the '97-98 CRV manual engine harness and the '99-00 CRV manual engine harness is the distributor plug... which means you are only a distributor change away from a "clean install".