Hybridwill

i got a 96' jdm b18c and am puting it into a 92-95 civic HB si, i got the OBD1 usdm p.72 ecu already but i was wondering will the jdm engine harness that came with the engine work or do i need the OBD2 usdm engine wiring harness? thanks!

ACRProject

JDM wiring harness will not work in a USDM car unless you modify it somehow to work. Use your stock wiring harness that is on your d series and put it on the b18c and add wires (vtec solenoid, vtec oil pressure swtich, knock sensor)

Vtec Solenoid - A4
Vtec Oil Pressure - D6
Vtec Ground - Chassis Ground
Knock Sensor - D3



P.S: i just notice your car was an Si, so that means you just need to add a knock sensor wire.

VTECVillain

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ACRProject &raquo;</TD></TR><TR><TD CLASS="quote">i just notice your car was an Si, so that means you just need to add a knock sensor wire.</TD></TR></TABLE>

Since he's got a P72 ECU, I'm assuming that it's a GSR spec B18C which would also require wiring up the IAB as well as the knock sensor. Using the OBD1 stock Si harness, you will need to rewire the distributor, injectors and alternator with OBD2 plugs from the JDM harness. You could also get a USDM GSR or ITR OBD2 engine harness and make it more plug and play compatible but it really isn't necessary.

chinoty

i have 98 gsr motor in my 92 civic si hatch and the swap was easy. want you need is the gsr ecu mainly. you have to hook up the both knock sensor and IAB, secondary butterfly. just two wires for thoses. for the two wiring harness. everything is color coded and fits directly on the obd2 plugs. other words use the obd2 plugs and dont use the obd1 plugs, cause the injectors and distributor plugs, alternator plugs are obd2 from an obd2 motor. one more thing the crank angle sensor, you wont be needing that, its located on the oil pumb by the cranck pully.

ExiledinIN

Just want to just double check. I have a 93 ex and putting in a b18c.

all i do is the following:
1. remove wiring harness from D16Z6
2. remove wiring harness from b18c and set it aside
3. place wiring harness from d16z6 onto the b18c
4. add the two additional wires for the iab and knock sensor wire

Is this right?

VTECVillain

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ExiledinIN &raquo;</TD></TR><TR><TD CLASS="quote">Just want to just double check. I have a 93 ex and putting in a b18c.

all i do is the following:
1. remove wiring harness from D16Z6
2. remove wiring harness from b18c and set it aside
3. place wiring harness from d16z6 onto the b18c
4. add the two additional wires for the iab and knock sensor wire

Is this right?</TD></TR></TABLE>

As long as the components (alternator, distributor and injectors) or complete motor is OBD1 then that's all you need to do. Of course a few sensor plugs will need lengthened and/or unloomed to reach their destination.
If the components or engine is OBD2 then you will need to change the distributor and alternator plugs and also the injector clips to the OBD2 plugs from the B18C harness. The extra added wiring will still be the same: IAB and Knock

ExiledinIN

Great! Yes, the engine is an ODB1. Can you let me know which sensors need to be lengthened/unloomed?

ExiledinIN

Anymore details on which ones need to be extended. I've searched and looked at all kinds of threads, but no one ever mentions which sensors need to be extended. I guess I can figure it out, but it always helps to know what to expect.

Tonight, I hope to have my old civic engine out...

Katman

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ExiledinIN &raquo;</TD></TR><TR><TD CLASS="quote">Anymore details on which ones need to be extended. I've searched and looked at all kinds of threads, but no one ever mentions which sensors need to be extended. I guess I can figure it out, but it always helps to know what to expect.
</TD></TR></TABLE>

Normally the VTEC solenoid wires need to be extended and maybe the 02 sensor plug as well.

ExiledinIN

I've got a really stupid question. The two wires that I am adding (IAB and knock). I know they go to the ECU harness. Where do I get the pins to add to these wires?

EVILhatch

when i put my 96 itr in my 92 eg i had my p28 chipped to itr spec by kenji and just got a usdm vtec solenoid and a 2000 usdm itr wireharness and it was all plug and play.

GiT LaO'd

Just want to just double check. I have a 93 ex and putting in a b18c.
all i do is the following:
1. remove wiring harness from D16Z6
2. remove wiring harness from b18c and set it aside
3. place wiring harness from d16z6 onto the b18c
4. add the two additional wires for the iab and knock sensor wire

Is this right?

You will only need the knock sensor because you already have vtec...The IAB sensor can be repined from A20 to A17...It is a red wire...Now the sensor on the engine harness will be the one that went to the EVAP Solenoid on the D series Intake manifold, you know that little oval black canister...Take that sensor and plug it into the IAB which is under the intake manifold of the GSR...

ExiledinIN

Ok thanks, but what about the knock sensor. How do I get a pin for that wire to go into the wire harness?

Katman

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ExiledinIN &raquo;</TD></TR><TR><TD CLASS="quote">Ok thanks, but what about the knock sensor. How do I get a pin for that wire to go into the wire harness?</TD></TR></TABLE>

Well, you'll have to find someone or some place that has a spare set ecu plug pins.

Once you get your hands on a pin, located the Knock Sensor (KS) on your GSR's engine harness (if your motor came with one), and cut the KS from that harness and make sure you cut enough wiring with it (at least 3 inches or more). Get some new wire, splice it into KS wire (to lengthen it), and run the wire through your firewall to the ecu plugs, then splice the newly extended KS wiring to the ecu pin wire and place the pin in the D plug (D3 location).

But if you're running a P28 ecu you don't have to wire in the KS at all, because stock and reprogrammed P28's do not look for a KS in general.

ExiledinIN

You don't think I can get a temporary fix by using a radio harness pin do you? I really need to get this working tonight as we rented the drag strip for tomorrow...

Katman

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ExiledinIN &raquo;</TD></TR><TR><TD CLASS="quote">You don't think I can get a temporary fix by using a radio harness pin do you? I really need to get this working tonight as we rented the drag strip for tomorrow...</TD></TR></TABLE>

No i dont think so because the radio pins are too big for an ecu pinout.

Hmm...
If you removed your A/C system and/or if you're not using power steering, you CAN technically unpin any 1 of those items from the ecu plug and use one as KS wiring..

PIN A15 = A/C clutch relay fan if the wire color is black/red

PIN B5 = A/C input (blue/red wire)

PIN B7 = CX upshift light (you probably have a blank spot here tho, since you own an Si)

PIN B8 = Power Steering pressure Switch

ExiledinIN

Thanks, I ran over to the junkyard and they happen to have 2 civics there. They didn't have an ECU but I went ahead and grabbed some connectors that are close to the ECU connectors (hoping that the pins will be the same). If not, then I will use the AC pins as you pointed out. Thanks! That should have been an obvious option.

I did get the AC bracket and will hook up the belts for the AC, but the AC is secondary at the moment.

THCk20eg

everything should just plug in, you can use your stock harness or the gsr harness. all you have to do is run the knock sensor. vtec is already there.