HondaPartsHero

THIS IS IN PROGRESS AND WILL CONSTANTLY BE UPDATED. I JUST POSTED HERE TO SEE WHAT IT LOOKS LIKE IN FINAL FORM. BARE WITH ME AS I WILL SLOWLY ADD SECTIONS. THANKS

92-00 Swap Wiring Guide for VTEC and Non-VTEC

Being around here and the scene for a bit I figured I’d try to compile one thread that would try to answer pretty much 95% of all questions concerning swap specific wiring for 92-00 Civics of all models. Mostly this will be B and D series engines as they are the most common swaps, as I’m not that familiar with too many H or F series specifics, however I’ll add some links to good write ups for these. Also I won’t include any K or J series either as they are bit out of my realm and there are some good write ups already concerning the swap in general. If you would like something added or need to correct me PM me instead of posting in the thread so we don’t clog it up too much. I wanted to do this because often times I end up posting the same thing to answer people and retype what I’ve answered in previous threads. I don’t know everything but I love to learn what I don’t know and put it out there for people to solve their problems and also for them to learn more as well. Thanks

Swapping OBD1 engine/ECU into OBD1 Civic
(note for all 92 Civics the VTEC is already ran on the shock tower to ECU harness so using an EX/SI 92-95 engine harness will make VTEC plug and play.)

D16Z6/D15B(JDM)*/Mini Me using P28 ECU
*If your JDM D15B doesn’t have a VTEC pressure switch you will need to unscrew this bolt and thread in one from any 90-01 Civic/Integra/Accord


DX
-Will need to wire up VTEC solenoid and VTEC pressure switch to the P28 ECU all else will be plug and play


CX
-Will need to wire up VTEC solenoid and VTEC pressure switch to the P28 ECU. If your CX model is NOT 4 wire you will need to wire up the 3 additional O2 connections below to the ECU.


VX
For VTEC wiring see above pic. For knock sensor and IAB wiring see above pic (if using the chipped P28 you won’t need to wire IAB or knock sensor). If your VX has 7 wires you will need to wire up to make it 4 wire (diagram here http://www.hybridautomotive.com/tech/o2/)

B16A3/B17A/B18C1/B18C(OBD1 JDM) using chipped P28/P30/P61/P72 ECU

EX/Si
VTEC is plug and play. For knock sensor and IAB wiring see above pic (if using chipped P28 IAB and knock sensor won’t need to be wired up). All else is plug and play.


DX
For VTEC wiring see above pic. For knock sensor and IAB wiring see above pic (if using P28 you won’t need to wire IAB or knock sensor).. All other wiring is plug and play.

CX
For VTEC wiring see above pic. For knock sensor and IAB wiring see above pic (if using the chipped P28 you won’t need to wire IAB or knock sensor). If your CX model is NOT 4 wire you will need to wire up the 3 additional O2 connections below to the ECU. All other wiring is plug and play.

VX
Reuse VTEC solenoid and pressure switch wiring for plug and play. If your VX has 7 wires you will need to wire up to make it 4 wire (diagram here http://www.hybridautomotive.com/tech/o2/)

B18A(OBD1)/B18B in DX/CX/VX/EX using P74/P75 ECU/all chipped OBD1 ECU’s

DX/EX
Plug and play.

CX/VX
Plug and play. For 1 wire CX models you will need to wire in the additional 3 wires for the 4 wire O2 (see pics above). If your VX has 7 wires you will need to wire up to make it 4 wire (diagram here http://www.hybridautomotive.com/tech/o2/). All else is plug and play.


OBD2 engine/OBD1 ECU into OBD1 Vehicle
(note for all 92 Civics the VTEC is already ran on the shock tower to ECU harness so using an EX/SI 92-95 engine harness will make VTEC plug and play.)

D16Y8 using P28

EX/Si/VX
Mostly plug and play. VTEC plug and play. Knock sensor will not be used for the P28 ECU. The EX/Si/VX distributor will not bolt up to the Y8 head exactly. You can use it but not all legs will bolt up. To use the Y8 distributor you will need an OBD2A or OBD2B to OBD1 adapter harness. The intake air temperature sensor is not located on the intake manifold of the Y8’s so you will need to relocate your IAT sensor in the intake arm (see pic) OR use the Z6/Z1 manifold which will bolt up to the Y8 head fine. Reuse the Z6 injectors as the Y8’s will not plug in correctly. For the VX you will need to use some EX/SI/DX injectors for similar Y8 flow rates. Also reuse the Z6/Z1 alternator as the Y8 uses a different plug style. CKF sensor by the crank on the Y8 will not be used tie it out of the way. For the VX model use the above instructions to convert the 5 wire O2 to 4 wire.



DX/CX
Mostly plug and play. Will need to wire up VTEC solenoid and pressure switch (see pics above). Reuse the DX/CX distributor as it will bolt up. To use the Y8 distributor you will need an OBD2A or OBD2B to OBD1 adapter harness. The intake air temperature sensor is not located on the intake manifold of the Y8’s so you will need to relocate your IAT sensor in the intake arm (see pic) OR use the CX/DX manifold which will bolt up to the Y8 head fine. You can use the DX injectors as they are the same flow rate. For the CX you will want to get some EX/SI/DX injectors as they are a higher flow rate as the Y8’s. Also reuse the CX/DX alternator as the Y8 uses a different plug style. CKF sensor by the crank on the Y8 will not be used tie it out of the way.


B16A2/B18C1 (OBD2)/B18C5 using chipped P28/P30/P72

EX/SI/VX
Mostly plug and play. VTEC plug and play. Knock sensor will not be used for the P28 ECU but will for all others. To use the A2/C1/C5 distributor you will need an OBD2A or OBD2B to OBD1 adapter harness. The intake air temperature sensor is not located on the intake manifold of the A2 so you will need to relocate your IAT sensor in the intake arm (see pic). Reuse the Z6 injectors as the A2/C1/C2 will not plug in correctly. For the VX you will need to use some EX/SI/DX injectors for similar A2 flow rates. You will need to use an OBD1 B series alternator for plug and play. CKF sensor by the crank on the A2/C1/C5 will not be used tie it out of the way. For the VX model use the above instructions to convert the 5 wire O2 to 4 wire.

DX/CX
Mostly plug and play. Wire up VTEC as pictured above. Knock sensor will not be used for the P28 ECU but will for all others. To use the A2/C1/C5 distributor you will need an OBD2A or OBD2B to OBD1 adapter harness. The intake air temperature sensor is not located on the intake manifold of the A2 so you will need to relocate your IAT sensor in the intake arm (see pic). Reuse the DX injectors as the A2/C1/C2 will not plug in correctly. For the CX you will need to use some EX/SI/DX injectors for similar A2 flow rates as the OBD2 injectors won’t plug into the OBD1 plugs. You will need to use an OBD1 B series alternator for plug and play. CKF sensor by the crank on the A2/C1/C5 will not be used tie it out of the way. For the 1 wire 02 CX model use the above instructions to convert the 1 wire to 4 wire.

B18B(OBD2) using P75 ECU


EX/SI/VX/DX/CX
Mostly plug and play. For the distributor you will need to use an OBD1 B18 for plug and play or use an OBD2 LS dizzy with an adapter harness. Alternator will need to be OBD1 B series for plug and play. For EX/SI/DX you can reuse the EX/SI/DX injectors, for VX/CX find some EX/DX/SI injectors for plug and play. CKF sensor by crank will not be used. For 1 wire O2 CX models use above instructions for conversion to 4 wire O2. For VX 7 wire O2 use above instruction to wire up for 4 wire.

OBD0 engine into OBD1 vehicle using OBD1 ECU

B18A (OBD0) using P75 OBD1 ECU

EX/SI/DX/CX/VX

Mostly plug and play. The alternator will plug in as the OBD0 and OBD1 alternator plugs are the same. For injectors you will need to reuse the EX/SI/DX injectors and for CX/VX find some EX/SI/DX injectors and use those. The fan switch location is different for the OBD0 engine and is on the back of the block. You will have to rewire the fan switch from the thermostat housing of your engine to the back of the block. The wiring order doesn’t matter so you will need either some connectors from a junk yard or some way to wire it up to that location (see pics below). For VX 7 wire O2’s and CX 1 wire O2 use above diagrams to rewire for 4 wire.

graveltravel2

great writeup!!! gonna need it when i put a B18C1 in my vx.

Oliver Koelsch

hello my name is Oliver, i take my eg4 to the garage to renew the cylinder head gasket. After he changed, he said my ECU P84 is broken, i went there , and the car didn't throttle. When i start it idle normal, but i cannot throttle. He took another ECU( I don't know the serie) and can throttle. He want to sell the ECU very expensive, so that i baught another P84 by myself, but the problem is the same.
Can it be, that if i buy a P28 or another instead of the original P84 , that the car runs? is the fault perhaps in a sensor, which is not used in another ECU?
perhaps Camshaft sensor or crank sensor ?