I am wanting to do the proverbial Z6 swap into my DX CRX.
I have searched around regarding the wiring and no one seems to use a conversion harness they just cut and splice at the ECM .
Can I use a D to B vtec conversion harness that I have?
Obviously I have to also convert to MPFI and vtec
This is just a stop gap swap as I collect parts to do a K-swap, so I'd much rather not cut all of my ECM wiring.

 

You don't need to convert to MPFI if you already have a D16A6 in your car.
It is an MPFI engine.

OBD0 to OBD1 jumper harness is what you want.
They are all over - even on ebay.
Plug and play. No cutting/splicing.

You may have to change out a couple connectors to plug into the alternator, distributor, and coolant temp fan switch, but that's all under the hood on the engine harness.

 

Thanks for the reply :-)
I don't know why I couldn't find that info by searching?

 

Literally the only plug you need to change on the bay side is the distributor plug. You might have to extend your map sensor wiring, or use the obd0 map sensor.

You can get an obd0-obd1 distributor jumper, or re-pin the like 10 wires.

 

It is a DX so it has the DPFI D15B2, so I need to convert to MPFI also.

 

I assume that I use the Z6 distributor?
Not the original D15b2 or a D16A6(Si) distributor?


I have read that it will be easiest to use the existing DPFI engine harness and add few wires rather than switching to the EF Si harness as the multi -plugs at the shock towers are much different. To rectify that it would require dash removal to swap out the firewall harness. Any comments on that would be appreciated.

 

Have not done a DPFI to MPFI swap myself, but I have repinned HF engine harness to match SI underdash harness.

If you don't buy a kit to convert, be prepared to repin.

 

Well, your subject title is contradicting your story now.
If you have a DX that has the DPFI motor, then it isn't a D16A6 and you will need to do the DPFI to MPFI conversion.
Do not let it intimidate you!

You run 2 new wires for the 2 new injectors. (you can use the 2 existing injector wires - A1 - inj4, A3 - inj3, A5 - inj2, A7 - inj1)
The stock injectors on the Z6 do NOT need an injector resistor box. So, you take the 2 wires that do NOT go to the ECU from the DX injectors and splice them together along with the 2 wires that are not hooked up to the ECU from the 2 new injectors. (The ECU provides the ground to the the injector, the wires being combined together provide the + when you operate the car.)

Depin and move 2 wires on the ECU (C1 to B10, C2 to B12) *If there were wires in B10 or B12, they can be cut and used in the next step.
Add 2 new pins to the ECU for the now empty C1 and C2 - these go out to the distributor to provide signal to the ECU to fire the 2 new injectors.

Swap the outer 2 wires on the TPS connector. TPS is on the opposite side of the throttle body and rotates in opposite direction on DX compared to all the MPFI.

THEN the harness will be converted to MPFI spec. You could drop a D16A6 right in along with it' ECU and it would run.
Add the OBD0 to OBD1 jumper harness and you can run the Z6 engine and ECU (requires some connectors to be swapped and extended as stated in earier posts).

 

OH CRAP! You're right! Thanks for pointing that out.
I never notice my incorrect heading!
Should read "D15B2 to D16Z6"
oops