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4G DX to ZC wiring conversion

  by kenji

In order to convert your dual point injection DX to multi-point injection you will need 4 injector plugs, an injector resistor box, extra wire, a wire stripper/cutter, heatshrink and/or electrical tape, and some patience. Also, when doing this conversion I would highly recommend soldering all connections and heatshrinking them. If you do not have access to heatshrink neatly wrapped electrical tape will do just fine. It is also extremely helpful to have an extra multi-point injection engine harness laying around to take plugs from (i.e. injector plugs, injector resistor box plug, and distributor plug). Listed below is a straightforward and easy to follow set of instructions to help you complete your DX to ZC swap:

DX to ZC

Inside car @ ECU

Pins B10 and B12 are empty. Unused pins can be taken from B2 or B11. Some models have a wire located at B12.

Cut orange and white wires off at C1 and C2 and connect them to wires added at B10 and B12. Orange-B10. White-B12. Leave enough wire for next step.

Run wires from C1 and C2 (direct ECU connection) into the engine compartment. Label these wires for later use.

Cut wires at A3 and A7 leaving plenty of wire. Run these wires into the engine compartment and label them for later use.


Outside car

Transfer DX wiring harness over to ZC engine.

TPS and EACV plugs are too short and must be extended.

Be sure to switch green/white and yellow/white wires on TPS


Injectors and injector resistor box

Connect the yellow/black wires from the two DX injector harnesses and run it to the yellow/black wire on the injector resistor box.

Connect the yellow wire from the DX injector to the #1 injector (brown wire).

Connect the red wire from the DX injector and run it to the #3 injector (blue wire).

Connect the A3 wire to the #2 injector (red wire).

Connect the A7 wire to the #4 injector (yellow wire).

Connect the 4 red/black wires from injector resistor box to each injector.


Cylinder position sensor

Connect C1 to blue/green wire on cylinder position sensor plug.

Connect C2 to blue/yellow wire on cylinder position sensor plug.

Thats it. Double check everything and start it up. Good luck!

This article replaces the previous DX to ZC article, however, you can still view it here.

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