ld9gt

i have a 94 teg ls and i was wondering if any could tell me how to wire the
vtec to the ecu

1DA2NV

http://hondaswap.com/general-tech-ar...re-vtec-40811/ Google is a good start bro

From HT
This applies to cars that are not already pre-wired for vtec.

What you will need

1.Soldering gun
2.Solder
3.16-18 guage electical wire (7 feet apprx.)
4.1 big pin for ecu harness (A4 Vtec Soleniod)
5.1 small pin for ecu harness (D6 Vtec Oil Pressure Switch)
6.3/8 ratchet
7.10 mm socket
8.4-5 in extension
9.Connector for Vtec Solenoid
10.Connector for Vtec OP Switch
11.Heat Shrink tubing (8 inches or so)
12.Electrical Tape
13.Phillps Screwdriver (optional)
14.Convoluted tubing (3-4 feet optional)


1.Start by removing the negative battery cable.
2.Remove 6 screws holding the Glove Compartment in and then remove.
I'm not running A/C, so I chose to remove the glove compartment and
evaporator to gain access to the big hole on the firewall to route my wiring through.
You may choose to route it through another source in the firewall but I found this
to be the easiest way.
3.Pull carpet back
4.Remove 6, 10mm nuts holding in the kick panel that covers the ECU.
5.Remove kick panel.
6.Remove 4, 10mm bolts holding in the ECU and then remove the ECU.

Onto the Wiring.
7.Cut 2, 3 1/2 foot long wires from the 16-18 guage electrical wire.
If you are routing your wire through the firewall from a smaller opening
that the pins can not fit through, then route the wiring through the firewall after you cut the wires. If you choose to do it this way, be careful when
soldering your connections.
8.Start with the Vtec Solenoid connector.
Feed 2 in of heat shrink tubing through the wire then connect the wiring on
the connector to one end of the 16-18 guage electrical wire.
Then wrap the solder around the wiring connection you just made.
Melt the solder and then slide the heat shrink tubing over your connection.
Then connect the big pin (for the ecu harness/A4) to the other side of the
16-18 guage electrical wire
Take a look at the connection in the pic (nevermind the quadzilla in the backround)

9. Repeat the process for the Vtec OP Switch.
The connector for the Vtec OP Switch will have two wires. (one blue/one black)
The blue wire is hot, connect this to the 16-18 electrial wire.
The black one is for the ground, just connect this wire to the ground
on the thermostat housing where the other ground wire is.

After you heat shrink and electrical tape all of your connections,
they should look something like this.

10.Route the pins through the firewall to connect to the ECU harness.
Plug the pins into the appropriate position in the harness
Big Pin A4
Small Pin D6
Here's a pic of me inserting the A4 pin

11.After you have finished that, you can plug in the connectors to the
Vtec Soleniod and the Vtec OP Switch and then ground off the black wire
for the OP Switch.
I am using the h23 harness so I had to cut the connectors off of my jdm h22
harness. You will need these connectors to perform the procedure.
Another pic

12.Plug in ECU
13.Reconnect battery cable
14.Reconnect intake (i removed this because it makes things easier to work on)
15.Start car, make sure there is no check engine lights
let the car warm up, go test VTEC

If everything goes smoothly, bolt down the ecu and kick panel and reinstall
everything in reverse order and you're good to go.


Special thanks to Keith (CHK4TIX) for information on the installation procedure.

Also check out jdmlude dude's thread on vtec wiring for further information
http://www.honda-tech.com/zerothread?id=833163

And Satan's thread for ecu pinouts
http://www.honda-tech.com/zerothread?id=918703