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OBD1 B-series Wiring Guide

Wiring an OBD1 VTEC B-series into a 92-95 Civic

The most common cars for swaps are the EG-chassis line of Civics. Since there were way more base models produced than EX/Si models, chances are that your car is not already wired for a VTEC swap. Here's a quick chart of what to check when wiring in your 94-95 Integra B18C1 or 94-95 del Sol VTEC B16A3 into your EG. Most jdm motors will also follow this guide, but some changes will be made to your stock harness for it to work properly. Ensure that the following are all hooked up before you get any deeper into trying to figure out what's wrong.

B16A3/P30: 6 wires
Engine ECU
Part Wires Pin-out
VTEC Solenoid Yellow/Green A4
VTEC Oil Pressure Sensor Blue D6
VTEC Ground Black Chassis Ground
Knock Sensor Red/Blue D3
Evap Purge Power Yellow/Black 12V Power
Evap Purge Solenoid Red A20

B18C1/P72 and h22/p13: 7 wires
Engine ECU Side
Part Wires Pin-out
VTEC Solenoid Yellow/Green A4
VTEC Oil Pressure Sensor Blue D6
VTEC Ground Black Chassis Ground
Knock Sensor Red/Blue D3
Evap Purge Power Yellow/Black 12V Power
Evap Purge Solenoid Red A20
Secondary Intake Solenoid (IAB) Pink/Blue A17

If you have an EX/Si/VX most of these are already ran. Also, it has been our experience that most 1992 Civics, regardless of the trim level, are all wired for VTEC already. When doing a GSR swap, all that needs to be run is the knock sensor and the IAB's. For the rest of the model years, and the lower trims, you will need to run all of these wires. The professional way to do this is to actually re-pin the harness connector on the passenger side shock tower to accept these new wires and re-pin the ECU connector harness as well. Re-pinning tools are fairly inexpensive and can be found at most electronics stores. This way, you can simply plug in your obd1 GSR or del Sol VTEC motor with its harness right into your car. it retains the stock look, and makes your swap look much more professional than simply duct taping wiring together. It is also a good idea to wrap the new wires in loom much like the stock harness parts are.

Hopefully this article will help you get your swap underway, and have it come out clean and professional as well. As always, any questions, please post in the forums.