Diy: Complete Obd1 B18c1 Into Civic Vx Wiring

[simplegreen]

written by:dwnthehatch
from: jdmcivic.com

This thread is to end all of the confusion about wiring a USDM b18C1 into a VX civic using the VX harness.

WIRING A 1995 OBD1 B18C1 INTO A 1994 VX CIVIC USING A USDM P72 ECU

LOCATE THE 6 PIN PLUG BELOW ON THE PASS. SIDE VX SHOCK TOWER

The wires are in the following order:

ORG/BLU BLU/GRN WHT/BLK

BLU/YEL WHT/BLU YEL/WHT

REMOVE THE FOLLOWING WIRES FROM THE 6 PIN VX PLUG

ORG/BLU - O2 SENSOR

BLU/YEL - KNOCK SENSOR

LOCATE THE 10 PIN PLUG PICTURED BELOW THAT IS ON THE VX SHOCK TOWER

The wires are in the following order:

BRN/BLK EMPTY BLK/RED

ORG WHT ORG/BLU WHT/BLU

BLU/GRN BLU/YEL EMPTY

REMOVE THE RUBBER PLUG FROM THE TWO UNUSED SOCKETS

INSERT THE ORG/BLU (O2 SENSOR) WIRE INTO THE SOCKET BETWEEN THE BRN/BLK WIRE AND THE BLK/RED WIRE. (TOP CENTER SOCKET IN PIC)


INSERT THE BLU/YEL (KNOCK SENSOR) WIRE INTO THE SOCKET NEXT TO THE OTHER BLU/YEL WIRE. (BOTTOM RIGHT SOCKET IN PIC)

NOTE - IF YOU ARE USING A CHIPPED P28 ECU YOU WILL NOT NEED TO WORRY ABOUT WIRING UP THE KNOCK SENSOR


YOUR NEXT STEP IS TO MOVE THE RED WIRE ON YOUR ECU HARNESS FROM A20 TO A17 FOR YOUR SECONDARY RUNNERS FOR YOUR INTAKE MANIFOLD. THEY SHOULD OPERATE AS SEEN HERE.

ALL YOU HAVE LEFT YOU DO IS PLUG IN YOUR ECU AND PLUG THE 3 VX SHOCK TOWER HARNESSES INTO THE GSR MOTOR HARNESSES.
THIS ALSO FIXS THE FOUR TO FIVE WIRE o2 ISSUE.