How to Make an OBD0 to OBD1 Dizzy Jumper Harness

The on-board diagnostic systems (like the OBD1) in cars and trucks monitor vehicle problems and warn the driver when there are problems. B-series engines that were stock engines in both Acura Integras and Honda Civics used the older OBD0 style diagnostic system until the OBD1 system was released in 1992. Construction of an OBD0 to OBD1 dizzy jumper harness will make it possible for the older on-board diagnostic system to function with the newer system.

Instructions

1

Open the hood of the vehicle and remove the negative battery cable with the adjustable wrench.

2

Locate the OBD0 plug near the steering harness on the rear, driver's side of the engine compartment of the engine. Trace the wiring to the old OBD0 distributor wiring.

3

Use the socket set to remove the distributor cap to access the distributor wiring harness

4

Connect the seven-wire OBD0 distributor plug to the corresponding wires on the seven-wire OBD1 distributor plug. On the seven-wire system, the orange wire connects to the orange wire. The white wire connects to the white wire. The orange/blue wire connects to the orange/blue wire. The white/blue wire connects to white/blue wire. The blue/green wire connects to blue/green wire. The blue/yellow wire connects to the blue/yellow wire. The only nonmatching color pairing will be the white wire on the OBD0 to the yellow/green wire on the OBD1. Cover the connections with electrical tape.

5

Connect the black/yellow wire on the OBD0 plug to the matching wire on the OBD1 short distributor plug and then connect the blue plug wire to the blur plug wire. Wrap the wire connections with electrical tape.

6

Replace the distributor cap and tighten it with the socket set.

7

Replace the negative battery cable with the adjustable wrench.