That's so if the computer finds any fault (check engine light comes on), you can hook those wires together and pull the code telling you what fault it found. Then that gives you an idea of what may be wrong ... or it at least helps you find the general area.

Richard <img src="/forums/images/graemlins/patriot.gif" alt="" />

Had an 89 Isuzu Pickup
Had a 94 Mitsubishi Eclipse
84 Honda XL185S
Had an 89 Isuzu Trooper w/ 3.4 V6
01 Toyota Tundra SR5 V8 4Door Access Cab
http://community.webshots.com/user/rsayloriii