ephatchback
05-13-2003, 11:44 AM
I finally got my air/fuel ratio guage working on my ep. Here's a quick how-to on the installation.
There are four wires coming out of the guage(the one I have anyway), ground, light, power, and o2 censor wire.
I connected the ground wire to the main ground on my engine.
There's an opening in the firewall right above your ecu. I put a droplight in the engine bay so I could see any openings in the firewall. Run a clothshanger wire through the opening. Tape the guage wire to the hanger wire and pull it through. Do this with all the wires except the power wire.
For the light wire I pulled it through the firewall and used a butt connector to tap into my side marker light(you might want to run this wire to a headlight. My sidemarkers are wired to my headlights, they're on all the time.)
For the o2 censor wire run it through the fierwall, put loom around it and run it down beside your o2 censor wiring harness all the way to your cat-converter. There are 2 o2 censors under your car. Primary(located at the bottom of the header). And secondary (located in the cat). The one you need to tap into is the secondary. There are 4 wires coming out of this o2 censor, 2white, 1grey, and 1black. Use a butt conector and tap into the BLACK wire. Autometer will tell you its the green one in the primary censor, but it's the black one in the secondary censor.
And finally, using a butt connector, I connected my power wire to the remote wire in the back of my factory head unit. You need to wire it up so it only comes on when the car is on.
I installed the guage in the dash to the right of my shift knob. I had to cut a little to make the hole big enough, but it looks nice, factory allmost. I'll post pics someday if I ever feel like it.
There are four wires coming out of the guage(the one I have anyway), ground, light, power, and o2 censor wire.
I connected the ground wire to the main ground on my engine.
There's an opening in the firewall right above your ecu. I put a droplight in the engine bay so I could see any openings in the firewall. Run a clothshanger wire through the opening. Tape the guage wire to the hanger wire and pull it through. Do this with all the wires except the power wire.
For the light wire I pulled it through the firewall and used a butt connector to tap into my side marker light(you might want to run this wire to a headlight. My sidemarkers are wired to my headlights, they're on all the time.)
For the o2 censor wire run it through the fierwall, put loom around it and run it down beside your o2 censor wiring harness all the way to your cat-converter. There are 2 o2 censors under your car. Primary(located at the bottom of the header). And secondary (located in the cat). The one you need to tap into is the secondary. There are 4 wires coming out of this o2 censor, 2white, 1grey, and 1black. Use a butt conector and tap into the BLACK wire. Autometer will tell you its the green one in the primary censor, but it's the black one in the secondary censor.
And finally, using a butt connector, I connected my power wire to the remote wire in the back of my factory head unit. You need to wire it up so it only comes on when the car is on.
I installed the guage in the dash to the right of my shift knob. I had to cut a little to make the hole big enough, but it looks nice, factory allmost. I'll post pics someday if I ever feel like it.