Power FC Bypassing ECU A/C Control
08-04-06, 05:53 PM
#1
How do I made boost?
Thread Starter
Bypassing ECU A/C Control
OK its really really hot right now and i dont care if the ecu knows the a/c is on or not i just want it to work... so i read you can cut the black/yellow wire and splice it into a violet wire to bypass the ecu a/c control? does anyone know where these wires are? cuz when i look at the ecu i see a few black/yellow wires and no purple... Alternately if anyone knows where these wires are AND how to wire in a relay to ground out the ecu thatd be even better, since this is what i intend to try in the long run.
Thanks,
-Kurt
Step two is to cut the "A/C out wire... (yellow/blue)", and splice it into the A/C in wire (purple). The purple wire is where it's shown in the drawing. Unfortunately, the A/C out wire that's listed as yellow/blue, is actually yellow/black on the harness. To confuse matters even more, the wire next to it is yellow/blue.
OK, so the question becomes- is the drawing pointing to the correct wire, and labeling it the wrong color, or is the color correct, and it's pointing to the wrong location?
Out came the manual, and wiring diagrams. The location that's pointed out by the APEX diagram for "A/C out", is terminal 1L in the Mazda wiring diagram. This is listed by Mazda as "AC relay", and the color is "Y/B". This has to be the correct wire, since it goes to the AC relay. It's also understandable, though unforgivable, that APEX might read Y/B as yellow/blue. In the wiring diagram, Mazda uses B to mean Black, and L to mean Blue. The yellow/blue wire next to the AC location is terminal 1N, which goes to a pressure/mileage switch.
Bottom line is that the car runs, and the AC works. Now I get to start reading all those posts about idle hunting (which it does with a vengeance), and hesitation off idle.
Cheers,
EDIT: Also i've searched and searched, tried all sorts of stuff and so far have gone over a year with no a/c. I have the fan switch re-grounded but that didnt help at all. My a/c works intermitantly with the PFC and perfectly with the stock ecu, i'm sure my switch is just to dirty but i'm really not interested in taking it apart in the heat and the assembly from mazda is rediculously expensive.
Thanks,
-Kurt
Originally Posted by 13brv3
Step two is to cut the "A/C out wire... (yellow/blue)", and splice it into the A/C in wire (purple). The purple wire is where it's shown in the drawing. Unfortunately, the A/C out wire that's listed as yellow/blue, is actually yellow/black on the harness. To confuse matters even more, the wire next to it is yellow/blue.
OK, so the question becomes- is the drawing pointing to the correct wire, and labeling it the wrong color, or is the color correct, and it's pointing to the wrong location?
Out came the manual, and wiring diagrams. The location that's pointed out by the APEX diagram for "A/C out", is terminal 1L in the Mazda wiring diagram. This is listed by Mazda as "AC relay", and the color is "Y/B". This has to be the correct wire, since it goes to the AC relay. It's also understandable, though unforgivable, that APEX might read Y/B as yellow/blue. In the wiring diagram, Mazda uses B to mean Black, and L to mean Blue. The yellow/blue wire next to the AC location is terminal 1N, which goes to a pressure/mileage switch.
Bottom line is that the car runs, and the AC works. Now I get to start reading all those posts about idle hunting (which it does with a vengeance), and hesitation off idle.
Cheers,
Last edited by Bob_760; 08-04-06 at 05:56 PM.
08-05-06, 02:22 AM
#4
How do I made boost?
Thread Starter
A/c!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Allright, so what i did was tap into the purple (violet) wire and run it to a switch (i have a fog light switch waiting for me to get some fog lights so i figured why not) and grounded the switch out. So now when i turn on my a/c and fans and all, click the switch ICE COLD! idle is perfect no more hunting/dieng like when the a/c signal was flaky, this is awesome! best the a/c has ever worked (had idle hunting/stalling problems even on stock ECU)
So... I'm happy
Edit: also my switch is definately DEAD lol, i was reading 3-6v on the wire when the a/c was SUPPOSED to be on... so that just about scratches off the relay idea... i'll figure somthing more permanent out after i get fog lights =)
So... I'm happy
Edit: also my switch is definately DEAD lol, i was reading 3-6v on the wire when the a/c was SUPPOSED to be on... so that just about scratches off the relay idea... i'll figure somthing more permanent out after i get fog lights =)
Last edited by Bob_760; 08-05-06 at 02:28 AM.
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