RX7Club.com


Go Back   RX7Club.com > Tech and Performance > Engine Management Forum > Power FC Forum
Register Forgot Password?
Register Photos FAQ Members Search Today's Posts Mark Forums Read Vendor DirectoryUsed Cars Garage
Welcome to RX7Club.com

Reply
 
 
 
 
LinkBack Thread Tools Search this Thread Display Modes
Old 05-02-12, 11:35 PM   #1
Pharmaceutical 7
5 Year Member
 
linnadawg's Avatar
 
Trader Score: (13)

Join Date: Feb 2009
Location: Fresno, Ca.
Posts: 377
https://www.facebook.com/micah.vanbuuren
CA Air conditioning FIX

My A/C would only work on speed 1 and sometimes 2. I followed these instructions. R12 feels amazing.



Category Five Motorsports

Power-FC A/C MOD

This mod will enable your air conditioner to work when installing a Power FC in FD3s. This will also fix the problem of the a/c not working on one or more of the fan speeds.

The reason the a/c does not come on is because as the car ages, the ground signal going to the ECUís (wire 1E) is receiving a fuzzy ground signal. Some cars have no problem with the signal, but some do; the last FD I worked on the a/c did not work on any speed. My mod will interrupt the signal going into the Power FC and redirect it through a simple Bosch relay. This will also let the Power FC still control the IAC and switch the a/c off at wide open throttle.

Locate wire 1E (Violet wire) - it is the third wire from the end on connector one. Cut the wire 2Ē from ECU. On the harness side you will hook 1E to (86). On terminal (85) on the relay will go to ignition +. Terminal (87) will go to 1E that was cut on the Power FC side. Terminal (30) will go straight to chassis ground. Now when your a/c is turned on, it will receive a nice healthy ground. If you have any questions contact me via email.

Freddie@catfivemotorsports.net
linnadawg is offline   Reply With Quote
Old 05-21-12, 07:34 PM   #2
To each there own.
 
D.Adams's Avatar
 
Trader Score: (0)

Join Date: Apr 2012
Location: Lake Havasu City, AZ
Posts: 75
I just did this and it worked . I now have ac on all settings .
__________________
Ideas are more powerful than guns. We would not let our enemies have guns, why should we let them have ideas.
D.Adams is offline   Reply With Quote
Old 05-27-12, 11:51 PM   #3
Rotorite
 
Trader Score: (0)

Join Date: Mar 2012
Location: Oregon
Posts: 54
Aveadavin
Sweet !
93autoFdTO4z is offline   Reply With Quote
Old 09-02-12, 11:15 AM   #4
All out Freak!
 
Trader Score: (4)

Join Date: Sep 2011
Location: Miami
Posts: 2,452
have you ever encountered this . I'm trying to figure out if this is the power FC , or some other underlying issue

my fans work at all speeds . BUT my AC controls DO NOT WORK I cant switch hhere the air comeso ut , I cant turn on the AC nothing lights up when I press the AC button , or the recirc button , nothing works I thought it was a faulty control unit so I tried another one form a friend that was working and nothing did hte same thing . its as iff its not even recieving any power , the hazard lights work , and the cluster dimmer works . the fan speed works , but the temp , nor the directional flow controls work .

I'm wondering if this is caused by the Power FC . or if this is another underlying issue ..

I've checked all the fuses they seem to be good . I'm going to check the relay hope the relay has something to do with the controls .

Oh also I tested all the equipment manually using a test light nad they ALL OPerate
so its not that they are broken
__________________
Patience is a Virtue I Don't have time for!
Build Or Die Trying
Tem120 is offline   Reply With Quote
Old 09-02-12, 12:18 PM   #5
All out Freak!
 
Trader Score: (4)

Join Date: Sep 2011
Location: Miami
Posts: 2,452
Also my little fuse cover lost the label , I thought I read one fuse that said hazard /ac in whats left of the paper . But Now I'm doubtful . as I'm reading the FSM , Wiring diagram , Z68 , it says that the rear Wiper fuse is what feeds power to the AC controls ? is this correct ?
__________________
Patience is a Virtue I Don't have time for!
Build Or Die Trying
Tem120 is offline   Reply With Quote
Old 09-02-12, 03:38 PM   #6
All out Freak!
 
Trader Score: (4)

Join Date: Sep 2011
Location: Miami
Posts: 2,452
I got it figured out I just spammed this thread for nothing sorry!
__________________
Patience is a Virtue I Don't have time for!
Build Or Die Trying
Tem120 is offline   Reply With Quote
Old 09-08-12, 04:10 PM   #7
Insane Burnout
10 Year Member
 
LongRX7's Avatar
 
Trader Score: (10)

Join Date: Mar 2001
Location: Yukon, OK USA
Posts: 422
What/which bosch relay and any pics?
__________________
Long Nguyen
1993 Mazda RX-7 VR Vintage Red(mostly)
1993 Mazda RX-7 R1 CYM
2005 Cadillac Escalade
LongRX7 is offline   Reply With Quote
Old 09-08-12, 04:28 PM   #8
*BOV sound*
10 Year Member
 
Radial GT's Avatar
 
Trader Score: (15)

Join Date: Feb 2001
Location: Northern Minnesota
Posts: 1,143
Those relays are all the same.
__________________
93 Black Touring; FMIC, NS Twins, Power FC, Datalogit, Wideband O2, and Simplicity
88 GTU Complete Turbo swap w/ LTX-8 (Sold)
86 GXL, Ported (Sold)
86 Sport, Ported (RIP)
Radial GT is offline   Reply With Quote
Old 09-13-12, 01:45 AM   #9
Insane Burnout
10 Year Member
 
LongRX7's Avatar
 
Trader Score: (10)

Join Date: Mar 2001
Location: Yukon, OK USA
Posts: 422
"On terminal (85) on the relay will go to ignition +." Is there a certain location or color I'm looking for? Just want to confirm and clarify. Thanks. Would be nice to have all 4 AC settings, than just setting 1, lol. Thanks again.
__________________
Long Nguyen
1993 Mazda RX-7 VR Vintage Red(mostly)
1993 Mazda RX-7 R1 CYM
2005 Cadillac Escalade
LongRX7 is offline   Reply With Quote
Old 11-13-12, 11:51 PM   #10
Pharmaceutical 7
5 Year Member
 
linnadawg's Avatar
 
Trader Score: (13)

Join Date: Feb 2009
Location: Fresno, Ca.
Posts: 377
https://www.facebook.com/micah.vanbuuren
I use one of those Greddy turbo timer harnesses that have a few wires hanging out. One is switched ignition that I use for my water injection, the other is Hot and I used that for the relay.
linnadawg is offline   Reply With Quote
Old 06-23-13, 12:53 PM   #11
Exhaust Leak
 
Trader Score: (0)

Join Date: May 2012
Posts: 24
I've got these issues with my 93. However, I do not have Power FC. Would this fix still be implemented? If so, does anyone know a thread with more instructions or pic walk through?
Mynticelx is offline   Reply With Quote
Old 06-23-13, 10:54 PM   #12
Gang Of Fatty
10 Year Member
 
cewrx7r1's Avatar
 
Trader Score: (2)

Join Date: Feb 2001
Location: In A Blue Police Box
Posts: 7,144
Here it is.
Attached Files
File Type: doc AC - PFC - Fix 1.doc (85.5 KB, 129 views)
__________________


Save a starving person, send more BBQ to the middle east.
cewrx7r1 is offline   Reply With Quote
Old 06-28-13, 06:50 PM   #13
Exhaust Leak
 
gschott's Avatar
 
Trader Score: (2)

Join Date: Nov 2010
Location: Fredericksburg VA
Posts: 23
pictures?
gschott is offline   Reply With Quote
Old 06-29-13, 05:26 PM   #14
Gang Of Fatty
10 Year Member
 
cewrx7r1's Avatar
 
Trader Score: (2)

Join Date: Feb 2001
Location: In A Blue Police Box
Posts: 7,144
This is not kinder garden or grade school.
That is what the FSM is for, to find where things are and how they work to some degree.

You either have the knack or pay someone to do it.
__________________


Save a starving person, send more BBQ to the middle east.
cewrx7r1 is offline   Reply With Quote
Old 06-30-13, 08:04 AM   #15
Exhaust Leak
 
Trader Score: (0)

Join Date: May 2012
Posts: 24
As mentioned in my original question - these instructions all reference having a Power FC mod.. which I do not have. Hence why I am looking for more details because these instructions are very specific to the wiring of the PFC. While I have the same symptoms - these might not provide the same resolution if they are specific to PFC issues... so no, I am not asking to be taught like a grade schooler, simply asking people broader questions to clarify the original op's posting. Thanks
Mynticelx is offline   Reply With Quote
Old 07-01-13, 02:31 PM   #16
Gang Of Fatty
10 Year Member
 
cewrx7r1's Avatar
 
Trader Score: (2)

Join Date: Feb 2001
Location: In A Blue Police Box
Posts: 7,144
Applies to the stock ecu the same as the PFC. The wiring change will relate to any ecu that uses the AC switch and fan speed in the same way as stock, and controls the idle speed.
Only would be different if the AC was greatly modified over stock.

The AC could be wired to not even connect to the ECU as the ecu connection is only for ISC control.

If you understand basic DC circuits and read the manuals for the AC, then you would understand.
If you do not know electronics or basic wiring, do not try it alone.
__________________


Save a starving person, send more BBQ to the middle east.
cewrx7r1 is offline   Reply With Quote
Old 07-04-13, 08:30 PM   #17
*BOV sound*
10 Year Member
 
Radial GT's Avatar
 
Trader Score: (15)

Join Date: Feb 2001
Location: Northern Minnesota
Posts: 1,143
I just follow the op's instructions and it worked perfect for me. My pin 1E was black with a yellow stripe on my 93 touring, but it worked just the same. I had a/c in fan speed 1 only before the mod. Now after the addition of the relay all 4 work great. Very good stuff!
__________________
93 Black Touring; FMIC, NS Twins, Power FC, Datalogit, Wideband O2, and Simplicity
88 GTU Complete Turbo swap w/ LTX-8 (Sold)
86 GXL, Ported (Sold)
86 Sport, Ported (RIP)
Radial GT is offline   Reply With Quote
Old 08-24-13, 01:10 PM   #18
Exhaust Leak
 
Trader Score: (0)

Join Date: May 2012
Posts: 24
I performed this mod and the AC is working on all 4 settings. Still running into some issues that I don't think are necessarily tied to PFC. I will be posting further about this once I get them well documented.
Mynticelx is offline   Reply With Quote
Old 11-29-13, 01:56 AM   #19
Dirty
10 Year Member
 
allenhah's Avatar
 
Trader Score: (3)

Join Date: Jul 2001
Location: Austin
Posts: 764
Send a message via ICQ to allenhah Send a message via AIM to allenhah
I am considering doing this mod but after thinking about the logic of the relay, I'm wondering something: Why not just splice the 1E wire directly to a clean chassis ground rather than have it switch to the chassis ground only when the ignition switch is turned on?

Maybe I'm missing something in the logic? With this relay mod, when the ignition switch is off, wire 1E coming out of PFC is disconnected from the ground, and when the ignition is turned on, wire 1E is then connected to the chassis ground. Without the relay mod, wire 1E is always connected to a chassis ground (albeit a fuzzy one).

So wouldn't the more logical solution be to simply splice or cut and connect wire 1E coming out of the PFC directly to a clean chassis ground?
allenhah is offline   Reply With Quote
Old 11-29-13, 06:34 PM   #20
Gang Of Fatty
10 Year Member
 
cewrx7r1's Avatar
 
Trader Score: (2)

Join Date: Feb 2001
Location: In A Blue Police Box
Posts: 7,144
Quote:
Originally Posted by allenhah View Post
I am considering doing this mod but after thinking about the logic of the relay, I'm wondering something: Why not just splice the 1E wire directly to a clean chassis ground rather than have it switch to the chassis ground only when the ignition switch is turned on?

Maybe I'm missing something in the logic? With this relay mod, when the ignition switch is off, wire 1E coming out of PFC is disconnected from the ground, and when the ignition is turned on, wire 1E is then connected to the chassis ground. Without the relay mod, wire 1E is always connected to a chassis ground (albeit a fuzzy one).

So wouldn't the more logical solution be to simply splice or cut and connect wire 1E coming out of the PFC directly to a clean chassis ground?
Yes you are missing something, not understanding how the circuit works!
Go back and study Freddy's mod, and also look at the manuals FSM Section F and the Wiring manual for the AC.

Your way is fine if you want your AC running 100% of the time.

HAHAHAHA!
__________________


Save a starving person, send more BBQ to the middle east.
cewrx7r1 is offline   Reply With Quote
Old 11-30-13, 01:56 AM   #21
Dirty
10 Year Member
 
allenhah's Avatar
 
Trader Score: (3)

Join Date: Jul 2001
Location: Austin
Posts: 764
Send a message via ICQ to allenhah Send a message via AIM to allenhah
Ah - I see what you're saying. I was thinking that the 1E on the harness side was going straight to chassis ground, but it actually is only switched to ground when a signal is activated to turn on the AC compressor through a myriad of circuits.

Thanks for the clarification!
allenhah is offline   Reply With Quote
Old 04-28-14, 02:26 PM   #22
Exhaust Leak
5 Year Member
 
JDRX-7's Avatar
 
Trader Score: (1)

Join Date: Oct 2007
Location: Hesperia, Ca.
Posts: 44
Fan Speed Fix

I concur with previous posts, just follow the directions as posted. Took about 1 1/2hrs.

Thanks much Freddie.
JDRX-7 is offline   Reply With Quote
Old 04-28-14, 02:26 PM
RX7Club
Mazda RX7




Paid Advertisement


 
 
 
Reply

Tags
ac, air, car, conditioner, fc, fd3s, iac, longrx7, mod, oklahoma, power, rx7, rx7club, speed, working, yukon

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On


All times are GMT -5. The time now is 04:14 PM.
All content Copyright © 2007 by Internet Brands, Inc.

Contacts

SEO by vBSEO ©2010, Crawlability, Inc.