Current Classifieds

Wiring diagram Ignition switch 72 2.0 4 speed pinto wagon
Date: 12/31/2017 11:14 pm
NEED 77/78 MUSTANG II Left Motor Mount
Date: 04/15/2017 05:14 pm
71/72 Pinto front end bushing kit
Date: 02/05/2017 09:45 am
'76 Wagon Driver Side Rear Interior Panel
Date: 11/11/2019 04:49 pm
1970-1973 British 4 Speed Manual; Parts or Whole
Date: 03/17/2019 03:57 am
need intake for oval port 2.3l
Date: 08/22/2018 09:23 am
1977 Front Sump 2.3 Oil Pan
Date: 09/14/2018 11:42 pm
2.0 Cyl Head1973
Date: 11/29/2018 12:51 pm
Need seals Pinto Wagon
Date: 02/16/2017 05:09 pm
Parts Parts Parts
Date: 09/08/2018 03:13 pm
Looking for Passenger side Inner Fender Apron
Date: 10/28/2018 08:45 am
1978 ford pinto carb
Date: 02/04/2018 06:09 pm

« previous next »
Pages: [1]   Go Down

Author Topic: Idle air control signal, turbo swap, a/c  (Read 1617 times)

0 Members and 1 Guest are viewing this topic.

Offline denmach1

  • Pinto Member
  • **
  • Posts: 25
  • FeedBack: +0/-0
  • Another Pinto Driver

    • Total Badges: 2
    Badges: (View All)
    Topic Starter Windows User
Idle air control signal, turbo swap, a/c
« on: August 18, 2014, 05:36:59 PM »
I am in the middle of a turbo swap into my 77 Cruisin Wagon using a LA2 ecu. I am also installing a vintage air system. Does anyone know what type of signal I need to send to the ecu to adjust the idling when the compressor turns on? (voltage? ohms? which pin? etc...) Any help is greatly appreciated.
Logged

Offline Wittsend

  • Pinto Master
  • *****
  • Posts: 2499
  • FeedBack: +241/-0

    • Total Badges: 8
    Badges: (View All)
    Tenth year Anniversary Mobile User Topic Starter Poll Voter 1000 Posts Linux User Windows User Fifth year Anniversary
Re: Idle air control signal, turbo swap, a/c
« Reply #1 on: August 18, 2014, 06:58:49 PM »
As best I can recall an LA-2 and and LA-3 are direct swap ECU's. My Pin Out for an LA-3 shows:

 10 = A/C clutch - A/C input

54 = WAC  WOT (wide open throttle) A/C cutoff

There were also two fan control signals one of which might be relevant to the A/C:

52 = HEDF Highspeed Electro-Drive Fan

55 = EDF    Electro-Drive Fan (low speed)

Hope this helps. At the moment I don't have the "type" of signal sent only where they are going/coming from. Are you using the factory relay box?
Logged

Offline denmach1

  • Pinto Member
  • **
  • Posts: 25
  • FeedBack: +0/-0
  • Another Pinto Driver

    • Total Badges: 2
    Badges: (View All)
    Topic Starter Windows User
Re: Idle air control signal, turbo swap, a/c
« Reply #2 on: August 18, 2014, 07:11:54 PM »
Wittsend, thanks. I am using a Vintage air system and its controls. I see the a/c input on pin 10 of my diagram but just not sure what kind of signal to send to it. I can easily send 12v to it when the clutch is engaged but i need confirmation that that is what it needs. I don't want to fry anything
Logged

Offline oldkayaker

  • Pinto Master
  • *****
  • Posts: 758
  • FeedBack: +114/-0
  • Gender: Male

    • Total Badges: 5
    Badges: (View All)
    Topic Starter Signature Windows User Tenth year Anniversary Fifth year Anniversary
Re: Idle air control signal, turbo swap, a/c
« Reply #3 on: August 19, 2014, 12:44:42 PM »
The 87TC EVTM shows the LA2 pin #10 connected to the +12V side of the A/C clutch coil.  Note there is one of those surge protection diodes in the wiring harness connected across the A/C clutch coil to moderate the voltage spikes.  I believe this #10 pin is the circuit that opens the IAC a little to maintain idle speed when the A/C is on.
Logged
Jerry J - Jupiter, Florida

Offline denmach1

  • Pinto Member
  • **
  • Posts: 25
  • FeedBack: +0/-0
  • Another Pinto Driver

    • Total Badges: 2
    Badges: (View All)
    Topic Starter Windows User
Re: Idle air control signal, turbo swap, a/c
« Reply #4 on: August 19, 2014, 08:10:40 PM »
Thanks for all of the great info guys! This build would be a real struggle without this site and all of your knowledge and help.
Logged
Pages: [1]   Go Up
« previous next »