PINTO CAR CLUB of AMERICA
Welcome to FordPinto.com, The home of the PCCA => General Help- Ask the Experts... => Topic started by: denmach1 on August 18, 2014, 05:36:59 PM
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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.
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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?
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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
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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.
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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.