Fan Control
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From: Houston / The Woodlands, TX
Car: 82 ElCamino, looking for a 3rd gen
Engine: 305 TPI(427SB in progress) 730 $8D
Transmission: THM350 (Getting a 4L80E soon)
Axle/Gears: 10 Bolt w/ 2.43 gears :(
Fan Control
Is the 730 ECM capable of controlling 2 fans independently? If so what pin does the second relay need to be connected to? Also what pin does the A/C high side pressure(fan control not high pressure cut out)switch go on or should I wire that directly to the fan control relay.
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From: Chasing Electrons
Car: check
Engine: check
Transmission: check
Re: Fan Control
Originally posted by eric305TPI
Is the 730 ECM capable of controlling 2 fans independently? If so what pin does the second relay need to be connected to? Also what pin does the A/C high side pressure(fan control not high pressure cut out)switch go on or should I wire that directly to the fan control relay.
Is the 730 ECM capable of controlling 2 fans independently? If so what pin does the second relay need to be connected to? Also what pin does the A/C high side pressure(fan control not high pressure cut out)switch go on or should I wire that directly to the fan control relay.
Pin E8 is the primary fan control (stock as used in F body's)
Pin F8 is the secondary fan control (not used in F body's, but in use in Y body's).
Pin D12 is the A/C status input for fan control (stock as used in F body's).
Pin C9 is an A/C compressor signal to the ECM. Not sure what the ECM uses it for, probably IAC idle control.
RBob.
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