A/C control

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Mar 14, 2004 | 01:09 PM

eric305TPI

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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 :(

A/C control

Does anyone know if the 730 ECM is capable of controlling the A/C compressor relay as the 727 ECM is. If so which pin is for the control to the relay.

Mar 14, 2004 | 01:32 PM

RBob

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From: Chasing Electrons

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Re: A/C control

Quote:

Originally posted by eric305TPI
Does anyone know if the 730 ECM is capable of controlling the A/C compressor relay as the 727 ECM is. If so which pin is for the control to the relay.

$8D mask as such the Corvette uses? D3 is A/C request, F3 is A/C relay control.

RBob.

Mar 14, 2004 | 05:46 PM

eric305TPI

Thread Starter

TGO Supporter

Joined: Oct 2003

Posts: 302

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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 :(

Yes I'm refering to the $8D mask.

Mar 14, 2004 | 06:00 PM

RBob

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From: Chasing Electrons

Car: check

Engine: check

Transmission: check

Quote:

Originally posted by eric305TPI
Yes I'm refering to the $8D mask.

The pins I posted above are for the '730 ECM. May or may not need to tweak the calibration parameters to have the A/C operate. All depends upon the BCC used. Don't know of any other reason it won't work (besides a little re-wiring).

RBob.

Mar 14, 2004 | 09:36 PM

eric305TPI

Thread Starter

TGO Supporter

Joined: Oct 2003

Posts: 302

Likes: 0

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 :(

Currently the A/C on input is on pin C9. Does this need to be moved to D3 or does the request circuit need to be added.

Mar 15, 2004 | 08:41 AM

RBob

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From: Chasing Electrons

Car: check

Engine: check

Transmission: check

Quote:

Originally posted by eric305TPI
Currently the A/C on input is on pin C9. Does this need to be moved to D3 or does the request circuit need to be added.

That is a status input. It lets the ECM know that the A/C compressor is active. Allows the ECM to control the idle & fans relative to the A/C compressor being engaged.

RBob.