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A/C works with standalone ECU, doesn't work with stock ECU?


turbofonz
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Galant VR-4 org Post #: 1237766 posted 06/05/17 07:50 PM     Remind Me!  Send Private Message   Edit Post      
Is this making sense? Swapping my car from an AEM to ECMlink makes my a/c stop working. Is this pinpointing any specific sensor I should be looking for?

I added this to newbies, because this sounds ridiculous.



Ryan W.
91 TSi AWD - 9 sec stock bottom end and corn fed
91 Galant VR-4 - Summit White - 153/2000
91 Galant VR-4 - Summit White - 490/2000
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Posts: 417 | From: Granby, MA | Member Since: 09/27/06 | IP: (73.149.65.160) | Report this post to a Moderator

thomcasey
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Galant VR-4 org Post #: 1237770 posted 06/06/17 06:02 AM     Remind Me!  Send Private Message   Edit Post      
Pin 65 on the ECU plug(s), A/C Clutch Relay Output seems like a likely candidate



Thom
1991 GVR-4 1025/2000 (PTE 1200's, 16g, DSMLink v3, gm-maf, eagle/ross, .020 over, 272's)

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turbofonz
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Galant VR-4 org Post #: 1237970 posted 06/13/17 10:29 PM     Remind Me!  Send Private Message   Edit Post      
Grounding pin 65 makes the compressor kick on. It's looking like it may be an issue with the dual pressure switch or a/c coolant switch?



Ryan W.
91 TSi AWD - 9 sec stock bottom end and corn fed
91 Galant VR-4 - Summit White - 153/2000
91 Galant VR-4 - Summit White - 490/2000
91 Galant VR-4 - Nile Black - 369/2000
92 Galant VR-4 - Summit White - 255/1000 - [email protected] - sold

Posts: 417 | From: Granby, MA | Member Since: 09/27/06 | IP: (73.149.65.160) | Report this post to a Moderator

FlyingEagle
Doesn't Match Anything


Galant VR-4 org Post #: 1238083 posted 06/17/17 11:06 PM     Remind Me!  Send Private Message   Edit Post      
What function did the AEM have over control of the AC system?

Usually it is simply a trigger for the AC compressor clutch relay, and it could be held back by the factory HI/LOW pressure switch and AC temp sensor.

If it worked before, check to make sure the function coming out of the ECU is correct - IE is there power at the wire leading up to the connector for the AC clutch.

If you manually trigger the clutch (engine off), is the AC pulley magnetized (following confirmation that you have power headed down to the AC clutch connector and assuming a good ground)?

Confirm what pressure you have in the AC system if possible.

A few possible scenarios for you. I think this will be something simple if both ECU's control the same functions .... like a wire is not hooked up properly, etc.



C53A 1 of the ~1500

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turbofonz
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Galant VR-4 org Post #: 1238133 posted 06/22/17 07:19 PM     Remind Me!  Send Private Message   Edit Post   
I really don't know anything about AEM, after doing a head change and the car running like crap, I put ECMlink in because I know it well.

The FSM doesn't give much info for testing the dual pressure switch or the temp sensor, other than checking continuity which they both have. So that is leaving me kind of lost.



Ryan W.
91 TSi AWD - 9 sec stock bottom end and corn fed
91 Galant VR-4 - Summit White - 153/2000
91 Galant VR-4 - Summit White - 490/2000
91 Galant VR-4 - Nile Black - 369/2000
92 Galant VR-4 - Summit White - 255/1000 - [email protected] - sold

Posts: 417 | From: Granby, MA | Member Since: 09/27/06 | IP: (73.149.65.160) | Report this post to a Moderator


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