ECC F'D Up - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 06-22-2005, 09:21 PM   #1
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Default ECC F'D Up

On the way to Mankato, 90* day....no A/C.....Well that'* f'n specatacular. Compressor won't engage, also no codes and the system is charged. Now I'm scratching my head......Dig the scan tool out of the truck and hook it up. Go and check out the live stats......A/C Clutch : Disengaged....well we know that. Now click over to the A/C REQUSTED: Not Requested, even though the A/C system is showing active on the ECC??

WTF Is the deal there?
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Old 06-22-2005, 09:35 PM   #2
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Then there is a problem somewhere... I think it works like this, when you turn on the AC via the ECC, the ECC sends a signal to the PCM, the PCM turns on the AC compressor clutch relay, then from there the system will request the fans to turn on, low speed first followed by high speed ususally, at this time the PCM should be seeing the head pressure, may be listed as actuall pressure, or Normal or high<---- This is what it should say if the compresor is on and the PCM sees the pressure in the system...

If the PCM is not seeing the request, that makes me wonder about the ECC unit itself...

I'm not an AC guy so please don't quote me on this...

Anybody have some thoughts here?

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Old 06-23-2005, 03:00 AM   #3
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Quote:
Originally Posted by jr's3800
Then there is a problem somewhere... I think it works like this, when you turn on the AC via the ECC, the ECC sends a signal to the PCM, the PCM turns on the AC compressor clutch relay, then from there the system will request the fans to turn on, low speed first followed by high speed ususally, at this time the PCM should be seeing the head pressure, may be listed as actuall pressure, or Normal or high<---- This is what it should say if the compresor is on and the PCM sees the pressure in the system...

If the PCM is not seeing the request, that makes me wonder about the ECC unit itself...

I'm not an AC guy so please don't quote me on this...

Anybody have some thoughts here?
Guess not too many people have any thoughts. But I think you're theory is true...seeing how my 95 shouldn't be able to have the ECC read with just a simple scanner. Plus I have no flashing temp.

Maybe next time I'm at Gordy'* should I try and swap out the ECC with his? A known good unit?
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Old 06-23-2005, 06:44 AM   #4
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AC clutch relay is shot
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Old 06-23-2005, 07:21 AM   #5
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My idea is sarcastic....so I'll keep it to myself.

You're charged up...what about the pressure switch?
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Old 06-23-2005, 09:25 AM   #6
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My idea is sarcastic....so I'll keep it to myself.

You're charged up...what about the pressure switch?
Pressure swtich would or should cause a code in the system and make it flash the temp at me?

Relay like Mark said sounds like a good start....
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Old 06-23-2005, 10:44 AM   #7
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If Gordy has a 95 service manual I highly suggest that you read it when you have the time....

You can get another relay for the AC Compressor clutch... I forget what it costs... Had one go bad on my 91.. ECM showed that I was requesting AC ON tho...

What confuses me is that your PCM is not seeing that you have requested the AC ON... It should, and right after that the compressor clutch should cycle on....

Let us know what happens

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Old 06-23-2005, 08:17 PM   #8
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And go figure it'* always two days before the hot damned day of the year......
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Old 06-23-2005, 08:41 PM   #9
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Quote:
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And go figure it'* always two days before the hot damned day of the year......
Murphy'* law.
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Old 06-23-2005, 08:50 PM   #10
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Quote:
Originally Posted by LakevilleSSEi
And go figure it'* always two days before the hot damned day of the year......
Murphy'* law.
Reminding me that yes.....God Hates me.......lol

I'm gonna try a different ECC unit first.....And then work from there. Where is that relay located at anyways?
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