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Post Info TOPIC: Code 23
Donutboy97


Moderator-Monte Hunter Lead Investigator

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Date: Jul 11, 2010
Code 23
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So i replaced the starter and to alternator and now I'm throwing a code 23: Mixture Control Solenoid - Open circuit or short to ground in the mixture control circuit; defective MCS; defective ECM - if the MCS is shorted to ground, the CEM may have been damaged.

now I know I relocated one ground which was on the alternator bracked that bolts to the block, does any one know off hand if thats the MCS ground? (I haven;t traced the wires). Anyone know how to test/check the MCS???

Edit: the car is running the same as before, but it does feel like it stalls when I stop the car and it drops from 1000 rpm to 500.  IT also feels slugish off the line, but thats has been like that for a while now, dont; know if it's related.

-- Edited by Donutboy97 on Sunday 11th of July 2010 09:21:28 AM

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1988 Monte Carlo SS As Shown In November 2011 Super Chevy Magazine with a magnafying glass...
mattthias


Moderator- Monte Hunters Camera Crew

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Date: Jul 11, 2010
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Tim. Tell the wife that there is no fix and get your 383. lol. good luck on the fix.

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Donutboy97


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Date: Jul 11, 2010
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yeah if I keep looseing bolts to the block, I will have no choice lmao


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twomanymontes


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Date: Jul 11, 2010
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Tim, that code bascially states the computer is seeing a steady voltage at terminal #18, rather than a pulsed voltage from the solenoid. Does the Mixture control Solenoid click when the key is on/engine off? Check and make sure it's plugged in [top of carb]

According to the schematic I have here, The Ground side of the ECM is the ECM itself, the Power side comes from the ECM IGN fuse, Make sure that fuse didn't just blow. And that green connector that goes to nowhere, make sure that isn't grounded.

I hope it isn't the computer again. But then again it should still be under warranty

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Donutboy97


Moderator-Monte Hunter Lead Investigator

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Date: Jul 11, 2010
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i think i fixed it... the wire/ground that I had to relocate was the cuplrate. I just sanded the area to get a better ground, and so far so good. I still don't understand it all, but what ever lmao

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1988 Monte Carlo SS As Shown In November 2011 Super Chevy Magazine with a magnafying glass...
twomanymontes


Moderator - Monte Hunter Lead Investigator

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Date: Jul 11, 2010
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I just went and looked at my car, that ground wire is one of the 2 main grounds for the ECM and sensors. Glad that fixed it

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Donutboy97


Moderator-Monte Hunter Lead Investigator

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Date: Jul 12, 2010
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twomanymontes wrote:

I just went and looked at my car, that ground wire is one of the 2 main grounds for the ECM and sensors. Glad that fixed it


it did look like a very important ground lmao!!!!

 



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2001 Monte Carlo LS
1988 Monte Carlo SS As Shown In November 2011 Super Chevy Magazine with a magnafying glass...
twomanymontes


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Date: Jul 12, 2010
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If I didn't think it was, I would have driven 2 miles away to look at mine!! LOL!

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Donutboy97


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Date: Jul 24, 2010
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well the issue is back, and the voltage (meter) is down. goes just above the red and up to 13. Just tried checking the ground and that didn;t fix it this time. i'm still thinking it could still be the wire, but i need to follow it back. Anyone have any other thoughts?

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1988 Monte Carlo SS As Shown In November 2011 Super Chevy Magazine with a magnafying glass...
twomanymontes


Moderator - Monte Hunter Lead Investigator

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Date: Jul 24, 2010
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Tim, is it just the gauge or is the battery reading the same voltage? Maybe the voltage regulator in the alternator is starting to go.

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Donutboy97


Moderator-Monte Hunter Lead Investigator

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Date: Jul 24, 2010
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alternator is new, I'll check the bat. voltage

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twomanymontes


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Date: Jul 27, 2010
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any luck Tim??

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Donutboy97


Moderator-Monte Hunter Lead Investigator

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Date: Jul 27, 2010
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yes. My car is a woman and it just had PMS last week. This week it's acting fine, no codes thrown.



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1988 Monte Carlo SS As Shown In November 2011 Super Chevy Magazine with a magnafying glass...
mattthias


Moderator- Monte Hunters Camera Crew

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Date: Jul 28, 2010
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you might pay for that comment tim, lol.

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Donutboy97


Moderator-Monte Hunter Lead Investigator

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Date: Jul 28, 2010
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maybe, maybe not... but I speak the truth biggrin.gif

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