C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

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Old May 9, 2012 | 02:05 PM
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armybyrd
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Default Code 23

Ive got an intermitten code 23 on my '88. I just looked it up in my fsm but dont understand everything so Im hoping to get the translation in common terms. Is the MAT sensor the one right under the plenum? Is it only for egr? My egr is blocked off and it should be included in my tune from pcmforless if that matters. Also in the fsm what does CKT mean? Also what symptoms will this code produce?

Last edited by armybyrd; May 9, 2012 at 02:11 PM.
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Old May 9, 2012 | 03:19 PM
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CKT= Circuit

Yes, only used for EGR.

Unplugged or broken wire or broken sensor, will set 23.
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Old May 9, 2012 | 03:36 PM
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I just happened to read one of the older threads debating whether the MAT controlled fuel/spark on MAF cars. Does this mean my tune left the egr code out or is that only to keep a code directly related to egr off? So in other words I should disregard this or would it make a difference having this sensor still in place unplugged?
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Old May 9, 2012 | 05:41 PM
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The MAT SES light is not affected by them turning off the EGR code.
Fix the circuit or deal with the light coming on.
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