Topic: SYS flashing on my dash
in Forum: C4 Electrical
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I have a 91 coupe with the L98 I just got it out from winter storage for a drive and I noticed SYS flashes where my instant average mileage is on my dash console. Can anyone tell me what it is? Thanks
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lanoka harbor, NJ - USA
Joined: 3/22/2009
Posts: 1363
Vette(s): 1990 L-98 white/ red/black leather interior targa top auto
1975 L48 blue/black leather interior t tops auto
after your ride, did you try restarting the car and did it come back on. have had my 90 flash that and as soon as i shut it off and restarted it was gone. i take it as it misread something and came on and then restarting reset it.
on my 90 and i am sure yours would be the same, when you put it in the diagnostic mode that where the codes show up. one of the categories is system but i can never seem to find any info on it. wonder if it is for dealers only.let us know if you find out anything.
the dynamic duo
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Duncanville, TX - USA
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Vette(s): 1985 Coupe-L98/Auto,Bright Red/Carmine.
1974 Coupe-L48/4speed, Medium Red Metallic/Black Deluxe.
A "SYS" message has to do with communication error, I believe.
Happens sometimes when they sit for a while, or if the battery voltage gets low.
To display CCM Fault Codes, select the Display Codes mode by pressing and holding down the "TRIP/ODO" button until "1.1" appears in the Trip Monitor area of the cluster. Then, press the "ENG/MET" button to display the first code. Continue pressing the "ENG/MET" button to display additional CCM codes, until the End-Of-Information indicator ("---") is displayed in the speedometer. A "C12" indicates no stored codes for the CCM.Adams' Apple 2011-03-03 06:05:20
Happens sometimes when they sit for a while, or if the battery voltage gets low.
To display CCM Fault Codes, select the Display Codes mode by pressing and holding down the "TRIP/ODO" button until "1.1" appears in the Trip Monitor area of the cluster. Then, press the "ENG/MET" button to display the first code. Continue pressing the "ENG/MET" button to display additional CCM codes, until the End-Of-Information indicator ("---") is displayed in the speedometer. A "C12" indicates no stored codes for the CCM.
hth
Joel Adams 
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Duncanville, TX - USA
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Vette(s): 1985 Coupe-L98/Auto,Bright Red/Carmine.
1974 Coupe-L48/4speed, Medium Red Metallic/Black Deluxe.
Well...that's not good! Your CCM/BCM may have a problem...
Lemmie do a little research....
Joel Adams
My Link
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"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
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lanoka harbor, NJ - USA
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Vette(s): 1990 L-98 white/ red/black leather interior targa top auto
1975 L48 blue/black leather interior t tops auto
i tried that on my 90 and it didn't work. maybe you have the magic finger, joel.
the dynamic duo
c3vr life member #97
I just had this issue with my 1993. CCM's almost NEVER need replaced. It is usually always the ECM. If the sys is flashing, there should be a code in there. Mine was unable to be cleared and car would not stay running. Once the ECM was replaced, it has been perfect!!! Problem is getting an ECM for a 1992/1993. GM is now remanufacturing ECM's to fit! I got one from the dealer and it is warranted for 2 years.
in Forum: C4 Electrical
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