"SYS" Flashing in dash???

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Aug 14, 2007 | 06:43 PM

Ron C!

Thread Starter

Safety Car

Joined: Jan 2000

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From: Orlando FL

"SYS" Flashing in dash???

My son just called, he has "SYS" flashing on the readout where the gas mileage average usually is on his 93. All functions are normal aside from this. Any ideas?

Thanks in advance.

Aug 14, 2007 | 06:50 PM

Ericsvette

Burning Brakes

Joined: Sep 2005

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From: Millbury MA

Same thing has been happening with my '93 since I took it out of storage this last Spring.
The owners manual states that it means something is amiss in the ECM. It seems odd that that's what it could be seeing as everything else seems fine. I've been driving it all summer with no problems.

Last edited by Ericsvette; Aug 14, 2007 at 06:54 PM.

Aug 14, 2007 | 07:11 PM

GSjimbo

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From: Long Beach CA

Happend to me when the battery was low and had just enough juice left to start the motor. Put bat on the the charger and the SYS light went away.

Aug 14, 2007 | 07:23 PM

Ericsvette

Burning Brakes

Joined: Sep 2005

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From: Millbury MA

Quote:

Originally Posted by GSjimbo

Happend to me when the battery was low and had just enough juice left to start the motor. Put bat on the the charger and the SYS light went away.

Hmm, that's interesting. I did have to jump-start my car when it came out of storage. It's a no-name battery that the previous owner put in.
Maybe I'll replace it before I put it away for the winter and see what happens.

Aug 14, 2007 | 07:26 PM

NEVRL8T

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From: Sherwood, Arkansas

SYS usually means there is something electrical amiss.

Aug 14, 2007 | 07:31 PM

Ron C!

Thread Starter

Safety Car

Joined: Jan 2000

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From: Orlando FL

That makes sense, we had to jump the car the other day. Bet it is the battery going south.

Aug 14, 2007 | 07:58 PM

LouisvilleLT4

Drifting

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From: Los Angeles California

For me it was the ECT sensor wiring \/

Aug 14, 2007 | 10:25 PM

jabez

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From: Milpitas ca

Try pulling a code and see what it tells you.

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Aug 15, 2007 | 11:27 AM

aquablue96

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Joined: Jul 2007

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From: Salt Lake City ut

Funny I would find this post today. Picked up mine from the shop yesterday where it was for a week to have the door ajar button replaced, now my "sys" light is also blinking.

Aug 15, 2007 | 11:40 AM

#10

jrp

Le Mans Master

Joined: Sep 2003

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From: Littleton CO

Quote:

Originally Posted by jabez

Try pulling a code and see what it tells you.

The SYS message simply means that a code has been set. Retrieve it to see what the real problem is. It could be one of the suggestions here, or one of many other things that the ECM/CCM controls.

Aug 15, 2007 | 11:41 AM

#11

Canam

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From: Ottawa Ontario

Take the terminals off your battery, wait a few minutes, and rehook them up. Chances are your system will reset and youll be fine.

Aug 15, 2007 | 11:46 AM

#12

zr1fred

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Joined: May 2006

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From: Phoenix Arizona

Quote:

Originally Posted by Canam

Take the terminals off your battery, wait a few minutes, and rehook them up. Chances are your system will reset and youll be fine.

That area is prone to "gremlins". If it comes back, then run the codes.

Aug 15, 2007 | 11:47 AM

#13

aquablue96

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From: Salt Lake City ut

When you guys say
"run codes" is it like the check engine light in other vehicles? Can my auto parts store run the codes?

Aug 15, 2007 | 12:05 PM

#14

jrp

Le Mans Master

Joined: Sep 2003

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From: Littleton CO

Quote:

Originally Posted by aquablue96

When you guys say
"run codes" is it like the check engine light in other vehicles? Can my auto parts store run the codes?

Yes. Each computer module (ECM/CCM/PCM/ABS/etc.) will set a code when it sees something wrong. Your parts store will be able to read them for you.

For our '96s at least, the check engine light will be set when a PCM code is present, and the other modules will use the "SYS" alert. (If I'm remembering correctly from the manual.)

I have noticed that my own code reader only sees the OBDII PCM codes (PXXXX format) for some reason. Since you are seeing the "SYS", you should expect a code in a CXX or HXX format - if you don't get one, then have the store try a better reader/scanner or follow the method to display CCM/ECM codes on the dash. OBDII PCM codes cannot be shown on the dash.

Last edited by jrp; Aug 15, 2007 at 12:09 PM.

Aug 18, 2007 | 04:40 PM

#15

Ericsvette

Burning Brakes

Joined: Sep 2005

Posts: 826

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From: Millbury MA

Quote:

Originally Posted by Canam

Take the terminals off your battery, wait a few minutes, and rehook them up. Chances are your system will reset and youll be fine.

I took the negative battery cable off today for five minutes and what do you know the "SYS" message went away

. I wish I knew it was that easy I've been looking at that dang light flashing all summer. I'm still going to replace the battery before it goes into winter storage though.

Aug 18, 2007 | 05:52 PM

#16

Melting Slicks

Joined: Apr 2000

Posts: 2,408

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From: Bel Air Md

Look here for codes on a 93 http://www.c4guru.com/modules.php?name=electrical
or here is another
http://www.corvettephotographs.com/c4vettes/codes.htm

Aug 18, 2007 | 07:18 PM

#17

jabez

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From: Milpitas ca

Quote:

Originally Posted by aquablue96

When you guys say
"run codes" is it like the check engine light in other vehicles? Can my auto parts store run the codes?

Short PINS A and G (on a 92/93 car) on your ALDL. Then turn your key to on position. The codes if any will pop up on your dash.

Aug 18, 2007 | 08:44 PM

#18

larryfs

Safety Car

Joined: May 2002

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From: Somewhere nowhere

Mine did that with a 1/2 dead battery.

Aug 19, 2007 | 07:49 AM

#19

timmy 93

Instructor

Joined: May 2006

Posts: 174

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From: saginaw michigan

Quote:

Originally Posted by jrp

The SYS message simply means that a code has been set. Retrieve it to see what the real problem is. It could be one of the suggestions here, or one of many other things that the ECM/CCM controls.

Could be several things.Best to check

Sep 14, 2007 | 12:53 AM

#20

KCnoTek

6th Gear

Joined: Aug 2006

Posts: 6

Likes: 0

SYS errors

After having a run-down battery, I also had a flashing "SYS" on my 90 conv, with a Pioneer replacement radio (the Bose was toast when I got it). I found this on the forum...

http://www.corvetteforum.net/c4/dave8476/index4.shtml

I have not disconnected the negative battery lead (reset), confirmed the codes or installed the resistors yet; it just happened today for the first time ever. After giving it a jump and driving around for an hour, it runs fine. The "SYS" is more of a nuisance than anything. Hope this helps...

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