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| kkperf | SYS light- what is it | ||
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Guru Newb
 
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Driving my 94 the other day and the SYS kept flashing beside the speedometer- what is it and can I pull a code? I have a Snap On and Tech II scan tool but could not find anything there?
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Posted on: 2015/5/4 17:12
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| TommyT-Bone | Re: SYS light- what is it | ||
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Chair-man of the bored
 
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Posted on: 2015/5/4 17:19
Edited by TommyT-Bone on 2015/5/8 4:31:58 Edited by TommyT-Bone on 2015/5/8 4:33:06 |
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| TommyT-Bone | Re: SYS light- what is it | ||
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Chair-man of the bored
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Posted on: 2015/5/4 17:24
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| pianoguy | Re: SYS light- what is it | ||
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Guru Emeritus
 
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Check your battery, could be going bad.
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Posted on: 2015/5/4 18:56
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1996 LT4 �Before you criticize someone, you should walk a mile in their shoes. That way when you criticize them, you are a mile away from them and you have their shoes.�- Jack Handey |
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| Matatk | Re: SYS light- what is it | ||
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Webmaster
 
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Do you have an aftermarket stereo?
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Posted on: 2015/5/5 0:34
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2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
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| kkperf | Re: SYS light- what is it | ||
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Guru Newb
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Factory Bose. I noticed the SYS light was flashing and i cycled thru the gauges and saw 14.4 volts.
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Posted on: 2015/5/5 1:06
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| bogus | Re: SYS light- what is it | ||
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Grand Imperial Pooh-Bah
 
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The SYS can flash for any number of reasons... Battery voltage being one... a bad ground for the IP or CCM...
If you ever see the SYS light on AND the SES light on at the same time, drive straight home and do not shut off the engine until the car is parked! This means, more then likely, that the PCM has lost comms with the CCM. And when that happens, the car will not restart. |
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Posted on: 2015/5/5 2:05
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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| TommyT-Bone | Re: SYS light- what is it | ||
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Chair-man of the bored
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I got a 1. C41 H41 --- 4. Err 1.0 in the speedometer code box but no service messages on the DIC. |
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Posted on: 2015/5/6 21:30
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| TommyT-Bone | Re: SYS light- what is it | ||
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Chair-man of the bored
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Quote:
What are UARTs? |
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Posted on: 2015/5/6 21:32
Edited by TommyT-Bone on 2015/5/8 4:41:22 |
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| Woodstock | Re: SYS light- what is it | ||
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Senior Guru
 
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It's most likely an easy fix for you and your L98.
99% your ECM is toast. Since your 90 and 91 use the same ECM, just switch it over and most likely the code is gone and culprit found. |
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Posted on: 2015/5/7 21:47
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91 convertible |
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| TommyT-Bone | Re: SYS light- what is it | ||
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Chair-man of the bored
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Quote:
Here's the problem. The 91 is a Crate 383 stroker with a ProCharger supercharger and a MSD ignition box. Still a plug and play? Just change the card with it? I'm suddenly suspect of the battery by the way. I'm gonna have to have it tested even though it's supposed to be brand new, it isn't acting right. Also I charged the car up to capacity the other day. It was dead within a week. The shop looked for possible drains/breaks and checked the grounds. No issues found and it maintained a charge at the shop. I'm willing to look for and pick up an ECM and keep it as a spare if it's not the culprit. Time will tell and I'll post any conclusions. |
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Posted on: 2015/5/8 4:05
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| TommyT-Bone | Re: SYS light- what is it | ||
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Chair-man of the bored
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http://www.corvsport.com/Corvette/C4/ ... C4_1991_CommonIssues.html
" ELECTRICAL ISSUES ELECTRONIC CONTROL UNIT (ECU) •The electronic control unit (ECU) is prone to failure, causing vehicle to stall during operation. Failure of the ECU can also prevent the Corvette from starting." Certainly gaining traction here. I might just have to throw a part at it. Going to go check the p/n in the morning and see about rounding one up. Once again, thanks, Axel. |
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Posted on: 2015/5/8 4:28
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| Woodstock | Re: SYS light- what is it | ||
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Senior Guru
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I am pretty certain you just have a different chip in your 383, which is removable. Loosen the 3 10mm nuts holding the ECM in the bracket and turn it around. You'll see a cover held by 4x 1/4° screws. Underneath that cover is the memcal/chip, that you just swap over and you are ready to try with the ECM you already have.
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Posted on: 2015/5/8 6:58
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91 convertible |
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| bogus | Re: SYS light- what is it | ||
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Grand Imperial Pooh-Bah
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Quote:
Universal Asynchronous Receive/Transmit. They are communications chips. |
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Posted on: 2015/5/8 20:49
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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| TommyT-Bone | Re: SYS light- what is it | ||
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Chair-man of the bored
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Changed out the ecm with a used unit and swapped memcal/chip. No changes. Same ......... |
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Posted on: 2015/5/11 21:36
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| Woodstock | Re: SYS light- what is it | ||
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Senior Guru
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Do you still got code 41?
I'd take a look at the fuses, especially ECM and CCM. No juice no joy. If it's not a known good ECM, try your other ECM. You know how easy the swap is. Good luck. |
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Posted on: 2015/5/12 10:15
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91 convertible |
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| TommyT-Bone | Re: SYS light- what is it | ||
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Chair-man of the bored
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I'll recheck the fuses and do as you suggest. It's worth a shot. |
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Posted on: 2015/5/12 13:15
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| TommyT-Bone | Re: SYS light- what is it | ||
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Chair-man of the bored
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Took the ECM from the 90 and transplanted the chip. Same negative results. Fuses were OK. It's going on the flatbed soon. Could well be CCM related. I'll report back with future findings. |
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Posted on: 2015/5/12 15:06
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| Woodstock | Re: SYS light- what is it | ||
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Senior Guru
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Try the 90 ECM with the 90 Chip.
Once I had a chip that didn't burn right and I got a code 41. With a stock chip the 383 should run richer. For a start and short idle action you should be safe. |
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Posted on: 2015/5/12 16:32
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91 convertible |
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| TommyT-Bone | Re: SYS light- what is it | ||
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Chair-man of the bored
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Here is the latest. The ECM and CCM were both showing power. My current mechanic called my old mechanic, Kent, and Kent said he has never had to replace a CCM for failure. Somehow the shop ended up finding a fusible link that was hanging by a thread. This link I was told has to do with the injectors and fuel pump receiving power from the PCM. I'll update further when it's up and running. |
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Posted on: 2015/5/27 20:11
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