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Looks like that sys error can come on for just about anything. My 94 had that light on since I bought it a year ago. Last week the trip monitor to right side of dash for all fuel switches, ilumination light would go on and off intermitenly. Friday I found the problem. a four prong plug was loose behind it.
Fix- remove 4 screws around speedomiter bezel and loosen.Reach up behind trip monitor and push plug back in. Next day I see sys error no longer there.
 

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Looks like that sys error can come on for just about anything.
Your car has the CCM that integrates and monitors many functions , non engine related
Will even throw a code if if see the wrong voltage on the radio lighting circuit
 
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