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90 ex S light on tried pulling code but no luck

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    #1

    90 ex S light on tried pulling code but no luck

    S light always on car feels sluggish from start and does not shift. I reset the ecu and threw a jumper and CEL light and sport light dont blink they just stay on. the CEL light turns off when jumper removed.
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    #2
    Unless there's a wiring problem somewhere, a solid CEL or S light usually indicates a bad computer. Did you get your ECU and TCU wet, by any chance?

    Check the ECU and TCU to see if they have little red LEDs on them. You may be able to get your codes there. 90s were weird... some had those lights, some did not.






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      #3
      I have not touch the computers, not sure if it's a wiring problem I am in the process of troubleshooting right so far no shorts and the car does run.

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        #4
        Look at the computers and see if the LEDs are there.






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          #5
          thanks but the TCU is shot harness smelled like insulation so I opened it up found a bad heat sink and the board around the heat sink was discolored.

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            #6
            sweet thread man. mine has been on for a long time . i have indeed got a ecu on stand by and another tcu on stand by as well. i will try these things and get back with you.thank you deevergote..

            A man that keeps looking back can't see whats in front of him.

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