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Often times the speed is used for speed limiter/cut, launch control if you have a modified ECU, or when the ECU decides to go from closed loop to open loop (some ECUS like KA ).
Often times that would result in a CEL if your ECU supports that malfunction.
Also, the only way a CEL is lit up is Via output from the ECU. The ECU drives the light on when it detects an error
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