"How can a speed reading totally change the engine running characteristics."
ESP systems are interlinked via CAN etc to the engine ECU to help control the vehicle is certain conditions.
(Simplest explanation),,,,,So you may have your foot to the floor on the accelerator, the car starts to skid and the ESP system will take over and cut the engine speed or feather the brakes and engine and transmission. You're not in charge the computers are .
This is why an ESP fault may not be an ESP fault but an engine fault. If the engine isn't working properly the ESP cannot carry out its function properly. So will stop working.
I hope I've not confused thing too much
Ian
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