1 Warm up the engine to normal running temperature & switch off all electrical loads.
2 Link contacts TEN (Test ENgine) and GND (GrouND) in diagnostic connector [use a paper clip].
A general view underbonnet 1.6 Roadster
3 Adjust idle to 850 rpm (exact position of idle air screw varies slightly depending on year/cc of engine).
4 Remove link.
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Disclaimer
Any work you do to your car is entirely your own responsibility. If in doubt, you should check technical advice with an independent , qualified person who has seen your car. The MX-5 Owners Club, its officers and forum contributors accept no reponsibility for any damage caused to your person or property as a result of you following or not following the advice offered on this forum.