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.