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I've just fitted a Motronic ML4.1 setup to my Mi16 engine after it being a Jetronic setup, so I'm trying to get it all up and working. So far it doesn't want to fire up, so I decided to try using a diagnostic switch and light (using pins 4 & 17 on the ECU). According to Mr Haynes, there's two modes of diagnosis that can be done. One requires you to press your switch (i.e connect 4 & 17 to ground) after the ignition is on for 3 seconds to get a code (sequence of flashes) for sensors. The other mode is to press the switch while you turn you ignition to test the actuators. I decided the try and test the sensors by pressing the switch after turning the ignition on, but it behaves like the second mode which buzzes the fuel injectors and gives my a 81 code (fuel pump relay). Is there any way I get it to diagnose the sensors without it actually running the engine (which it is failing to do)? Also if the fuel pump relay is a problem (the relay is brand new), how do I know what sort of thing it is counting as faulty? How does it check it, the resistance of the relay coil?