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Hi Guys, need some advice please. I want to do a compression check on me L9. What do I need to disconnect to protect the ecu when I turn the engine over on the button.

Ps: I have done this in the past but can’t remember what I disconnected!!
Many thanks!!

Disconnect the 2 cables going into each coil, that's all you need to do

Thanks mate! I think that might be what I did last time but I read somewhere that you can damage the ECU because the current has no where to go. Also what about the fuel pump, do you just unplug the fuel relay?

You can do, though I've never bothered myself.

And as for the cdi, this creates a spark by acting as a grounding point for the signal coming back from the coils, so there is no electricity going to the cdi for it to dissapate as long as you have disconnected the coils already

Thanks mate, very helpful & informative!!

Much appreciated!!