I've managed to get the MJLJ communicating with my laptop. I can read MAP and Auxiliary Inputs. However, I've had no success getting the software tacho to work, or the tacho in the dash.
I did my wiring over a period of time, so I've only just realized that I could have the PIP and SAW connections back to front (I soldered it up, put heat shrink over it, and am unable to test the wiring). So, I'm trying to determine whether or not I've got my connections the right way round. My wiring colours don't align with anything on here, so I'll label my wires 'red' and 'white'.
If I look at the Troubleshooting Guide, it states:
I've checked the other items, except for using an oscilloscope (I don't have one) and confirming the wiring (which is what I'm currently attempting to do).5.You can also check the PIP signal using the AC setting of a multimeter. with the engine running you should see an AC reading that goes away when the engine is not running.
I've also found plenty of sites online - including here and here - suggesting that the PIP line should give a +12V signal.
My first testing was using a LED. It worked when earthed from the Red wire, but not the White wire. The Red wire gives a +12V reading with my multimeter. But it doesn't give an A/C signal. In fact, the White wire gives the A/C signal. My original setup was to have White as PIP, but after many checks of connections, it didn't give me anything to indicate I had it correct.
So... I'm wondering if anyone can advise on the multimeter and LED tests, and which way they'd hook it up.
I'm also wondering, does the Tacho Out (from the MJLJ) require the Coilpack hooked up to function? Or should it work regardless of whether or not there's any signal going from the EDIS to a coilpack?
Mini A series rpm tacho software edis pip saw - search terms