The car is a running car and has been in occasional use. I can not explain it any more than what I described.
One thing I think I noticed (but would have check to be100 % sure) was before the fuse was replaced, the flashing led on the pscan box only came on with the ignition on, I am pretty sure after the fuse replacement it came on when it was plugged in without the ignition on. Although I am not 100% sure as I said.
I am away a couple of weeks now, so could check that when I get back to confirm if it helps anybody
So after working through a few bits and pieces on the wiring, the final answer was much easier than anticipated. It was quite simply a fuse !
It would appear, for reasons not 100% clear to me just yet (and actually not sure I can be bothered to work it all through) that the same fuse supplying the interior light and radio (I don’t have one fitted) also powers in some way the diagnostic port/circuits for the engine, abs and airbag ECU, but not the Pektron SCU.
The fuse was blown (probably because of the radio wires left dangling). So one new fuse and a tidy up of the radio wiring and it all worked.
Thanks. Yes I did see that. I no longer have any pc’s with a disc drive. Of course I could get an external drive etc etc. but was hoping to find something online. I didn’t want to keep spending money after money for something that maybe available by others. (I’ll keep it in mind if. Don’t locate anything else)
My main point is I can not connect to the Engine or the ABS or the Airbag. So it seemed unlikely they all had broken wires as i guess they come from different parts of the loom. The common point for those 3 systems is the connector C0286 on the K109 Header (and maybe the earth on the K109).
The Pektron SCU I can connect to, comes direct into the port.
It’s a few days before I get the car back, so I need to find some wiring diagrams which are not obvious to find anywhere so far.
Thanks for the info. I will take a good look at the car when I get it back (its in the garage at the moment having some bits sorted). Can not find any specific wiring diagrams on line for the MG ZR, but like you say unlikely to be fundamentally different than the 25.
The C0286 connector on the K109 header looks a likely place to look as its common to the engine, abs and airbag. I will do the continuity check from the C0913 pin 58 through to C0040 pin 7 as well.
Locating the connector is probably going to be quite a challenge, I am not familiar at all with ZR’s (or car electrics in general to be honest!), but will take on the challenge !!