Don't think I've ever heard of an electric rack failure on one...
Obviously doesn't mean it's impossible but rare certainly.
Think you're probably right - re fully electric power steering and reliability.
My youngest and his family are driving back from "sunny" Devon tomorrow so I'd thought I would take the Mazda back out to his house this afternoon. However Mrs J has decided to go shopping and I know I'll not see her 'till late afternoon which would mean a rush hour journey and I'm not doing that. She needs to drive one of the other cars out there to bring me back. I could take the bus back, but being out of the city their service isn't so frequent and I'd have to change somewhere on the way to get back across town to where we are. Almost certainly wouldn't make it without a pee stop and most of the public loos are either closed or cost a fortune now, so I'm not doing that either. We'll run it back out tomorrow morning.
Of course that leaves the car with me to fiddle with if I want. So decided to try out testing the voltage drop when the power steering is working - by the way, it's definitely fully electric Steven. I decided to test it against what voltages were showing on the Ibiza which is also fully electric - can't use the Panda because "the girls" have gone shopping together. So fished out my lightweight extension leads:
They can be connected together in various ways to give various options and because the connectors are just simple "ciggy lighter" sockets you can easily and cheaply make other adaptors.
Anyway, on this instance I simply connected then all together to give me the length to get from the battery through the N/S front window and allow me to connect my Multimeter to the croc clips on the piece of wood - piece of wood is there to stop the two croc clips catastrophically coming together when the other end is connected to the battery - also makes it easy to apply the multimeter probes. So, all connected up, engine running and head lights on (maybe I should have put the rear screen demist on too, but I forgot. Then wound the steering wheel steadily, so as to load the steering motor, from lock to lock a couple of times.
Results?
Both cars registered slightly over 14 volts with engine running and hands off the steering. I was totally amazed to find almost no detectable change in voltage when the steering motors in either car were working? I double checked my connections. I chose to go for the battery positive connection on both cars and a chassis earth for the negative because both cars have stop start battery condition monitors but it would make no difference going to the battery neg terminal in terms of voltage observed - just mentioning it for the record. and although I only tested the Ibiza once, lock to lock and back to the middle, I did it several times with the Mazda - steady at just over 14 volts all day long!
Only difference observed was that the Ibiza was at 12.7 volts resting open circuit before the engine was started - and it hasn't run since Tuesday when we went out to bring the Mazda back here. The Mazda was showing 12.1 volts again, as it did when I first checked it a couple of days ago. This despite it being charged for over half a day on my Ctek and showing fully charged on that machine. The car turns over quickly and starts easily, but the weather is nice and warm just now. I think we may be looking at a new battery for the winter on these findings. Note to self, do some more work on Mrs J regarding releasing funds to buy a TOPDON BT 200!
I found the info sticker on the battery by the way 53 AH with 470 cranking amps, I'll bet Halfords will do me a Yuasa for that at a good price.
And after all that steering wheel turning, the feeling is just the same. However, because I've been concentrating on it so much I've been thinking hard about what it might be. Yes, maybe something to do with intermittent power being applied. Maybe something like if a couple of segments on a commutator were damaged? Hmm? But then it hit me! Many columns have a universal joint where the column links to the rack don't they? If the U/J was worn the "tumbling" action of a worn one would feel very much like this wouldn't it? So I tried You Tubeing it and this came up:
Sounds like it's a known thing with them? Probably found the problem then? Don't fancy doing it and I think this old body probably isn't up to the physical contortions needed so I'll ask his local garage:
https://pride-motor-engineers.business.site/ another garage where I'm a "known face", to take a look and sort it out. If it is what I now think it is I don't want it being used for too long before it gets fixed.
Edit. Hope there's a generic OE quality part available. That Mazda genuine parts price makes me go weak at the knees!