There are lots of posts/videos on social media about the Mazda water jet pump(s) failing.
However I decided to investigate the plumbing first. There is a check-valve in the plastic hoses between the pump and the first nozzle. Access is by removing the wipers and the drivers side (UK) bulkhead cover (just a few clips).
Apparently you cannot 'test' the valve by blowing through it, so I used a tyre foot-pump. This was inconclusive.
So I got a new valve at Halfords and that has fixed it!
Thought I would share as a lot easier than getting at the water bottle mounted pump.
Be careful not to touch/damage the exposed edge of the windscreen when the cover is removed, in case it triggers an existing screen weakness.
IK
