So my girlfriend's dad drives a Nissan Terrano II 2.7 Turbo Diesel and currently the turbo does not seem to be working. I've read that these engines rely mostly on the turbo, which seems to tie up with the current lack of any sensible power.
I've read up on how to bridge diagnostic port pins to flash the ECU light to display fault codes, but had no luck. What I've read suggests bridging pins 6 and 7, but pin 6 is empty on this vehicle. I have no idea why. I've had a quick look for the 'missing' wire but it's not anywhere obvious.
I've given up on the diagnostics idea for now and decided to have a stare around the engine bay for inspiration instead.
The vehicle is Portuguese registered and LEFT HAND DRIVE.
There is a sensor attached to the bulkhead on the driver's side (LHS of car; RHS as you look into the engine bay), below the brake fluid reservoir, which looks as though it should have a hose connected to it. There is also a loose hose with a split in the end, which will reach this sensor (but won't stay on because of the split). The hose comes from a little black thing with a few other hoses off it; I'm not sure what this is.
My questions:
What is this sensor?
Should the hose be connected to it?
Is this likely to be the source of the apparent turbo problem??
Pictures of said sensor to follow.