The original power steering pump was broken.
it took down the 100A Fuse too.
I replaced the PS pump with ZF Brand. Then replaced the 100A Fuse too.
Before I plugged in the PS pump's main connector, I checked the voltage. It has 12 V (So the new 100A Fuse is fine).
After I put all together then run the engine. The PS still does not work..:(
I can't access the Mini Wiring diagram from BMW planet.
Please Help...

 

If you have power to the pump, but the pump is not working, i can only assume the pump you received is bad.

Is your car eligible for the power steering recall? Could save you some money. Recall PDF

 

Is the car running...
There is a "sense" wire...no alternator output...no PS pump.
Voltage with the car running should be more like 14.2 volts with a good alternator and battery...13.2 at the low end....
12 usually means no alternator...so no pump.
Intent is to let you drive without the pump a bit longer if the alternator dies...it is such a big electric motor, it would kill a battery very fast.

 

Hi Everyone...Thanks for the reply.
The car is 2005 and I checked to dealer, based on VIN it is not covered by the recall.
When I checked the voltage the engine was off.
I turned the engine on and turn the steering wheel way to the right and left.
Before I installed the new ZF pump I had install a Dorman pump and it did not work either.
So I doubt the pumps are bad.
The old pump that dead was producing smoke and took down the 100A.
Is it possible it damaging other electronic like any ECU relate to the power steering pump?
Are there any other Fuse that relate to this pump operational?
I checked the PS Fan fuse its good and the PS Fan is running (I turned on the AC and I saw the PS Fan was running)
The alternator is good.
Are member here had the same experience as mine that the PS took down the 100A Fuse?
Thanks.
PS: I am not an English native speaker, for give my grammar.

 

Did you check the wiring harness? They sometimes melted and caught fire when the power steering pump shorted and kept running. Maybe that's what was smoking, and the harness has a break somewhere.

 

I checked the big main cable (100A Wires) and connectors with Visual and Volt meter (Voltage Between the + and -).
I just had Visual check on the smaller connector, it looks ok. I don't know how to check the smaller wiring with Volt meter.
I can't access the Wiring Diagram from BMW Planet.
Does anyone have this wiring diagram?

 

it works now
Took a little drive..and washed it...poor mini..lol
Now I have extra PS pump...hahaha

 

ok, so was it a plug or just needed driven and prime the pump with fluid ?

 

Thinking the same thing. If you found a solutions maybe posted so someone else having this problem can find the answer.

 

Its a silly mistake. I was shamed to tell it here.
Anyway...after I found an allegedly Mini PS wiring diagram on internet, I traced back...Its the F39...LOL
So luckily I have a spare 5A. Its run yesterday. Filled up the gas tank, Took a nice countryside spin. back home..washed it..took another short drive on twisted roads.
It was fun..! Drive like a gokart..!
I was thinking to sell the mini..It wasn't driven for more than 6 months and rarely use it.
But now I am thinking to keep it...maybe forever! Because I have a spare PS pump now..LOL
I am wondering if the Mini S must be more fun because more power..but I expect the used ones will have more problems but bring it on..The fun paid the troubles..LOL

 

Its more fun because its a MINI, no shame in missing a fuse.

 

The F39 was not missing, It was blown up.
I think when the PS pump took down the FL4 (100A) it took down the F39 as well.
The PS pump will fail again in the future but I have learned the PS Failure syndrome now.
I could not wait to drive the mini at lunch break..!!

 

Hmm....I went 10 years, 96,000 miles, no failures . Had a 2005 r53 like you.

 

Ya..Mine failure at 126K Miles...
My Mini is not a well maintained one. ( It remind me to buy a coolant today LOL)
They said After Feb 2005 they improve the PS Pump.
The ones that I installed now is a ZF brand, expect can survive another 125K and 12 years...hahaha
I was thinking to give it to my son..but now I think I will keep it...he can get a used civic..

 

That FL4 is nicely located isn't it? I've messed with it when trying a power steering delete and I was slightly annoyed by MINI's choice of putting fuses underneath the fuse block, with barely enough wire loom length to flip it around.

 

I know this is a old post but this is my issue

I have a question, power steering pump changed, getting power to pump, changed 100 amp fuse changed cooling fan still not working. Before change pump just quit working no whining or anything. This is a friends car and I having ever had this issue. When mine went out it started to whine. I also hooked up my computer to scan for issues and failure to communicate with ps system keeps coming up. I checked all fuses and they are good. What would cause the pump not to come on, where does the signal come from and how can I test to see if it is getting signal to come on?

 

checked the small connector 3 wires green no volts, yellow 14.3 with car running, purple 12.2 with car running, green 0, with just ignition on, green 10.4, yellow 0. Battery is 12.4 not running, running it is 14.3

 

Please could you tell me how to check this small connector with a multimeter?

 

Just in the case if someone else is interested.

I did full rebuild of electrical motor of the pump
It is documented here: https://www.instagram.com/mini_bmw_mechanic/, more precisely these posts:
https://www.instagram.com/p/CYS81Wtr5Pw/




The last post has a video of benchtesting the pump and info on how to do it.

If the pump keeps working when engine is off, or it is not working at all, then one or both of the MOSFETs inside the pump stuck in the opened or closed position.
Here are the MOSFETs you might need to replace (2x 2N04H4; can replace by IRF3205 (TO220)):


If the capacitors are swollen - replace those two. Could replace the diode too, if it is dead (PBYR3045WT one).

 

Oh man looks like carbon deposits shorted out those mosfets.

How hard is it to remove the rotor from the main bearing housing?

I am planning to inspect mine too and do some cleanup.

I am wondering if I can put a some sort of varnish paint all over the board just like what they use in motor coils., this will prevent carbon deposits shorting out the electronic components., they are all covered\protected by the vanish no matter how much carbon accummulation gets there.