turbo water pump fuse & relay

Manute · 08-31-2003, 07:50 AM

hi!

I´m checking my faulty turbo water pump...I have the manuals and electrycal diagrams,but i´m not electrycian and its a bit complicated to me...I´ve located the 7.5 Amperes turbo water pump fuse on the wiring diagram,but where it is physically? In the main fuses box in the opposite side of the battery? And where is the relay?also there?

I have rad an answer for a tiopic I posted about grounding the pump to test it...I´m spanish and dont understand all...when you say i´ve to ground a contact....you mean to plug a cable to the contact and touch car´s body? I´m sorry,electricity is not my thing....

Also,if the result is the worse and I have to chang e the entire pump,how much it costs more or less,and where is the better place to buy it?Even from Spain it will be cheaper to buy it from US or other NA country than porsche factory here, i think.

Thanks for all!

Scott R · Scott R's Garage

Take the black wire that goes to the gold colored temp sender, that sits just below the throttle plate and ground that to the intake manifold, or somewhere on the body. That will start the pump.

Manute · 08-31-2003, 09:17 AM

Ok,now I understand!!

But you forgot something:"...That will start the pump.....if the pump works!"

Scott R · Scott R's Garage

Thats correct, also you only need to ground the connection for a second and the pump should stay running for a few moments after that.

Manute · 08-31-2003, 10:44 AM

HI! it seems it does´nt work. I have grounded it and nothing happens.I´ve tried with ignition off,ignition on,and even with the engine running.I´ve checked the fuse and its ok.

Here is a pic of the thermostat that I tried,i think that was what you are saying,isn´t it? may be i´m grounding another thing...
Oh! and for little i did´nt broke the wire,i think it was screwed,but i have to simply pull off....

1.2gees · 1.2gees's Garage

Just to check, you're just touching the wire that comes off the sensor right? Cause grounding the sensor wouldn't do anything...

Next, relay would be suspect, and yes that's located in the fuse box w/the other stuff. I would try giving the pump power directly before checking the relay though, it's plug is right next to it's mount (bracket mounts to driver's side strut tower).
Ahmet

Scott R · Scott R's Garage

Agreed, relay is suspect. The pump is the last to go unless it's been making a TON of noise.

BTW, thats a very clean engine!

Manute · 08-31-2003, 11:24 PM

Hi!
Yes,i´m touching the wire,not the sensor.I´ve unplugged it and touch with a wire,grounding with manifold,and nothing happens.There is no noise,simply nothing happens.Also i tried a device that lights when there is current (dont know english name),and does´nt light....don´t know if it because not current present or what.

I´ll try to power directly the pump,if i find the plug...it´s all veru compressed and unaccesible.But i´m not very lucky,if pump is the worse,sure it is the thing that fails...

You think is clean Scott?thanks! It had been hard to clean!

1.2gees · 1.2gees's Garage

Well if there's no current at the plug, that really indicates the relay. You could ofcourse make sure the pump works, but they seem to be pretty robust. When they fail they usually leak, or slow down big time and make lots of noise, rather than just stop working. Ofcourse it's easy enough to check the pump and eliminate it too, so you may try that, or just pop in another relay and eliminate the relay too, whatever you may choose.
Ahmet

Scott R · Scott R's Garage

Sounds like a relay, I am looking for the electrical diagram for that relay, but you should be able to pull the relay, and jump the connections to get current to the pump.

Manute · 09-01-2003, 09:36 AM

thank you very much you all,i believe i´m getting closest!

I have the wiring diagrams,but my knowledge is limited to lacte the fuse,not the realy,so if you can tell me where it is...it would be very helpfull.I´d take a pic when I can,to be sure.

If i pull it out and make a direct connection....i have no risk of frying something??I am usually cautious with electric and electonic things...

One thing more,today I make a date with porsche service to measure compression...i have to go the 30th....so I have 30 days to locate pump´s failure....or i´ll surrender and they will try it (at 55$/hour...)

Manute · 09-08-2003, 02:59 PM

i have taked a pic from my fuses and relays,i expect you can help me to locate the turbo water pump relay.I´ve checked the fuse,if i´m not mistaken is number 7,with 7.5 ampere.

Thank for your help!

Lawrence Coppari · 09-09-2003, 03:02 AM

Isn't there a sticker on the underside of the box cover that says what each relay and fuse controls?

Manute · 09-09-2003, 01:31 PM

it is?? I have not looked...tomorrow i´ll take a look,thanks!

Manute · 09-11-2003, 02:40 PM

Yeah! you are right! There is a big stick with all fuses and relays...and i spent an hour looking at the wiring diagram!Me fool!
And there is also a little tool to remove fuses...very very usefull,i would had discovered it before!

Well,the relay is the one named "ATL kühlung",or something like that....because it´s german,kuhlung may be cooling....well,it´s not important.

Next step,if you are so kind to help me,is...How can i test the relay?
Do i have to remove it?How a relay is removed,only pulling it?
And how can i plug a wire to know if pump works without the relay pluged?You see i´m total newbie with that....

Thank you for your help!!

Lawrence Coppari · 09-11-2003, 03:15 PM

Generally, there is a schematic on the relay so you can hot wire it. By using a wire or two with little spades on the ends, you can do what the relay does by plugging the spades into the prongs where the relay plugs in. Just make sure you read the diagram correctly before you do it.

You probably do not have a relay similar to this one in the box because this one has a timer built into it. Do you have a friend who has a turbo that has a pump that works properly so you can switch them and try it?

Manute · 09-11-2003, 10:48 PM

i´m not sure to know how to connect it without frying something there is ok...maybe i should wait till day 30th,when my compression is checked.

I dont know other 951...i have the exclusive here...i´m original,but i´m on my own.

Nothing to do with fuses Lawrence,but....in other post are frightening me because i need to change my turbo seals,they say i must change the turbo...do you think that?? That would be excessive money for me

Lawrence Coppari · 03:05 AM

Why do you think you need to change the seals? Does your intake have a lot of oil in it? Is water getting into the exhaust from the turbo? If the turbo water pump is not working, the life of the turbo bearings and seals is shortened. I have never changed seals so I don't know how to do it. I have changed turbos however.

These engines do burn oil. Mine uses about .75 quart a day when on the track (80 minutes track time). It has 142K on it. Even when I put a bigger (new) turbo on it, there was always a little oil in the intake parts. With normal driving, I get about 800 miles per quart of oil. Mine also leaks at the back of the pan.

Manute · 09-15-2003, 01:50 AM

I have a bit of oil in exhaust...but i´m worrying because oil consumption is alwasy high....yes,about .75 quarter per 80-90 minutes on track,but for me is impossible to make 800 miles per quart...i can do about 250-300 miles per quart,no matter how i drive.

Because i think seals have never been changed,and water pump dunno when has it failed,i expect the seals are not ok,here people sais that.
there is very possible...Even at factiry they said the same.

Where are the pan leaks?well....what is a pan? dont know the word...sorry(still learning)

And one thing i´ve just remember and really dont understand: Manual says that between the minimun and maximun mark on the oil dipstick it´s about 1.2 liter (little more than a quarter) capacity...i´ve observed that ,when i´m at the ver bottom,really at the minimun mark,with little more than half liter (about hal quarter) i reach the maximun mark.That´s why i´m refilling oil very often...i really dont understand this.