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Ask Wolfgang Your Own Question
Wolfgang
Wolfgang, Audi master tech
Category: Audi
Satisfied Customers: 4384
Experience:  Senior Audi Master Tech 15 yrs
19871424
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I have a 2002 AUDI A6 i dont have any power at my fuel pump

Customer Question

Hi my name is ***** ***** have a 2002 AUDI A6 i dont have any power at my fuel pump fuse
Submitted: 1 year ago.
Category: Audi
Expert:  Wolfgang replied 1 year ago.

Hello there I'm Wolfgang.

I do need to know if you turn on the key does the check engine light come on in the instrument cluster?

Customer: replied 1 year ago.
sorry for the delay no check eng. light
Expert:  Wolfgang replied 1 year ago.

Ok the Ecu is not getting power or the ground is not there. I do need a vin # ***** get the wiring diagram to assist.

Customer: replied 1 year ago.
vin # *****
Expert:  Wolfgang replied 1 year ago.

WILLIE , was there any recent inspection of the fuses by you where you pulled them out and then reinstall them?

Customer: replied 1 year ago.
sorry for the delay, yes and the relay to
Customer: replied 1 year ago.
I will go ahead and rate you GOOD i will get back with you monday if GOD willing have a blessed weekend
Expert:  Wolfgang replied 1 year ago.

you do the sme and let me know if you need any more help !! have a safe one

Customer: replied 1 year ago.
Hi its willie last thing was did i inspect the fuse yes they all look ok and i change the relay and i check the big fues under the pcm
Expert:  Wolfgang replied 1 year ago.

Ok we need to check voltage and ground at the ecm

Let me get the pins to check that.

Customer: replied 1 year ago.
get back with you tomorrow
Expert:  Wolfgang replied 1 year ago.

Ok

Customer: replied 1 year ago.
Hi i was wondering if you were still going to get me the wiring dia. and the pins to check the voltage and ground i waiting allday yesterday
Expert:  Wolfgang replied 1 year ago.

sorry pin #21, 55,56,62 should be 12 volts

pin 1 and 2 brown wires should be ground

let me know what you have at the ecm

Customer: replied 1 year ago.
56 no power
Expert:  Wolfgang replied 1 year ago.

56 is for the brake light signal so that does not matter. is your ground good? pin 1 and 2?

Customer: replied 1 year ago.
both grounds check good
Expert:  Wolfgang replied 1 year ago.

did you check the ecu power supply relay?

Customer: replied 1 year ago.
no i did not which one would that be
Expert:  Wolfgang replied 1 year ago.

in the pic i have sent #3 in the plenum box..

Customer: replied 1 year ago.
is this the one in with the pcm
Customer: replied 1 year ago.
hey i was just thinking of some things to check its not getting any fire i dont know if that means anything
Expert:  Wolfgang replied 1 year ago.

Yes. The Ecu controls the coils so with the check engine light not coming on like you have stated it will not fire

Customer: replied 1 year ago.
OK so is this the relay next to the ECU or under the dash
Expert:  Wolfgang replied 1 year ago.

nex to the ecu

Customer: replied 1 year ago.
Expert:  Wolfgang replied 1 year ago.

373

Customer: replied 1 year ago.
that relay is not clicking when you turn the switch on is there another relay i can use to check it
Customer: replied 1 year ago.
if that relay does suppose to click when you turn on the switch and or crank it over what stops it from doing so, sorry for the headache but i really need to fix this car. THANKS
Expert:  Wolfgang replied 1 year ago.

should click and then stay energized when the key is on!!

Customer: replied 1 year ago.
OK what will cause it not to stay energize