VW Touran 1.9 TDI BKC 2006: Fuel Pump Power Discrepancy After Meter Disconnection

Hello, after disconnecting the meter for a while, he stopped feeding fuel.
I changed the fuel filter, flooded it with fresh fuel, twisted it a little and fell again.
There was no pump in the tank, so I checked the relay.
Ticking ticked, but I don't know if it touched, so I changed it with a horn, but nothing better.
So I got to the pump, unplugged the plug and on external cables pins 1 and 5 after turning the key I have about 0.02V sometimes to 0.06V
(when setting the multimeter to a range of up to 20V DC so that nobody has any doubts)
Disconnecting the pressure sensor immediately after the fuel filter does not cause any difference in the voltage readings.
To make sure that there are no more than one reasons, I pulled the pump out of the tank and after giving it 12V, the pump motor works.
Writing this I came up with the idea to check the voltage meter on the relay, I eliminate the problem with cables, what I'm going to do now.
It looks like this from my amateur point of view ...
Any other ideas?

Immo probably has done something. Someone can improve me?

sly_1978 wrote:

Immo probably has done something.

At immo it will start and go off.

A fuse under the hood, probably check 27 (terminal 30 of the fuel pump relay) but I'm not sure.

As if the immo would fire up for 5 seconds and go out, the problem may be completely different.
The basis for checking the fuses, relay and voltages on its contacts, then the continuity of the wires.

Voltage on the relay:
11.8V on the control side
0.02V on the supply side
Of course, we are talking about the momentary state after turning the key, or at start
11.8V battery (got a little wind up during rehearsals but keeps turning - I'm charging it tonight)

waves79 wrote:

11.8V on the control side
0.02V on the supply side

what does it mean because i don't understand
Describe what voltages do you have on which pins of the relay

I have already checked fuses, many times.
I'm going to watch the cables now ...
Added after 1 [minutes]:

spinacz wrote:

waves79 wrote:

11.8V on the control side
0.02V on the supply side

what does it mean because i don't understand
Describe what voltages do you have on which pins of the relay

11.8V on thin cables
0.02V on coarse that go to the pump
Regardless of whether the pump is connected or not, in both cases the relay has the same readings.

waves79 wrote:

0.02V on coarse that go to the pump

One wire marked on relay 87 goes to the pump !!!!!!!
Look for voltage at relay contact 30.

jacolino75 wrote:

waves79 wrote:

0.02V on coarse that go to the pump

One wire marked on relay 87 goes to the pump !!!!!!!
Look for voltage at relay contact 30.

There is no voltage at contact 30.
Only when closing the circuit does the previously mentioned 0.02V appear
(perhaps by the phenomenon of induction, but this is not related to the topic)

Do you want to check the fuse from the pump? How does it work if there is no voltage on the relay?

T5 wrote:

sly_1978 wrote:

Immo probably has done something.

At immo it will start and go off.

This counter made me think.

waves79 wrote:

There is no voltage at contact 30.

And here you have the cause of your fault. Maybe you have an alarm or a cut-off if you say that the fuses are definitely ok.

jacolino75 wrote:

waves79 wrote:

There is no voltage at contact 30.

And here you have the cause of your fault. Maybe you have an alarm or a cut-off if you say that the fuses are definitely ok.

Unfortunately, I don't know anything about any additional alarms or shut-offs ...
Fuses F10 from terminal 30 and F15 from the pump are good. Anything else, anyway
I even checked the voltage on the F10 fuse and it has those 12V what it has to have.
What should I do with this? Ride the harness and look for a damaged cable?
Maybe some connector somewhere along the way is what may not touch?

waves79 wrote:

Ride the harness and look for a damaged cable?

Well, rather, since there is voltage on one end of the cable and there is no on the other. Provided that you check the correct fuse.

Unfortunately, I haven't had time to get to this beam yet, but I stole the current from another terminal and the pump was running. If it's time I'll fix it right. Thank you for your help.