Wiring up N75 - 2001 B5 A4 1.8T

[vtraudt]

Car arrived with no N75.
No connector found in the area. Some wires dangling around.
Don't have a 'spare' car to look at right now.

- were is the wire for the N75 coming from?
- what harness section
- what other connectors (for example MAF, etc) are coming off the same harness loom?
- what are the wire colors for the N75
- pin out for the N75 connector?

[onel0wcubn]

If I can find some time today I can get down to my garage and snap a few pics for you.

[vtraudt]

If I can find some time today I can get down to my garage and snap a few pics for you.

Thanks. Not sure where previous owner 'cut', but should be able to narrow down the search if I know what loom the N75 wires merges to.
In the meantime, will go and find a connector.

[B5carl]

Here's a diagram. I think this is for a AMB but the AWM should be the same for N75 hose routing.vacuum_diagram_amb_motor(2).jpg

Sent from my ASUS_I001DA using Audizine Forum mobile app

[vtraudt]

Here's a diagram.

Only need to know where wires are coming from and what colors/pin out of the connector.

I already 'plumbed' it up.

[B5carl]

Only need to know where wires are coming from and what colors/pin out of the connector.

I already 'plumbed' it up.

If you want a detailed diagram I ordered a bentley manual a couple of days ago. If there's a page with info on the N75 wiring then I'll leave a post. Other than that there should be info on google.

Sent from my ASUS_I001DA using Audizine Forum mobile app

[vtraudt]

Best would be a photo where the N75 wires come from; what leg of the harness loom they go into. I need to then get to that location and 'dig out' any remnants of the n75 hires and make a new wire with connector.

[AudiSon14]

It runs in the same loom as your sai, maf and purge just follow those back.

[vtraudt]

Found 2 wires coming out of the (maf, evap) loom. Now need to put connector on.
Also: IIRC, one of the wires carries +5V supply voltage to the solenoid (shared with other solenoids found under the intake manifold, I think N249 and ???, maybe evap N80?). Checking voltage on the wires I found, none has +5V against ground (the ones under the intake do). Broken wire?

I may need to rewire. Can I just tap into the "shared" (can someone post the wiring diagram) connectors for the +5V. For ECU signal, what pin number is the N75 signal (ditto wiring diagram)?

What voltage and resistance (against ground?) should I measure with ignition on and off, or car running. Or VAGcom output test for N75 (not much time to measure)?

Wire colors:
https://external.fdet1-1.fna.fbcdn.n...EjD307OOHj4EtW
Pin out (which pin gets 5V, which gets ECU signal)
https://scontent.fdet1-1.fna.fbcdn.n...54&oe=602EEE9A

[MerkurRS]

Found 2 wires coming out of the (maf, evap) loom. Now need to put connector on.
Also: IIRC, one of the wires carries +5V supply voltage to the solenoid (shared with other solenoids found under the intake manifold, I think N249 and ???, maybe evap N80?). Checking voltage on the wires I found, none has +5V against ground (the ones under the intake do). Broken wire?

I may need to rewire. Can I just tap into the "shared" (can someone post the wiring diagram) connectors for the +5V. For ECU signal, what pin number is the N75 signal (ditto wiring diagram)?

What voltage and resistance (against ground?) should I measure with ignition on and off, or car running. Or VAGcom output test for N75 (not much time to measure)?

Wire colors:
https://external.fdet1-1.fna.fbcdn.n...EjD307OOHj4EtW
Pin out (which pin gets 5V, which gets ECU signal)
https://scontent.fdet1-1.fna.fbcdn.n...54&oe=602EEE9A

These links WOULD be great and help others (including me right now), but the links you have are not working. This is always a problem among many forums I use; people post detailed answers with external links that drop off after a period of time. I would LOVE to see the answers for the OP's question.

[r77augh]

(2000 a4 1.8t ATW car) I am also dealing with wiring issues that someone else created, they cut the harness by the firewall before the airbox. I have 3 green/yellow stripe wires that i need to know where the pinouts are back at the ecm for these 3 sensors, N75, maf and evap?