17945 - Fuel Shutoff Solenoid (N109) P1537 - 35-00 - Malfunction

[Mark G]

I have been searching for an answer for my problem and hoped someone with the same problem has fixed it. I drove my 99 Beetle home from work and filled it up. When I restarted it it revved up popped and then idled normally. I drove home and had very low power. I re-started the car, same symptoms - revved and popping, then idled normally. I used my scan gauge to check for codes and there weren't any and there was no check engine light. I thought maybe I got a bad load of diesel, so I replaced my fuel filter. Still had problems and low power. I replaced my fuel sending unit. Still low power. I used vag-com and got 17945 - Fuel Shutoff Solenoid (N109) P1537 - 35-00 - Malfunction. I cleared it with Vag-com. Drove it and the power was back. After shutting off, I thought I had fixed the problem, but the next start it was back, and the code was back. Only resetting with vag-com would work, and only after it was cooled off would the code clear. I replaced the N109 solenoid with a new one. The problem came back after the next test drive and shut down. I cleaned the grounds under the battery and at the ecm. Still have the problem. I have changed the air filter, no blockages, and also changed the fuel filter again.

Thank you!

 

[wonneber]

Did you check the code at:

Ross-Tech: News

More info there.
Also check for frayed wires at the N109 and along the harness?

 

[BobnOH]

If this appeared after filling the tank, everything was good prior, could be bad fuel. Changing the filter won't fix that, you need to evacuate the tank and put in fresh fuel. A peak inside the fuel tank might reveal something as well.

 

[Mark G]

Did you check the code at:

Ross-Tech: News

More info there.
Also check for frayed wires at the N109 and along the harness?

Hi,

Yes I checked the wires and I checked voltage to the N109 which was 10. I know it's supposed to be 12. I have my old ecu so I tried that and it was 12 volts so I thought that was it. I drove the car and with it warmed up, I shut it off, then re-started it and it did it again. Revved up then normal idle and the N109 code came in also. When I was in bag com I noticed the egr staying at 19.9% and not moving. I decided to unhook the vacuum line from the egr and plug the end of the hose. Cleared the N109 code again, went for a test drive and warmed up the car. Shut it down again and re-started. Started like normal. No code. No more limp mode. All power restored. It is either the N18 or the wiring to it. I haven't had time to mess with it but I've been driving it to work and there aren't any problems other than the egr disconnected.

Thanks for the reply!

 

[Mark G]

If this appeared after filling the tank, everything was good prior, could be bad fuel. Changing the filter won't fix that, you need to evacuate the tank and put in fresh fuel. A peak inside the fuel tank might reveal something as well.

I thought the same thing! I did so many things related to the fuel system. I changed the filter twice, and put a new sending unit in. When I had that out the tank looked decent other than a couple pieces of plastic in the bottom. I sucked them out with the mityvac. So many different things could have similar symptoms I guess.

 

[BobnOH]

Definitely. If it is indeed a component failure, not bad fuel, start by checking the wires/connects to the fuel shutoff solenoid. Believe that's it the big wire connect to the IP.

 

[Mark G]

Definitely. If it is indeed a component failure, not bad fuel, start by checking the wires/connects to the fuel shutoff solenoid. Believe that's it the big wire connect to the IP.

It isn't the fuel shutoff solenoid, and it's not the computer, it is the egr N18 itself or the wiring to it. I don't know why the code was for the N109 solenoid. I have a collection of N109 solenoids now.

Thank you for your replies!

 

[BobnOH]

Yes, the ECU/MIL system is not infallible or comprehensive. From reading too many forums, it seems like half the issues we see on these older TDIs turn out to be wiring/connects/grounds.

 

[Randomhomelesstdibeetlegu]

EGR AND N109 are fed of a common current path that branches from relay 109. Fuse 32/34 and another I forget at the moment.

10 volts is far too low and shows an electrical issue. An ECU swap moving to 12 is the right direction.

After I redid my 109 relay wiring I had 14.1-2 at that solenoid when running and 14.4 everywhere else. The relay has a stupid resistor in it so any issues are magnified.

 

[Randomhomelesstdibeetlegu]

Check my post history to find pictures and a description of what I had to do. It also involves a swollen injector pump harness seal causing lack of full pin contact and same was up with the ECU seals. There were a lot of electrical issues with this stupid beetle. Beetles have the worst wiring thinner than other ALH cars.

 

[djd58]

I've got the same problem, changed the solenoid and the egr valve, my egr is deleted with a tune, I still can't get this issue resolved, wiring also seems to be good, 2001 golf tdi

 

[Mark G]

I used a bolt to plug the vacuum line going to the egr valve and cleared all the codes and it seemed to help. I ran it that way until I got a new malone tune (chip) since I used a PD150 intake system including the mass air meter. I ended up putting the vacuum line back onto the PD150 egr valve and haven't had any more issues with it as far as the N109 code. I did find the fuse box on top of the battery melted a few months later and when I had a stall and no re-start. The only way the car would start again was clearing the codes with vcds.

 

[djd58]

Mined already malone tuned and has been fine, the current tube has been in there for almost 2 years, im at a loss

 

[dpackard]

Mark G , I had the Exact problem as you! Blocked off egr line as you did. Power restored. Changed N18 and all is well wierd problem and code?

 

[dpackard]

Mined already malone tuned and has been fine, the current tube has been in there for almost 2 years, im at a loss

Mined already malone tuned and has been fine, the current tube has been in there for almost 2 years, im at a loss

Djd58. Try the N18 it fixed mine up