Help: 3x breakdowns due to fuel system. Jetta 2008 2.0L manual

[saabman]

I got a chance to have a closer look at the wiring diagram and that relay drives
Fuse 13 ---- ECU
Fuse 14 ---- Ignition Coils
Fuse 15 ---- Lambda Probes after the Cat
Fuse 21 ---- Lambda Probe
Fuse 23 ---- Fuel Pressure Regulator
Fuse 24 ---- MAP controled Thermostat

[Bmos87]

Hi all,

I have a 2008 VW Jetta (manual) with around 90,000 kms on it. I live on the north shore in sydney.

It has broken down 3 times over the last few months as follows:

- Around 5 weeks ago, it would not start in a car park. Cranks fine. Fuel pump did not turn on when car turned on (no sound). NRMA checked battery, tapped tank, gave it gas and cranked, nothing. Towed it to mechanic the next morning. Mechanic changed the fuel pump, ~$750.

- Drove fine for 2 weeks, drove up to Forster for the weekend (around 5h north of Sydney where I live). Parked the car for a few hours. Started it again fine, while going around the roundabout, I felt the power give out, felt a bit like a stall, so I cruised over to the side. Car didn't start after that, same symptoms. NRMA found no spark, no power to the fuel pump. Called mobile auto electrician, he found that there was no signal from the ECU to the fuel pump relay under the steering wheel. Got it towed to a mechanic on monday. They couldn't find any relevant codes, so I had to leave the car up there for 3 weeks while they got people in to diagnose the problem. They narrowed down the problem (by verifying the circuits according to the wiring diagrams) to the fuel pump control module. They replaced it, ~$850.

- I drove it back to sydney, and drove fine to work the next week. On Friday (22/3/19), the car wouldn't start in a shopping mall car park. Fuel pump didn't turn on (no sound). NRMA tried to start it, but it was all the same symptoms. Tried fiddling with the wiring on the fuel pump & module, no luck. Code reader showed P025C fuel pump control module low (can't remember exact code, I remembered description and googled for the code). Booked a tow the next morning.

- This morning, NRMA came by again to help me get the car out of the shopping mall so it could be towed. The NRMA mechanic tried to start it too, after explaining the situation to him, he tried applying power to the fuel pump manually using a battery then trying to start, but didnt work. He then tried removing and cooling down the R1 (big square box) relay at the front, and starting again. It started briefly! But died again, and we couldn't reproduce the situation. The relay felt really hot. We couldn't figure out what relay it was, not mentioned in the owner's manual.

By the way they checked connectivity on all the fuses on the right side of the steering wheel, and in the front. I've never had any problems with my key or central locking. The only other codes that keep showing up is related to the windscreen wiper (888 and driver side door window motor (932).

I will call the mechanics that last worked on my car on monday, and try to sort out a service under warranty.
Does anyone have a full diagram of what all the relays are and where they are in the car? Has anyone experienced this?

I'd really appreciate any advice. Please ask if you would like any more detail.

Thank you,
Pravin

Hi mate I had the exact same issue with my 08 147 Jetta, I'm not sure if you have fixed the issue yet, but for my car it was the earth block located at the base of the B pillar behind the drivers seat underneath the carpet and plastic panel. The earth was lose and the fuel pump control module is the top earth on the block. I tightened it and the car started first time and I haven't had the issue again. I did find after ages of searching that this model of Jetta is know for lose earth connections. Hopefully this helped.

Regards,
Brett