Crank No Start - Fuel Pump Not Priming?

[a.four]

Went to start my car two days ago and it only cranks. When I open the door the fuel pump primes maybe a second but not longer like I remember it being. I checked Fuse 28 for the pump and it is all fine, I’ve swapped with a few others I know work. What else could it be?




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[Jayz691]

Have you checked your actual fuel pressure?
Check groups 230/231 with VCDS to check if it's building pressure.

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[a.four]

Have you checked your actual fuel pressure?
Check groups 230/231 with VCDS to check if it's building pressure.

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Haven’t gotten around to getting VCDS and the tools necessary for it - however pump assembly is all completely new and worked just fine last week.


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[Jayz691]

I'd get yourself a vcds cable. Without being able to read live data and data log, you're just guessing.

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[a.four]

Scan results below from VCDS.

-------------------------------------------------------------------------------
Address 17: Instruments Labels: 8E0-920-9xx-8EC.clb
Part No SW: 8E0 920 951 N HW: 8E0 920 951 N
Component: KOMBI+WFS 4 H14 0200
Revision: 0200 Serial number: 00000000000000
Coding: 0023008
Shop #: WSC 40832 512 00000
VCID: 3530FFC3E958EA02BCD-5160

3 Faults Found:
01314 - Engine Control Module
004 - No Signal/Communication
01330 - Central Control Module for Central Convenience (J393)
004 - No Signal/Communication - Intermittent
01304 - Radio
004 - No Signal/Communication

-------------------------------------------------------------------------------
Address 25: Immobilizer Labels: 8E0-920-9xx-8EC.clb
Part No SW: 8E0 920 951 N HW: 8E0 920 951 N
Component: KOMBI+WFS 4 H14 0200
Revision: 0200 Serial number: 00000000000000
Coding: 0023008
Shop #: WSC 40832 512 00000
VCID: 3530FFC3E958EA02BCD-5160

3 Faults Found:
01314 - Engine Control Module
004 - No Signal/Communication
01330 - Central Control Module for Central Convenience (J393)
004 - No Signal/Communication - Intermittent
01304 - Radio
004 - No Signal/Communication

-------------------------------------------------------------------------------
Address 46: Central Conv. Labels:. 8E0-959-433-MAX.clb
Part No: 8E0 959 433 CP
Component: Komfortgerát T7B 4336
Coding: 11880
Shop #: WSC 06335
VCID: 01585B13E81096A2505-4B28

Subsystem 1 - Part No: 8E1959801G
Component: Tõrsteuer.FS BRM 0706

Subsystem 2 - Part No: 8E1959802G
Component: Tõrsteuer.BF BRM 0706

Subsystem 3 - Part No: 8E0959801E
Component: Tõrsteuer.HL BRM 0606

Subsystem 4 - Part No: 8E0959802E
Component: Tõrsteuer.HR BRM 0606

1 Fault Found:
00955 - Key 1
35-00 - -

-------------------------------------------------------------------------------

[Jayz691]

Holy sh*t that's a LOT of codes, lol. I don't see anything for engine control module.? Clear codes and see what comes back.

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[a.four]

Holy sh*t that's a LOT of codes, lol. I don't see anything for engine control module.? Clear codes and see what comes back.

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Code 01314 shows, it has no signal.


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[feeltherain]

If you turn your key to accessory mode, is the mil/cel illuminated? If the cel/mil is not on with the key in accessory position, than there is in fact no communication with the ECM.

I had a similar issue with one of my previous B7s. I ended up having an issue in the module under the driver seat (can't remember if central electrics or not)that stopped my ECM from getting power to wake up intermittently. In my case I couldn't even scan into the ECM with VCDS.

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[a.four]

If you turn your key to accessory mode, is the mil/cel illuminated? If the cel/mil is not on with the key in accessory position, than there is in fact no communication with the ECM.

I had a similar issue with one of my previous B7s. I ended up having an issue in the module under the driver seat (can't remember if central electrics or not)that stopped my ECM from getting power to wake up intermittently. In my case I couldn't even scan into the ECM with VCDS.

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Here’s a picture of the cluster in accessory position, it’s definitely missing the CEL.




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[feeltherain]

So no communication at all then. Is your car parked inside or outside more often before this happened? It could simply be the relays under ECM behind the false firewall. If the drains under the cowl back up, water can rise and work its way into the ECM box. The seal on those boxes aren't the greatest when it comes to standing water and being a number of years old. Unfortunately to get into it to check you have to pull the wiper arms, then separate the cowl from the bottom of the windshield and then you can use a Torx-30 to remove the screws holding the ECM box closed.

Pulling the wiper arms can be a bitch if they've never been off though; I would recommend a puller. If it's not that case, send me you vin and if I have some free time I can try to pull up the wiring diagrams and find which wires through supply power and the wake up signal for ecm

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[a.four]

So no communication at all then. Is your car parked inside or outside more often before this happened? It could simply be the relays under ECM behind the false firewall. If the drains under the cowl back up, water can rise and work its way into the ECM box. The seal on those boxes aren't the greatest when it comes to standing water and being a number of years old. Unfortunately to get into it to check you have to pull the wiper arms, then separate the cowl from the bottom of the windshield and then you can use a Torx-30 to remove the screws holding the ECM box closed.

Pulling the wiper arms can be a bitch if they've never been off though; I would recommend a puller. If it's not that case, send me you vin and if I have some free time I can try to pull up the wiring diagrams and find which wires through supply power and the wake up signal for ecm

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Car is always parked inside, no water could’ve gotten under the ECM cover. I’m leaning towards a fuse.

Planned to have the car trailered up to the shop Monday anyway to have the ABS light coded in, will have everything checked at the same time now.


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[josegonzalez24]

Any luck ? Mine just started 2 days ago 2 times I turned it on and then died on me swapped the relays and checked fuse , used junk yard fuel pump and still just cranks but no start


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[a.four]

Any luck ? Mine just started 2 days ago 2 times I turned it on and then died on me swapped the relays and checked fuse , used junk yard fuel pump and still just cranks but no start


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Ended up being a fuse in the ECM box that blew. Replaced it and car started right up.


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[josegonzalez24]

Ended up being a fuse in the ECM box that blew. Replaced it and car started right up.


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Which one ? Middle or the one to the right of it ? I tried swapping out both and still nothing


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[josegonzalez24]

Which one ? Do you know which color connector


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[a.four]

Which one ? Middle or the one to the right of it ? I tried swapping out both and still nothing


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In my case it was both.


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[josegonzalez24]

In my case it was both.


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What color connector was it a fuse or relay ?


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