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Audi A6 C6 3.0 TDI BMK Not Starting: Fuel Pump Relay, Intake Manifold Flap, Turbocharger Control

ABRAM_TJE 19623 17
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How do I diagnose a no-start on an Audi A6 C6 3.0 TDI with a fuel pump relay break fault and additional intake flap and turbocharger control errors?

The no-start is most likely caused by the fuel pump relay/J17 not being driven, not by the intake manifold flap or turbocharger faults, because those two errors should not prevent the engine from starting [#16229300] If the pump runs and the engine starts when you manually ground the relay terminal, the pump and power side are OK, so the fault is in relay control, wiring, or the ECU output [#16243745][#16244983][#16245624] The suggested check is to reconnect the cut wire and use a 5 W bulb between the ECU/control wire and +12 V to see whether the controller actually switches the relay; if the bulb does not light, suspect a damaged controller or harness [#16243793][#16244913][#16244983] The relay marked 395 was identified as the fuel pump relay J17, while 614 is a different module related to energy management [#16239971][#16241071] One reply also notes that a faulty steering lock/free steering can be a common issue in these cars, but the thread evidence points first to the fuel pump relay control circuit [#16244988]
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  • #1 16229281
    ABRAM_TJE
    Level 10  
    Posts: 31
    Rate: 17
    Hello.

    Colleagues, I have a problem with this car. It wont start.
    The errors he has are:

    P1541 - Fuel pump relay - Break
    P1018 - intake manifold flap 2 - lower end position not reached
    P3348-005 control of turbocharger control unit - electrical fault

    Permission to start is.

    All joints under the left cover in the shaft were tarnished. badly fitted lid and gasket rolled up.

    Maybe someone can figure out the wiring diagram for this engine.
    Any hints.

    best regards
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  • #2 16229300
    szymitsu21
    VIP Meritorious for electroda.pl  
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    The fuel pump turns on?
    the other two errors will not affect the ignition of the car.
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  • #3 16229617
    ABRAM_TJE
    Level 10  
    Posts: 31
    Rate: 17
    Of course, the pump does not start.
    I tried vcds em through test el. exec but it doesn't work like that either.
  • #4 16229622
    szymitsu21
    VIP Meritorious for electroda.pl  
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    Relay and fuses checked?
  • #5 16229678
    ABRAM_TJE
    Level 10  
    Posts: 31
    Rate: 17
    Of course checked. Wszystkiue.

    On the shaft on the left is replaced because it is j17 from the fuel pump.

    Now there is an error P1633- accelerator position sensor 2 / signal too low

    I didn't touch the accelerator today.

    If someone could tell what the relay 395 is next to 614 on the shaft on the left.
    This 614 is like J17 from the fuel pump but if I give the weight to one of the 395 relay legs on which after turning the key is 12V, it turns on the pump.

    I have an overview diagram from the SSP and there is no relationship between the errors at the beginning and the accelerator pedal.
    Unless something is with the engine control unit.
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    • Audi A6 C6 3.0 TDI BMK Not Starting: Fuel Pump Relay, Intake Manifold Flap, Turbocharger Control 20170126_161132.jpg (2.65 MB) You must be logged in to download this attachment.
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  • #6 16239971
    buncza
    Level 16  
    Posts: 141
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    the 395 is just a pump. the latter is responsible for energy management - this is the scheme
  • #7 16241071
    ABRAM_TJE
    Level 10  
    Posts: 31
    Rate: 17
    My mistake, I spun myself.
    395 as a colleague wrote it is J17 from the pump.
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  • #8 16241166
    T5
    Admin of Cars group  
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    ABRAM_TJE wrote:
    if I give the weight to one of the 395 relay legs, which after turning the key is 12V, it switches on the pump.
    Then it fires up?
  • #9 16241193
    szymitsu21
    VIP Meritorious for electroda.pl  
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    T5 wrote:
    ABRAM_TJE wrote:
    if I give the weight to one of the 395 relay legs, which after turning the key is 12V, it switches on the pump.
    Then it fires up?


    I will only add that with such mass administration in different places from yes, sometimes it has negative effects.
  • #10 16243745
    ABRAM_TJE
    Level 10  
    Posts: 31
    Rate: 17
    szymitsu21 wrote:
    T5 wrote:
    ABRAM_TJE wrote:
    if I give the weight to one of the 395 relay legs, which after turning the key is 12V, it switches on the pump.
    Then it fires up?


    Yes it fires up

    I will only add that with such mass administration in different places from yes, sometimes it has negative effects.


    Dude, I know that.
    I cut the cable before proceeding to feeding the mass
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  • #11 16243793
    T5
    Admin of Cars group  
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    ABRAM_TJE wrote:
    I cut the cable before proceeding to feeding the mass

    Connect the bulb to the cut one and see if the controller controls the relay.
    Ideally, the driver will know if the driver is damaged or the harness.
  • #12 16244485
    ABRAM_TJE
    Level 10  
    Posts: 31
    Rate: 17
    At the helm, it comes out after turning the 2.57V key and after reversing it lasts about 30 seconds.

    There is no tension on this cut off.
  • #13 16244913
    T5
    Admin of Cars group  
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    There will be mass there. At the controller, connect a 5W light bulb. One cable for the controller, the other for the plus.
  • #14 16244983
    ABRAM_TJE
    Level 10  
    Posts: 31
    Rate: 17
    That's how I hooked up. It did not shine.
    Later I checked with a meter.
    Free rudder?
  • #15 16244988
    Anonymous
    Anonymous  
  • #16 16245041
    ABRAM_TJE
    Level 10  
    Posts: 31
    Rate: 17
    Connecting the cable back at the controller and at the relay as a factory punishment when turned to ignition is + 12V
  • #17 16245624
    T5
    Admin of Cars group  
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    ABRAM_TJE wrote:
    Connecting the cable back at the controller and at the relay as a factory punishment when turned to ignition is + 12V


    You have voltage from the relay coil, that's how it should be :)
  • #18 20009968
    Legion1988
    Level 7  
    Posts: 6
    Rate: 18
    ABRAM_TJE wrote:
    Of course checked. Everything.

    On the shaft on the left, it is changed because there is j17 from the fuel pump.

    Now there is an error P1633 - gas pedal position sensor 2 / signal too low

    I haven't touched the gas pedal at all today.

    If someone could tell you what the relay 395 is next to 614 on the shaft on the left side.
    This 614 is like a J17 from the fuel pump, but when I give the weight to one of the 395 relay's legs, which is 12V after turning the key, it turns on the pump.

    I have a schematic diagram with the SSP and there is no relationship between the errors at the beginning and the accelerator pedal.
    Unless there is something to the engine control unit.


    Hello.
    Sorry for reheating the old chop but I have a similar problem - see error on the acceleration potentiometer in similar natural circumstances.
    Has the problem been resolved ???
    PATIENT :
    Audi A6C6 4FH 2008 3.0TDI ASB
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Topic summary

✨ The discussion revolves around an Audi A6 C6 3.0 TDI that is not starting, with specific error codes indicating issues with the fuel pump relay (P1541), intake manifold flap (P1018), and turbocharger control unit (P3348-005). The user reports that the fuel pump does not activate, despite checking relays and fuses. Subsequent errors related to the accelerator position sensor (P1633) arise, leading to inquiries about the wiring diagram and relay functions. Participants suggest testing the relay and connections, indicating that a common fault in these vehicles is related to the wiring harness. The conversation highlights the importance of verifying electrical connections and relay functionality to diagnose the starting issue effectively.
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