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AKE 2.5 tdi fault code 550

samiam Oct 25, 2011

  1. samiam

    samiam New Member

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    My allroad has a nasty hesitation. 2.5tdi ake engine. 200k. The fault code that keeps coming back is 550 'start of injection regulation, value above upper control limit'
    This points to a fault in the injection pump, but I replaced that new about 20k ago, a suggestion is the needle lift sensor (part of injector #3)
    Has anyone played this game before?
     
  2. adamss24

    adamss24 Well-Known Member

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    Who adjusted the timing ? Usually the pump timing slips a little or the belt stretches so it goes out of the optimal timing window... Where abouts are you based ?
     
  3. skyegtb

    skyegtb New Member

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    Hi adamss24, can I ask you a question about injection timing? I have VAGCOM and can check my timing on my AKE engine no problem, but if I want to adjust it can this be done without putting the front of the car in the service position? Thanks in advance,
    Angus
     
  4. adamss24

    adamss24 Well-Known Member

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    Hi mate, if you have vag com, select engine -> measuring blocks 04 -> switch to Basic Settings -> TDI Timing, then select the last engine from the drop down box (AFB/AKN/AKE/BAU/BDG/AYM,etc.) and see where the plotted line is. The coolant needs to be at 80 Celsius with the engine at iddle. If it's too retarded then slacken the 3 bolts from the right hand side sprocket and carefully turn the pump clockwise a few mm ! Then start the engine again and repeat the steps above to get the plotted line just above the middle line, close to the top line. Small adjustments make big difference !
     

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