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1.6 tdci engine cranking no start

gaborpinter
gaborpinter
in Ford Focus Club

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Hi guys, looking for some advice regarding my 2008 Focus (1.6 TDCI, G8DB)

So it happened that it was not used for rougly half a year and now it fails to start. It cranks, but the fuel rail pressure is way too low as per Forscan.

I have only one DTC P2459, but that's in relation with DPF (Diesel Particulate Filter Regeneration Frequency - Signal is above max treshold), which I'm aware of, but it should not prevent the car from starting.

What I have done so far:

  • refilled the tank 🙂
  • replaced battery
  • replaced fuel filter and primed a LOT: there is no air neither after the filter nor in the tank return tube
  • checked the wiring of the low pressure side solenoid of HPFP
  • removed the solenoid - with ignition on it definitely opearates, however I did not examine it with oscilloscope
  • check for leaks

The low volume - high pitch sound of HPFP is present, however it never stops if I leave the car with ignition on. If I remeber well, this sound was present only for 10-15 seconds - I guess until the required pressure is reached - and after it stopped earlier when the car started normally. Is that the case or I'm wrong?

The next suspect is the fuel rail pressure sensor, but I don't know how I could test it and there is no related DTC.

I attach the Forscan oscilloscope log of two failed starts. RPM is fine, but FRP does not builds up. On the second image, there are 3 starts. 2nd, 3rd start shows an even lower FRP (before 1st starts I primed by hand).

So what do you guys think? All advice is appreciated, please save her 🙂

failed_start_1.png

failed_start_2.png

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