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Discussion Starter · #1 · (Edited)
Hi,

We have really rainy season lately and I waded some floods yesterday with ease. Some 30-40 cm deep at most, and I went properly, not like crazy.
Then haur later I attacker a hill and going back down steep slope I tested downhill assist feature, which did not seem to have an option to control acsending speed. Maybe I need to study it more.

And thet day I had near empty gas tank, but not so low to trigger gas low warning lamp.

Then it happened, just when I finished steep downhill with down assist in 4LO:
Engine shut off.

No chance to start it back, starter is working, but does not start, and dash is like christmass tree, all lights on.

Hmmm, let's scan with OBD for DTC... I know day before there were no DTC, but now I get all these below.

What do you think could be main cause?
  • Water in fuel, as fuel fill hose is damaged under rear wheel well and fuel leaks if I top it up to max. Maybe watter mixed with low fuel level when I was driving throigh floods?
  • Air in fuel, as I had near empty tank, but not down to warning level
  • Water messed up some sensor or connector when I was driving through the floods
  • Downhill assist system malfunctiom, as this happened right after I swithed it off
DTCs detected:
  1. P2293 Fuel pressure regulator 2
  2. P0089 Fuel Pressure Regulator 1
  3. P0089 Fuel Pressure Regulator 1
  4. P2293 Fuel pressure regulator 2
  5. P0571(62) Test failed, Cruise control/brake switch A - circuit malfunction
  6. P0089(F1) Test failed, Fuel pressure regulator 1 - performance problem
  7. P2293(7A) Test failed, Fuel pressure regulator 2
  8. P1585(00) Throttle Control Unit Malfunction
 

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I am not aware that the V6 was fitted with downhill assist, certainly mine isn't.

Water in the fuel would cause some of those codes. Drain off some fuel by disconnecting the filter near the tank and see if there is water in it. (The water and diesel will separate)

The other possiblity, there is a very large electrical connector block at chassis level about under the passengers right foot. (At the bottom of the A pillar) It isn't well sealed and certainly causes issues on this model.
 

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Discussion Starter · #3 ·
Water in the fuel would cause some of those codes. Drain off some fuel by disconnecting the filter near the tank and see if there is water in it. (The water and diesel will separate)

The other possiblity, there is a very large electrical connector block at chassis level about under the passengers right foot. (At the bottom of the A pillar) It isn't well sealed and certainly causes issues on this model.
Good idea, especially that electrical connector block. I found it, full of mud and wet, but I couldn't pulll it apart. Must lookup manual for how is that lever locked to pull it apart. Will do tomorrow...
...and I will also check for possible water or air in fuel lines. Finally it stopped pouring from above, so I can work on car without umbrella.
 

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Discussion Starter · #6 ·
Checked fuel filter, poured all out and no signs of water. Then I vacuumed all air out via air release valve on top of engine, hope this is OK after filter was emptied...
...but still no joy :(
I also cleaned electrical connector behind right wheel on passanger side, looked clean inside, but I cleaned it anyway and put contact grease to be sure.
Still at no avail.

I am targeting hill descent control now...
 

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Have you got the tool to bleed the fuel system? A bit difficult.

 

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Discussion Starter · #8 ·
Well, I don't have tools for air bleeding, so I did it my way, like Sinatra. Disconnected fuel filter incoming line and with 4m long hose and shop vac pulled fuel from tank. Connected input hose back to flter.
Then I repeated through fuel filter, sucked all air bubbles out of it and put lines back together.
Repeated procedure via air bleeding connector on top of engine.

But no, it does not start...

Interesting: cleared all DTC last night and now there are no trouble codes anymore. Except it does not start.

Maybe to figure out, whether it has electrical fuel pump in tank, or only the one on engine.
Because I left fuel filter OUTPUT hose opened, cranked the engine, but fuel does not come out.

I also checked all fuses.
Damn...no idea what next.
 

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Discussion Starter · #13 ·
Still nothing :(

Today I poured 4 litres through air bleeding valve (see pic), it went very slow. Added 15 litres into tank just to be sure, so I guess gas should be all over the system.
Tried twice for about 25 seconds, but nothing.

I also tried to read fuel rail pressure with 15 EUR ELM 1.37 OBDII adapter, but it showed 0 psi. But I am not sure if it can read this PID at all.

Good news:
I think I fixed broken overflow pipe on cooler :)

Here I put 4 litres in. I guess it went slowly back to gas tank via return line:
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Discussion Starter · #14 ·
Still trying to figure it out myself, as my mechanic will have time next week. I noticed 2 throttle related trouble codes in opening post, and I see this when stopping the engine (and when not starting). Is this normal or a malfunction?
 

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Discussion Starter · #15 ·
Hmmm, I am spamming my own thread and just found this guy, damaged from holding forks. Looks like it is pinched down to core, so it is not tight anymore.
What is this sensor?
Might be related to my problems?
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