Disco 4 will not start

This site contains affiliate links for which LandyZone may be compensated if you make a purchase.
T

tungi

New Member
Posts
5
Location
Lytham St Annes
Good morning guys, I have a question. Can anybody confirm, to get pressure at the fuel rail you need:
1. Low pressure feed to HPFP, circa 7 psi
2. The engine cranking
3. Pressure control valve closed
4. Volume control valve open
5. HPFP turning and in good order
If these conditions are met you should get at least 200 bar at the fuel rail.

I’m still not getting rail pressure. I’ve started with the easy stuff:
1,2 and 3 checked and satisfied
Item 4 is my next check. I am going to check the voltage going to the valve. If this is correct I’m going to remove the Volume Control Valve and check it’s working.
If that looks ok I will need to move onto the pump. I’ll check the belt is ok, if it is I will need to remove the pump. I’ll probably send it to Darwen Diesels to test and repair.

Does this sound right?
 
tungi said:
Good morning guys, I have a question. Can anybody confirm, to get pressure at the fuel rail you need:
1. Low pressure feed to HPFP, circa 7 psi
2. The engine cranking
3. Pressure control valve closed
4. Volume control valve open
5. HPFP turning and in good order
If these conditions are met you should get at least 200 bar at the fuel rail.

I’m still not getting rail pressure. I’ve started with the easy stuff:
1,2 and 3 checked and satisfied
Item 4 is my next check. I am going to check the voltage going to the valve. If this is correct I’m going to remove the Volume Control Valve and check it’s working.
If that looks ok I will need to move onto the pump. I’ll check the belt is ok, if it is I will need to remove the pump. I’ll probably send it to Darwen Diesels to test and repair.

Does this sound right?
Click to expand...

Hi

May i ask have u checked ur fuel filter first

What engine , year is ur D4 plse, Auto/ manual

Due to there complexity I would also get the codes read to see what fault codes come up
 
If you take a peak at the D3/4 forum and search for robbies guide to the low pressure fuel system theres some very good tests to carry out.
 
gstuart said:
Hi

May i ask have u checked ur fuel filter first

What engine , year is ur D4 plse, Auto/ manual

Due to there complexity I would also get the codes read to see what fault codes come up
Click to expand...
Hi yes I have checked the oil filter. The disco is 2009 and it’s an auto. The main fault code relates to the Switch Illumination shorted to ground.
 
lynall said:
If you take a peak at the D3/4 forum and search for robbies guide to the low pressure fuel system theres some very good tests to carry out.
Click to expand...
Hi lynall I have checked through Robbie’s guide and I get low pressure at 7 psi, which he says should be enough. I checked the connectors going to the hpfp metering valve and it shows 12.7 volts on one terminal and 3.5 volts on the other. With my message saying one of the circuits has shorted to ground, I wondered whether this was having an affect.
 
tungi said:
Hi yes I have checked the oil filter. The disco is 2009 and it’s an auto. The main fault code relates to the Switch Illumination shorted to ground.
Click to expand...

Hi

Many thks, What codes did u get please, might be able to do a search and find something that may help

Does sound like a cable has shorted itself out , maybe on the engine or bad pin connection

Know they can be challenging when trying to find a fault , lol
 
gstuart said:
Hi

Many thks, What codes did u get please, might be able to do a search and find something that may help

Does sound like a cable has shorted itself out , maybe on the engine or bad pin connection

Know they can be challenging when trying to find a fault , lol
Click to expand...
Hi gstuart,

The codes are:
BCM-Body Control
  • U2010-11 (2F) Switch illumination - General electrical failure - circuit short to ground
  • U1000-00 (2F) Solid state driver protection activated - Driver disabled
  • U3000-49 (2F) Control module - System internal failure - internal electronic failure
HVAC-Ventilation
  • B11FF-84 (2F) Air conditioning refrigerant pressure - Bus signal/message failure - signal is below allowable range
RLM-Suspension
  • C1A71-1C (AF) Rear right height sensor supply - General electrical failure - circuit voltage out of range
It’s the U2010-11 that I’m am really struggling with.
 
tungi said:
Hi gstuart,

The codes are:
BCM-Body Control
  • U2010-11 (2F) Switch illumination - General electrical failure - circuit short to ground
  • U1000-00 (2F) Solid state driver protection activated - Driver disabled
  • U3000-49 (2F) Control module - System internal failure - internal electronic failure
HVAC-Ventilation
  • B11FF-84 (2F) Air conditioning refrigerant pressure - Bus signal/message failure - signal is below allowable range
RLM-Suspension
  • C1A71-1C (AF) Rear right height sensor supply - General electrical failure - circuit voltage out of range
It’s the U2010-11 that I’m am really struggling with.
Click to expand...

Hi

U codes can normally be ignored , however it’s strange that it’s not starting , know the guys on the D3 forum are very experienced , have u tried asking there plse

Air con fault code reqs regassing and the height sensor there is a connector plug passenger side by the back wheel , can sometimes have a bad connection or wire has rubbed against the chassis , enclosed some pics

May i ask have u gone through all the fuses plse , imagine you’ve already done that

Know on the D4 the HPFP belt is timed , D3 isn’t

Also trying to think if there’s a cut out switch on these, alas mines a D3 so apologises don’t know how much they differ

Does the red alarm light stop when u open the vehicle

Know that’s not much help to u , will do a search to see if anything new comes to light for u

855BC6C1-2533-4E6D-9EC4-83B2F288906F.jpeg
6589B49D-A1B0-46FA-8639-6692D25C5116.jpeg
 
Last edited:
Just a thought

Have u tried clearing the codes , turning the engine over and seeing if any new codes come up plse

Also was ur fuel filter a genuine one , thks

Have u tried starting it with all ur keys , just pondering if possible a faulty transponder ????
 
You must log in or register to reply here.

Similar threads

W
Cranks but not starting 2012 4.4 tdv8
2
Replies
34
Views
664
welshd
W
cummins
ECU/Hi Press fuel Pump
Replies
0
Views
854
cummins
cummins
Sophia casper
Disco 2 Disco 2 td5 cranks but wont start.
Replies
3
Views
103
Stanleysteamer
Stanleysteamer
P
300 Tdi EGR Removal
Replies
3
Views
474
brianp38dse
brianp38dse
mad85
Disco 2 best place for fuel pressure sender on td5
Replies
10
Views
1K
MJI
MJI
Back
Top