Member Since: 09 Mar 2009
Location: Littleborough
Posts: 2109
Another FBH question
It was showing 4° C on the dash this morning so I guess the FBH should have fired up, however it didn't, so I checked for fault codes and it came up with : -
B1D25 - "Dosing pump circuit - general electrical failure - circuit short to ground"
I've done a search and can't find any reference to this particular fault code or description, but from what I've read I assume the "dosing pump" is a separate fuel pump for the heater, presumably controlled directly by the FBH itself, so I need to find the pump and check it out.
So my question is - does anyone know where the pump is or have any experience of this fault?
Edit; I forgot to add that when I reset the fault code, it came straight back.Clive
16th Oct 2011 6:29 pm
Robbie
Member Since: 05 Feb 2006
Location: ¯\_(ツ)_/¯
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The fuel pump for the FBH is under the centre of the car towards the front bulkhead near the gearbox. It can be heard making a noise when the FBH starts although it only really stands out when the engine is not running (ie by using the FBH with an external trigger/timed start).
You are correct in that the auxiliary fuel pump is controlled by the FBH.Land Rover - Turning Drivers into Mechanics Since 1948
Member Since: 05 Feb 2006
Location: ¯\_(ツ)_/¯
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FBH Codes from manual:
Quote:
B1D2511 Heater Fuel Pump - Pump circuit short circuit to ground - Check the auxiliary heater fuel pump and circuits. Refer to the electrical guides.
Quote:
B1D2515 Heater Fuel Pump - Pump circuit short circuit to power / Pump circuit high resistance - Check the auxiliary heater fuel pump and circuits. Refer to the electrical guides.
Land Rover - Turning Drivers into Mechanics Since 1948
Member Since: 09 Mar 2009
Location: Littleborough
Posts: 2109
Thanks for that guys, much appreciated.
That'll keep me busy tomorrow then, I really want to get it sorted before it starts getting properly cold.Clive
16th Oct 2011 7:07 pm
yogi972
Member Since: 05 Jun 2011
Location: Kineton
Posts: 3372
Not as convenient position as the Freelander dosing pump
16th Oct 2011 7:09 pm
crwoody
Member Since: 09 Mar 2009
Location: Littleborough
Posts: 2109
Problem solved!
I found the pump (eventually,) contrary to the picture above, on mine it's mounted on top of the chassis cross-member that runs under the transfer box, so once the cover plate is out of the way, it's relatively easy to get to, I also found that pin 5 of the multi-plug on the FBH is the feed to it.
I found that with the pump connector unplugged, the resistance to ground was very low, more or less a dead short, but varying slightly.
I followed the loom back from the pump and found it goes to a connector inside the front right wheel arch liner, but just visible from underneath, at this point there were a number of wires with no outer wrapping up against a chassis outrigger, the white/blue pump feed wire had been rubbing against it and the insulation (and most of the inner strands) were worn through.
I joined a piece in, sleeved and taped it, then taped over the whole loom at this point to prevent it happening again.
Bit of a PITA job because I had to remove the wheel arch and liner to get access to it, still it's all back together now and just waiting for another cold morning to check it properly.Clive
17th Oct 2011 4:10 pm
CFB
Member Since: 02 Dec 2005
Location: Bradford, West Yorkshire
Posts: 6100
Nice one, very satisfying when you find the obvious source of a fault like this 2020 BMW X1 18d XDrive X-Line Auto
17th Oct 2011 4:16 pm
crwoody
Member Since: 09 Mar 2009
Location: Littleborough
Posts: 2109
Yes it is satisfying to find a definite cause for a fault, so much better than trying to track down an intermittent fault where the only definite thing is that you know you've NOT cured it when it happens again.
It leads me to wonder though, how many other obscure D3 faults could be due to similar causes, in my case it was that particular wire that was rubbing on the chassis but it could have been one of several others, I'm sure there must be other places where poorly protected wiring is badly routed resulting in other odd faults?Clive
Member Since: 05 May 2009
Location: Bergen
Posts: 1509
If you could take photos for the rest of use to use as reference ? I mean general locations, ie behind this panel etc would help alot.
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17th Oct 2011 6:47 pm
Robbie
Member Since: 05 Feb 2006
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Supplementary heating is requested by the ATCM while the engine is running if the ambient temperature is less than 5 °C (41 °F) and the engine coolant temperature is less than 75 °C (167 °F).
The ATCM cancels supplementary heating if the ambient temperature increases to 5 °C (41 °F), the engine coolant temperature increases to 75 °C (167 °F), or the engine stops.
Land Rover - Turning Drivers into Mechanics Since 1948
Member Since: 09 Mar 2009
Location: Littleborough
Posts: 2109
A few pictures then.
I didn't get one of the pump but as above it's just bolted to the top of the cross member that runs under the transfer box.
This one is looking up inside the front wing just behind the liner from beneath, you can just see where the wires are very close to the outer (rough) edge of the outrigger
Click image to enlarge
This is the repaired bit of loom.
Click image to enlarge
This is with the wiring back in place, notice the cable tie to hold the wires away from the rough metal bits.
Click image to enlarge
This was just to show all the stuff that had to be removed to get to the connector easily.
Click image to enlarge
As I said above, in my case it was the white/blue wire that had chaffed but it could have been any of them and then that would have resulted in a different fault.Clive
17th Oct 2011 7:21 pm
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Location of FBH pump
Click image to enlarge
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