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Another FBH question
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crwoody
 


Member Since: 09 Mar 2009
Location: Littleborough
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United Kingdom 2006 Discovery 3 TDV6 HSE Auto Zermatt SilverDiscovery 3
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

 
 
Post #84802116th Oct 2011 7:29 pm
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Robbie
 


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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.
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Post #84803316th Oct 2011 7:54 pm
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Robbie
 


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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.
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Post #84803616th Oct 2011 7:57 pm
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chocolademan
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Norway 2006 Discovery 3 TDV6 HSE Auto Java BlackDiscovery 3

Its located here.....

Click image to enlarge



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Post #84804016th Oct 2011 8:02 pm
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crwoody
 


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United Kingdom 2006 Discovery 3 TDV6 HSE Auto Zermatt SilverDiscovery 3

Thanks for that guys, much appreciated. Thumbs Up

That'll keep me busy tomorrow then, I really want to get it sorted before it starts getting properly cold.
 Clive

 
 
Post #84804316th Oct 2011 8:07 pm
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yogi972
 


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Not as convenient position as the Freelander dosing pump Rolling Eyes
  
Post #84804416th Oct 2011 8:09 pm
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crwoody
 


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United Kingdom 2006 Discovery 3 TDV6 HSE Auto Zermatt SilverDiscovery 3

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

 
 
Post #84836517th Oct 2011 5:10 pm
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CFB
 


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Nice one, very satisfying when you find the obvious source of a fault like this Thumbs Up
  
Post #84836617th Oct 2011 5:16 pm
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crwoody
 


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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

 
 
Post #84837317th Oct 2011 5:25 pm
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choppa60
 


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I thought it was 3 degrees , that fbh fires up , I stand to be corrected though . Thumbs Up
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Post #84837917th Oct 2011 5:34 pm
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chocolademan
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Glad to hear you sorted it Clive! Thumbs Up
Sorry to give you dud info about location of pump! Strange as it was from LR documents.... Embarassed


Choppa60, read here: http://www.disco3.co.uk/wiki/index.php/Fuel_Burning_Heater Thumbs Up
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Post #84841517th Oct 2011 7:18 pm
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cold_n_wet
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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.

Cheers

Glen
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Post #84842217th Oct 2011 7:47 pm
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Robbie
 


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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.

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Post #84842717th Oct 2011 7:58 pm
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crwoody
 


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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

 
 
Post #84843717th Oct 2011 8:21 pm
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woody32
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Location of FBH pump Thumbs Up


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Post #84849117th Oct 2011 9:27 pm
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