Doughboy
Member Since: 04 Aug 2020
Location: Tamworth
Posts: 92
  
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| Fbh not on diag all of a sudden |
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Hi all,
As in title, I have got an autel and occasionaly scan to see if any faults pop up. Very recently my fbh won't come on. I have been activating it using the remote fitted and my 3rd button on cold mornings.
When went to check if there were any faults showing why it isnt working, its not showing auxiliary heater in the list anymore.
I have seen it previously and cleared faults or run a priming routine.
Any ideas why I can't see it now on my diag.
The fuse looks OK.
Cheers
Rich
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 17th Jan 2023 6:08 pm |
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Flatlander
Member Since: 20 Jul 2015
Location: Here
Posts: 575
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It might have just been 'spiked' due to low voltage during cranking, either pull the fuse or the power connector for a few seconds, whilst you're at it, check the voltage supply at the connector and the fuse is intact. I've seen a few refuse to start due to volt drop across the fuse or harness but they still communicated.
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| 17th Jan 2023 6:22 pm |
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Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10663
 
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I guess make sure the climate control panel is ON when using the Diag tool
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| 17th Jan 2023 6:26 pm |
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Motolab
Member Since: 18 Oct 2019
Location: Sleen
Posts: 1820
 
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| Re: Fbh not on diag all of a sudden |
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Sorry i can not resist it if i read this
Doughboy wrote:or run a priming routine.
NEVER “run” a priming routine!
It is a diesel! Not gasoline..
Priming is ONLY to use IF you fit a new dosingpump or a new fuel line, otherwise never, even not when only the heater unit is exchanged …
As a matter of fact, a lot of FBH’s will stop working after such unnecessary fuel prime sessions, since the glowplug gets „glazed“ (is that correct english?) Or soothe up, when they do, the resistance changes permanently so the glowplug stops working correctly….
Regarding your question, i only see 3 options: fuse, wiring (12v, CAN) a ECU (webasto or LR) Best regards
Harold
Always looking for Pre '55's & Pre war British Motorcycles! knowing or having one for sale? PM please. I visit the UK 6 times a year
Ps. I edit my texts quite often, english is not my native language, so I will edit My “typo’s” etc. 
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| 17th Jan 2023 8:36 pm |
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Doughboy
Member Since: 04 Aug 2020
Location: Tamworth
Posts: 92
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Cheers guys, I will get out with the meter tomorrow when it's light.
Rich
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| 17th Jan 2023 10:50 pm |
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