Member Since: 03 May 2010
Location: Hants
Posts: 485
Help... Fuel sensor problem???
Just driving to a Resturant for birthday dinner when low fuel warning came on and fuel remaining showing totally blank (---). I had half a tank a little while back. No sign of leaking diesel underneath and no smells. I can only think this might be a prob with a fuel sensor.
Any thoughts much appreciated. While I sit in Resturant pondering if we will get home.
Thx.
Edit: Well, we put £30 of fuel in and level is still showing '---' with the same warning. No reduction in performance (it hasn't gone into limp mode). So I'm pretty sure it's a sensor - perhaps the fuel tank level jobbie???
5th Apr 2014 7:42 pm
Robbie
Member Since: 05 Feb 2006
Location: ¯\_(ツ)_/¯
Posts: 17932
I trust the meal was satisfactory.
Did you happen to be parked on a slope and does it happen with the EPB on and EPB off?
The sensors can be checked with a DMM but a backed-out connector terminal or an open circuit through damage is more common. A fault code reader would also help to decide if this was a sensor, wiring or a parking brake issue.
Are you happy to look for connectors and check for open circuits?Land Rover - Turning Drivers into Mechanics Since 1948
Member Since: 03 May 2010
Location: Hants
Posts: 485
Very good meal - good wine and company took the edge off worrying whether we would get home. (I was not driving!!!)
Warning/error first came on while we were driving and seems unconnected with EPB. I looked with a Fault Code Reader this afternoon but couldn't spot anything obvious. Is there a particular module / code that would be the likely culprit?
On connectors / open circuits - yes I can but depends how hard to get to etc. Any simple stuff to look for first?
Thanks
6th Apr 2014 3:09 pm
Robbie
Member Since: 05 Feb 2006
Location: ¯\_(ツ)_/¯
Posts: 17932
Ok, that takes the EPB out of consideration. Now if you have a code reader with live data and it can show 'active fuel level sensor(A)' and 'passive fuel level sensor(B)' from the body control module. Look for the following voltages and start tracing the wiring from the tank. If you have no live data and no obvious damage to wiring you will need to start back probing connectors to find the fault:
1. If:
A= >3.6v
B= >3.6v
Then:
Refer to the electrical circuit diagrams and check for backed out terminals and circuit faults between, C0390-18 and C0114-1
If no fault is evident then check C0376-18 to C0586R-8, If no fault is evident with the above, remove the fuel pump module and two fuel senders from the fuel tank and check for backed out terminals and circuit faults.
2. If:
A= less than 3.0
B= >3.6v
Then:
Refer to the electrical circuit diagrams check for backed out terminals and circuit faults between, C0390-2 and C0114-6, If no fault is evident then check C0376-2 to C0586R-20
If no fault is evident with the above, remove the fuel sender B (front) from the fuel tank and check for backed out terminals and circuit faults.
3. If:
A= >3.6v
B= <3.0v
Then:
Refer to the electrical circuit diagrams and check for backed out terminals and circuit faults between, C0390-3 and C0114-2
If no fault is evident then check C0376-3 to C0586R-21 If no fault can be found with the above check then the active fuel sender A (rear) will need to be removed and the wiring carefully inspected
Click image to enlarge
Land Rover - Turning Drivers into Mechanics Since 1948
Member Since: 14 Mar 2010
Location: Birmingham
Posts: 546
to fix fuel gauge problem:
firstly there is download to the IC
and this will not help the electrical connectors of the floaters (inside the tank)
need to be removed and wires spliced - very common issue
6th Apr 2014 8:25 pm
RichardB
Member Since: 03 May 2010
Location: Hants
Posts: 485
Robbie
Thanks for the detail there. Unfortunately I dont have live data disgnostics and it looks from your info that this diagnostic is going to hsve to be one for the dealer
Appreciate your input and will let you know the outcome.
6th Apr 2014 10:29 pm
Robbie
Member Since: 05 Feb 2006
Location: ¯\_(ツ)_/¯
Posts: 17932
You can achieve much with a DMM, a small torch and the enthusiasm to dig around the wires. Have a look at the wiring that is exposed as that is the most likely to be damaged. Dealers can get expensive when they are trying to find such faults.
Land Rover - Turning Drivers into Mechanics Since 1948
Member Since: 09 Sep 2017
Location: Glasgow
Posts: 1
Fuel level fault ! Fixed
I recently had fuel level fault come in interminat . One day it came on and stayed on for a week , until! Girlfriend phones say sing car doesn't feel right . She limped it home and.l checked fault codes . Engine control unit had fuel level low reduced performance . When a drive and it was Miss firing every 30 second and started cutting out when driving . Very danagerous !!!
Any way got it to garage pulled tank out tested level sensor and found open circuit level sensor 1 .pulled sensor off and tested sensor at multi plug in tank found ok . Pulled plug under sender off . The black pins off death!! Clean pins up until shinny inside and out , copper brush worked good . Closed pins over carefully and rebuilt . Fixed!!! 1 hour zero parts happ
Now if you have a code reader with live data and it can show 'active fuel level sensor(A)' and 'passive fuel level sensor(B)' from the body control module.
1. If:
A= >3.6v
B= >3.6v
2. If:
A= less than 3.0
B= >3.6v
3. If:
A= >3.6v
B= <3.0v
Hi all,
Just bringing a Robbie post up from a wee while ago...
Regarding Live Values for Fuel Senders.
I have one that doesn't fit the numbers above
A= >3.6V
B= =3.0V
Click image to enlarge
The vehicle has just been in to the dealer for its tank recall around 300 miles ago so guess something has been disturbed.
Going to drop the tank to check the wiring but wondered if anyone had some ideas on where to zoom into?
Closes Robbie answer is
Robbie wrote:
Refer to the electrical circuit diagrams and check for backed out terminals and circuit faults between, C0390-3 and C0114-2
If no fault is evident then check C0376-3 to C0586R-21 If no fault can be found with the above check then the active fuel sender A (rear) will need to be removed and the wiring carefully inspected
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