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james.works

Member Since: 19 Jun 2019
Location: dax
Posts: 17

Fuel gauge not moving

The fuel gauge in my Defender110 2.2tdci 2014 is not moving;

I have tried the instrument panel in another vehicle where teh gauge works fine so I took a close look at the wiring coming from the instrument panel and it's a mess. Perhaps the problem lies there somewhere, there are two cables not connected at all!

Click image to enlarge

I don't have much history on this car but from what I have learnt over the last few months it is made up of at least two, three if you include the new engine and gearbox we just put in.

The instrument panel is not likely to be the one that came with the vehicle from the factory in case that is relevant.

I'm not great with wiring so would appreciate some pointers on where to look, which of these cables are sending info to panel about the fuel sender? Perhaps I should start there!

Thanks for your help in advance!!

10th Apr 2021 4:53pm

Julie

Member Since: 07 Oct 2017
Location: Nantes
Posts: 421

2012 Defender 110 Puma 2.2 SW Keswick Green

You'll have to take out more than 1/4 before the gage in a 110 tdci moves

10th Apr 2021 8:55pm

james.works

Member Since: 19 Jun 2019
Location: dax
Posts: 17

The gauge reads zero with warning light and alarm on ignition no matter how much fuel is in it. There is no signal to the instrument I.assume.

10th Apr 2021 9:03pm

dorsetsmith

Member Since: 30 Oct 2011
Location: South West
Posts: 4554

check chasse loom gray plug in engine bay

10th Apr 2021 9:17pm

james.works

Member Since: 19 Jun 2019
Location: dax
Posts: 17

Connectors in the engine bay look ok, nothing untoward I can see anyway. There are two cables not connected to anything, just swinging in the wind! They are white/brown and black/grey, what are they supposed to be connected too, any idea?
Thanks

11th Apr 2021 8:44am

dorsetsmith

Member Since: 30 Oct 2011
Location: South West
Posts: 4554

Click image to enlarge

Click image to enlarge

wire colour

GO = Green -( orange tracer ) YP = Yellow - ( purple tracer )

C1040L-pin 31---------- GO------- C0376-pin 6 ---to-----C1759-pin 6-------to----- C0115-pin 1

C1040L-pin 8-------------YP--------C0376-pin7 ----to-----C1759-pin 7-------to------C0115-pin 2

C1040L = instument cluster plug

C0376 = engine bay plug--------------- C1759 = engine bay socket
C0115 = tank unit plug

Last edited by dorsetsmith on 11th Apr 2021 10:17am. Edited 3 times in total

11th Apr 2021 9:21am

james.works

Member Since: 19 Jun 2019
Location: dax
Posts: 17

Thanks! Do you have a link where I can download them, these are a bit hard to read, eyesight not so great these days!

Found it, unfortunately it doesn't help me as I have no idea what it all means or where to begin diagnosing the fault!

https://dokumen.tips/reader/f/defender-my1...g-diagrams

Last edited by james.works on 11th Apr 2021 10:23am. Edited 1 time in total

11th Apr 2021 9:48am

dorsetsmith

Member Since: 30 Oct 2011
Location: South West
Posts: 4554

https://1drv.ms/b/s!AtZSoWFHDgnGlHC3RsvoLFYkEEx-?e=vVBf1t

11th Apr 2021 10:13am

dorsetsmith

Member Since: 30 Oct 2011
Location: South West
Posts: 4554

You my have open circuit wiring between interment cluster and fuel tank unit or ( open circuit fuel sender

)

Multimeter is good friend for continuity circuit testing and also

Click image to enlarge

Last edited by dorsetsmith on 11th Apr 2021 10:50am. Edited 1 time in total

11th Apr 2021 10:24am

james.works

Member Since: 19 Jun 2019
Location: dax
Posts: 17

OK, I have a meter and I can handle some basic continuity testing, what do I test though?!

11th Apr 2021 10:42am

dorsetsmith

Member Since: 30 Oct 2011
Location: South West
Posts: 4554

work your way down from instrument cluster plug continuity testing two wires

chasse loom is harder as one end has plug in engine bay but other end for fuel sender is at top of the tank ( but in past I have removed loom conduit from chasse loom at rear end wheel arch and find the two wires and continuity testing between this point and the engine bay plug

if find that all is ok with wiring from instrument cluster plug to rear end wheel arch you all need drain fuel tank and lower tank down so you get to the plug at the top

11th Apr 2021 11:35am

james.works

Member Since: 19 Jun 2019
Location: dax
Posts: 17

Great thanks, which two wires am I testing?

11th Apr 2021 12:07pm

dorsetsmith

Member Since: 30 Oct 2011
Location: South West
Posts: 4554

green wire with orange tracer and yellow wire with purple tracer test individually with separate retune wire as find that one or both wires are open circuit. test each part of the circuit individually i.e. Instrument cluster plug to engine bay plug in order isolate faulty part of the wiring loom

11th Apr 2021 12:38pm

james.works

Member Since: 19 Jun 2019
Location: dax
Posts: 17

I have continuity on both of those cables from the instrument cluster all the way to the fuel sender unit, the instrument panel is not faulty as I have tested it in another puma. So it could be the sender unit itself or is it possible that it is software related as the panle is not the original one paired with the ECU?

11th Apr 2021 3:09pm

dorsetsmith

Member Since: 30 Oct 2011
Location: South West
Posts: 4554

its not software .

how much fuel in tank ? ruffle

resistance reading are you getting

11th Apr 2021 4:51pm

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