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james.works

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

The sender unit is also new, just checked with the guy that fitted the new engine.

Tank was filled and has done around 150kms since.

How do I check for resitance?

Thanks

11th Apr 2021 4:22pm

dorsetsmith

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

How do I check for resitance?

at instrument cluster plug with meter set resistance and probes one pin 31 green - orange wire and other one pin 8 yellow -

purple wire

reading ?

11th Apr 2021 4:47pm

Davy

Member Since: 16 Feb 2017
Location: DERRY
Posts: 39

I’ve had a wire break off at the solder joint in the fuel pump. Giving me an empty all the time reading pump out and fault was clear to see

11th Apr 2021 5:46pm

james.works

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

I get 491 ohms

12th Apr 2021 6:05am

dorsetsmith

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

491 ohms = fuel tank empty

The fuel tank sender is saying that tank is empty

--------------------------------------------------------------------------------------------------------
had wrong sender spec

so 491 ohms = 1/2 tank of fuel prox

Last edited by dorsetsmith on 12th Apr 2021 8:06am. Edited 2 times in total

12th Apr 2021 7:03am

james.works

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

Interesting, definetely not an empty tank though, there's at least 40 litres in there.

So a lower resistance would indicate more fuel, is that correct?

I've just plugged the instrument panel back in and it's working! Although showing only a quarter tank full which I doubt, I'll fill it and see what happens.

So I'm guessing a corroded pin or something.

12th Apr 2021 7:19am

dorsetsmith

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

So a lower resistance would indicate more fuel, is that correct? yes

need to see if resistance changes with fuel level in the tank ?

Last edited by dorsetsmith on 12th Apr 2021 8:02am. Edited 3 times in total

12th Apr 2021 7:27am

Martin
Site Admin

Member Since: 02 Apr 2007
Location: Hook Norton
Posts: 6728

2015 Defender 90 Puma 2.2 XS CSW Montalcino Red

2.2 spec senders are 50 Ohms full 1000 Ohms empty.

1988 90 Td5 NAS soft top

2015 D90 XS SW

12th Apr 2021 7:39am

dorsetsmith

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

That`s interesting means my sender spec not from 2.2 110 hm

but sender arm from 110 2013 my problem not your

sender arm fitted to wrong tank unit now as per martin spec

Last edited by dorsetsmith on 13th Apr 2021 11:02am. Edited 2 times in total

12th Apr 2021 7:41am

dorsetsmith

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

So gauge is reading 1/4 tank but sender resistance reading indicates 1/2 tank proz

try this with instrument cluster plugged in and power up move the wiring attached plug around and see if the fuel reading changes ?

1. if so cracked solder joints between PCB and pins

2. DC voltage reading at instrument cluster plug pin 1 ( + )----and---- pin 17-( - ) battery in to instrument cluster and

DC voltage reading at instrument cluster plug pin 2 ( + )----and---- pin 17-( - ) ign input to instrument cluster readings with engine running

Last edited by dorsetsmith on 12th Apr 2021 6:08pm. Edited 2 times in total

12th Apr 2021 11:05am

dorsetsmith

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

https://www.defender2.net/forum/topic59938.html

12th Apr 2021 5:55pm

james.works

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

Thanks, I'll get to this asap. Update - Filled up yesterday, took 30 litres, gauge didn't move, still on 1/4 tank.

13th Apr 2021 6:40am

dorsetsmith

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

Has sender resistance value lowered

13th Apr 2021 10:56am

james.works

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

No, 488ohms at the instrument panel and 484 at the sender.

14th Apr 2021 3:03pm

james.works

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

Does this absolutley isolate the fault to the sender unit?

15th Apr 2021 6:42am

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