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PedalSpanner



Member Since: 01 Mar 2022
Location: Sheffield
Posts: 4
United Kingdom 2003 Defender 90 Td5 G4 LE Borrego Yellow
Intermittent Speedo? What to check?
Hi, I've got an issue with my Speedo and possibly my fuel and temp guage. When driving my Speedo will drop to 0 and then occasionally come back to life and work normally, then drop to 0 again. 90% of the time it sits at 0 or jumps to around 10mph then drops. I also think my fuel guage stops reading accurately, but doesn't drop to empty. My temp guage never gets to hot.

The speed sensor on the gearbox has been replaced. My next plan is to check the shared earth in the instrument wiring loom and maybe the red ECU plug?

Is there any other obvious bits that may be causing these issues? I'm thinking it's a dodgy earth but open to ideas?

Cheers in advance.
Post #986654 24th Mar 2023 12:33pm
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Penfold_6290



Member Since: 22 Sep 2021
Location: Dorset
Posts: 319
United Kingdom 2002 Defender 110 Td5 CSW Epsom Green
If your problem exists in the dash then I'd be checking the instrument plugs first. Whip the binnacle off and check for water ingress and/or corroded connections.
Post #986659 24th Mar 2023 1:39pm
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TexasRover



Member Since: 24 Nov 2022
Location: Paris
Posts: 1064
France 2002 Defender 110 Td5 DCPU Chawton White
Also suspect Earth Connections. When I got my Td5 the engine supposedly overheated instantly when I switched the AC on, or rather the gauge moved because of a feedback on the earth circuit.
Post #986663 24th Mar 2023 2:13pm
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scotsstag



Member Since: 17 Jun 2012
Location: D+G
Posts: 534
Scotland 2004 Defender 90 Td5 CSW Rutland Red
On mine it was the Transducer on the gearbox.
Cleaned and refitted it and it's lasted for years.
Best/easiest access is from above via removal of centre seat/cubby box. 04' 90 Td5 CSW..
Post #986665 24th Mar 2023 2:46pm
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NickMc



Member Since: 01 Oct 2014
Location: Norn Iron
Posts: 1627
Northern Ireland 2006 Defender 90 Td5 HT Bonatti Grey
The earth for all this is under the bonnet on the bulkhead - white header plug with all the black wires beside the steering column and expansion tank.also earth on side of transfer box in front of mount, common after transfer box or clutch change to be loose or forgotten
Post #992911 16th May 2023 10:01pm
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