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Gnasher

Member Since: 22 Aug 2009
Location: Cornwall
Posts: 8

2009 Defender 110 Puma 2.4 USW Rimini Red

CAN-Bus fault - wierd speedo fault and power increase??

CAN-Bus fault? My 110 Puma XLS 09 plate has an anoying fault that does not show up on the fault code or even register with a diagnostic tool when running on the road. The fault shows itself as a sudden increase of power without pushing the axcelerator and at the same time the speedo 'flicks' upwards 10-30mph without the vehicle speeding up. This only appears to happen when at low(ish) revs when changing up through the gears.

I have been told that it could be damp in the circuitry of the speedo unit? Although how water can get inside a Defender is beyond me!!

Any ideas people? If you can't climb on it, don't drive it!

19th Oct 2013 11:59am

Lorryman100

Member Since: 01 Oct 2010
Location: Here
Posts: 2686

Two possible causes of your symptoms are the accelerator pedal position sensor and the speed transducer. You can unplug both units and coat them in electrical contact cleaner to dispel moisture and any mineral contamination of the electrical contacts. But if you have access to a diagnostic tool that is capable of showing and recording live data, then monitor the pedal sensors D% and E% to see if the readings coincide with the unwanted power demand. Also monitor the vehicle speed on the tool and see if the readings on the tool coincide with the 10-30mph fluctuations that you see on the speedo.

Click image to enlarge

HTH

Admin note: this post has had its images recovered from a money grabbing photo hosting site and reinstated

19th Oct 2013 11:29pm

LR90XS2011

Member Since: 05 Apr 2011
Location: bickenhill
Posts: 3640

2011 Defender 90 Puma 2.4 XS CSW Galway Green

Id be real worried about the self maintainability future of my 90 without the likes of Lorryman DEFENDER 90 TDCI XS,

I hope everyone is well and your land rovers make you happy

20th Oct 2013 6:36am

Gnasher

Member Since: 22 Aug 2009
Location: Cornwall
Posts: 8

Lorryman, many thanks for your time and the information. I will try to do what you suggest today and I will let you know if it is successful. Thanks again, really appreciate it. If you can't climb on it, don't drive it!

20th Oct 2013 8:46am

Gnasher

Member Since: 22 Aug 2009
Location: Cornwall
Posts: 8

Thanks to tips from Lorryman this fault has now been fixed (hopefully). All of the plugs on the accelerator and speed sensors on the gearbox were eventually taken apart. They were spotless and I could not see any water in them but I cleaned them with 'electrical' solvent and put them back together.

So far the 'problem' has gone away. Thanks again Lorryman....... If you can't climb on it, don't drive it!

4th Nov 2013 6:13pm

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