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landybear

Member Since: 18 Oct 2015
Location: Tamworth & Worcester
Posts: 134

Nanocom Loosing Connection with engine running

2003 TD5

After living with my temp gauge reading weirdly since I got my 90 some years ago and hardly not using her for the last few years, I've finally started looking into what could be causing this with earthing being my initial thoughts. To investigate, I've got an old Nanocom that I bought for my D2 in 2005 and have found that on the 90 it works perfectly whilst the ignition is on but once the engine starts the Nanocom looses comms with the ecu with what seem corrupted messages.

Does anyone know if there is an issue with the original metal box (usb) Nanocom that causes this or is it another symptom of an issue I have - possible earths causing differential voltages possibly? Not sure if its related but there is oil in the loom - another job on the list!!

Thanks

Paul

Click image to enlarge

Click image to enlarge 2003 Defender TD5 Hardtop (current - work in progress)
2014 Discovery 4 HSE (Current) / 2009 Discovery 3 HSE 2009 (Previous)
Disco 2 Landmark 2004, 2001, 2002 (Previous)
Disco 1 300tdi 1996 & V8i 1995, 200tdi 1993 (previous)
Defender 110 300tdi 1993 (Previous)
Range Rover Vogue 4.6 - 2001 (Previous)
Freelanders TD4 (2001 3 door & 2002 5 door) Previous
90 2.5 then converted to V8i (1990), 90 2.25 then converted to v8 (1986) plus others

24th May 2020 5:55pm

diesel_jim

Member Since: 13 Oct 2008
Location: hiding
Posts: 6031

I have an old metal case one like that. COnnection is a bit hit & miss sometimes. Especially when you start the engine.

24th May 2020 6:30pm

MadTom

Member Since: 10 Sep 2013
Location: Olomouc
Posts: 572

I had this metal Nanocom one, now I have Nanocom Evo and sometimes I use also different diagnostics. All suffers from connection problems in some cars. OBD connector is often dirty or corroded, and is not easy co check and clean.
Nanocom One uses RJ45 connector and this is not very reliable in car environment. "Drobek" = The Small One - Discovery 2, "Blufínek" = The Blue Thing - Defender 130, and for me at least Ford Mondeo

25th May 2020 7:25am

landybear

Member Since: 18 Oct 2015
Location: Tamworth & Worcester
Posts: 134

Thanks for the replies. A bit more research has suggested to reinforce the earth at the obd connector and the Engine ecu to connect together / to the battery earth to ensure the potentials are the same. After a look at the manuals I now have another head scratcher as the ECM earths supposedly all connect and run to stud C0056 under the drivers seat. After a look I have the stud/nuts covered in original paint and no wiring attached. Any idea where the ECM earth point is?

Click image to enlarge

25th May 2020 8:22am

landybear

Member Since: 18 Oct 2015
Location: Tamworth & Worcester
Posts: 134

Problem solved. There wasn’t an earth to the seat box but there was an empty stud under it. After cleaning up the bulkhead earth (behind the expansion bottle) and running an earth direct from the battery to the internal stud on the drivers side of the seat box, I now have no interruptions on the Nanocom and the fuel gauge appears to now be working at last. 2003 Defender TD5 Hardtop (current - work in progress)
2014 Discovery 4 HSE (Current) / 2009 Discovery 3 HSE 2009 (Previous)
Disco 2 Landmark 2004, 2001, 2002 (Previous)
Disco 1 300tdi 1996 & V8i 1995, 200tdi 1993 (previous)
Defender 110 300tdi 1993 (Previous)
Range Rover Vogue 4.6 - 2001 (Previous)
Freelanders TD4 (2001 3 door & 2002 5 door) Previous
90 2.5 then converted to V8i (1990), 90 2.25 then converted to v8 (1986) plus others

25th May 2020 2:35pm

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