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My Disco cut out whilst driving and won't start?!
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TDi.Si
 


Member Since: 09 May 2013
Location: Glos, GL6
Posts: 44

United Kingdom 2006 Discovery 3 TDV6 S Manual Bonatti GreyDiscovery 3

Thanks for all the help people! She now starts Very Happy with the transmission control unit disconnected, obviously lots of faults lit up.
Going to check the wiring thoroughly from here. Can I check voltage or resistance on this module to rule out wiring issues? Guessing it will need coding if a replacement is required?
  
Post #127286621st Apr 2014 10:34 am
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TDi.Si
 


Member Since: 09 May 2013
Location: Glos, GL6
Posts: 44

United Kingdom 2006 Discovery 3 TDV6 S Manual Bonatti GreyDiscovery 3

Right now I'm really confused! Re connected the module to defiantly make sure it was that, car started with no problems at all Rolling Eyes just tried it again after it's been sat about 3 hours and won't start again, disconnect the TCM and it still won't start! Big Cry
I'm guessing it's a broken wire somewhere causing this? Guess it only makes a circuit occasionally. I've read that there are spliced canbus joints around the loom, does anyone have any pointers as to where to start looking?
  
Post #127303921st Apr 2014 6:35 pm
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Disco_Mikey
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Member Since: 29 May 2007
Location: Dundee, Scotland
Posts: 15119

Scotland 2005 Discovery 3 TDV6 HSE Auto Cairns BlueDiscovery 3

The splice joints are not in a specified location. Only in a general vicinity...


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Post #127304321st Apr 2014 6:43 pm
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Robbie
 


Member Since: 05 Feb 2006
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United Kingdom 2013 Discovery 4 3.0 SDV6 HSE Auto Baltic BlueDiscovery 4

Slightly more than a general vicinity as the numbers at the end of the wire descriptor is the distance between the two points in millimetres.

So if you find the connector and the next point is a splice then trace the wiring from the connector for 'x' mm to find the splice. If you have more than one starting point then you can triangulate the location with reasonable accuracy.

If you make a habit of reading the distance even when you know the location of the connector or splice you brain becomes reasonably adept at visualising where the joins are. This is handy for me as I am more thumbs than fingers when it comes to removing bits of trim without loosing all the clips.

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Post #127305421st Apr 2014 7:14 pm
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caverD3
 


Member Since: 02 Jul 2006
Location: Oberon, NSW
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Australia 2012 Discovery 4 3.0 SDV6 SE Auto Fuji WhiteDiscovery 4

Is the TCM in the engine bay behind the battery?
If that is the one they can fail due to water ingress. Check the connectors?
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Post #127314722nd Apr 2014 12:46 am
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TDi.Si
 


Member Since: 09 May 2013
Location: Glos, GL6
Posts: 44

United Kingdom 2006 Discovery 3 TDV6 S Manual Bonatti GreyDiscovery 3

All good advise so far! Thanks very much for those diagrams! I figure it must be a break in a wire which was disturbed when i removed the tcm. Yes it the one behind the battery, its clean and dry, i even took it apart to check inside for moisture, but its all good.
It seams im jinxed with cars, my VW has a electrical fault too, albeit it still runs fine!
  
Post #127327722nd Apr 2014 11:22 am
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TDi.Si
 


Member Since: 09 May 2013
Location: Glos, GL6
Posts: 44

United Kingdom 2006 Discovery 3 TDV6 S Manual Bonatti GreyDiscovery 3

Im at a bit of a loss with this now. It seams as if the car will run after a hard reset for an un determined amount of time then the hazards come on and it lowers, it doesnt always cut the engine though! It then will sometimes start after its gone to sleep, or a hard reset will work, other times it wont reset atall!

Are those diagrams from topix? I may have to subscribe if so to get a clearer image.

Any suggestions are welcome as i really do like the car, but its looking ever more likey to be sold as a non runner Sad
  
Post #127610328th Apr 2014 7:02 am
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Disco_Mikey
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Member Since: 29 May 2007
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Scotland 2005 Discovery 3 TDV6 HSE Auto Cairns BlueDiscovery 3

Had a very similar fault. EPB module was dropping out of the canbus network, after the car was running for 90 seconds. Once whatever it was in the module had cooled down, it would restart again
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Unit 3, 42 Baird Avenue
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Software Updates+Upgrades:
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Post #127610628th Apr 2014 7:11 am
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TDi.Si
 


Member Since: 09 May 2013
Location: Glos, GL6
Posts: 44

United Kingdom 2006 Discovery 3 TDV6 S Manual Bonatti GreyDiscovery 3

I guess that would make scense! Ill have to time it, seams to be around 15 mins. Would it show up as a logged code if i was to scan it with a decent scanner?
  
Post #127611928th Apr 2014 7:46 am
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Disco_Mikey
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Member Since: 29 May 2007
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Scotland 2005 Discovery 3 TDV6 HSE Auto Cairns BlueDiscovery 3

No, a scanner will not pinpoint the fault.

Disco_Mikey wrote:
No, comes down to good old fashioned diagnostics Thumbs Up

You need to break down the CAN-BUS wiring into sections, and isolate them. If the wiring is all fine, then start isolating modules, one by one Thumbs Up
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Unit 3, 42 Baird Avenue
Dundee
DD2 3TN

Alive Tuning Authorised Dealer - Performance Tuning + EGR Delete

Servicing + Repairs / Autobox Flushing / Fault Diagnostics / EU3+EU4 EGR Blanking / Timing Belt + Oil Pump Replacement

Software Updates+Upgrades:
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My D3 Build Thread 
 
Post #127612028th Apr 2014 7:48 am
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TDi.Si
 


Member Since: 09 May 2013
Location: Glos, GL6
Posts: 44

United Kingdom 2006 Discovery 3 TDV6 S Manual Bonatti GreyDiscovery 3

So its a case of litrally unplugging the suspect module and running/driving the car to see if it cures it? Or is there a better way?
I dont mind putting the time in, just want to make sure ive got a rough idea of what to do.
  
Post #127613228th Apr 2014 8:29 am
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Disco_Mikey
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Member Since: 29 May 2007
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Posts: 15119

Scotland 2005 Discovery 3 TDV6 HSE Auto Cairns BlueDiscovery 3

You have to isolate the module/wiring, and complete the canbus circuit, to allow the car to start Thumbs Up
 MMP Land Rover - Land Rover Specialist
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Unit 3, 42 Baird Avenue
Dundee
DD2 3TN

Alive Tuning Authorised Dealer - Performance Tuning + EGR Delete

Servicing + Repairs / Autobox Flushing / Fault Diagnostics / EU3+EU4 EGR Blanking / Timing Belt + Oil Pump Replacement

Software Updates+Upgrades:
4x4 Info Enable / Sat Nav OTM / 3 Flash indicators / D4 Timed Climate Retrofit

My D3 Build Thread 
 
Post #127624428th Apr 2014 1:34 pm
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TDi.Si
 


Member Since: 09 May 2013
Location: Glos, GL6
Posts: 44

United Kingdom 2006 Discovery 3 TDV6 S Manual Bonatti GreyDiscovery 3

Well it would appear to be a wiring fault. If I start the car car move the wires in the black connector behind the passenger side rear wheel it instantly lowers, hazards etc! Seam to be getting somewhere now!
Big thanks to everyone especially Disco_Mikey Thumbs Up
  
Post #127645428th Apr 2014 7:56 pm
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Robbie
 


Member Since: 05 Feb 2006
Location: Waiting for my old avatar to be allowed back... we miss her!
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United Kingdom 2013 Discovery 4 3.0 SDV6 HSE Auto Baltic BlueDiscovery 4

Ah yes, a favourite place for wiring issues. I feel some heatshrunk crimp action coming.

Glad you found the source.

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 Land Rover - Turning Drivers into Mechanics Since 1948

Battery & Quiescent Current Drain Testing

Diagnostics for:
Defender, FL2, D3, D4, Evoque, RRS & FFRR
A not-for-profit enterprise


 
 
Post #127658229th Apr 2014 5:48 am
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NoDo$h
 


Member Since: 02 May 2006
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United Kingdom 2008 Discovery 3 TDV6 SE Auto Zermatt SilverDiscovery 3

One of the most reasoned and thorough diagnostic threads on here - this careful approach will always yield results in the end. This ought to be a "sticky" Thumbs Up
  
Post #127658729th Apr 2014 6:08 am
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