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disco3 won't crank or start
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Briscoe05
 


Member Since: 25 Mar 2019
Location: Lincoln
Posts: 67

United Kingdom 2005 Discovery 3 TDV6 SE Auto Tonga GreenDiscovery 3

gstuart wrote:
Hi

Am no where near as knowledgeable as the other members here so they can correct me if this test would be useful or not

But would it be useful to test the hi/low canbus ohms readings to see if it’s ok

remove the battery , using a multimeter set to ohms and check the Resistance, between

PIN 3 and 11
PIN 6 and PIN 14

Should be 60 ohms on each test

Just clutching at straws and just an idea

Ref ur light error, have u fitted internal Leds

Also read ref the instrument cluster

There’s a plug on the bottom right. Try to move a it a little.
If the problem is from this plug, cluster will go on and off as you touch the plug.


Hopefully u can soon resolve the issue


Hi mate, ref clocks there is only 1 big plug central to the clocks and all appears fine. Ref the ohms check is that on the main ecu? Behind the tcu?
  
Post #214743620th May 2020 8:35 am
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Briscoe05
 


Member Since: 25 Mar 2019
Location: Lincoln
Posts: 67

United Kingdom 2005 Discovery 3 TDV6 SE Auto Tonga GreenDiscovery 3

rangehelper wrote:
Hi, Briscoe05

If the dashboard is serviceable, then you need to look for damage to the electrical wiring (can-bus) (yellow-black twisted wires). In the thresholds, in the harness under the car. Watch carefully with your hands and eyes. I'm sorry I can't help you. If I were in the UK...... it certainly would have helped.


Hi rangehelper, I checked the wire in your photo yesterday and disconnect the plugs and reconnect. Still no different thank you for that.

Someone said there is some wire inside passenger side wing behind the arch liner?
Thanks nick
  
Post #214743720th May 2020 8:38 am
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Briscoe05
 


Member Since: 25 Mar 2019
Location: Lincoln
Posts: 67

United Kingdom 2005 Discovery 3 TDV6 SE Auto Tonga GreenDiscovery 3

Hot Tub wrote:
Have you a second key Question Do you hear any noises from solenoid, fuel pump when ignition is turned on Question just a couple of thoughts might point in the right direction. Neutral


No nothing mate, just clicking from relays behind the glove box
  
Post #214743920th May 2020 8:44 am
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gstuart
 


Member Since: 21 Oct 2016
Location: kent
Posts: 13657

United Kingdom 2005 Discovery 3 TDV6 Base 7 Seat Auto Java BlackDiscovery 3

Briscoe05 wrote:
gstuart wrote:
Hi

Am no where near as knowledgeable as the other members here so they can correct me if this test would be useful or not

But would it be useful to test the hi/low canbus ohms readings to see if it’s ok

remove the battery , using a multimeter set to ohms and check the Resistance, between

PIN 3 and 11
PIN 6 and PIN 14

Should be 60 ohms on each test

Just clutching at straws and just an idea

Ref ur light error, have u fitted internal Leds

Also read ref the instrument cluster

There’s a plug on the bottom right. Try to move a it a little.
If the problem is from this plug, cluster will go on and off as you touch the plug.


Hopefully u can soon resolve the issue


Hi mate, ref clocks there is only 1 big plug central to the clocks and all appears fine. Ref the ohms check is that on the main ecu? Behind the tcu?


Hiya

Apologises as I should have said , ok ref the instrument panel

It’s the OBD2 socket , enclosed a basic number layout , will get a better one for u

Just need to disconnect ur main battery , then set multimeter onto ohms

It’s just on the off chance to test ur canbus system and if it’s ok
  

Last edited by gstuart on 20th May 2020 10:11 am. Edited 1 time in total 
Post #214746620th May 2020 10:01 am
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gstuart
 


Member Since: 21 Oct 2016
Location: kent
Posts: 13657

United Kingdom 2005 Discovery 3 TDV6 Base 7 Seat Auto Java BlackDiscovery 3

Found a better picture , as u look at the connector numbers , the last number tells u the PIN number

so battery disconnected , meter on ohms, should have 60ohms between those numbered pins

PIN 3 and Pin 11

PIN 6 and PIN 14

Hope it helps


Click image to enlarge



Click image to enlarge
   
Post #214746720th May 2020 10:09 am
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gstuart
 


Member Since: 21 Oct 2016
Location: kent
Posts: 13657

United Kingdom 2005 Discovery 3 TDV6 Base 7 Seat Auto Java BlackDiscovery 3

Hope it makes life easier to just show the PIN numbers for u

Click image to enlarge
   
Post #214747020th May 2020 10:16 am
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Briscoe05
 


Member Since: 25 Mar 2019
Location: Lincoln
Posts: 67

United Kingdom 2005 Discovery 3 TDV6 SE Auto Tonga GreenDiscovery 3

Ah ha, eureka moment. This may make some sense. If I plug the diagnostic machine in to the obd port and do an obd scan it doesnt connect I get a communication failure. I have to access it via the cable and manually selecting vehicle make model etc then it will scan for errors. Idea Rolling Eyes

Thanks for this I will check it out later on and post back the results.
Cheers for you help. Thumbs Up
  
Post #214761820th May 2020 6:05 pm
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gstuart
 


Member Since: 21 Oct 2016
Location: kent
Posts: 13657

United Kingdom 2005 Discovery 3 TDV6 Base 7 Seat Auto Java BlackDiscovery 3

Ur so welcome and hope the little bit of info contributed with everyone else’s will help and indeed Plse let us know how u get on

Did look and on the low canbus the ohms resisters are in a central junction box and instrument panel

Hi canbus the ohms resisters are in the instrument panel and ABS module

Will be interesting to see what u find in the terms of ohm readings Thumbs Up
   
Post #214782421st May 2020 2:09 pm
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gstuart
 


Member Since: 21 Oct 2016
Location: kent
Posts: 13657

United Kingdom 2005 Discovery 3 TDV6 Base 7 Seat Auto Java BlackDiscovery 3

Briscoe05 wrote:
rangehelper wrote:
Hi, Briscoe05

If the dashboard is serviceable, then you need to look for damage to the electrical wiring (can-bus) (yellow-black twisted wires). In the thresholds, in the harness under the car. Watch carefully with your hands and eyes. I'm sorry I can't help you. If I were in the UK...... it certainly would have helped.


Hi rangehelper, I checked the wire in your photo yesterday and disconnect the plugs and reconnect. Still no different thank you for that.

Someone said there is some wire inside passenger side wing behind the arch liner?
Thanks nick


Ref the wiring connectors

There’s some that run from the engine bay via the passengers side wheel arch, hidden behind the plastic liner

Another large connector near to the compressor , more near the upper wishbone

Hope that helps
   
Post #214782521st May 2020 2:12 pm
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gstuart
 


Member Since: 21 Oct 2016
Location: kent
Posts: 13657

United Kingdom 2005 Discovery 3 TDV6 Base 7 Seat Auto Java BlackDiscovery 3

Found the connectors that ref the low canbus

So the ohms resisters are , instrument panel and passenger side glove box central fuses

Alas pic shows LHD


Click image to enlarge


Click image to enlarge


Click image to enlarge



Click image to enlarge
   
Post #214782621st May 2020 2:17 pm
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gstuart
 


Member Since: 21 Oct 2016
Location: kent
Posts: 13657

United Kingdom 2005 Discovery 3 TDV6 Base 7 Seat Auto Java BlackDiscovery 3

Hi canbus circuit

Same again, one in the instrument panel, other in the ABS module



Click image to enlarge



Click image to enlarge
   
Post #214782921st May 2020 2:24 pm
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Dazz360
 


Member Since: 03 Sep 2016
Location: West Mids Walsall
Posts: 871

United Kingdom 2005 Discovery 3 TDV6 HSE Auto Bonatti GreyDiscovery 3

Have you checked the earthing strap behind the drivers front wheel going from started to chassis then to body panel as I had exactly the same problem just needed undoing, cleaning the tightening back up
 Metal auto sump & fluid change (3 hrs)
LR door puddle projectors (10 mins)
Tinted Bonnet wind deflector (10 mins)
All Intercooler pipes and Tbolts (2hrs)
3 injectors replaced so far (30mins)
Sunroof drain pipes both sides 2.5 hrs)
Rear discs, shoes,pads,callipers,flexi hoses, rigid brake line, n/s upper hub carrier bush and rear n/s upper arm (13hrs over 2 days) 
 
Post #214797621st May 2020 11:11 pm
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gstuart
 


Member Since: 21 Oct 2016
Location: kent
Posts: 13657

United Kingdom 2005 Discovery 3 TDV6 Base 7 Seat Auto Java BlackDiscovery 3

Great call , as indeed always forget some of the simple things Bow down

Funny enough , was surprised to find that when I removed my front wheel arch liner to finish spraying the arches with Dinitrol
   
Post #214797921st May 2020 11:20 pm
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Briscoe05
 


Member Since: 25 Mar 2019
Location: Lincoln
Posts: 67

United Kingdom 2005 Discovery 3 TDV6 SE Auto Tonga GreenDiscovery 3

So earth strap looks ok.

I did the ohms check and pin 3 and pin 11 = 60 ohms
Pin 6 and 14 is 120 ohms? Big Cry Shocked Question
  
Post #214817922nd May 2020 7:50 pm
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Hot Tub
 


Member Since: 15 Aug 2017
Location: Milton Keynes
Posts: 1071

England 2009 Discovery 3 TDV6 HSE Auto Zermatt SilverDiscovery 3

Looks like you need to check what is connected between the two pins which give you 120 ohms if they should read 60 ohms. Not gone OC (open circuit) as would mega ohms. Need to confirm what healthy reading is. But you saying about having to connect else where would help support this area being the potential fault. Try google search for high resistance on these two terminals somebody will have been there before hopefully put it on the Net Thumbs Up
 Welsh Collie Chauffeur Service To Barney & Rooney.  
Post #214819822nd May 2020 8:54 pm
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