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DISCO3.CO.UK > Technical (D3)

Engine will not crankover
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 10485

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

You will have to check the 2 pins to the starter relay. See which one is at fault.
One is driven from gearbox. Other from eng ecu. IIRC
Also momentary bypass relay with ignition on and see if crank sensor now works and starts  
Post #224705817th Aug 2021 5:21 pm
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 10485

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

https://www.disco3.co.uk/forum/topic167285...p;start=15  
Post #224706217th Aug 2021 5:27 pm
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PROFSR G
 


Member Since: 06 Mar 2017
Location: Lost
Posts: 4874

Ukraine 2009 Discovery 3 TDV6 Commercial XS Auto Stornoway GreyDiscovery 3

Is the immobiliser lamp light up and then extinguish when you turn on the ignition? yµ (idµ - eAµ) ψ=mψ

  
Post #224706317th Aug 2021 5:30 pm
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Skandimike
 


Member Since: 26 Aug 2010
Location: Billingham
Posts: 51

England 2006 Discovery 3 TDV6 HSE Auto Zambezi SilverDiscovery 3

Pete K wrote:
The one in the plastic case on the + battery terminal.

Starter should still click though


Pete ive read an older post you wrote to Jonathan crisp. It looks a similar issue to mine so will check this out tomorrow.

Maybe the gearbox removal/ refit is a red herring I'll follow your post With Jon as its good logical faultfinding Mike  
Post #224706717th Aug 2021 6:15 pm
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Skandimike
 


Member Since: 26 Aug 2010
Location: Billingham
Posts: 51

England 2006 Discovery 3 TDV6 HSE Auto Zambezi SilverDiscovery 3

[quote="Pete K"]You will have to check the 2 pins to the starter relay. See which one is at fault.
One is driven from gearbox. Other from eng ecu. IIRC
Also momentary bypass relay with ignition on and see if crank sensor now works and starts[/quote

Thanks Pete. Do have a wiring diagram of this circuit Mike  
Post #224707217th Aug 2021 7:07 pm
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 10485

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

I think there is a link in the linked post  
Post #224709117th Aug 2021 8:14 pm
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Skandimike
 


Member Since: 26 Aug 2010
Location: Billingham
Posts: 51

England 2006 Discovery 3 TDV6 HSE Auto Zambezi SilverDiscovery 3

Hi Pete
Checked this morning and recorded
12.65v on pin 3
0 on pin five

Bridged this an starter operated ok

But recorded next to nothing on pins 1 and 2

0.01 and 0.03 respectively.

Unfortunately I could not open the link for you previously posted wiring diagram Mike  
Post #224716218th Aug 2021 10:30 am
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 10485

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

https://www.disco3.co.uk/forum/wiring-diag...ng+diagram

PDF page 30, 38


So assuming the engine ecu is awake, imboliser satisfied, and key held in crank position, the UR Blue/Red (or purple as it looks on diagram) will connect to a good ground signal (in the engine ECU) to activate the relay.


The relay coil input from the left should be:

Automatic: GO Green/Orange +12v with the ignition on and gear selector in P or N
Manual: WR White/Red +12v when the key is held in crank position 

Last edited by Pete K on 18th Aug 2021 11:24 am. Edited 4 times in total 
Post #224716418th Aug 2021 10:48 am
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 10485

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

I think you need to try this from the other thread.
This then proves the gearbox input is ok or not

Quote:
You could also try turning on the ignition
monitoring pin 1 of the relay.
Should be 11V according to you.
Then moving the gear selector to D

Does it go to 0V ?
  
Post #224716718th Aug 2021 10:55 am
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 10485

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

I would:

Put the gearbox in P
turn the ignition on
bypass the relay.

If the engine starts, at least it proves the engine ecu has power and is awake  
Post #224717318th Aug 2021 11:33 am
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Skandimike
 


Member Since: 26 Aug 2010
Location: Billingham
Posts: 51

England 2006 Discovery 3 TDV6 HSE Auto Zambezi SilverDiscovery 3

Pete K wrote:
I think you need to try this from the other thread.
This then proves the gearbox input is ok or not

Quote:
You could also try turning on the ignition
monitoring pin 1 of the relay.
Should be 11V according to you.
Then moving the gear selector to D

Does it go to 0V ?


I checked the no 1 terminal but no signal on any position.

I the followed your advice and tried to start but although cranked did not start.

I use a faultmate 2 for diagnostics but I can connect to engine ecu but it will not connect to Transmission ecu. Mike  
Post #224717718th Aug 2021 12:13 pm
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aja4x4
 


Member Since: 14 Apr 2019
Location: Westbury
Posts: 2462

United Kingdom 2005 Discovery 3 TDV6 SE Auto Zambezi SilverDiscovery 3

Try removing and cleaning the gearbox wiring connector it might just be a bad connection Andrew

D3 2.7tdv6 2005
D4 3.0 SDV6 Commercial died and gone to LR heaven
D5 3.0 SDV6 HSE  
Post #224718418th Aug 2021 12:53 pm
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Skandimike
 


Member Since: 26 Aug 2010
Location: Billingham
Posts: 51

England 2006 Discovery 3 TDV6 HSE Auto Zambezi SilverDiscovery 3

Is that the multi plug I the back of the gearbox or the plugs on the selector
O Mike  
Post #224718618th Aug 2021 1:07 pm
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aja4x4
 


Member Since: 14 Apr 2019
Location: Westbury
Posts: 2462

United Kingdom 2005 Discovery 3 TDV6 SE Auto Zambezi SilverDiscovery 3

Yes Andrew

D3 2.7tdv6 2005
D4 3.0 SDV6 Commercial died and gone to LR heaven
D5 3.0 SDV6 HSE  
Post #224719118th Aug 2021 1:30 pm
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Skandimike
 


Member Since: 26 Aug 2010
Location: Billingham
Posts: 51

England 2006 Discovery 3 TDV6 HSE Auto Zambezi SilverDiscovery 3

Pete K wrote:
I would:

Put the gearbox in P
turn the ignition on
bypass the relay.

If the engine starts, at least it proves the engine ecu has power and is aw
ake


Looks like I may have found the issue.
Looks like water damage to the gear selector plug and circuit board. Problem is getting a replacement Mike  
Post #224730519th Aug 2021 11:03 am
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