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Not cranking with key
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jonathanCrisp
 


Member Since: 27 Apr 2015
Location: UK
Posts: 24

2005 Discovery 3 4.4 V8 HSE Auto Adriatic BlueDiscovery 3

I'm just wondering if i've got some sort of issue between point C0570-34 GO,0.5D and point SJ592 GO,0.5D in the following link ->

http://www.disco3.co.uk/gallery/albums/use...ntrol.tiff

The green wire between the relay and the splice.

Would that explain why ->

1. the P/N sensor seems to work (i can feel the gear lever nudge when i press the brake) and and
2. the ECM seems to be ok (engine runs fine and i have 5v reference voltages on the couple of sensors that i checked.
3. Pin 2 doesn't go to ground on crank (if indeed pin2 is the green wire)
  
Post #18986537th Jan 2018 2:16 pm
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jonathanCrisp
 


Member Since: 27 Apr 2015
Location: UK
Posts: 24

2005 Discovery 3 4.4 V8 HSE Auto Adriatic BlueDiscovery 3

M3DPO wrote:
Could it be the brake peddle switch?


Not sure if this is a valid test but ->

If i put my hand on the gear lever and press the brake pedal i can feel the lock/inhibitor switch operate.
  
Post #18986557th Jan 2018 2:20 pm
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 10337

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

ok maybe an IID would be of help

I was thinking a corroded pin on the ecu plug maybe?

The transfer box module pins next to it have been known to corrode.


Yeah brake switch isn't the issue
  
Post #18986717th Jan 2018 3:03 pm
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 10337

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

To answer this, you need to look at the manual transmission wiring diagrams.

looking on page 90 of some diagrams

The left coil pin still goes to the ecm
The right coil pin is different. Rather than being colour GO in an auto
its WR on a manual and heads to the CJB pin 30.
GOES TO that fuse 60 and IS +12V WHEN KEY TO CRANK POSITION



Notes

Relay 18 | Ignition On | Ignition cranked
=============================
Pin 2 | 0.5v | 0.5v
Pin 1 | 10.7v | 10.7v
 

Last edited by Pete K on 18th Aug 2021 10:04 am. Edited 2 times in total 
Post #18986767th Jan 2018 3:19 pm
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jonathanCrisp
 


Member Since: 27 Apr 2015
Location: UK
Posts: 24

2005 Discovery 3 4.4 V8 HSE Auto Adriatic BlueDiscovery 3

I didn’t state it explicitly but mine’s an auto
  
Post #18986787th Jan 2018 3:23 pm
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 10337

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

yes but if you look at a manual car (which is simpler) you can understand what's happening

see above


So your problem is a missing earth from the engine control module.


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

Goes it go to 0V ?
  
Post #18986797th Jan 2018 3:27 pm
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jonathanCrisp
 


Member Since: 27 Apr 2015
Location: UK
Posts: 24

2005 Discovery 3 4.4 V8 HSE Auto Adriatic BlueDiscovery 3

Ah - I see.

From the drawing in my link it looks like Fuse 60 goes to the crank pin on the ECU.
  
Post #18986927th Jan 2018 4:04 pm
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jonathanCrisp
 


Member Since: 27 Apr 2015
Location: UK
Posts: 24

2005 Discovery 3 4.4 V8 HSE Auto Adriatic BlueDiscovery 3

Pete K wrote:
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

Goes it go to 0V ?


Yes, that’s a good idea. I’ll try that. Thanks Thumbs Up
  
Post #18986937th Jan 2018 4:07 pm
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jonathanCrisp
 


Member Since: 27 Apr 2015
Location: UK
Posts: 24

2005 Discovery 3 4.4 V8 HSE Auto Adriatic BlueDiscovery 3

yep...pin 1 goes to 0.013v when i select Drive.

So looks like a dodgy start relay signal on the ECU or a dodgy purple wire from the ECU to pin 2.

Or a dodgy green wire from the splice to P/N pin on the ECU
  
Post #18987017th Jan 2018 4:34 pm
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 10337

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

I would rule out the green.

The ecu might use it for idle speed control.
  
Post #18987107th Jan 2018 4:51 pm
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jonathanCrisp
 


Member Since: 27 Apr 2015
Location: UK
Posts: 24

2005 Discovery 3 4.4 V8 HSE Auto Adriatic BlueDiscovery 3

Right’O - thanks again for your replies.

Think it’s definitely narrowed down to 1 or 2 possibilities now.

Much appreciated.

Will update the thread when it gets sorted for future reference
  
Post #18987207th Jan 2018 5:11 pm
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jonathanCrisp
 


Member Since: 27 Apr 2015
Location: UK
Posts: 24

2005 Discovery 3 4.4 V8 HSE Auto Adriatic BlueDiscovery 3

Got my new iid tool yesterday.

Anyone know what this dtc is?

B1BA0-66 (6C) excessive challenge requests or start attempt in storage mode - algorithm based failure - signal has too many transitions/events

Any chance it’s related to my problem?
  
Post #190030311th Jan 2018 8:49 pm
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jonathanCrisp
 


Member Since: 27 Apr 2015
Location: UK
Posts: 24

2005 Discovery 3 4.4 V8 HSE Auto Adriatic BlueDiscovery 3

...so it looks like it was the wire after all - from pin2 on the R18 starter relay to the connector C0635 pin51 for the ECU.

Looks like we had a mouse make it's nest in the BJB - under the fuses and relays.

Thanks again for replies and help Thumbs Up

  
Post #190300618th Jan 2018 12:02 pm
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 10337

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

glad you found it, and an easy fix
  
Post #190300918th Jan 2018 12:07 pm
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jonathanCrisp
 


Member Since: 27 Apr 2015
Location: UK
Posts: 24

2005 Discovery 3 4.4 V8 HSE Auto Adriatic BlueDiscovery 3

yep - all fixed and sorted now.
cheers Thumbs Up
  
Post #190301018th Jan 2018 12:09 pm
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