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Cruise control acceleration
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Jadams
 


Member Since: 12 Mar 2018
Location: Stornoway
Posts: 2

United Kingdom 2009 Discovery 4 TDV6 HSE Auto Bali BlueDiscovery 4
Cruise control acceleration

Hi folks I’m new here. I’ve had a good search but not found anybody with the same issue.

My 2009 discovery 4 hse accelerates when you activate cruise control, regardless of the speed setting,
Normally it drops a gear and goes till you cancel it.

Any suggestions?
  
Post #192515912th Mar 2018 1:58 am
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200TDi
 


Member Since: 30 Dec 2012
Location: Annan/Portsmouth
Posts: 282

United Kingdom 2007 Discovery 3 TDV6 XS Auto Java BlackDiscovery 3

sounds like the "+" button is shorted or stuck maybe
 Pete

1965 S2a with Galv Marslands Chassis - Sold (BIG mistake)
1993 200TDi GS Green 5 Seat Manual - Broken
1993 200TDi GS Grey 7 Seat manual - Sold To Defender Owner to Use Engine
1999 TD5 GS Blenheim Silver 5 Seat Manual - Broken
1999 TD5 GS Oxford Blue 7 Seat Auto - Sold
1999 TD5 ES Epsom Green 6 Seat Auto - Sold
2007 D3 2.7 TDV6 XS Java Black 7 Seat Auto

1999 Swift Classic Coronette
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IID Tool BT 
 
Post #192517112th Mar 2018 7:53 am
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Jadams
 


Member Since: 12 Mar 2018
Location: Stornoway
Posts: 2

United Kingdom 2009 Discovery 4 TDV6 HSE Auto Bali BlueDiscovery 4

The selected cruise speed would rise then, mine can be set at 40 but continues to accelerate till you chicken out 😂
  
Post #192547012th Mar 2018 10:07 pm
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a.macneil
 


Member Since: 25 Oct 2020
Location: Glasgow
Posts: 1

United Kingdom 2011 Discovery 4 3.0 SDV6 HSE Auto Bali BlueDiscovery 4

Hi Jadams, did you ever get to the bottom of your accelerating D4. I have the same issue. When you set the cruise control the car goes for it.

I noticed on other forums that there is a bit of a link between the parking break and the cruise control. I have just had the plastic cogs in the marking module replaced and it is since I got it back that I have noticed the issue with the cruise control.

TIA
  
Post #220610228th Jan 2021 4:14 pm
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Karl Mitchell
 


Member Since: 11 Mar 2021
Location: Somerset
Posts: 29

United Kingdom 2010 Discovery 4 3.0 TDV6 XS Auto Stornoway GreyDiscovery 4
Cruise control acceleration

I have this issue too. Did anyone find a fix?
  
Post #223850826th Jun 2021 7:46 pm
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Green Land Rover
 


Member Since: 21 Oct 2017
Location: Stourbridge
Posts: 309

United Kingdom 2014 Discovery 4 3.0 SDV6 HSE Auto Aintree GreenDiscovery 4

Do you mean when you resume or just when you press set?

I always find the acceleration too aggressive when resuming cruise speed.

My way around it is to accelerate to speed at a reasonable rate and then when i get to the speed I want hit the resume or set button accordingly.
 Discovery 4 HSE - Aintree Green
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www.greenlandrover.uk

 
 
Post #223851126th Jun 2021 8:15 pm
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Karl Mitchell
 


Member Since: 11 Mar 2021
Location: Somerset
Posts: 29

United Kingdom 2010 Discovery 4 3.0 TDV6 XS Auto Stornoway GreyDiscovery 4

When using set function, speed just keeps on creeping up. Not as aggressively as resume but like a moderate throttle press. Not as strong as just keeping set pressed.
I've tried using the cruise control buttons to navigate the iid tool menus and it seems to work as expected. So don't think the switchpack is at fault.
  
Post #223851726th Jun 2021 9:09 pm
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gstuart
 


Member Since: 21 Oct 2016
Location: kent
Posts: 12137

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

May i ask a daft question please with relation to the cruise control

Could a faulty wheel speed sensor or maybe a faulty brake pedal switch cause the above issues plse

Or could variable speed cruise control create the vehicle to slowly speed up

What about non standard tyre sizes ??

Just always find things like this very interesting

Hope u didn’t mind me asking , Many thks Thumbs Up
  

Last edited by gstuart on 26th Jun 2021 11:01 pm. Edited 1 time in total 
Post #223852426th Jun 2021 10:55 pm
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Karl Mitchell
 


Member Since: 11 Mar 2021
Location: Somerset
Posts: 29

United Kingdom 2010 Discovery 4 3.0 TDV6 XS Auto Stornoway GreyDiscovery 4

I think it is unlikely because the speed is read digitally by the ipc display. If an abs sensor was faulty a dtc would show.
  
Post #223852526th Jun 2021 10:59 pm
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gstuart
 


Member Since: 21 Oct 2016
Location: kent
Posts: 12137

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

Many thanks Karl,

Hope u didn’t mind me asking , just always like to learn new things of how things work

Are the sensors that are fitted passenger front and drivers rear also the ABS sensors plse , thanks

Funny enough downloaded the D4 steering wheel cruise control manual as I fitted a D4 steering wheel in my D3 , as I assumed when active it would stay the same speed down hill, but alas it stated that was normal, of course understand the D4 is a completely different system and different in what ur discussing


Click image to enlarge



Click image to enlarge
  

Last edited by gstuart on 26th Jun 2021 11:14 pm. Edited 2 times in total 
Post #223852626th Jun 2021 11:03 pm
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Karl Mitchell
 


Member Since: 11 Mar 2021
Location: Somerset
Posts: 29

United Kingdom 2010 Discovery 4 3.0 TDV6 XS Auto Stornoway GreyDiscovery 4

Abs sensors are fitted.to all wheels and use a reluctor ring to measure rotation. If a wheels slows down brake pressure is removed to avoid lock up, or in the special programs for off road, the abs sensor.can see wheels.spinning through loss 9f traction and then apply brakes to just that wheel. Doing this transfers all torque to wheel doing the work on the same axle.
  
Post #223852726th Jun 2021 11:10 pm
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gstuart
 


Member Since: 21 Oct 2016
Location: kent
Posts: 12137

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

Many thks and is appreciated , Bow down

like a doughnut ref those wires front left and rear right I was thinking about are the brake pad wear sensors

I’ll hold my head in shame , apologises
   
Post #223852826th Jun 2021 11:19 pm
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Karl Mitchell
 


Member Since: 11 Mar 2021
Location: Somerset
Posts: 29

United Kingdom 2010 Discovery 4 3.0 TDV6 XS Auto Stornoway GreyDiscovery 4

No probs, we all do it lol
If you want to keep a steady speed downhill, use hill descent control and modify speed with cruise control plus or minus. At least that is how it works on a d4. Just don't go mad on a big hill or the brakes will get quite hot
  
Post #223852926th Jun 2021 11:25 pm
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gstuart
 


Member Since: 21 Oct 2016
Location: kent
Posts: 12137

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

Many thks Bow down

That’s a good idea and understand where ur coming from , as a side note when I’ve gone down very steep hills (without cruise control) being an auto I’ve normally put it into sport and taken it down a gear manually
   
Post #223853026th Jun 2021 11:32 pm
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galwaygreen
 


Member Since: 30 Oct 2011
Location: plymouth
Posts: 6387

United Kingdom 2016 Discovery 4 3.0 TDV6 Graphite LE Auto Loire BlueDiscovery 4

as karl is saying...the buttons also enable you to adjust hill decent speed
  
Post #223853427th Jun 2021 12:10 am
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