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DISCO3.CO.UK > Technical (D4)

Cruise Control Issues
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Danshort86
 


Member Since: 22 Aug 2016
Location: Manchester
Posts: 44

United Kingdom 2010 Discovery 4 3.0 TDV6 XS Auto Indus SilverDiscovery 4
Cruise Control Issues

Looking for some help with my cruise control which has stopped working. When I engage it via the button on the steering wheel all appears well on the dash, notification shows the speed selected and the little green light comes on. The problem being that the cruise control doesn’t actually kick in and the car starts to immediately slow down. Any ideas where it’s going wrong?  
Post #221406827th Feb 2021 4:42 pm
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Hardware
 


Member Since: 28 Jun 2016
Location: Hiding under the M60
Posts: 12697

United Kingdom 2011 Discovery 4 3.0 SDV6 XS Auto Sumatra BlackDiscovery 4

could be the "-" button is being activated ?


try pressing the "+" button ... does dash show set cruise speed changing ?  
Post #221407227th Feb 2021 4:46 pm
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Danshort86
 


Member Since: 22 Aug 2016
Location: Manchester
Posts: 44

United Kingdom 2010 Discovery 4 3.0 TDV6 XS Auto Indus SilverDiscovery 4

Unfortunately not, when I click the + the cruise control display speed increases, but the car still slows (obviously no foot on accelerator)  
Post #221407327th Feb 2021 4:49 pm
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ianm27
 


Member Since: 02 Jun 2016
Location: Hertfordshire
Posts: 2154

England 2012 Discovery 4 3.0 SDV6 GS Auto Orkney GreyDiscovery 4

Sounds like the Cruise Control is not engaging.

You will need to get the codes read to start identifying the problem. Uncle Ray's spare wheel protector
Limo Tint
Blackvue front & rear dashcam
Cruise control switch pack
Bodsy's remote for FBH  
Post #221426528th Feb 2021 2:56 pm
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BrumLee
 


Member Since: 07 Mar 2008
Location: West Midlands
Posts: 1360

United Kingdom 2005 Discovery 3 TDV6 SE Auto Bonatti GreyDiscovery 3

My cruise control has stopped working and I'm getting fault codes P0566 (Speed Control Off Signal) and P0578 (Speed Control multi-function input A circuit is stuck)

I've renewed the steering wheel loom and switch pack, brake pedal switch and clockspring, but still get the same fault codes. The PCM is putting out a 5v and 4.99v signal for the 5v reference circuits, but it's reading a 11.45v supply to the steering wheel switches. I'm getting the following voltages on pressing the buttons;

Battery voltage = 12.6v
'+' = 10.98v
'-' = 9.0v
'RES' = 11.16v
'Off' = 7.0v

So it looks like I'm going to have to look for a short circuit to find out why the voltage is greater than 5 volts at the switch Crying or Very sad Evil or Very Mad Faultmate MSV2 EXTREME
FOXWELL N624 Elite
Hantek 1008c Oscilloscope  
Post #223278427th May 2021 5:44 pm
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galwaygreen
 


Member Since: 30 Oct 2011
Location: plymouth
Posts: 6525

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

cruise control also controls speed of hill decent...plus for faster.... minus for slower.....check that out  
Post #223285927th May 2021 11:54 pm
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