Member Since: 13 Mar 2012
Location: Cherrybrook, NSW
Posts: 30
down hill, command shift unable limited to use engine break
Hi guys,
I just bought a 05 D3 TDV6. All seems fine just found when go downhill, I want to use engine break and put command shift to 2nd gear. when the rev is over 4K rpm, it automatically jumps to 3rd gear and i'm not able to shift to 2nd gear manually.
Since the car is still in warranty (dealer provide 3 months of compulsory warranty), is it transmission issue and how can I show the symptom to the dealer?
Depends how steep the hill is you are trying to go down as to how effective engine braking is.
But if the car is picking up speed and is going over a safe rev limit, then it will change gear, not a fault. Also won't go up or down a gear if it will put the engine into the ewrong rev range.
All normal IMHO.Mark.
2006, D3 SE Auto - gone but not forgotten.
2014 BMW 530d M Sport Tourer.
1977 Triumph Spitfire 1500
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7th Mar 2013 7:54 am
Robbie
Member Since: 05 Feb 2006
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Yep gearbox is protecting itself so you need to tweak your driving technique for whatever conditions you are facing.
4000 rpm+ through engine braking must sound horrible.Land Rover - Turning Drivers into Mechanics Since 1948
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7th Mar 2013 8:50 am
M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8108
What would you do in the same situation with a manual?- if you continued without changing up or braking you would altamately wreck the engine, there is no better method of reducing speed than using the brakes.
HDC speed can be adjusted by using the cruise control buttons if you have them It can when others can't,
It will when others won't,
It goes where others don't.
7th Mar 2013 9:35 am
DG Site Moderator
Member Since: 12 Dec 2005
Location: The Gaff
Posts: 50934
In high range the box will change up in Command shift if the rev threshold is met. In low range it will not change and holds the selected gear up to peak revs 21 year LR veteran > D2 GS 2003 > D3 S 2006 > D3 HSE 2009 > D4 HSE 2013 > D4 HSE 2015 > D5 HSE 2018 > DS HSE R-Dynamic P300e 2021
Last edited by DG on 7th Mar 2013 2:40 pm. Edited 1 time in total
7th Mar 2013 9:41 am
kp
Member Since: 27 May 2011
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@ 4k revs in 2nd HDC wont work as that must be near 35+mph surely?!
I'd use the brakes at that point if your picking up speed in second change to 3rd and use the brakes and engine a little and down change if needed.FFRR Owner, very nearly became a D3 owner
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7th Mar 2013 11:53 am
M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8108
He would certainly not pass the UK driving test It can when others can't,
It will when others won't,
It goes where others don't.
7th Mar 2013 12:01 pm
DaveS
Member Since: 15 Aug 2009
Location: Weybridge
Posts: 241
In any case, engine braking is not very effective with a diesel engine as there is no throttle.
7th Mar 2013 1:54 pm
crwoody
Member Since: 09 Mar 2009
Location: Littleborough
Posts: 2109
I use command shift for engine braking quite a lot with my D3 and find it fairly effective, however I wouldn't expect the system to allow it to shift down to a gear which would cause the engine RPM to exceed 4000, I think it's smart enough to provide some self protection.
I did it some years ago in a Rover 418TD manual, managed to get 2nd instead of 4th at about 60mph, wrecked the engine. Clive
Engine braking in mine in low range is very effective - but pretty useless in high.Mark.
2006, D3 SE Auto - gone but not forgotten.
2014 BMW 530d M Sport Tourer.
1977 Triumph Spitfire 1500
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7th Mar 2013 6:53 pm
blue200tdi
Member Since: 23 Sep 2012
Location: Lincoln
Posts: 1094
Over 4k revs? Changing down on command shift to slow down? Begger that on an engine and gearbox that expensive. I'll use my brakes thanks very much. OK off road with HDC on in low range, no brakes needed but on the road? These are three ton trucks not nippy hatchbacks!
Why on earth would you be doing 4000 revs going down hill anyway? You guys are gonna be busier than a test bench in a plunger factory!
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7th Mar 2013 10:24 pm
tomwu
Member Since: 13 Mar 2012
Location: Cherrybrook, NSW
Posts: 30
The reason I was asking is that I thought the transmission will shift gear up when 'red line' rev speed is reached. It's fair enough if 4000rpm is set for safety rpm.
This is my first diesel car. I used to drive a V8 Grand cherokee and perhaps it got bigger engine therefore more engine break power. On same road it's in 2nd gear and can hold the speed.
I ride motorcycle and us engine break all the time when down hill.
Seems it's time for me to change driving habits since 2.7 diesel is not powerful enough to break a 2.7 ton car.
Thank you all for the replies.
7th Mar 2013 11:55 pm
DG Site Moderator
Member Since: 12 Dec 2005
Location: The Gaff
Posts: 50934
It's not so much the size or power .. more that diesels have different characteristics to petrol engines when it comes to engine braking..something to do with compression ISTR 21 year LR veteran > D2 GS 2003 > D3 S 2006 > D3 HSE 2009 > D4 HSE 2013 > D4 HSE 2015 > D5 HSE 2018 > DS HSE R-Dynamic P300e 2021
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Changing down on command shift to slow down? 
