Cruise Control Faulty

[AussieLandRover]

I have found out that the cruise control will not work I can hear the rely under the dash when I select the master switch but when doing over the recomended speed it will not engage. What could be the cause I have checked the fuse and it's ok.

:wallbash:

This for a 95 Discovery V8i

[cartm58]

check the engine bay for the cruise control bladder, might be a small leak or the air line running from it may have perished from engine bay heat

[AussieLandRover]

check the engine bay for the cruise control bladder, might be a small leak or the air line running from it may have perished from engine bay heat

Is that the big black vacum unit on the throttle linkage ?

[AussieLandRover]

Ok I checked the vacum lines there ok the bladder thing on the throttle linkages is ok BUT if I take the line from the T piece and the vacum line that leads under the Jack there is no vacum hold and if I blow through it you can hear something that sounds like a duck I can breath in and out with no restrictions. Is this normal or does it indicate what ever is under the jack is faulty ?

[AussieLandRover]

Can someone check with there Landy Discovery so I know if I have to get a new part or not I don't know if it is normal or not it's very easy to check.

Just look around the window washer bottle for a T peice vacum line one comes from the fire wall one goes to the bladder on the throttle linkage and this one goes along the LHF gaurd down under the Jack. Remove this from your T peice and see if you can blow or suck air freely or if it has vacum hold or restricted when blowing air.

This will tell me if mine is stuffed or not.

[nzoliver]

Aloha from NZ!
Er, the D1 CC is notorious for crapping out. 7 out of 10 times it is the hoses - just replace em all as it is cheap enough. The other times it will be the pump.:mad:
There I said it!

[AussieLandRover]

Aloha from NZ!
Er, the D1 CC is notorious for crapping out. 7 out of 10 times it is the hoses - just replace em all as it is cheap enough. The other times it will be the pump.:mad:
There I said it!

All vacum lines have been checked and are ok no leaks I can hear the relay click on so it would seem to be the vacum motor as I pulled it out from it's small cavaty under the car jack in the engine bay I pulled the plastic cover off the motor and marked the shaft with black texter went for a drive got back home looked at the motor and the mark is still alined it hasn't budged an inch so I would say it's safe to say it's the vacum motor.

[AussieLandRover]

All vacum lines have been checked and are ok no leaks I can hear the relay click on so it would seem to be the vacum motor as I pulled it out from it's small cavaty under the car jack in the engine bay I pulled the plastic cover off the motor and marked the shaft with black texter went for a drive got back home looked at the motor and the mark is still alined it hasn't budged an inch so I would say it's safe to say it's the vacum motor.

Ok turns out after replacing the vacum motor that was not at fault same result.

So would I be looking at the control box or the steering wheel ? I think this is were the fault now is. How do I get the steering wheel off without setting the airbag off.:eek:

[AussieLandRover]

Ok I got around to replacing the CC computer and still no go so what should I be looking at now ?

[HAK]

check the engine bay for the cruise control bladder, might be a small leak or the air line running from it may have perished from engine bay heat

I agree, I had the same problem I thought bugger crusie controll to expensive to fix. Any way I had a look at the bladder a few weeks ago it looked ok took the vacume hose off cleared it with water put it back sucked on the hose for a bit to see if the bladder was working all good then wallah it worked again

[AussieLandRover]

I agree, I had the same problem I thought bugger crusie controll to expensive to fix. Any way I had a look at the bladder a few weeks ago it looked ok took the vacume hose off cleared it with water put it back sucked on the hose for a bit to see if the bladder was working all good then wallah it worked again

This is no longer the issue all this has been replaced so something else is the cause but what ?

[duncanw]

If you have replaced the lines, pump and CC ECU and if you can hear a click when you press the switch that means the switch on the steering wheel isn't faulty.

Disconnect the line at the T piece and see if the line going into the cabin holds pressure, if not then it might be the cutoff switch under the brake pedal.

You will find there are two switches under the brake pedal, one is for the brake lights and the other is for the CC. pull both of the plungers out a few notches and see if that fixes it.

[AussieLandRover]

If you have replaced the lines, pump and CC ECU and if you can hear a click when you press the switch that means the switch on the steering wheel isn't faulty.

Disconnect the line at the T piece and see if the line going into the cabin holds pressure, if not then it might be the cutoff switch under the brake pedal.

You will find there are two switches under the brake pedal, one is for the brake lights and the other is for the CC. pull both of the plungers out a few notches and see if that fixes it.

Ok steering wheel switch go click.
Line going into the cabin when I blow or suck there is no hold.

How do you remove the cutoff switch on the brake pedal ?

[duncanw]

You don't need to remove the switches behind the pedal, just press down on the brake pedal with one hand and pull the plunger out a couple of notches, the plunger is on a rachet.

When you release the pedal you will here a couple of clicks as it resets itself.

[DiscoveringAuz]

I had this issue 3 or 4 years back, brake switch was the problem, from memory the lip on the plungr had broken, i glued a washer on, with no problem since, i'll have a look tomorrow and post a pic if u need

[willvine]

Check your brake lights. If any globes are out then the cruise control may not work. I was told this after I had problems with mine. good luck.

[AussieLandRover]

Check your brake lights. If any globes are out then the cruise control may not work. I was told this after I had problems with mine. good luck.

Brake lights are all working they get checked every weekend.:BigThumb:

[AussieLandRover]

You don't need to remove the switches behind the pedal, just press down on the brake pedal with one hand and pull the plunger out a couple of notches, the plunger is on a rachet.

When you release the pedal you will here a couple of clicks as it resets itself.

Even if this does not fix it how do I remove this switch. :confused:

[DiscoveringAuz]

Attached is the instructions, with mine the plunger top was broken so always releasing the vac

[AussieLandRover]

Thanks mate that helped allot.

[AussieLandRover]

Good News I Have Cruise Control :burnrubber:

Did as mentioned pushed down the brake pedel and pulled the plunger out as far as it would go then released the brake pedel and heard only 2 or 3 clicks then checked the vacum from the engine bay to the cut-off switch and there was vacum. Took her on a drive and she engaged.

:ehigh5::banana::twobeers::clap2::BigThumb:

Thanks for all your help guys and this thread should now help others in the future.

[Shaker]

While you are all in Cruise Control mode, mine all works OK except it won't 'Resume' ....... any ideas?

[AussieLandRover]

While you are all in Cruise Control mode, mine all works OK except it won't 'Resume' ....... any ideas?

Won't resume as in ? you over take higher the the cruise set but after over take the cruise won't continue at your set speed it just goes to 0k's ? is this what you mean ?

[Shaker]

Won't resume as in ? you over take higher the the cruise set but after over take the cruise won't continue at your set speed it just goes to 0k's ? is this what you mean ?


What I mean is, if I am in cruise control mode & say, touch the brakes to slow down, if I hit the "resume" button nothing happens, I would have thought that it should reactivate the cruise control, accelerate to & then maintain the preset speed.

[AussieLandRover]

Well mine does not have a resume option button but I would think in your case it just might be the cruise control computer ?

[nzoliver]

Hi,
Are you aware the cruise won't operate unless you are doing more than 60km/h?

[AussieLandRover]

Hi,
Are you aware the cruise won't operate unless you are doing more than 60km/h?

Mine will engage at 45km/h ;)

[duncanw]

What I mean is, if I am in cruise control mode & say, touch the brakes to slow down, if I hit the "resume" button nothing happens, I would have thought that it should reactivate the cruise control, accelerate to & then maintain the preset speed.

it may be some wierd logic, I'll try this out on my way to work tommorow, I've only tried the resume when I'm on cruise mode, hit the res to cancel the cruise and then when I've got past the idiot doing 80km/h I hit res again and it takes me back upto cruising speed.

[AussieLandRover]

Ok it was short lived with my cruise control on the weekend on the way home from Ballarat my cruise control went eradic on me going on off all the time or once now and again but I have noticed it was in conjuction with my speedo doing the same as the needle on my speedo was eradic as well jumping up and down.

Could the speedo sensor on the transfer case be faulty ?

[4bee]

Yes, as it relies on a signal from the VSS. Probably find it's fallen apart at the seam which appears to be a common problem. Sometimes repairable after a good internal cleaning. If not replace it. Bit of a bugger of a thing to get at as some clown put a brake drum in the way.

[simonl8353]

Thanks guys for this thread.

My D2 Cruise Control failed a couple of weeks ago and before reading this thread I had no ideas.

Anyway, all fixed for $1.50 for a 10" piece cut off a roll at Supercrap on Saturday. :BigThumb:

Pity your issue wasnt so simple, best of luck with it

[nzoliver]

:cool:Hmm
D2s seem to only have hose issues. I haven't come accross any other fault the them. Yet.

[roverv8]

Well, ive read this thread from front to back and done the vac lines, brake switch, bladder on the throttle linkage, can here it clicking behind glovebox on & off.
the vacum pump was not working, so i removed it and tested it on a battery and away it went.
Used a test light on the wiring to the vacum pump and there is no power coming through even with the main C/Control switch on, fuse is fine.

Any more tips??:confused:

Thanks Luke

[Lucus]

you wont see power at the vacum pump until certain conditions are met.

Cruise master on
Brake switch off
Signal from VSS indicating road speed higher the 45kph.

Rave has a detail electrical test procedure:), i would start with new relays tho

[roverv8]

you wont see power at the vacum pump until certain conditions are met.

Cruise master on
Brake switch off
Signal from VSS indicating road speed higher the 45kph.

Rave has a detail electrical test procedure:), i would start with new relays tho

I hooked it all back up and went for a drive with no go.
Where do i find this elec procedure??

[Pierre]

RAVE 1 - electrical troubleshooting manual, cruise control.

Get RAVE from the shop on this website - Dave's Interesting Things.

Cheers

Pete

[roverv8]

RAVE 1 - electrical troubleshooting manual, cruise control.

Get RAVE from the shop on this website - Dave's Interesting Things.

Cheers

Pete

Thanks, on Order
Luke

[blackbuttdisco]

Just been to Perth and back, did over 12000km. Halfway there I finally found the fault with my cruise control. There is a relay which supplies power to the vent valve on the brake pedal assembly. The wires were broken on the switch. Has now worked ever since.
Heater hose rubbed against engine but fixed that before disaster struck. Also had a wobble at the front wheels. Found an oil leak on the drivers side and the 6 bolts that hold swivel ball onto the axle were loose and that is where the oil was coming from. Tightened up the bolts and checked diff oil. Now ok. Also ran on LPG all the way from Brisbane to Perth. Came back a different way and had to run on petrol a few times.