what vacum hose goes to the cruise control...

[tradin1]

it is not hooked up at all. when i push the button on the dash it doesnt illuminate, would that be because the hose is disconected? if not what fuse should i check? does anyone have a list of what fuses are what on a 95 D1, i didnt get the owners manual.

thx

 

[alex3324]

Vacuum hose goes from the vacuum pump in the recess under the jack, up, along the wheel well, passes through a T -- one part of the tee continues through the firewall to the brake pedal switch (this releases the vacuum on the servo when pressing the brake pedal, thus cancelling cruise control). The other part of the tee goes to the vacuum servo near the throttle body.

I'm only guessing here, but a loose vacuum hose won't make your CC light not illuminate. There's a couple of relays, the vacuum pump and the CC ECU to check.

This is a very common problem with D1s, maybe D2s, too. Almost all I have seen have CC problems with the cracked/broken vacuum hoses.

 

[apg]

Cruise

...tell me about it. The cruise control on my '96 is iffy. Vacuum lines are fine (first thing I checked) but it's sometimes-there- sometimes-not, even with the switch illuminated. Even then, I have to 'massage' the switch to make the light come on. I've had to replace three other switches (rear window heater, rear wiper, and the A/C switch) that simply quit. All are non-serviceable (I've tried....) Fortunately, the cruise switch is easy to replace. I had to pull the entire dash apart to get to the backside of the A/C switch. What a PITA.....

Cheers

 

[Chris-St Louis]

A brief Explaination of how Cruise works on a Rover.

Electronic Control Unit (ECU)
The microprocessor based ECU evaluates the signals provided by the driver controls, brake pedal switch, clutch pedal switch on manual models, and the vehicle speed sensor. The ECU activates the vacuum pump as required. The ECU also has a memory function for set Speed storage.

Driver Operated Switches
The main cruise control switch is located in the auxiliary switch panel and activates the cruise control system. The steering wheel switches provide 'set/accelerate' and 'resume/decelerate' features. These switches provide the interface between driver and cruise control system.

Brake Pedal Switch
The brake pedal switch is located under the lower dash attached to the brake pedal mounting bracket. The switch provides for fast disengagement of the cruise control system and rapid return of the throttle levers to the idle position when the brake pedal is applied.

Clutch Pedal Switch
The clutch pedal switch is located under the lower dash attached to the clutch pedal mounting bracket. The switch provides for fast disengagement of the cruise control system and rapid return of the throttle levers to the idle position when the clutch pedal is applied.

Vehicle Speed Sensor
The vehicle speed sensor is located on the side of the transfer box adjacent to park brake. The sensor provides road speed data to the ECU. The cruise control system cannot be engaged until the road speed exceeds 45 km/h, (28 mph) the system will automatically disengage at a road speed of 42 km/h (26 mph).

Vacuum Pump
The vacuum pump is energized when the main cruise control switch is operated, and is actuated by the steering wheel and brake pedal switches. The pump provides a vacuum source to the cruise control actuator. A control valve in the pump provides for steady increase of road speed or purge of the system when the brake pedal is applied.

Actuator
The actuator provides the servo mechanism link between the cruise control system and throttle linkage and is operated by vacuum from the vacuum pump.

Neutral Lockout Relay - Automatic Vehicles
The relay module is located in the right hand side footwell, accessible by removing the trim casing.

The function of the relay module is to disengage the cruise control System if neutral, or park, is selected in the main gearbox, when the system is engaged.

Engine Speed Trip ECU - Manual Vehicles
This unit is located in the right hand side footwell, accessible by removing the trim casing.

The function of the unit is to disengage cruise control if engine speed exceeds 5000 rev/min.

 

[Chris-St Louis]

Here is a TSB Rover put out about Cruise Control.

A small number of vehicles within the above VIN range suffer an "Air leak" on the cruise control actuator between the actuator body and the rubber diaphragm. During "set" of the cruise control, if the actuator has an air leak, the time taken to "set/hold" the cruise speed, will be increased. In certain cases the leak may be too large, and the actuator (cruise control) will not function correctly.

ACTION REQUIRED

Upon customer complaint of a cruise control "set/hold" inoperative and a longer than normal time to achieve "set/hold", carry out the checks detailed below.

PARTS INFORMATION

ETC7150 - Cruise control actuator (Qty. 1)

PROCEDURE

Refer to the Workshop Manual section 19 Actuator

Procedure for checking the cruise control actuator.

1. Open the hood and locate the cruise control actuator unit.








2. Remove the vacuum hose from the base of the actuator "A" (see illustration).

3. Compress the diaphragm by approximately 0.1969 -0.3937 in. (5-10 mm), place finger firmly over the pipe on the actuator body to achieve a seal.

NOTE: If the diaphragm is compressed completely the actuator may not show signs of a leak.

4. Release the diaphragm, with the hose sealed the diaphragm should remain in its depressed condition.

5. If the diaphragm returns to its normal shape repeat the test once more to confirm result.

6. If a leak is confirmed, replace the actuator.

 

[dougo]

Cruise Control issues

Hi all,
I've see all you disco owners out there with Cruise Control problems and Yes I was too hit with no cruise control
I checked the lines, Cruse control switches on the peddles etc, Checked the diaphragm on the throttle body etc. still no go.
I then pulled out the vacuum unit and hooked it to the battery. Plenty of suction.
Still couldn't work it out. Started getting prices on a replacement pump $80-$250AUD and then I decided to take a 2nd look at the pump.
This time I pulled it apart and found the solenoid that closes when the pump runs was frozen. So I ended up using some WD40/RP7 spray and hey presto, the little solenoid was cleaned up and since then my cruise control has worked.

The local LR dealer said the pump unit was unserviceable, What a load of crap!

Just something else to look at if you have issues.

Cheers

 

[peter sherman]

Go to the brake pedal switch. There are two of them one is for the shift selinoid the other is for the brake & cruise.[top switch] There is a little sleeve that slides over the switch. Pull that slide out. If that is not out far enough the cruise will be dissabled. Also your dash switch will not work .

 

[dave77]

Fuse #18 (in box below steering wheel) feeds the cruise. Try turning on the key but don't start the engine, then press the on/off switch. You should be able to hear the cruise relay click under the glovebox if power is OK.

 

[Apexdisco]

I have no cruise control either.


Does anyone have a picture of where the hoses are and the vacuum pump? Or just point them out to me?

Thanks.

 

[alex3324]

I have no cruise control either.


Does anyone have a picture of where the hoses are and the vacuum pump? Or just point them out to me?

Thanks.

see the second post in the thread, it tells you pretty clearly which hoses go where.

 

[Apexdisco]

see the second post in the thread, it tells you pretty clearly which hoses go where.

Thanks.

 

[jcarr01]

I realize that this is an old topic, but I am still trying to fix the #$@% cruse control on my 98 disco. I must thank everyone who has already submitted to this topic. Afrer checking most everything listed in thes post, hoses, diphram, vacume pump ( which was plumbed backwards) where is the silly cruse control relay? I could only find two relays on the main fuse panel, the turn signal and I believe the iginition. Any Help would be appericated.

Thanks!!!!!!!!!!!!!!!

 

[ptschram]

where is the silly cruse control relay?
Thanks!!!!!!!!!!!!!!!

The cruise control relay is beneath the glove box, behind/above the silly pieces of cardboard. The one you're looking for is the only black one, it is a super-special relay with different pins than the rest in the truck. not really sure what's so special because it sure as Hell can't handle the current going through them.

PT

 

[JLS]

Hey PT, so if this relay, behind glove box, is bad will CC work at all. My CC is very odd. Some days it will work flawlessly for an entire trip to work, 1hr @ 75. Some days it will engage and 2 mins later it's like you shut it off. When this happens sometimes you can just speed back up and hit the set button and it works again. Other times you have to actually hit the CC enable/disable switch for it to set again. Other times it doesn't work at all. With that said, I have not checked the diaphram, I will do that but if it sometiems works flawlessly for an entire trip, thats the part that puzzles me. Also, my horn does not work. Found this out when some jack ass cut me off. I rarly get mad on the road so I don't know if this happend the same time the cc started going haywire. I think it's the spiral cassette inside the steering wheel, does that have anything to do with BOTH the horn and CC? I checked fuses for the horn and to see if the horns were still connected, fuse is good and horns still connected.

TIA,
Jeremy

 

[jcarr01]

PT,

Thanks, I cycled the master switch a few time and did not hear the relay cycle, So I guess it will be time to make sure that there really is voltage to the relay. Just want to make sure that I have the correct relay, it is a Siemens, with the following ID : V23134-J57-X254 AMR3773.

 

[jcarr01]

PT,
Thanks for you help, The relay was fine, found a broken lead for the relay, fixed that and now I have cruse control!

Jim:victory:

 

[Tims95Disco]

I'm done messing around with trying to fix my cruise control.:banghead: Although I'd really like to have one.

Has anyone tried an after market cruise?

 

[kf6kmx]

This is a very common problem with D1s, maybe D2s, too. Almost all I have seen have CC problems with the cracked/broken vacuum hoses.

Appears to be common on the DII also.. ALL 3 DII's I looked at (including the 2000 I bought) had the cracked vacuum line.. its an easy fix, but very common.

 

[jcarr01]

Darn, it looks like I may have started celebrating just a little too soon, that cruse control stopped working on the drive home. But the good news is that the local Independant Rover / Jag repair shop showed me in the book, that the relay in question has a part number AMR3773 and that it is the ABS relay, which apperently is a problimatic piece of electronics. Their suggestion was to check the brake switches, that it was one of their most common cruse control problems. I hope that help everyone else out.

Jim

 

[jcarr01]

Could some one please help me id a part number for the electrical/vacume brake switch whic interacts with the cruse control. I can tell you that it is the switch that the vacume line for the bellow and the vacume pump connect to in side the passange compartment and that when the brake pedal is pushed the switch opens both electrically and vacume, dumping the vacume ont he throtle and kicking the cruse control off. it is the lower of the two switches. much thanks