Cruise Control Not Working

courier118 · 4th January 2012, 11:12

Cruise control stopped working after 9 years.The master switch lights up,when you press the set + button on the steering wheel,the yellow symbol on the dash lights up but the cruise does not work.The Res button also works,when pressed it switches on and off the yellow symbol on the dash,obviously after the set + button has been pressed.
When the clutch and brake pedal is used the cruise deactivates (yellow symbol goes off)
Ive checked both switches on the clutch and brake pedals,all in position and the above would not happen if these were not in place?
The actuator arm that connects to the throttle body linkage is connected and so is the vacuum pipe that connects to the actuator at the bottom of the bulkhead on the o/s.All the system,electrically as in switches and lights is working correctly as it always has done,but it will not activate the cruise itself.
Anyone had similar problems?

David3807 · 4th January 2012, 12:00

Check the Vacuum pipe for a small leak somewhere. Then get cycle puncture repair kit to make good.

courier118 · 4th January 2012, 12:44

Checked vacuum pipe between the 2 actuators,all fine,no leaks

Lates · 4th January 2012, 13:54

Check the pedal switches have not become dislodged, especially clutch pedal; switch

edit,
muppet should read properly before replying. Use a vac gauge on the diaphragm to see if it can hold a vac.

courier118 · 4th January 2012, 14:20

Vac Guage..........****** hell mate im just a poor HGV Driver...lol

Ive just unplugged the vacuum pipe from the diaphragm and pushed it in manually and held my finger over the outlet pipe and the diaphragm does not lose any air and stays compressed until i release my finger

courier118 · 27th January 2012, 12:21

Update

Just for reference purposes,the problem has been sorted
The problem was in the vacuum control pump.I took it off the car and prised off the top lid which is just a push fit.Inside is a little motor with a cam wheel device that operates a little diaphragm and a couple of electrical windings.The upper winding which has 2 wires soldered to it had one of these soldered joints broken off,so a quick resolder job,refit to car,take for a run,has cruise control all working again.
So just incase anyone else has similar problems then this may be something to look at

Lates · 27th January 2012, 18:19

Top work, well diagnosed that man.

crofts · 28th January 2012, 02:22

Quote:

Originally Posted by Lates

Top work, well diagnosed that man.

One for the memory Lates. Bet most garages would have fitted a new unit !

courier118 · 28th January 2012, 09:28

At a cost of £241 for a new vacuum control unit its a no brainer

Lates · 28th January 2012, 10:47

It's quite common place unfortunately, garages don't repair things nowadays. time and workshop loading don't always allow for open ended diagnostics.

4th January 2012, 11:12	#1
courier118 Loves to post MG ZT 190+ Join Date: Nov 2006 Location: Newcastle under Lyme Posts: 305 Thanks: 0 Thanked 0 Times in 0 Posts	Cruise Control Not Working Cruise control stopped working after 9 years.The master switch lights up,when you press the set + button on the steering wheel,the yellow symbol on the dash lights up but the cruise does not work.The Res button also works,when pressed it switches on and off the yellow symbol on the dash,obviously after the set + button has been pressed. When the clutch and brake pedal is used the cruise deactivates (yellow symbol goes off) Ive checked both switches on the clutch and brake pedals,all in position and the above would not happen if these were not in place? The actuator arm that connects to the throttle body linkage is connected and so is the vacuum pipe that connects to the actuator at the bottom of the bulkhead on the o/s.All the system,electrically as in switches and lights is working correctly as it always has done,but it will not activate the cruise itself. Anyone had similar problems?

4th January 2012, 12:00	#2
David3807 Posted a thing or two 2002 R75 Conn SE 2.5l Auto Tourer, 2001 R75 Conn SE 2.5 Auto Saloon Join Date: Nov 2006 Location: Gravesend Posts: 1,897 Thanks: 0 Thanked 2 Times in 2 Posts	Check the Vacuum pipe for a small leak somewhere. Then get cycle puncture repair kit to make good.

4th January 2012, 12:44	#3
courier118 Loves to post MG ZT 190+ Join Date: Nov 2006 Location: Newcastle under Lyme Posts: 305 Thanks: 0 Thanked 0 Times in 0 Posts	Checked vacuum pipe between the 2 actuators,all fine,no leaks

4th January 2012, 13:54	#4
Lates This is my second home Jaguar XE Join Date: Nov 2006 Location: Coventry Posts: 4,321 Thanks: 56 Thanked 59 Times in 55 Posts	Check the pedal switches have not become dislodged, especially clutch pedal; switch edit, muppet should read properly before replying. Use a vac gauge on the diaphragm to see if it can hold a vac.

4th January 2012, 14:20	#5
courier118 Loves to post MG ZT 190+ Join Date: Nov 2006 Location: Newcastle under Lyme Posts: 305 Thanks: 0 Thanked 0 Times in 0 Posts	Vac Guage..........****** hell mate im just a poor HGV Driver...lol Ive just unplugged the vacuum pipe from the diaphragm and pushed it in manually and held my finger over the outlet pipe and the diaphragm does not lose any air and stays compressed until i release my finger

27th January 2012, 12:21	#6
courier118 Loves to post MG ZT 190+ Join Date: Nov 2006 Location: Newcastle under Lyme Posts: 305 Thanks: 0 Thanked 0 Times in 0 Posts	Update Just for reference purposes,the problem has been sorted The problem was in the vacuum control pump.I took it off the car and prised off the top lid which is just a push fit.Inside is a little motor with a cam wheel device that operates a little diaphragm and a couple of electrical windings.The upper winding which has 2 wires soldered to it had one of these soldered joints broken off,so a quick resolder job,refit to car,take for a run,has cruise control all working again. So just incase anyone else has similar problems then this may be something to look at

27th January 2012, 18:19	#7
Lates This is my second home Jaguar XE Join Date: Nov 2006 Location: Coventry Posts: 4,321 Thanks: 56 Thanked 59 Times in 55 Posts	Top work, well diagnosed that man.

28th January 2012, 09:28	#9
courier118 Loves to post MG ZT 190+ Join Date: Nov 2006 Location: Newcastle under Lyme Posts: 305 Thanks: 0 Thanked 0 Times in 0 Posts	At a cost of £241 for a new vacuum control unit its a no brainer

28th January 2012, 10:47	#10
Lates This is my second home Jaguar XE Join Date: Nov 2006 Location: Coventry Posts: 4,321 Thanks: 56 Thanked 59 Times in 55 Posts	It's quite common place unfortunately, garages don't repair things nowadays. time and workshop loading don't always allow for open ended diagnostics.