Cruise control problems

[downrodeo]

Hi!

Tried retrofitting cruise control kit from VW yesterday and everything is in but it doesn't work. When I run vag com I can see all the buttons being pressed, but the car will not go into cruise mode.

Secondly, prior to installing the wiring, when I held the revs at 2000rpm in neutral and pressed the brake at the same time, the ecu would cut the power and bring it down to idle speed - since I installed the wiring it no longer does this - is this normal?

Thirdly, when I check vag com it permanently has a 1 and 1 next to the f37 and f46 readings for the brake pedal in block 006. Normal? Thought it was a faulty brake switch so changed that this morning but no difference.

Finally, when I first set off after switching the engine on, it will completely cut the power for about 5 seconds shortly after moving off, and then carry on as normal.

All of this has happened since installing cruise, which in itself took me a long time. Only recently got the tdi, so suffice to say I'm bloody frustrated.

Thanks

(ps this a 110 tdi MK1 leon)

 

[downrodeo]

Sorted it anyway now. The problem was basically that the cables originally fitted to the relay box under the bonnet had come loose and the brake sensor cable had come off - so the ecu thought the brake was permanently pressed. This also meant that the cruise control would not work as brake and clutch both cancel out the cruise. It's working perfectly now. Hooray.

 

[eddy150]

Similar problem - advice please

Hi,

Im new to the cupranet forums so hello all!

Having a similar problem to the above post. Just installed the cruise control kit on my 55 Leon MK1 1.9 TDi, all went well until the test drive where...nothing.

In VAG COM 409.1 I have run 01 (engine module), then 08 (read data), read block 006, to check the cruise control has been enabled by looking for a 0.0 in the end column. When the cruise switch is turned to "on" this 0.0 changes to a 1.0 this i assume means the stalk is communicating with the ecu correctly. The only anomaly i can spot on this page is the "brake pedal (f, f37, f46)" readout box shows: "1, 0, 0" with nothing being touched (even handbrake off), when I press the brake pedal it changes to "1, 0, 1" then "1, 1, 1" when the pedal is fully pressed. I assume this readout needs to be "0, 0, 0" for the cruise to be happy to engage.

So (similar to the above post) is what i have assumed correct and if so how do i get that 1 to a 0! Sensor error? Wire out? What does the "f" correspond to?

Any thoughts and suggestions gratefully received!

 

[downrodeo]

Something is definetly wrong, because one of those switches should be for the clutch being pressed, not two for the brake pedal. And no, doesn't need to be 0.0.0. If it is 1.0.0 that is fine, it just means your cruise is switched on and communicating correctly, as you have already pointed out.

 

[eddy150]

Thanks for the speedy reply.

So I am right in thinking that the block needs to read 0,0,0 for it to engage?

The first digit may be for the clutch but there are no fault codes etc to suggest a sensor error.

Had read your post before doing the install so made double sure the wires were in properly but i guess one could have slipped.

 

[eddy150]

Sorry just re read your reply. Any other ideas what it could be?

Also no light comes on in the speedo console. It there usually one on a MK1 Leon? A friends Fabia does not have one but my mothers Gold does.

 

[eddy150]

Problem Solved

Managed to sort it...turned out it was a faulty clutch sensor/switch. I don’t think this sensor gets used for anything else so you wouldn’t know there was a problem with it until your cruise does not work.

For others having problems VAG COM can be useful to check wiring, sensors, etc when you know what the parameters in the block measure modes relate to. Here is the info, it took me a while to find it all so hopefully it will speed up others problem diagnosis (any mistakes i apologise, but hopefully it will give you somewhere to start!):

Engine - Block Measure - 006 - Go!

The three "brake pedal (f,f36,f47)" units should read 0,0,0 for the cruise to work. If any of these turns to a 1 the cruise disengages. The first is clutch sensor (faulty on mine as it constantly read 1), and second and third are from the break sensor (on mine the harder you pressed the pedal it went from 0,0,1 to 0,1,1). The % readout is the throttle. The final number is 255.0 when you activate the cruise control this changes to a 0.0, when the switch on the stalk is turned on this changes to a 1.0.

Engine - Block Measure - 022 - Go!

The important one to check wiring is the "bin" box with 6 numbers in. From memory it worked like:

000011 Cruise on/off
000100 Set
001000 Resume
010000 Brake Sensor
100000 Clutch Sensor

From this a wiring error or fallen plug could be found and fixed easily.

 

[downrodeo]

Bollocks. I just re-read my own response. What I was trying to imply there was that it was the clutch sensor as you weren't getting any feed back from it, but I didn't make myself very clear. I got confused between the box you initially mentioned and the one you're pointing out now with the 6 numbers.

 

[eddy150]

Ah ha! No worries, you pointed me in the right direction to start with. It was pretty hard work finding anything useful online, lots of good install guides but limited trouble shooting ones. Only took about 5mins of playing with switches with VAG COM plugged in to figure it out.

Cheers,

Ed

 

[downrodeo]

Ah well, enjoy your cruise Will make long journeys that little bit easier

 

[cleverspoon]

I have installed a genuine cruise kit from sere. Activated it in vag com but it wont work. Checked clutch/brake switches as per this info....all ok. Also checked cruise wirring, on off switch and buttons, all seems ok as per info on this thread, however i get 10 for cruise on/off rather than 11

It seems its communicating with car, unless im using it wrong, tried it at every speed from 30 to 70, turn it on and press set, then take foot of acelerator, iv tried holding set button, and pressing set after removing foot, all to no avail.
Iv checked the fuse snd its ok, persume stalk is getting power as the buttons communicating with vag com.

One last thing to try is deactivate it then activate it, but iv ran out of daylight.

Jack

 

[eddy150]

Hummm it's been a while since I did the install but I remember something funny about those two numbers... Got a feeling they both have to be 11 so if you are getting 10 something is not sending the right signal, the only way to be sure would be to plug in a mates car with cruise and compare numbers.

Might be worth checking the plug you have to put the pins into (to plug the kit into the loom), I remember this being tricky and thought it was where I had made a mistake.

It sounds like you are using it correctly; turn it on, get over 30mph, hit set, take foot of accelerator, cruise.

I know how frustrating these problems can be, just be methodical and check everything you have done twice. Might be worth getting in touch with the supplier of the kit.

Best of luck, let us know how you get on!

Ed

 

[cleverspoon]

Does any one know what the 11 means? Has the engine got to be on to get 11, i only had 10 with ignition wit cc on, 00 with cc off. I dont know any one else with a leon, yet alone one with cc .

If any one is able to post what numbers they get, i know the buttons are working because they flash up 1 when i press set res brake etc.
Gonna have a play when its dry, see what i find, just dont want to have to remove bloody scuttle again!

Jack

 

[Dan1720v]

not trying to be insulting, but you have slide the switch to on, on the stalk havent you?

 

[cleverspoon]

Iv tried it on, off, slid it across a load. Looking at vagcom the 11 i need on 006 measuring blocks. 00 means off, the first 1 means cc on and activated and the 2nd 1 means on. Im gonna read vagcom with engine running to see if i get 11.

In the instructions it says to activate before instalation, i installed then activated a few days later, should this affect it?

Im gonna try to deactivate it then reactivate it.

 

[cleverspoon]

Just tried de activating and reactivating cc, readings as followed:

Group 022, bin bits with cc off= 000000, with cc on = 000001
Group 006, cruise system 0 cc off = 0.0 with cc on = 1.0

For some unknown reason i cant get 11 in bin bits, just 01.


Really stumped now.

 

[eddy150]

Not meaning to state the obvious but it sounds like a dodgie connection/fault because everything else appears to be working fine (ie set, resume, etc all give "1"s so activated and ready to go in all other regards). You just need to track down what the other 0 is associated with and either fix it or short it out to give a 1.

I borrowed a friends vag com to do mine otherwise I would plug it in again!

 

[cleverspoon]

Im gonna attempt to strip it all down again and double check the plugs. Just dont fancy removing scuttle again.

Jack