C4 B78 2.0Blue Hdi -- Clutch Pedal position reset ?

[onthecut]

After my adventure with the slave cylinder supply line popping out, I find I'm still in bother. Pipe and fittings all sorted and clutch bled. However -- it now won't start.

Diagbox says clutch pedal position error. Bit confuse by this, as I had no such issue when I replaced the clutch itself. Is it a Diagbox job to tell it to get used to a new position, or am I likely to have discombobulated something in the bleeding process. Is it a switch above the pedal, or integral with the master cyl ?

Any thoughts most welcome.

Mike.

[RichardW]

Believe it is a sensor integrated into the master cylinder. You may have knocked the connection, or got fluid in it, or it's beggared from the bleeding op. If you can get it on Diagbox you should be able to see where the position, and whether it makes sense. No idea if there is an option to re-initialise.

[onthecut]

Hi Richard.

Thanks for your response. Yes -- it's integral with the master cyl. Looking online, I came across this on the Valeo webnsite --

'The new generation of clutch master cylinder with a sensor is commonly used on applications equipped with electronic hand brake, cruise control, or start & stop functions.
A sensor with reduced dimensions (down to 15mm) is attached to the CMC body and the piston contains a magnet.
The magnetic field enables the sensor to detect the linear position of the piston and thus identify the pedal position.
This new technology applies to the new Peugeot 308, Fiat Ducato, Opel Corsa, Nissan Qashqai, and Renault Clio.'

As there is (presumably) no direct physical interaction between the piston and sensor and I haven't been anywhere near the master cyl. itself to affect its magentism, I can't see any logical reason for the pick up to have failed simply due to the pumping motion of bleeding. I have since seen one or two postings online about this fault, following the car being started in gear after clutch control failure, just as mine was. Looks like another plug in session awaits.

Mike.

[RichardW]

Ah, perhaps it has detected an inconsistency between reported pedal position, and then that the car moved, or it detected input shaft rotation, when cranked, which fails the logic test, and it then sets a permanent code to avoid starting it in gear. Can you delete the fault? Otherwise some sort of re-set may be required - replacement of the master cylinder procedure perhaps?

[onthecut]

Well -- I think I have a result, but I don't necessarily think I've got there in the right fashion. Lookiing at posts from other makes, it became pretty evident that a 'learning' process has to be completed. It may be that my Diagbox version (7.62) is just too early, but I couldn't find any reference to clutch master cylinder replacement or pedal position learning. In the end and with nothing to lose by trying, I hit the 'replacement clutch' option and hey presto, it's starting again. Initially a gap of a few seconds betwen hitting the button and the starter turning, but having been around the block in it, it now seems back to normal.
Slightly disconcertingly, the pedal error fault code is still present and reappaers immediately if cleared. As I don't use the stop start I'm quite happy to live with the error code as long the thing actually functions.
Have to say that I find this degree of complication just in starting absolutely crackers. It's funny how we all got by fine by putting a key in and turning it !

Mike.

[Munki1711]

Hey Mike,
Sorry to resurrect an old thread but I'm struggling. My clutch went a few weeks ago so I had the rac out,they towed me home and the recovery guy had to start it in gear to drive into parking spot,it was the clutch slave that was faulty so I had this replaced,then I had faults coming up,rac back out and said it was the clutch sensor on master cylinder so I had that done,faults are still there and include,check engine,handbrake and cruise controll won't work neither will stop start,I also have to hold the ignition button in for a couple of seconds to start!!
I think I need to tell the car that it's been replaced but I'm struggling,any help?
Cheers in advance,

Mike.

[RichardW]

You need a decent scan tool that can read live data to see what's going on.

[maciejwrc]

I have the same problem. The mastr clutch cylinder with sensor has been replaced and the error still occurs. Can anyone help me?

[Lee1970]

Well -- I think I have a result, but I don't necessarily think I've got there in the right fashion. Lookiing at posts from other makes, it became pretty evident that a 'learning' process has to be completed. It may be that my Diagbox version (7.62) is just too early, but I couldn't find any reference to clutch master cylinder replacement or pedal position learning. In the end and with nothing to lose by trying, I hit the 'replacement clutch' option and hey presto, it's starting again. Initially a gap of a few seconds betwen hitting the button and the starter turning, but having been around the block in it, it now seems back to normal.
Slightly disconcertingly, the pedal error fault code is still present and reappaers immediately if cleared. As I don't use the stop start I'm quite happy to live with the error code as long the thing actually functions.
Have to say that I find this degree of complication just in starting absolutely crackers. It's funny how we all got by fine by putting a key in and turning it !

Mike.

Did you ever get this sorted?

[Lee1970]

Did anyone here get to the bottom of the problem?

Thanks
Lee