Di2 Ultegra protection function

[tony cheyne]

I hit a pot hole on the road yesterday that set off the protection function and dis-engaged the motor on the rear derailleur. I have followed the procedure to reconnect in the Di2 factory owners manual to the letter with no success. I have manually moved the derailleur up, down, left and right, but still no engagement. Occasionally it will shift one or two gears when re-trying the reset process with the red light on, but after the one move, it moves no more. Does any one have a similar experience, does any one know what I have to do to fix it?
p.s. I was at the end of a 2.5 hour ride around the local hills, just up the hill from home, thank goodness. I thanked the stars this incident did not occur earlier in the ride where I still had to negotiate 20 or so climbs to get back home with no rear gear changing. I have used Campagnolo for the last 15 years so it was a big step to move to Shimano.
I am disappointed that this system does not come with a quicker and simpler way of being fixed. There doesn't seem much point in having an innovation such as Di2 if the risk of not being able to use it after a bump on the road is such a strong likelihood. Please excuse my negativity here, but remember, I only hit a bump on the road, I did not crash. Previously I would have needed to have torn the rear derailleur off the frame to have had a similar result. i.e. walking home, or hitching a ride.

 

[dsut4392]

Are you sure you have triggered the crash protection 'feature'? Sounds more like a loose wire, both in terms of the symptoms and the cause...

A couple of threads about this 'feature' on other forums:

http://forums.roadbikereview.com/components-wrenching/ultegra-di2-crash-saver-285101-2.html

http://weightweenies.starbike.com/forum/viewtopic.php?f=3&t=64877&start=45

 

[Dundee]

Agree with dsut4392, more than likley a loose connection probably at the STI. They can look connected but they can have a poor connection. Unplug at STI and refit. Hopefully that shoud solve your problem.

 

[Bustedknuckle]

I hit a pot hole on the road yesterday that set off the protection function and dis-engaged the motor on the rear derailleur. I have followed the procedure to reconnect in the Di2 factory owners manual to the letter with no success. I have manually moved the derailleur up, down, left and right, but still no engagement. Occasionally it will shift one or two gears when re-trying the reset process with the red light on, but after the one move, it moves no more. Does any one have a similar experience, does any one know what I have to do to fix it?
p.s. I was at the end of a 2.5 hour ride around the local hills, just up the hill from home, thank goodness. I thanked the stars this incident did not occur earlier in the ride where I still had to negotiate 20 or so climbs to get back home with no rear gear changing. I have used Campagnolo for the last 15 years so it was a big step to move to Shimano.
I am disappointed that this system does not come with a quicker and simpler way of being fixed. There doesn't seem much point in having an innovation such as Di2 if the risk of not being able to use it after a bump on the road is such a strong likelihood. Please excuse my negativity here, but remember, I only hit a bump on the road, I did not crash. Previously I would have needed to have torn the rear derailleur off the frame to have had a similar result. i.e. walking home, or hitching a ride.

I would first check all your connections. Sounds like one isn't secure.

Do you have the evaluation software from shimano? Can you/have you connected the group to a laptop via the hole in the interface unit?

 

[tony cheyne]

Found it! Thanks for your imput guys. You make a great team. It was in the change lever connection after all. Phew!!! I had already checked that but what looked and felt good, was not in fact a hard connection. The cable required a much harder push to solidly connect to the fitting.

 

[Bustedknuckle]

Found it! Thanks for your imput guys. You make a great team. It was in the change lever connection after all. Phew!!! I had already checked that but what looked and felt good, was not in fact a hard connection. The cable required a much harder push to solidly connect to the fitting.

Huzza!! Yep, the connectors are the 'weak link' with these.