Bosch active - no power

cusdae

Finding my (electric) wheels
Jul 7, 2017
8
1
66
nottingham
My Scott E-Sub Tour has developed a fault by which there is no assistance given, and no speed showing on the Intuvia display.
I think the Intuvia is attached properly. The Up/Down buttons on the separate controller work, and I can seemingly select all assistance modes from off to turbo, on the display. But there is no assistance when pedalling, and nothing (not even zero) showing where the speed should be. The unit switches off after 2 minutes.

I have cleaned the exterior contacts on bike and Intuvia. I have checked the magnet is properly aligned with the speed sensor. The battery is showing fully charged on its own display.

What can I try next? Is there a definitive test for whether the battery is properly attached and supplying power?
 
Last edited:

soundwave

Esteemed Pedelecer
May 23, 2015
12,603
5,179
you need to remove the left side motor cover to get the the connectors for the speed sensor and clean and re connect it and see if that works.

if not then you could try a new sensor or take it to a dealer if that still does not work
 

Gubbins

Esteemed Pedelecer
I have had similar issues in the past which were the head unit not making contact due to it not being pushed fully into the cradle. I have also had a battery error and s misaligned magnet and both showed as errors on the display whereas the head unit not making contact didn't show an error
 
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cusdae

Finding my (electric) wheels
Jul 7, 2017
8
1
66
nottingham
Thanks for the responses. This morning the bike was fine. When I switched on the Intuvia, the words Bosch Active appeared, and the speed of 0. I went for a short ride using all assist levels, switched off the unit (without removing it). Then switched back on, and it failed to initialise. However pressing the battery button briefly, brought the correct display back again. This seems replicable. If the first switch on fails (though it never has done that before) then a battery press provides a workaround.
I have seen no error messages (but then I'm not sure where to look for these).
 

Headshok

Pedelecer
Feb 19, 2018
73
4
51
Swindon
There are 3 issues that affect the sensor/ magnet

1 the gap 17mm max but 7to 9 MM. Is best
2 the magnet can go weak
3 the sensor wire might be damaged, ave routed mine internally with the brake hose.
 

cusdae

Finding my (electric) wheels
Jul 7, 2017
8
1
66
nottingham
I've ruled out the sensor as a cause of the problem. Because I can get it to reset itself by pressing on the battery, I think it must be something in the control unit. My theory is that in normal operation, switching on the controller wakes up the battery pack, which is then reflected by the speed appearing in the display. But this is not happening with mine. It is as if the controller is not mounted on the bike.
So the next likely cause is a poor connection in the controller/bike mount. But because a press on the battery is enough to 'cure' the problem, I don't think it is simply a loose connection.
 

Wander

Esteemed Pedelecer
Aug 8, 2013
584
429
Have you tried recharging the battery in the Intuvia head unit?
 

cusdae

Finding my (electric) wheels
Jul 7, 2017
8
1
66
nottingham
I don't know how to do that? The battery symbol in the display shows maximum bars, so I guess it recharges when in use?
 

Wander

Esteemed Pedelecer
Aug 8, 2013
584
429
Take the Intuvia off the bike and charge it via the mini / micro usb port under the little rubber flap. A phone charger or lead you plug into a computer normally does the trick.

The other thing to check again based on the symptoms described is the magnet alignment per Artstu's post. Note that it aligns with the line on the sensor, not the round bit.
 

Transistor

Finding my (electric) wheels
Jun 2, 2012
6
2
Guys, the OP is clear that the display was working but there was no '0' in the speed display. This has nothing to do with the wheel sensor as this is open circuit except when the magnet is in proximity. The computer has no way of knowing whether or not the sensor is there unless it detects multiple pedal rotations with no pulses from the wheel.

I had the same problem this morning and resolved it by jiggling the Intuvia display on its bracket. (Mine has the security screw in place and hasn't ever been off the bike.) It's strange.
 

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