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ST3: engine stopped working all of a sudden
#1
Hello and apologies for writing in English,

I have a Stromer ST3 with 1600KMs. Today I turned it on, and all of the sudden the engine doesn't work anymore. I pedal and get no power from the bike whatsoever.

I tried to remove the battery (100% charged) to no avail. I tried to calibrate the pedals sensor and I get now this error message: W270100

If I don't try to calibrate the sensors I don't get any error message, but the engine simply doesn't do anything.

Can somebody help?

Many thanks in advance
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#2
(16.09.2021, 17:00)funkyhog schrieb: I have a Stromer ST3 with 1600KMs. Today I turned it on, and all of the sudden the engine doesn't work anymore. I pedal and get no power from the bike whatsoever. I tried to remove the battery (100% charged) to no avail. I tried to calibrate the pedals sensor and I get now this error message: W270100

If I don't try to calibrate the sensors I don't get any error message, but the engine simply doesn't do anything.

Hello funkyhog

The error W270100 is displayed when the sensor voltage drops below the threshold value of 0.5V. 

1.) Check the tightening torque of the rear axle (20 Nm, ST3 Mod. 2021 or 25 Nm, 2018-2020) as well as the torque of the three sensor plate screws (10 Nm). The 'voltage' of the sensor in the OMNI service menu must be in the range 0.5 - 1.5 Volts. 

2.) Check the plug connection of the sensor in the rear right chain stay as well as the wiring up to the OMNI and its plug connection (TMM).

If everything is ok at 1.) and 2.) the problem can also be at the sensor itself or in the worst case at the OMNI.

   

Good luck!
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#3
Hi, thanks for your help.

I checked the tightening torque of the 3 screws on the sensor plate and they were about right at 10nm.

The torque of the rear axle was a little below 25nm, and I have now increased it to 25nm.

I also checked on the service menu and the voltage fluctuates between 0.08 and 0.1 volts. There is also an offset of 0.831v. The issue is that if I hit "reset offset" nothing happens! It stays at 0.831v.

If I press on the pedals though, the voltage seems to increase to 0.3v or so...so the sensor doesn't seem dead.

As soon as I tightened the rear axle, the bike prompted me to recalibrate the sensor, but the problem is that this operation fails with the error W270100, and the offset stays constant at 0.831v.

It seems almost a software rather hardware issue, since the voltage changes when I press on the pedals (stepping on them), but I am not sure.

What else can I try? I didn't understand how to 2) check the plug connection: do I have to remove the wheel?
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#4
(19.09.2021, 10:53)funkyhog schrieb: I also checked on the service menu and the voltage fluctuates between 0.08 and 0.1 volts. There is also an offset of 0.831v. The issue is that if I hit "reset offset" nothing happens! It stays at 0.831v.
 
Offset is fine but 'voltage' is definitly to less and the reason why offset is not changing by hitting "Reset offset"

(19.09.2021, 10:53)funkyhog schrieb: If I press on the pedals though, the voltage seems to increase to 0.3v or so...so the sensor doesn't seem dead.

The increase in tension when the pedal is pressed is correct, but the voltage value of 0.3 V achieved is below the operating threshold of the OMNI.

(19.09.2021, 10:53)funkyhog schrieb: As soon as I tightened the rear axle, the bike prompted me to recalibrate the sensor, but the problem is that this operation fails with the error W270100, and the offset stays constant at 0.831v.

The reason for the error message is the still not reached minimum voltage of 0.5 V.

(19.09.2021, 10:53)funkyhog schrieb: It seems almost a software rather hardware issue, since the voltage changes when I press on the pedals (stepping on them), but I am not sure.

I don't think so, i assume a hardware issue. Either the source voltage 5V for the sensor is not fine (cable or plug issue) or the sensor is defective.  

(19.09.2021, 10:53)funkyhog schrieb: What else can I try? I didn't understand how to 2) check the plug connection: do I have to remove the wheel?

The plug in the right chain stay is covered with a plastic flap. To reveal the plug it has to be removed. This is only possible when the rear wheel is removed. You can messure as well the source voltage for the sensor at this point. If there is no 5V, the problem is with the cable to the OMNI, the TMM connector in the OMNI or the OMNI itself (I do not think the latter).

I only recommend removing the wheel yourself if you are familiar with such things. If there is still a warranty, I would definitely visit the dealer.
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