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 Speedo Sensor - Aditional Info

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Kiwi_Roy
Biondino
Biondino
Kiwi_Roy

Posts : 232
Join date : 2017-11-09

PostSubject: Speedo Sensor - Aditional Info   Wed Feb 20, 2019 1:13 pm

In trying to help a Breva owner with a dud speedo I learnt a little more about our speed sensors.

I assumed they were a simple reluctance sensor but no, they are a magnet biased Hall Effect switch, when the target passes the sensor it distorts the magnetic field causing the Hall Effect to change state.
From what I found out looking at generic switches of this type they have a very short range, only about 2mm.

Note: This is a printout from a V7 but I suspect they use the same sensor.
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Don't forget to seal the cable going into the sensor or for sure it will fail in the wet. The epoxy body is hard and the cable soft. The cable is not bonded but can move away from the body creating a perfect crack to wick water into the sensor where it will corrode or short out the connections.

Use a silicone sealant that won't go hard but flex with the cable.

I found that I can measure the output pulses if I plug the probes of my meter into the back of the 3 pin socket (loom side) Negative to pin 3, Positive to pin 2
I get a reading that drops from 10.4 VDC to 0.3 as the targets pass the sensor.
If the Voltage fails to reach 10 Volts it's probably moisture leaked through the gap between sensor and cable shorting to hold the Voltage down, try warming it up for a few hours, it may drive the moisture back out.

It's also possible to prove out the speedo itself from the 3 pin connector, I need to do some further testing on that to figure out the best way but I found simply touching a wire from pin 2 to 3 on the loom side will cause the speedo to read up scale (up to 300) for a second or two.
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tris1948
Don Abbondio
Don Abbondio
tris1948

Posts : 8
Join date : 2015-12-19

PostSubject: Re: Speedo Sensor - Aditional Info   Sat Mar 02, 2019 10:46 pm

Read this Roy it might helpĀ  [You must be registered and logged in to see this link.]

I followed the recommendations here and did the same on my Breva 1100 and it worked straight off the bat

If you do it though, before you lock the air gap down, ride the bike to your "Maximum Normal Velocity" and check that the speedo works properly

Above a ton (on a closed road officer) mine has a little hissy fitĀ  Wink
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Kiwi_Roy
Biondino
Biondino
Kiwi_Roy

Posts : 232
Join date : 2017-11-09

PostSubject: Re: Speedo Sensor - Aditional Info   Mon Mar 04, 2019 3:29 pm

I have been trying to help a guy with a Breva 850 sort out his speedo, we discovered the Breva uses a Honeywell IGP7001 switch potted into some plastic material.
I checked on my GRiSO, the speedo puts out a current of 3.3 milliamps to pull pin 2 of the connector high (about 10 Volts) the switch is capable of sinking 40 Milliamps, when it turns on it pulls pin 2 down from 10V to about 0.33 Volts.
The GRiSO must use a different switch (flatter package) but chances are it's a Honeywell also.

So it's very easy to check your speed sensor just plug the positive lead of your multimeter into the back of pin 2 of the 3 pin connector, the negative lead goes to pin 3 or chassis.

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Note:
Although this sensor is not used on the GRiSO the testing was carried out on my 2007 1100
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