1 Speedo sensor (yes another one) Sun Jan 12, 2020 8:59 am
tinyspuds
Life time member
Morning all,
While I fitted my new clutch the FD was sitting around the shop with the speedo sensor still fitted. It has previously worked fine and wasn’t abused while it sat on my bench.
After refit, no work.
The rest of the cluster still works fine so probably not an earth problem at that end.
The self cancel indicators don’t work, another indication that the sensor signal isn’t getting through.
I’ve deoxed the connector behind the side panel.
I’ve tried the soldering iron trick, not a flicker.
I’ve multi metered the connector behind the side panel and get a reading of around .3 V AC at tickover in first and this value seems to increase with engine speed.
The last post I’ve read on this says to expect a reading of around .1 V AC. It seems like if I’m getting a reading at all, then the sensor is probably working, regardless that it doesn’t produce any of the meter readings I’ve seen referenced here.
My questions are:
if I’m getting any reading of any value at the connector that increases with engine speed should I be looking further upline for a (probably connector) problem or could the wrong numbers still indicate a faulty sensor?
I know that there is a gap tolerance dimension between the sensor tip and the FD pickup, my sensor tip is almost flush with the sensor case, issue?
Is there a resistance (or other) test that I can do with just the sensor through to the first connector or would that only indicate connectivity rather than proper functionality?
Not stressing on this one as my gps shows speed, but I would like to get the odo and self cancel back on line.
Cheers, Stu
While I fitted my new clutch the FD was sitting around the shop with the speedo sensor still fitted. It has previously worked fine and wasn’t abused while it sat on my bench.
After refit, no work.
The rest of the cluster still works fine so probably not an earth problem at that end.
The self cancel indicators don’t work, another indication that the sensor signal isn’t getting through.
I’ve deoxed the connector behind the side panel.
I’ve tried the soldering iron trick, not a flicker.
I’ve multi metered the connector behind the side panel and get a reading of around .3 V AC at tickover in first and this value seems to increase with engine speed.
The last post I’ve read on this says to expect a reading of around .1 V AC. It seems like if I’m getting a reading at all, then the sensor is probably working, regardless that it doesn’t produce any of the meter readings I’ve seen referenced here.
My questions are:
if I’m getting any reading of any value at the connector that increases with engine speed should I be looking further upline for a (probably connector) problem or could the wrong numbers still indicate a faulty sensor?
I know that there is a gap tolerance dimension between the sensor tip and the FD pickup, my sensor tip is almost flush with the sensor case, issue?
Is there a resistance (or other) test that I can do with just the sensor through to the first connector or would that only indicate connectivity rather than proper functionality?
Not stressing on this one as my gps shows speed, but I would like to get the odo and self cancel back on line.
Cheers, Stu
Last edited by tinyspuds on Sun Jan 12, 2020 10:18 am; edited 1 time in total
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1985 BMW K100RT + Hedingham HUB and LL’s. VIN 0028106.
1986 K100RS in boxes. VIN 0141918.
1954 Royal Enfield 350 Bullet. Original.
2000 Hayabusa with Charnwood chair, Wasp forks and EZS wheels.