TPS stuck
#1
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Hi,
Its weekend, time for a new MS issue.
![CRX](https://www.miataturbo.net/images/smilies/pissed.gif)
I tried to calibrate my TPS, but it always reads 254.
I changed the wiring and the sensor itself.
Cables are OK and both sensors read the same values.
When I connect the sensor I just get 5V (reading 254) in the MS.
When I ground the MS input from the TPS sensor, I get 0V on the MS.
When I isolate the MS input the voltage builds up slowly, like a capacitor charging.
Any Ideas?
Stefan
Its weekend, time for a new MS issue.
![CRX](https://www.miataturbo.net/images/smilies/pissed.gif)
I tried to calibrate my TPS, but it always reads 254.
I changed the wiring and the sensor itself.
Cables are OK and both sensors read the same values.
When I connect the sensor I just get 5V (reading 254) in the MS.
When I ground the MS input from the TPS sensor, I get 0V on the MS.
When I isolate the MS input the voltage builds up slowly, like a capacitor charging.
Any Ideas?
Stefan
#4
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
All other values are OK.
I think I solved it.
I will test it tomorrow and post.
I connected only 2 wires to the TPS sensor.
I did not connect ground.
BUT: in this configuration you get a 5v voltage drop on the power supply (MS), when changing the resistence.
You get different current, but voltage stays constant.
When connecting the ground to the TPS you get a voltage divider and the current stays the same. In this case the voltage changes at the MS.
I think this is the way it should be.
Did you connect these wires to the TPS?
Megsaquirt 5V output?
Megasquirt input (normally the middle pin)
Ground (to MS sensor ground) ?
I think I solved it.
I will test it tomorrow and post.
I connected only 2 wires to the TPS sensor.
I did not connect ground.
BUT: in this configuration you get a 5v voltage drop on the power supply (MS), when changing the resistence.
You get different current, but voltage stays constant.
When connecting the ground to the TPS you get a voltage divider and the current stays the same. In this case the voltage changes at the MS.
I think this is the way it should be.
Did you connect these wires to the TPS?
Megsaquirt 5V output?
Megasquirt input (normally the middle pin)
Ground (to MS sensor ground) ?
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