TPS stuck
Hi,
Its weekend, time for a new MS issue. :crx: 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 |
What year MX-5 is this one? And how did you measure the sensor voltage?
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I have the same problem, no solution yet. Just curious, you get normal coolant and air temp readings?
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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) ? |
A TPS isn't going to work without a ground. You'll only see 5 volts all the time with this - which appears to be precisely what you're having go wrong.
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