Can anyone tell me how to calibrate the sensors with only the resistance values from a multimeter at various temps.
Normally I'd do it on the car and look at the sensor voltage but it's not possible right now.
Many thanks Baz
Temp Sensor Calibration
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- Posts: 1622
- Joined: Fri Feb 28, 2014 1:03 pm
- ECU Model: S40 Pro
- Distributor: DTA
- Firmware Version: 79
Re: Temp Sensor Calibration
mV = 5000 ( R /(R + 1000))
where R is your resistance.
If you're really picky, you can replace the 5000 with the actual mV shown in the Diagnostic Display. However, as most sensors are only accurate to either 5 or 10%, it's not going to make any noticeable difference.
where R is your resistance.
If you're really picky, you can replace the 5000 with the actual mV shown in the Diagnostic Display. However, as most sensors are only accurate to either 5 or 10%, it's not going to make any noticeable difference.
Re: Temp Sensor Calibration
Perfect thanks.
Re: Temp Sensor Calibration
I've another question.
Can someone transpose the equation above to work out R if i already know the mV.
Thanks.
Can someone transpose the equation above to work out R if i already know the mV.
Thanks.
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- Posts: 1622
- Joined: Fri Feb 28, 2014 1:03 pm
- ECU Model: S40 Pro
- Distributor: DTA
- Firmware Version: 79
Re: Temp Sensor Calibration
If my algebra is correct, it's
R = (1000 * mV) / (5000 - mV)
Curious to know why, though?
R = (1000 * mV) / (5000 - mV)
Curious to know why, though?
Re: Temp Sensor Calibration
I'm making a 12 position calibration switch, I know what voltages I want the ecu to see so need to select the correct value resistors.
Cheers Baz.
Cheers Baz.