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G4 Xtreme - Internal Calibration Curve 0-150psi Pressure sensor

Tutorial del software Link G4 Plus

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I have a 0-150psi oil pressure sensor (0.5V-0psi, 4.5V=150psi), using the built-in "150psi TI sensor" calibration, on a Link G4 Xtreme.

Sensor is giving correct voltage signal for pressure (checked on multimeter) and this corresponds to the correct pressure in my Runtime Values "Analog Data - Voltage" for An V4, which shows as 40.9psi.

My understanding is that Link G4 makes an internal conversion to kPa and transmits this kPa value on the CAN. Why does the Oil Pressure show as 407 kPa in the Analog Data column? It looks like it is just multiplied by 10, which is not correct. Is there any way to modify how this is handled? Do I need to make my own custom calibration curve?

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Its a 20 year old ecu that was never originally designed to support different unit systems. It only had some relatively crude software workarounds added at the end of its life to allow different display units to be available for some common channels in PC Link.

If you choose a PSI based calibration then you need to use the "AN V*" runtime, the native "Oil Pressure (kPa)" runtime wont be correct in that case. The "10X" multiplier is applied to allow a 0.1 resolution when using Psi units via serial or CAN without changing the message format.

If you choose a kPa based calibration then you can use either the "AN V* - Oil press" or the native "Oil Pressure (kPa)" runtime, either will be correct.

Thanks Adam. It is good to understand why its like this and will have another attempt now I know what is going on.

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