Anyone know the math or scaling calculation used on the LMM and up high speed LAN ARBID 0x41C Byte 3 "Oil Pressure Value" ??
I've sorted out all the IC [gauge] related HS CAN packets streaming from the ECM/TCM, but the correct math on Oil Pressure is eluding me.. For EFI and OBDII based messages it works out correctly with 0x5e8 ID byte 4 (A*4) = oil pressures in KPA value.
IE: 0x5e8 fe 0b 3c 41 65 (0x41 / 65 decimal * 4 = 260 kpa or 37.70 psi)
However with 0x41C Byte3 that simple (A*4) equation doesn't work. I've manually logged several values points on the scale, like (100.4psi / 692.2kpa = 0x83 /131d) but the math that works there doesn't match up with (74.8psi / 515.72kpa = 0x62 /98d) and so on down the line. I've tried other commonly used equations like (A*100/255) with no luck..
Thanks
-K