koracing Posted July 16, 2023 Report Share Posted July 16, 2023 On 7/15/2023 at 3:43 AM, Adamw said: This was different in G4+ which could end up with a zero offset stored from a previous calibration that would cause subsequent cal to fail It must have been with a G4+ I had to use that trick then... On 7/14/2023 at 9:34 PM, Brian B said: I tried this, I had to blow into the vacuum line to trick the map to calibrate, once it had I then tried to re-calibrate and it failed again. Power supply to the ecu, and sensor as well as good grounds can make a bit of a difference in how accurately the sensors read. Is it possibly you have a grounding issue? Quote Link to comment Share on other sites More sharing options...
Brian B Posted July 16, 2023 Report Share Posted July 16, 2023 Did check both sensor ground and sensor 5V, both good Quote Link to comment Share on other sites More sharing options...
jdniss Posted July 17, 2023 Report Share Posted July 17, 2023 On 7/15/2023 at 8:43 PM, Adamw said: @jdniss I think you should get your ECU back to Link for inspection, I suspect your MAP sensor is probably faulty, in your log the voltage on AN Volt 3 is a good 50mV or 10Kpa higher than it should be. Contact [email protected] to arrange. No problems, thanks for looking into it. Quote Link to comment Share on other sites More sharing options...
Adamw Posted July 17, 2023 Report Share Posted July 17, 2023 @Brian B I suspect in your case the built-in "Link 3 Bar" calibration in the firmware might be wrong. At least with the little bit of testing I done today I was getting low values reported by PC Link vs what I calculate from voltage using the manufacturer's transfer function. I just asked the Firmware team to confirm so I will come back to you when I have an answer. koracing 1 Quote Link to comment Share on other sites More sharing options...
Adamw Posted July 18, 2023 Report Share Posted July 18, 2023 @Brian B We looked at this closer today. There is a bit of error at the high end of the calibration range but it is much less significant than I first thought and im not sure if it is enough to cause your calibration issue. I notice your 5V output is sitting a little lower than normal too which may be some of the error. Can you try a custom linear cal like below to see if it passes MAP cal with this. If it doesnt can you go around and unplug a few of your other sensors to see if the 5V output voltage gets closer to 5.00V (it was reading 4.96V when your map was last saved). Quote Link to comment Share on other sites More sharing options...
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