14.6V at Battery, MS reporting 13.2V
As the title suggests, MSPNP PRO is reporting 13.2V in Tunerstudio but when measured with a DMM I see 14.6V. Fresh WestCo battery and high amp alternator.
ECU ground bad? Calibrate battery voltage in TS? |
Where are you checking the voltage with the DMM at? I would check it across +12 and GND at the ECU header and see if there is a discrepancy between there and the ECU readings and go from there.
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a running engine typically outputs 14.4v or so, to charge the battery
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Just wondering why such a discrepancy. I upgraded from ms2, when the voltage used to be accurate.
measured across posts |
Originally Posted by MetalMuffins
(Post 1560398)
Where are you checking the voltage with the DMM at? I would check it across +12 and GND at the ECU header and see if there is a discrepancy between there and the ECU readings and go from there.
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Originally Posted by ATX.
(Post 1560403)
Best way to probe the wire while its connected?
Maybe someone else can chime in and confirm or deny if I'm full of it :m-freak: |
Tunerstudio has a calibrate battery voltage tool that I have never touched. I got the MS second hand and it has been running great, just a lil OCD about discrepancies. I want to start there before I start taking things physically apart when there is no issue with driveability
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MS should be calibrated to represent the voltage at the injector, or possibly at the alternator for NB applications.
I personally prefer the injector as long as the alternator voltage at high load is still reasonable. |
Sounds like Battery Voltage should be labeled Injector Voltage
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