8.3 Data log fields 8 TROUBLESHOOTING AND DATA LOGGING
8.3 Data log fields
The data log fields represent not only the main sensor inputs but also a large number of the MS3Pro’s internal
calculations. Here is a complete list of what data you can view.
8.3.1 Understanding data log bit fields
Several of the data log fields are a bit code. To decipher a bit field, you need to determine what combination
of numbers adds up to the final number. Do this by taking the first code number that is smaller than the value
displayed, subtract that, and repeat the process until you’ve used up all the numbers. For example, suppose you
have a CEL Status code of 15. Here’s what you would do.
• The highest number on the chart that is less than 15 is 8. TPS fault. So we have a TPS fault present.
• Subtract 8 from 15, giving us 7. We’ll need to see what codes make up the 7.
• The next lowest value is 4. CLT sensor fault. So there is also a CLT sensor fault.
• Subtracting 4 from 7 gives us 3. So we have more codes to find.
• The next lowest number on the chart is 2. MAT sensor fault.
• Subtracting 2 from 3 gives us 1. This is the last code, a MAP sensor fault.
The above combination of faults is likely to be a problem with the VREF voltage or sensor return wiring, if you run
into this status in the real world.
8.3.2 Complete list of fields
These are the fields you can read with an MS3Pro on its own. Some of these fields are only logged if the appro-
priate settings requiring its use are enabled. CAN expansion devices may add more fields; see the documentation
for your CAN device if you are using one.
• Accel X, Y, Z: These record the accelerometer data in the X, Y, and Z direction in meters per second.
• AFR (1-8): Air/fuel ratio readings. The MS3Pro can connect to four widebands on its own, and can read up
to eight if using CAN based expansion devices.
• AFR load: The load variable being used for the AFR target table.
• AFR Target 1: The current target value for AFR, looked up from the active AFR target table.
• AFR target 1 error: The difference between actual and target AFR.
• ALS added fuel: The fuel pulsewidth (time) adder due to the anti-lag system.
• Alternator control duty: The duty cycle of the output being used to control the alternator.
• Alternator control frequency: Output frequency to control alternator, if using frequency based alternator
control mode.
• Alternator load: Measured load on the alternator.
• Alternator target voltage: The voltage being targeted by the alternator control system.
• Barometer: The barometer reading. This will show a current value if a dedicated baro sensor is installed,
the initial MAP reading, or 100 kPa if barometric correction is disabled.
• Battery Voltage: The measured battery voltage. If this is radically different from your actual battery voltage,
check for wiring faults.
• Battery Current: The measured battery current measured through the alternator control system.
• Boost Duty 1,2: The current duty cycle output to the boost solenoids 1 and 2.
AMP EFI MS3Pro manual version 1.202, firmware 1.5.0, 4/21/2017 Page 284
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