AMP EFI MS3Pro - Tooth; Trigger Logger and Troubleshooting RPM Issues

8.4 Tooth / trigger logger and troubleshooting RPM issues 8 TROUBLESHOOTING AND DATA LOGGING
128 64 32 16 8 4 2 1
Reserved Reserved VSS based
launch
VSS launch
lockout
PW 4X
mode
enabled
Water
injection low
Spark
disable test
mode
Injector
disable test
mode
• Stepper Idle position: The current stepper valve position (0 means fully closed.)
• Time: TunerStudio maintains a time since it was started and records this is the datalog. The time is shown
at the bottom of the graph area. This can be helpful if discussing a data log with someone online; you can
note what the time reading was when a problem occurs.
• Timing err: A calculation of how accurately the position of the next tach tooth was predicted. As the data log
sampling rate is very low compared to the frequency of the tach input, this number tends to bounce around
and is not nearly as useful as a tooth or composite log for analyzing RPM input problems.
• Total accel: Combination of TPS and MAP based components of acceleration enrichment.
• TPS: The 0-100% throttle (pedal) position (check the calibration settings if you do not get 0-100%)
• TPS accel: TPS based component of acceleration enrichment.
• TPSADC: The raw ADC input of the throttle (pedal) position.
• TPSdot: The rate of change of TPS, in percent throttle opening per second.
• VE1,2 The looked up VE value for channel 1,2. Blend tables are factored in.
• VSS1-4: Vehicle (wheel) speed sensor inputs in your chosen speed units.
• VSS1-4 ms-1: Vehicle (wheel) speed sensor inputs in meters per second.
• VSS1dot, VSS2dot: The rate of change of VSS (acceleration) measured in meters per second squared.
• VVT angle 1,2,3,4: The current relative angle of VVT cam 1,2,3,4
• VVT duty 1,2,3,4: The solenoid output duty cycle for VVT cam 1,2,3,4
• VVT target 1,2,3,4: The target angle of VVT cam 1,2,3,4
• WallFuel1: The calculated fuel puddle volume on the intake port walls, channel 1. Wall fuel numbers are
used for model based acceleration enrichment.
• WallFuel2: The calculated fuel puddle volume on the intake port walls, channel 2.
• Water Duty: The duty cycle to the water injection solenoid (or pump).
8.4 Tooth / trigger logger and troubleshooting RPM issues
Certain conditions such as electrical noise can cause the MS3Pro to lose sync with the engine position. This is
called a sync loss event or a sync error. Common symptoms of this include:
• Feels like a misfire or a false rev limiter
• RPM in datalog suddenly drops to zero
• RPM in datalog suddenly spikes up
• "Lost sync count" increments while "SecL" counts up normally. (NB. If SecL suddenly drops to zero this is a
"reset"; see section 8.1.)
AMP EFI MS3Pro manual version 1.202, firmware 1.5.0, 4/21/2017 Page 291