Link ECU LLG Binary
v1.0.0Binary log files from Link ECU standalone engine management systems. Supports G4+, G4X, and related ECU models. Format characteristics: - Binary format with "lf3" magic at offset 4 - Header contains ECU model, date, time, software version - UTF-16 LE encoded strings for metadata and channel names - Channel blocks contain name (200 bytes), unit (200 bytes), and data - Data stored as f32 (value, time) pairs - Time values in seconds
File Format
Channels (57)
correction
knock_retardKnock RetardTiming retard from knock control
fuel_trimClosed Loop TrimClosed loop fuel trim
ect_fuel_trimECT Fuel TrimCoolant temperature fuel trim
iat_fuel_trimIAT Fuel TrimIntake air temperature fuel trim
drivetrain
gearGear PositionCurrent transmission gear
electrical
battery_voltageBattery VoltageSystem battery voltage
an_volt_1Analog Voltage 1Analog input 1 voltage
an_volt_2Analog Voltage 2Analog input 2 voltage
an_volt_3Analog Voltage 3Analog input 3 voltage
an_volt_4Analog Voltage 4Analog input 4 voltage
engine
rpmEngine RPMEngine speed from crankshaft sensor
tps_mainThrottle Position MainMain throttle position sensor
tps_subThrottle Position SubSecondary throttle position sensor
ap_mainAccelerator Position MainMain accelerator pedal position
ap_subAccelerator Position SubSecondary accelerator pedal position
boost_dutyBoost DutyWastegate solenoid duty cycle
vvt_intake_targetVVT Intake TargetTarget intake cam position
vvt_intake_actualVVT Intake ActualActual intake cam position
vvt_exhaust_targetVVT Exhaust TargetTarget exhaust cam position
vvt_exhaust_actualVVT Exhaust ActualActual exhaust cam position
e_throttle_targetE-Throttle TargetElectronic throttle target position
e_throttle_positionE-Throttle PositionElectronic throttle actual position
idle_targetIdle TargetTarget idle speed
idle_baseIdle Base PositionIdle stepper or solenoid base position
launch_rpm_targetLaunch RPM TargetLaunch control target RPM
fuel
lambdaLambdaLambda value from wideband O2
lambda_2Lambda 2Lambda value from second wideband O2
afrAir-Fuel RatioCalculated AFR from lambda
lambda_targetLambda TargetTarget lambda from fuel table
pulse_widthInjector Pulse WidthFuel injector pulse width
duty_cycleInjector Duty CycleFuel injector duty cycle
veVolumetric EfficiencyCalculated volumetric efficiency
ignition
ignition_advanceIgnition TimingSpark timing advance
dwellDwell TimeCoil dwell time
knock_level_1Knock Level 1Knock sensor 1 signal level
knock_level_2Knock Level 2Knock sensor 2 signal level
pressure
mapManifold PressureManifold absolute pressure
mgpManifold Gauge PressureManifold gauge pressure (relative)
barometricBarometric PressureAtmospheric pressure
fuel_pressureFuel PressureFuel rail pressure
oil_pressureOil PressureEngine oil pressure
boost_targetBoost TargetTarget boost pressure
speed
vehicle_speedVehicle SpeedVehicle ground speed
wheel_speed_flWheel Speed FLFront left wheel speed
wheel_speed_frWheel Speed FRFront right wheel speed
wheel_speed_rlWheel Speed RLRear left wheel speed
wheel_speed_rrWheel Speed RRRear right wheel speed
system
ecu_tempECU TemperatureECU internal temperature
error_codeError CodeActive error/fault code
temperature
fuel_tempFuel TemperatureFuel temperature
charge_tempCharge TemperatureIntake charge temperature estimate
coolant_tempEngine Coolant TemperatureEngine coolant temperature
iatIntake Air TemperatureIntake air temperature
oil_tempOil TemperatureEngine oil temperature
gearbox_tempGearbox TemperatureTransmission oil temperature
traction
traction_slipTraction SlipWheel slip percentage
traction_cutTraction CutTraction control ignition cut percentage
Metadata
- Time values may need recalculation relative to first timestamp
- Channel data uses sample-and-hold for sparse data
- File format has evolved across ECU generations