# Diagnostics User presets Preinstalled operation modes of the USB Autoscope III. Waveform library Typical waveforms. Engine management diagnostic techniques. Ignition systems diagnosis How to make connections for diagnosis and descriptions of common ignition system malfunctions. PlugIn "Ignition phase measurement" Measuring timing advance. PlugIn "Phase measurement" Diagnostics of the engine mechanics by the pressure waveform. PlugIn "Time parameters" Automatic calculation of the impulse duration, duty cycle and frequency of a signal. PlugIn "Consumption" Measurement of the relative consumption of the fuel. Air flow sensor Techniques for diagnosing MAF sensors. Oxygen sensor Diagnosing voltage waveforms from Oxygen sensors. Throttle position sensor Diagnosing of the throttle position sensor. Low pressure transducer Dx Estimation of the engine mechanics.