Back to PDA-Dyno™          Back to LaptopDyno™   The Nology LaptopDyno™ and PDA-Dyno™ / OBD II Scan Tool supports the following sensors and readiness monitors. Not every sensor is supported by all car manufacturers.  Supported Parameters Air Flow Rate From MAF – indicates the airflow rate as measured by the mass air flow sensor. Absolute Throttle Position – the absolute throttle position (not the relative or learned) throttle position. Usually above 0% at idle and less than 100% at full throttle. Calculated Load Value – indicates a percentage of peak available torque. Reaches 100% at wide open throttle at any altitude or RPM for both naturally aspirated and boosted engines. Engine Coolant Temp – engine coolant temperature derived from an engine coolant temperature sensor or a cylinder head temperature sensor. Engine RPM – displays the current engine revolutions per minute value. Fuel Rail Pressure (gauge) – displays the fuel rail pressure at the engine when the reading is referenced to atmosphere (gauge pressure). Ignition Timing Advance – ignition timing advance for #1 cylinder (not including mechanical advance). Intake Manifold Pressure – indicates the manifold pressure derived from a Manifold Absolute Pressure sensor. Long Term Fuel Trim-BX (up to 2) – indicates the correction being used by the fuel control system in both open and closed loop modes of operation. O2 Sensor BX-SX (up to 8) – indicates the voltage for conventional 0 to 1V oxygen sensors. O2 sensors with a different full-scale voltage shall be normalized to this range or, if a wide range sensor, may use the wide range parameters instead. Short Term Fuel Trim-BX (up to 2) – indicates the correction being used by the closed loop fuel algorithm. If the fuel system is open loop, 0% correction should be reported. Time Since Engine Start – shall increment the time since the engine was started while the engine is running. Vehicle Speed – displays the vehicle road speed. Absolute Load Value – is the normalized value of air mass per intake stroke displayed as a percent.  Absolute Throttle Position (up to 3) – the absolute throttle position (not the relative or learned) throttle position. Usually above 0% at idle and less than 100% at full throttle.  Accelerator Pedal Position (up to 3) - the absolute pedal position (not the relative or learned) pedal position. Usually above 0% at idle and less than 100% at full throttle.  Ambient Air Temperature – displays the ambient air temperature.  Barometric Pressure – barometric pressure normally obtained from a dedicated barometric sensor. Note some whether services report barometric pressure adjusted to sea level. In these cases, the reported value may not match the displayed value.  Catalyst Temp Bank X – Sensor X (up to 4) – displays the catalyst substrate temperature.  Commanded EGR – display 0% when the EGR is commanded off, 100% when the EGR system is commanded on, and if the EGR is duty cycled somewhere between 0% and 100%.  Commanded Equivalence Ratio – fuel systems that use conventional oxygen sensor displays the commanded open loop equivalence ratio while the system is in open loop. Should report 100% when in closed loop fuel. To obtain the actual air/fuel ratio being commanded, multiply the stoichiometric A/F ratio by the equivalence ratio. For example, gasoline, stoichiometric is 14.64:1 ratio. If the fuel control system was command an equivalence ratio of 0.95, the commanded A/F ratio to the engine would be 14.64 * 0.95 = 13.9 A/F.  Commanded Evaporative Purge – displays 0% when no purge is commanded and 100% at the maximum commanded purge position/flow.  Commanded Throttle Actuator – displays 0% when the throttle is commanded closed and 100% when the throttle commanded open.  Control Module Voltage – power input to the control module. Normally the battery voltage, less any voltage drop between the battery and the control module.  Distance Since DTCs Cleared – distance accumulated since DTCs where cleared with a scan tool.  Distance Traveled While MIL On – accumulates the vehicle distance traveled while the MIL light is illuminated.  EGR Error – error as percent of actual commanded EGR. Negative percent is less than commanded and positive is more than commanded.  Evap System Vapor Pressure – evaporative system vapor pressure normally obtained from a sensor located in the fuel tank.  Fuel Level Input – indicates the nominal fuel tank liquid fill capacity as a percent of maximum.  Fuel Rail Pressure – indicates the fuel rail pressure at the engine referenced to atmosphere (gauge pressure). Fuel Rail Pressure Rel Manifold – displays the fuel rail pressure referenced to the manifold vacuum (relative pressure).  Intake Air Temperature – displays the intake manifold air temperature.  Minutes Run with MIL On – accumulated minutes of engine run time while the MIL light is on. O2 Sensor BX-SX Wide Range mA (up to 8) – shows milliamps for linear or wide-ratio oxygen sensors.  O2 Sensor BX-SX Wide Range V (up to 8) – shows voltage for linear or wide-ratio oxygen sensors.  Relative Throttle Position – relative or “learned” throttle position. Time Since DTCs Cleared – accumulated time since DTCs where cleared with a scan tool.  Warm-ups Since DTCs Cleared – number of warm-up cycles since all DTCs were cleared via a scan tool. A warm-up is defined as the coolant temperature rising by at least 22°C (40°F) and the engine temperature reaches at a minimum 70°C (160°F) (60°C (140°F) for diesels). Trouble Codes and Freeze Frame Stored Trouble Codes Pending Trouble Codes Freeze Frame (i.e. sensor measurements at time of Check Engine light illumination) Status and Readiness Monitors OBD Requirement Fuel System 1 Status Fuel System 2 Status Secondary Air Status Auxiliary Input Status Misfire Monitor Status Fuel System Status Comprehensive Component Monitoring Status Catalyst Monitoring Status Heated Catalyst Monitoring Status Evaporative System Monitoring Status Secondary Air System Monitoring Status A/C System Refrigerant Monitoring Status Oxygen Sensor Monitoring Status Oxygen Sensor Heater Monitoring Status EGR System Monitoring Status ECU Oxygen Sensor Test Results Sensor Period Max Sensor Voltage Min Sensor Voltage High Sensor Voltage Low Sensor Voltage Rich to Lean Switch Time Lean to Rich Switch Time Lean to Rich Threshold Rich to Lean Threshold Time Between Transitions Minimum pass/fail limit Maximum pass/fail limit * Not every vehicle supports every parameter. 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