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OBD II Supported Parameters

The Auterra scan tool supports numerous live data parameters, statuses, readiness monitors, and test results. Live data parameters are parameters, or sensors, that provide real-time measurements (e.g. 32 mph). Statuses and readiness monitors provide a current status (e.g. Complete or Incomplete). And test results are measured by the vehicle's onboard computer and compared against internal pass/fail values.

The Windows-based and DashDyno software support the same parameters, except as noted below. For a complete list of Palm-based supported parameters, refer to the Palm User Manual located on the Downloads page. Note, not every vehicle supports every parameter. 

Live Data Parameters (Modes 1 and 2)

Tabular Format Live Data Parameters »         Enhanced OBD II Parameters » 

Air Fuel Ratio – overall air to fuel ratio of the vehicle being commanded.

Air Fuel Ratio BX-SX (up to 8) – air to fuel ratio of the vehicle computed for one bank (i.e. one oxygen sensor).

+Analog In (4 inputs, 3 ranges each) – the analog input voltage measured on the DashDyno auxiliary port.

Average Economy – the average fuel economy of the vehicle over time.

Battery Voltage – the vehicle battery voltage.

Boost Pressure – the pressure measured within the intake manifold.

+Digital In 1  – the digital input state (high or low) measured on the DashDyno auxiliary port.

Distance Traveled – distance traveled by the vehicle. This is not the odometer.

Drive Time – the engine running time.

Fuel Cost – the cost per gallon or liter of fuel.

Fuel Used – amount of fuel used by the vehicle.

Idle Percent – the ratio of Drive Time vs. Idle Time.

Idle Time – the engine idling time defined as the motor running with the vehicle speed at 0.

Instant Economy – is defined as the instantaneous fuel economy of the vehicle (e.g. MPG).

+GPS HDOP - horizontal dilution of precision. A measure of the GPS receiver’s position horizontal accuracy. The lower the number the more accurate the reading.

+GPS Satellites – the number of satellites currently being tracked by an external GPS receiver.

+GPS Speed – the speed of the vehicle as reported by an external GPS receiver.

Absolute Evaporative Vapor Pres – the evaporative system vapor pressure normally obtained from a sensor located in the fuel tank or a sensor in an evaporative system vapor line.

Absolute Load Value – indicates a percentage of peak available torque. 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 Pos (up to 4) – the absolute pedal position (not the relative or learned) pedal position.

Actual EGR A Duty (up to 2) – actual EGR displayed as a percent.

Actual Engine Torque – the calculated output torque of the engine.

Air Flow Rate From MAF – indicates the airflow rate as measured by the mass airflow sensor.

Alcohol Fuel Percentage – percentage of alcohol fuel contained in ethanol or methanol fuels.

Ambient Air Temperature – displays the ambient air temperature.

Average Demanded Consumption – average demanded reagent consumption by the engine system either over the previous complete 48 hour period of engine operation or the period needed for a demanded reagent consumption of at least 15 liters, whichever is longer.

Average Reagent Consumption – average reagent consumption by the engine system either over the previous complete 48 hour period of engine operation or the period needed for a demanded reagent consumption of at least 15 liters, whichever is longer.

Barometric Pressure – barometric pressure normally obtained from a dedicated barometric sensor. Note some weather services report barometric pressure adjusted to sea level. In these cases, the reported value may not match the displayed value.

Boost Pressure A (up to 2) –the actual turbocharger/supercharger pressure.

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.

Catalyst Temp Bank X – Sensor X (up to 4) –the catalyst substrate temperature.

Charge Air Cooler Temp BXSX – (up to 4) – the charge air cooler temperature.

Commanded Boost Pressure A (up to 2) – the ECU commanded turbocharger/supercharger pressure.

Commanded Fuel Rail Pressure A (up to 2) – the commanded fuel rail pressure when the reading is referenced to atmosphere (gauge pressure).

Commanded Injection Pressure A (up to 2) – the commanded injection control pressure.

Commanded Throttle Actuator A (up to 2) – the commanded throttle actuator.  0% fully closed and 100% fully open.

Commanded Variable Turbo A (up to 2) – the variable geometry turbocharger commanded vane position as a percent.

Commanded Throttle Actuator – displays 0% when the throttle is commanded closed and 100% when the throttle commanded open.

Commanded EGR (up to 3)  – 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 – the commanded equivalence ratio (also known as lambda) while the fuel system. Fuel systems that use conventional oxygen sensors display the commanded open loop equivalence ratio while the system is in open loop. Should report 100% when in closed loop fuel. Fuel systems that utilize wide-range/linear oxygen sensors shall display the commanded ratio in both open-loop and closed-loop operation.

Commanded Evaporative Purge – displays 0% when no evaporative purge is commanded and 100% at the maximum commanded purge position/flow.

Commanded Intake Air A (up to 2) – the commanded air intake displayed as a percent. Also known as EGR Throttle on compression ignition engineers.

Commanded Wastegate A (up to 2) – the commanded wastegate position as a percent.  0% is fully closed (full boost) and 100% fully open (dump boost).

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 MIL  On – accumulates the vehicle distance traveled while the MIL light is illuminated.

DPF Delta Pressure BX (up to 2) – diesel particulate filter delta pressure.

DPF Inlet Pressure BX (up to 2) – diesel particulate filter inlet pressure.

DPF Inlet Temp BX (up to 2) – diesel particulate filter inlet temperature.

DPF Outlet Pressure BX (up to 2) – diesel particulate filter outlet pressure.

DPF Outlet Temp BX (up to 2) – diesel particulate filter outlet temperature.

Driver Demand Torque – the requested torque output of the engine by the driver.

EGR Error (up to 3) – error as percent of actual commanded EGR. Negative percent is less than commanded and positive is more than commanded.

EGR Temperature BX-SX (up to 4) – the EGR gas temperature.

Engine Coolant Temp (up to 3) – engine coolant temperature derived from an engine coolant temperature sensor or a cylinder head temperature sensor.

Engine Fuel Rate – amount of fuel consumed by the engine per unit of time in liters per hour.

Engine Oil Temp – engine oil temperature.

Engine Reference Torque – display the engine reference torque value. This value does not change.

Engine RPM – displays the current engine revolutions per minute value.

Engine Torque Idle Point – the torque limit that indicates the available engine torque that can be provided by the engine at idle speed.

Engine Torque Point X (up to 4) – the torque limit that indicates the available engine torque that can be provided by the engine point X of the engine map.

Equivalence Ratio BX-SX (up to 16) - is defined as the ratio of the fuel-to-oxidizer ratio to the stoichiometric fuel-to-oxidizer ratio.

Evaporative System Vapor Press – evaporative system vapor pressure normally obtained from a sensor located in the fuel tank.

Exhaust Gas Temp BX-SX – exhaust gas temperature.

Exhaust Gas Pressure BX – exhaust gas pressure.

Fuel Injection Timing – the start of the mail fuel injection relative to Top Dead Center (TDC). Positive degrees indicate before TDC. Negative degrees indicate after TDC.

Fuel Level Input – indicates the nominal fuel tank liquid fill capacity as a percent of maximum.

Fuel Rail Press Relative Manifold – displays the fuel rail pressure referenced to the manifold vacuum (relative pressure).

Fuel Rail Pressure – indicates the fuel rail pressure at the engine referenced to atmosphere (gauge pressure).

Fuel Rail Pressure (abs) – fuel rail pressure at the engine when the reading is absolute.

Fuel Rail Pressure (gauge) – displays the fuel injection rail pressure at the engine when the reading is referenced to atmosphere (gauge pressure).

Fuel Rail Pressure A (up to 2) – fuel rail pressure when the reading is referenced to atmosphere (gauge pressure).

Fuel Rate – the rate at which fuel is consumed by the engine in gallons/hour or liters/hour.

Fuel Rail Temp A (up to 2) – the fuel rail temperature.

Hybrid Battery Pack Life – the percent remaining life for the hybrid battery pack.

Ignition Timing Advance – ignition timing advance for #1 cylinder (not including any mechanical advance).

Injection Pressure A (up to 2) - the injection control pressure.

Intake Air Temp BX-SX – displays the intake manifold air temperature.

Intake Air Temperature – displays the intake manifold air temperature.

Intake Manifold Absolute Pressure A (up to 2) – intake manifold absolute pressure.

Intake Manifold Pressure – indicates the manifold pressure derived from a Manifold Absolute Pressure sensor.

Long Term Fuel Trim-BX (up to 4) – indicates the correction being used by the fuel control system in both open and closed loop modes of operation.

Long Term Fuel Trim BX-SX (up to 8) - indicates the correction being used by the fuel control system in both open and closed loop modes of operation.

Manifold Surface Temp – intake manifold surface temperature.

Mass Air Flow A (up to 2) – airflow rate as measured by a vehicle MAF sensor or an equivalent source.

Minutes Run with MIL  On – accumulated minutes of engine run time while the MIL light is on.

NOx Concentration BX-SX (up to 2) – NOx concentration.

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.

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.

PM Mass Concentration BX-SX (up to 2) – particulate matter mass concentration.

Reagent Tank Level – nominal reagent tank liquid fill capacity as a percent of maximum.

Relative Throttle A Position (up to 2) - relative or “learned” throttle position.

Relative Throttle Position – relative or “learned” throttle position.

Relative Accelerator Pedal Pos - relative or “learned” pedal position.

Relative Intake Air A (up to 2) – actual intake airflow position displayed as a percent. Also knows as EGR Throttle Position on compression ignition engines.

Run Time NOx Warn – run time of the engine while NOx warning mode is activated.

Short Term Fuel Trim-BX (up to 4) – indicates the correction being used by the closed loop fuel algorithm. If the fuel system is open loop, 0% correction should be reported.

Short Term Fuel Trim BX-SX (up to 8) - indicates the correction being used by the closed loop fuel algorithm. If the fuel system is open loop, 0% correction should be reported.

Short Term Sec Fuel Trim BX (up to 4) – short term secondary O2 sensor fuel trim shall indicate the correction being utilized by the closed-loop fuel algorithm. If the fuel system is open loop, 0% correction should be reported.

Time Since DTCs Cleared – engine run time accumulated since DTCs were cleared.

Time Since Engine Start – indicates the elapsed time since the engine was started while the engine is running.

Total Engine Idle Time – total engine idle time for the life of vehicle.

Total Engine Run Time – total engine run time for the life of vehicle.

Total Engine Run w/PTO – total engine run time with PTO (power take off) engaged for the life of the vehicle.

Total Run w/IE-ACED X (up to 10) – total engine run time with Emission Increasing Auxiliary Emission Control Device active for the life of the vehicle.

Turbo A In Compressor (up to 2) – turbocharger compressor inlet temperature.

Turbo A In Turbine Temp (up to 2) – turbocharger turbine inlet temperature.

Turbo A Inlet Pressure (up to 2) – turbocharger inlet pressure.

Turbo A Out Compressor (up to 2) – turbocharger compressor outlet temperature.

Turbo A Out Turbine Temp (up to 2) – turbocharger turbine outlet temperature.

Turbo A RPM (up to 2) – turbocharger revolutions per minute.

Variable Turbo A (up to 2) – variable geometry turbocharger actual vane position as a percent. 0% when vanes are fully bypassed and 100% when the vanes are fully utilized.

Vehicle Speed – displays the vehicle road speed.

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).

Wastegate A (up to 2) – actual wastegate position as a percent. 0% wastegate is off (allow full boost) and 100% fully open (dump boost). 

Trouble Codes and Freeze Frame (Modes 2, 3, 4, 7, 13, 14, 17 and 18)

  • Stored Trouble Codes
  • Pending Trouble Codes
  • Freeze Frame (i.e. sensor measurements at time of Check Engine light illumination)

Statuses and Readiness Monitors (Mode 1)

  • 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
  • NMHC Catalyst Monitoring Status
  • NOx Aftertreatment Monitoring Status
  • Exhaust Gas Sensor Monitoring Status
  • EGR and/or VVT System Monitoring Status
  • PM Filter Monitoring Status
  • Boost Pressure System Monitoring Status
  • Type Of Fuel Currently Used
  • Emission Requirements Designed To
  • Boost Pressure A Status
  • Boost Pressure B Status
  • Variable Turbo A Status
  • Variable Turbo B Status
  • PTO Status Data
  • Auto Trans Neutral/Drive Status
  • Manual Trans Neutral/Drive Status
  • Glow Plug Lamp Status
  • Inside NOx Control Area
  • Outside NOx Control Area
  • Inside Mfr-Spec NOx NTE Carve-Out
  • NTE Deficiency for NOx Active Area
  • Inside PM Control Area
  • Outside PM Control Area
  • Inside Mfr-Spec PM NTE Carve-Out
  • NTE Deficiency for PM Active Area

ECU Oxygen Sensor Test Results (Mode 5)

Each supported oxygen sensor (up to 8) returns 1 or more of the following results. Each result consists of a measured value and a minimum/maximum test result pass/fail limit.

  • Rich to lean sensor threshold voltage (constant)
  • Lean to rich sensor threshold voltage (constant)
  • Low sensor voltage for switch time calculation (constant)
  • High sensor voltage for switch time calculation (constant)
  • Rich to lean sensor switch time (calculated)
  • Lean to rich sensor switch time (calculated)
  • Minimum sensor voltage for test cycle (calculated)
  • Maximum sensor voltage for test cycle (calculated)
  • Time between sensor transitions (calculated)
  • Sensor period (calculated)

ECU Test Result Parameters (Mode 6)

  • Misfire Monitor General Data
  • Mis-Fire Cylinder X Data (up to 12 cylinders)
  • Oxygen Sensor Monitor Bank X - Sensor X (up to 16 O2 sensors)
  • Catalyst Monitor Bank 1 (up to 4)
  • EGR Monitor Bank 1 (up to 4)
  • EVAP Monitor (up to 4)
  • Purge Flow Monitor
  • Oxygen Sensor Heater Monitor Bank 1 - Sensor 1 (up to 16 O2 sensors)
  • Heated Catalyst Monitor Bank 1 (up to 4)
  • Secondary Air Monitor (up to 4)
  • Fuel System Monitor Bank X (up to 4)
  • NOx Adsorber Monitor Bank X (up to 2)
  • NOx Catalyst Monitor Bank X (up to 2)
  • Boost Pressure Control Monitor Bank X (up to 2)
  • Fuel System Monitor Bank X (up to 4)
  • Heated Catalyst Monitor Bank X (up to 4)
  • Exhaust Gas Sensor Heater Monitor Bank X - Sensor X (up to 16)
  • Purge Flow Monitor
  • VVT Monitor Bank X (up to 4)
  • Exhaust Gas Sensor Monitor Bank X - Sensor X (up to 16)
  • PM Filter Monitor Bank X (up to 2)

Each test parameter above returns 1 or more of the following results. Each result consists of a measured value and a minimum/maximum test result pass/fail limit.

  • Misfire counts for last/current driving cycles (calculated)
  • EWMA misfire counts for last 10 driving cycles (calculated)
  • Rich to lean sensor threshold voltage (constant)
  • Lean to rich sensor threashold voltage (constant)
  • Low sensor voltage for switch time calculation (constant)
  • High sensor voltage for switch time calculation (constant)
  • Rich to lean sensor switch time (calculated)
  • Lean to rich sensor switch time (calculated)
  • Minimum sensor voltage for test cycle (calculated)
  • Maximum sensor voltage for test cycle (calculated)
  • Time between sensor transitions (calculated)
  • Sensor period (calculated)
Vehicle Information (Mode 9)
  • Vehicle Identification Number (VIN)
  • Calibration Identifications (CAL)
  • Calibration Verification Numbers (CVN)
  • OBD Monitor Conditions Encountered Counts
  • Ignition Counter
  • Catalyst Monitor Completion Counts Bank 1
  • Catalyst Monitor Conditions Encountered Counts Bank 1
  • Catalyst Monitor Completion Counts Bank 2
  • Catalyst Monitor Conditions Encountered Counts Bank 2
  • O2 Sensor Monitor Completion Counts Bank 1
  • O2 Sensor Monitor Conditions Encountered Counts Bank 1
  • O2 Sensor Monitor Completion Counts Bank 2
  • O2 Sensor Monitor Conditions Encountered Counts Bank 2
  • EGR Monitor Completion Condition Counts
  • EGR Monitor Conditions Encountered Counts
  • AIR Monitor Completion Condition Counts (Secondary Air)
  • AIR Monitor Conditions Encountered Counts (Secondary Air)
  • EVAP Monitor Completion Condition Counts
  • EVAP Monitor Conditions Encountered Counts

On-Board Bi-Directional Tests (Mode 8)

  • Evaporative System Leak Test

+ Parmeters marked with a plus (+) are supported by the DashDyno only. GPS-related parameters require an external GPS receiver. 

Not every vehicle supports every parameter.

Auterra OBD II Scan Tools, Performance Meters and Data Loggers

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