The OBD-II standard
SAE J1979
SAE J1979 is the standard that defines how a scan tool asks a car for diagnostic data. Each car sold in the US since 1996 answers its requests through the OBD-II port, and Pelican reads them from nearly every car built since then.
Carmakers also add their own commands for data that J1979 does not cover, such as battery charge or tire pressure. These commands differ per vehicle. The OBDb was established to document these facts.
Parameters
Connectables26
Absolute throttle position, Absolute throttle position B, Absolute throttle position C, Absolute Throttle Position G and 22 moreBattery11
Control module voltage, Enhanced Hybrid/EV Vehicle Charging State, Hybrid battery pack remaining charge, Hybrid/EV Battery System Current and 7 moreBattery › Internal4
Enhanced Hybrid/EV Vehicle Charging State supported?, Hybrid/EV Battery Current supported?, Hybrid/EV Battery Voltage supported?, Hybrid/EV Vehicle Charging State supported?Climate1
Ambient air temperatureClocks1
Time since engine startControl4
Absolute throttle position, Absolute throttle position B, Absolute throttle position C, Relative throttle positionControl › Pedals4
Accelerator pedal position (relative), Accelerator pedal position D, Accelerator pedal position E, Accelerator pedal position FDTCs8
Distance traveled since diagnostic trouble codes cleared, Distance traveled while MIL was activated, DTC that caused required freeze frame data storage, Engine run time since diagnostic trouble codes cleared and 4 moreDTCs › Status30
A/C system refrigerant monitoring, A/C system refrigerant monitoring completed, A/C system refrigerant monitoring ready, Catalyst monitoring and 26 moreDTCs › Support16
A/C system refrigerant monitoring supported, Catalyst monitoring supported, Comprehensive component monitoring enabled, Comprehensive component monitoring supported and 12 moreEmissions1
Emission requirements to which vehicle is designedEngine86
02S Bank 3, Sensor 1 present, 02S Bank 3, Sensor 2 present, 02S Bank 4, Sensor 1 present, 02S Bank 4, Sensor 2 present and 82 moreEngine › AuxInputs5
Auto Trans Neutral Drive Status, Glow plug lamp status, Manual Trans Neutral Gear Status, Power Take Off (PTO) Output Status and 1 moreEngine › AuxInputs › Internal5
Auto trans neutral drive status supported, Glow plug lamp status supported, Manual trans neutral gear status supported, Power Take Off (PTO) output status supported and 1 moreEngine › Internal53
Actual EGR A supported, Actual EGR A supported, Boost bressure A control status, Boost bressure A control status and 49 moreEngine › OxygenSensors19
02S Bank 1, Sensor 1 present, 02S Bank 1, Sensor 2 present, 02S Bank 1, Sensor 3 present, 02S Bank 1, Sensor 4 present and 15 moreFuel22
Alcohol fuel percentage, Commanded Fuel Rail Pressure A, Commanded Fuel Rail Pressure B, Engine exhaust flow rate and 18 moreFuel › Internal14
Commanded Fuel Rail Pressure A data supported?, Commanded Fuel Rail Pressure B data supported?, Fuel Rail Pressure A data supported?, Fuel Rail Pressure B data supported? and 10 moreMovement2
Maximum current vehicle speed limit, Vehicle speedOBD1
OBD requirements to which vehicle is designedTrips2
Engine odometer, Odometer
Commands
Each command that the standard defines, and the parameters that its response carries.
