Each manufacturer may define additional services above #9 (e.g.: service 22 as defined by SAE J2190 for Ford/GM, service 21 for Toyota) for other information e.g. Vehicle manufacturers are not required to support all services. Permanent Diagnostic Trouble Codes (DTCs) (Cleared DTCs) Show pending Diagnostic Trouble Codes (detected during current or last driving cycle)Ĭontrol operation of on-board component/system Test results, other component/system monitoring (Test results, oxygen sensor monitoring for CAN only) Test results, oxygen sensor monitoring (non CAN only) They are as follows:Ĭlear Diagnostic Trouble Codes and stored values Before 2002, J1979 referred to these services as "modes". There are 10 diagnostic services described in the latest OBD-II standard SAE J1979. 2.8.4 Service 01 PID 51 - Fuel Type Coding.2.8.3 Service 01 PID 1C - OBD standards this vehicle conforms to.2.8.2 Service 01 PID 12 - Commanded secondary air status.2.8.1 Service 01 PID 03 - Fuel system status.2.7.7 Service 09 PID 0B - In-use performance tracking for compression ignition engines.2.7.6 Service 09 PID 08 - In-use performance tracking for spark ignition engines.2.7.5 Service 03 (no PID required) - Show stored Diagnostic Trouble Codes.2.7.4 Service 01 PID 78 and 79 - Exhaust Gas temperature (EGT) Bank 1 and Bank 2.2.7.3 Service 01 PID 41 - Monitor status this drive cycle.2.7.2 Service 01 PID 01 - Monitor status since DTCs cleared.2.7.1 Service 01 PID 00 - Show PIDs supported.2.6 Service 09 - Request vehicle information.2.5 Service 05 - Test results, oxygen sensor monitoring (non CAN only).2.4 Service 04 - Clear Diagnostic Trouble Codes and stored values.2.3 Service 03 - Show stored Diagnostic Trouble Codes (DTCs).2.2 Service 02 - Show freeze frame data.Some heavy duty trucks in North America use the SAE J1962 OBD-II diagnostic connector that is common with passenger cars, notably Mack and Volvo Trucks, however they use 29 bit CAN identifiers (unlike 11 bit headers used by passenger cars). Heavy duty vehicles (greater than 14,000 lb ) made after 2010, for sale in the US are allowed to support OBD-II diagnostics through SAE standard J1939-13 (a round diagnostic connector) according to CARB in title. They are both required to be accessed through a standardized data link connector defined by SAE J1962. In 1996, light duty vehicles (less than 8,500 lb ) were the first to be mandated followed by medium duty vehicles (between 8,500–14,000 lb ) in 2005. Though not mandated, many motorcycles also support OBD-II PIDs. Manufacturers also define additional PIDs specific to their vehicles. All on-road vehicles and trucks sold in North America are required to support a subset of these codes, primarily for state mandated emissions inspections. SAE standard J1979 defines many OBD-II PIDs. OBD-II PIDs ( On-board diagnostics Parameter IDs) are codes used to request data from a vehicle, used as a diagnostic tool.
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