Sae J1979 Standard PATCHED Download Pdf
SAE standard J1979 defines many OBD-II PIDs. 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. Manufacturers also define additional PIDs specific to their vehicles. Though not mandated, many motorcycles also support OBD-II PIDs.
Sae J1979 Standard Download Pdf
Heavy duty vehicles (greater than 14,000 lb or 6,400 kg) made after 2010,[1] 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 13 CCR 1971.1. 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).
The table below shows the standard OBD-II PIDs as defined by SAE J1979. The expected response for each PID is given, along with information on how to translate the response into meaningful data. Again, not all vehicles will support all PIDs and there can be manufacturer-defined custom PIDs that are not defined in the OBD-II standard.
A request for this PID returns a single byte of data which describes which OBD standards this ECU was designed to comply with. The different values the data byte can hold are shown below, next to what they mean:
The majority of all OBD-II PIDs in use are non-standard. For most modern vehicles, there are many more functions supported on the OBD-II interface than are covered by the standard PIDs, and there is relatively minor overlap between vehicle manufacturers for these non-standard PIDs.
There is very limited information available in the public domain for non-standard PIDs. The primary source of information on non-standard PIDs across different manufacturers is maintained by the US-based Equipment and Tool Institute and only available to members. The price of ETI membership for access to scan codes varies based on company size defined by annual sales of automotive tools and equipment in North America:
CAN bus may also be used for communication beyond the standard OBD messages. Physical addressing uses particular CAN IDs for specific modules (e.g., 720h for the instrument cluster in Fords) with proprietary frame payloads.
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Systems for monitoring emissions have been mandatory in almost all vehicles for decades. The pioneer was the US government commission California Air Resource Board (CARB). As early as 1996, CARB established requirements for the detection and indication of emissions-related malfunctions in vehicles. The requirements for emissions-related diagnostics are laid down in the regulations on on-board diagnostics (OBD), now known as OBD II, and specified in the SAE J1979 standard for the USA and in the ISO 15031 standard for Europe.
In April 2021, SAE International published the Recommended Practice SAE J1979-2 (OBDonUDS). This standard is the successor to SAE J1979 and describes the communication between the OBD system and a scan tool based on the services standardized in ISO 14229 as Unified Diagnostic Services (UDS).
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