This SAE Recommended Practice defines diagnostic test modes@ and request and response messages@ necessary to be supported by vehicle manufacturers and test tools to meet the requirements of the California OBD II regulations@ which pertain to vehicle emission-related data only. These messages are intended to be used by any service tool capable of performing California OBD II mandated diagnostics. Diagnostic Test Modes included in this document are: a. Model $01-Request Current Powertrain Diagnostic Data Analog inputs and outputs Digital inputs and outputs System status information Calculated values b. Mode $02-Request Powertrain Freeze Frame Data Analog inputs and outputs Digital inputs and outputs System status information Calculated Values c. Mode $03-Request Emission-Related Powertrain Diagnostic Trouble Codes d. Mode $04-Clear/Rest Emission-Related Diagnostic Information e. Mode $05-Request Oxygen Sensor Monitoring Test Results For each test mode@ this document includes: a. Functional descriptions of test mode b. Request and response message formats
SAE J1979-1991 history
2024SAE J1979DA-2024 J1979-DA, Digital Annex of E/E Diagnostic Test Modes
2023SAE J1979DA-2023 J1979-DA, Digital Annex of E/E Diagnostic Test Modes
2023SAE J1979-3-2023 Brake-Stroke Indicator Design Guideline for Cam or Disc Air-Brake Actuators
2022SAE J1979DA-2022 J1979-DA, Digital Annex of E/E Diagnostic Test Modes
2022SAE J1979-3-2022 E/E Diagnostic Test Modes: Zero Emission Vehicle Propulsion Systems on UDS (ZEVonUDS)
2021SAE J1979DA-2021 J1979-DA, Digital Annex of E/E Diagnostic Test Modes
2021SAE J1979-DA-2021 Digital Annex of E/E Diagnostic Test Modes (See Also SAE J1979; Includes Access to Additional Content)
2019SAE J1979DA-2019 J1979-DA, Digital Annex of E/E Diagnostic Test Modes
2019SAE J1979-DA-2019 Digital Annex of E/E Diagnostic Test Modes (See Also SAE J1979)
2017SAE J1979DA-2017 J1979-DA, Digital Annex of E/E Diagnostic Test Modes
2017SAE J1979-DA-2017 Digital Annex of E/E Diagnostic Test Modes (See Also SAE J1979)