OBD-II General Scan Tool: Operation

HOW TO USE OBD-II GENERAL SCAN TOOL
1. Prepare a general scan tool (OBD-II general scan tool) required by SAE J1978.
2. Open the cover and connect the OBD-II general scan tool to data link connector located in the lower portion of instrument panel (on the driver's side).
  
  Fig 1: Identifying Data Link Connector Location
  Courtesy of SUBARU OF AMERICA, INC.
3. Using the OBD-II general scan tool, call up DTC and freeze frame data.
  OBD-II general scan tool functions consist of:
  1. MODE $01: Current powertrain diagnostic data
  2. MODE $02: Powertrain freeze frame data
  3. MODE $03: Emission-related powertrain DTC
  4. MODE $04: Clear/Reset emission-related diagnostic information
  5. MODE $06: Request on-board monitoring test results for non-continuously monitored systems
  6. MODE $07: Request on-board monitoring test results for continuously monitored systems
  7. MODE $09: Request vehicle information
  Read out the data according to repair procedures. (For detailed operation procedures, refer to the OBD-II General Scan Tool Operation Manual.)
  
  NOTE: For details concerning DTC, refer to the List of Diagnostic Trouble Code (DTC). < Ref. to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . >
MODE $01 (CURRENT POWERTRAIN DIAGNOSTIC DATA)
Refers to data denoting the current operating condition of analog input/output, digital input/output and/or the powertrain system.

A list of the support data and PID (Parameter Identification) codes are shown in the following table.

Fig 2: Powertrain Diagnostic Data
Courtesy of SUBARU OF AMERICA, INC.

NOTE: Refer to OBD-11 general scan tool manufacturer's instruction manual to access generic OBD-11 PIDs (MODE $01).
MODE $02 (POWERTRAIN FREEZE FRAME DATA)
Refers to data denoting the operating condition when trouble is sensed by the on-board diagnosis system. A list of the support data and PID (Parameter Identification) codes are shown in the following table.

Fig 3: Powertrain Freeze Frame Data
Courtesy of SUBARU OF AMERICA, INC.

NOTE: Refer to OBD-II general scan tool manufacturer's instruction manual to access freeze frame data (MODE $02).
MODE $03 (EMISSION-RELATED POWERTRAIN DIAGNOSTIC TROUBLE CODE (DTC)
Refer to Read Diagnostic Trouble Code (DTC) for information about data denoting emission-related powertrain DTC. < Ref. to READ DIAGNOSTIC TROUBLE CODE (DTC) . >
MODE $04 (CLEAR/RESET EMISSION-RELATED DIAGNOSTIC INFORMATION)
Refers to the mode used to clear or reset emission-related diagnostic information (OBD-II trouble diagnostic information).

NOTE: Refer to OBD-II general scan tool manufacturer's instruction manual to clear or reset emission-related diagnostic information (MODE $04).
MODE $06
Refer to test value of troubleshooting and data of test limit on support data bit sequence table. List of support data is shown in the following table.

Fig 4: List Of Support Data Table
Courtesy of SUBARU OF AMERICA, INC.
MODE $07
Refer to data of DTC (pending code) for troubleshooting result about emission in first time.
MODE $09
Refer to data of vehicle specification (VIN, calibration ID, etc.).