How To Use OBD-II General Scan Tool

Prepare a general scan tool (OBD-II general scan tool) required by SAE J1978.
Open the cover and connect the OBD-II general scan tool to the data link connector (A) located in the lower portion of the instrument panel (on the driver's side).

Fig 1: Identifying Data Link Connector Located In Lower Portion Of Instrument Panel
Courtesy of SUBARU OF AMERICA, INC.
Using the OBD-II general scan tool, call up diagnostic trouble code(s) 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 diagnostic trouble codes
4. MODE $04: Clear/Reset emission-related diagnostic information
Read out data according to repair procedures. (For detailed operation procedures, refer to the OBD-II General Scan Tool Operation Manual .)

NOTE: For details concerning diagnostic trouble codes, refer to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) .