NOTE: Subaru Select Monitor (SSM) or an OBD-II scan tool must be used to perform self-diagnostic tests. Follow scan tool manufacturer's instructions for proper operation. SSM can be plugged into either the OBD-II DLC or the dedicated SSM test connectors behind the dash.

Connect scan tool to DLC located on lower left side of dash. See Fig 1. Retrieve Diagnostic Trouble Codes (DTCs) and freeze frame data, following scan tool manufacturer's instructions. Scan tool functions consist of:

MODE 01 - Current powertrain diagnostic data
MODE 02 - Powertrain freeze frame data
MODE 03 - Emission-related powertrain DTCs
MODE 04 - Clear/reset emission-related diagnostic information
MODE 05 - Oxygen sensor monitoring test results

RELATIONSHIP BETWEEN MODES & CONNECTORS

Mode

Read Memory Connector

Test Mode Connector

U-CHECK ⁽¹⁾

Disconnected

READ MEMORY ⁽¹⁾

Connected

Disconnected

D-CHECK ⁽¹⁾

Disconnected

Connected

CLEAR MEMORY ⁽²⁾

Connected

⁽¹⁾	Key on, engine off.

⁽²⁾	Key on, engine running.

Fig 1: Locating Diagnostic Test Connectors

Courtesy of SUBARU OF AMERICA, INC.

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Retrieving DTC(S)

Use the Manual With the Right Hardware

When to See a Mechanic