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.

Enter specific test mode by connecting or disconnecting read memory and/or test mode connectors as shown in the RELATIONSHIP BETWEEN MODES & CONNECTORS table. Connectors are located behind left side of instrument panel. See Fig 1.
Observe Malfunction Indicator Light (MIL) or oxygen sensor monitor light. Note any DTC(s). Long illumination periods of 1.2 seconds designate tens digit in numbered codes. Short illumination periods of .2 second designate ones digit in numbered codes.
Tens and ones digits are separated by a .3-second interval of non-illumination. For example: 3 long flashes (1.2 seconds each) followed by 5 short flashes (.2 second each) designate code 35.
After a 2-second break, the next stored code will be displayed. Once all existing DTCs have been displayed, sequence will repeat.

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