Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSSUBARU2012IMPREZA WRX STI F4-2.5L DOHC TURBOREPAIR AND DIAGNOSISACCESSORIES AND OPTIONAL EQUIPMENTANTITHEFT AND ALARM SYSTEMSTESTING AND INSPECTIONSCAN TOOL TESTING AND PROCEDURES
2012 Subaru Impreza WRX STI F4-2.5L DOHC Turbo
Scan Tool Testing and Procedures
2012 Subaru Impreza WRX STI F4-2.5L DOHC TurboSECTION Scan Tool Testing and Procedures
Subaru Select Monitor
OPERATION
1. HOW TO USE THE SUBARU SELECT MONITOR
1. Prepare the Subaru Select Monitor kit.
2. Connect the diagnosis cable to Subaru Select Monitor.
3. Connect the Subaru Select Monitor to data link connector.
1. Data link connector is located in the lower portion of the instrument panel (on the driver's side).

2. Connect the diagnosis cable to data link connector.
CAUTION: Do not connect scan tools other than the Subaru Select Monitor.
4. Turn the ignition switch to ON and start the Subaru Select Monitor.
5. Using the Subaru Select Monitor, call up DTCs and various data, then record them.
2. READ DIAGNOSTIC TROUBLE CODE DTC) FOR ENGINE AND BODY INTEGRATED UNIT
Refer to "Read Diagnostic Trouble Code" for information about how to indicate DTC. Read Diagnostic Trouble Code (DTC)
3. COMMUNICATION LINE CHECK
NOTE: The communication line between ECM and body integrated unit can be checked in "System Operation Check Mode". This is referred to as "Communication line check".
1. Connect the Subaru Select Monitor.
2. On <> display, select {Each System Check}.
3. On <> display, select {Engine Control System}.
4. Select [OK] after the information of engine type is displayed.
5. On <> display, select {System Operation Check Mode}.
6. On <> display, select {Immobilizer System}.
7. Start the communication line check.
8. Is <> displayed on screen? If displayed, go to step 9). If not, go to step 10).
9. After diagnostic results, it is determined that the circuit is not shorted. Finish the communication line check.
10. If a problem is detected, repair the trouble cause. P1572
OPERATION
1. HOW TO USE THE SUBARU SELECT MONITOR
1. Prepare the Subaru Select Monitor kit.
2. Connect the diagnosis cable to Subaru Select Monitor.
3. Connect the Subaru Select Monitor to data link connector.
1. Data link connector is located in the lower portion of the instrument panel (on the driver's side).
2. Connect the diagnosis cable to data link connector.
CAUTION: Do not connect scan tools other than the Subaru Select Monitor.
4. Turn the ignition switch to ON and start the Subaru Select Monitor.
5. Using the Subaru Select Monitor, call up DTCs and various data, then record them.
2. READ DIAGNOSTIC TROUBLE CODE DTC) FOR ENGINE AND BODY INTEGRATED UNIT
Refer to "Read Diagnostic Trouble Code" for information about how to indicate DTC. Read Diagnostic Trouble Code (DTC)
3. COMMUNICATION LINE CHECK
NOTE: The communication line between ECM and body integrated unit can be checked in "System Operation Check Mode". This is referred to as "Communication line check".
1. Connect the Subaru Select Monitor.
2. On <
3. On <
4. Select [OK] after the information of engine type is displayed.
5. On <
6. On <
7. Start the communication line check.
8. Is <
9. After diagnostic results, it is determined that the circuit is not shorted. Finish the communication line check.
10. If a problem is detected, repair the trouble cause. P1572
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.