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.
Basic Diagnostic Procedure: Procedure
- PERFORM CUSTOMER INTERVIEW
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Ask the customer when and how the trouble occurred using the interview check list. Ref. to AUTO START STOP (DIAGNOSTICS)>CHECK LIST FOR INTERVIEW .
Did you interview the customer?
Yes: Go to 2 .
No: Perform the interview, and Go to 2 .
- CHECK Auto Start Stop OFF INDICATOR
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Does the Auto Start Stop warning light (yellow) illuminate?
Yes: Go to 3 .
No: Check the combination meter. Ref. to COMBINATION METER (DIAGNOSTICS)>ACTIVE TEST .
- CHECK SUBARU SELECT MONITOR COMMUNICATION
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Check for communication with TCM.
NOTE:If the communication function of the Subaru Select Monitor cannot be executed properly, check the communication circuit. Ref. to AUTO START STOP (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE FOR SUBARU SELECT MONITOR COMMUNICATION .
Is communication possible?
Yes: Go to 4 .
No: Check the communication circuit. Ref. to AUTO START STOP (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE FOR SUBARU SELECT MONITOR COMMUNICATION .
- CHECK DTC
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Read the DTC of [Auto Start Stop] using the Subaru Select Monitor. Ref. to AUTO START STOP (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .
Are any DTCs displayed?
Yes: Perform the diagnosis according to the DTC. After diagnosis, Go to 5 .
No: Perform diagnosis according to the procedures in the diagnostics with phenomenon. Ref. to AUTO START STOP (DIAGNOSTICS)>DIAGNOSTICS WITH PHENOMENON .
- PERFORM DIAGNOSIS
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- Using the Subaru Select Monitor, perform the clear memory of [Auto Start Stop]. Ref. to COMMON (DIAG)>CLEAR MEMORY .
- Execute the inspection mode. Ref. to AUTO START STOP (DIAGNOSTICS)>INSPECTION MODE .
- Read the DTC of [Auto Start Stop] using the Subaru Select Monitor. Ref. to AUTO START STOP (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .
Are any DTCs displayed?
Yes: Perform the diagnosis according to the DTC. Ref. to AUTO START STOP (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC)>LIST .
No: Finish the diagnosis.
Use the Manual With the Right Hardware
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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.
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