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
- CHECK PRE-INSPECTION
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- Ask the customer when and how the trouble occurred using the Check List for Interview. Ref. to TRANSMISSION (DIAGNOSTICS)>CHECK LIST FOR INTERVIEW
- Before performing diagnostics, check the following items which might affect CVT problems.
- General inspection Ref. to TRANSMISSION (DIAGNOSTICS)>GENERAL DESCRIPTION>INSPECTION
- Disconnection of harness connector
- Visual check for harness damage
- Oil leakage
- Stall test Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>STALL TEST
- Secondary pressure test Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>SECONDARY PRESSURE TEST
- Line pressure test Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>LINE PRESSURE TEST
- Transfer clutch pressure test Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>TRANSFER CLUTCH PRESSURE TEST
- Time lag test Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>TIME LAG TEST
- Road test Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>ROAD TEST
- Inhibitor switch Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>INHIBITOR SWITCH
Is the check result OK?
Yes : Go to 2.
No : Repair the items which may be affecting the CVT trouble.
- CHECK AT OIL TEMP LIGHT
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Start the engine and wait for 2 seconds or more.
Does the AT OIL TEMP light blink?
Yes : Go to 3.
No : Go to 4.
- CHECK DTC
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Read the DTC of [Transmission] using the Subaru Select Monitor. Ref. to TRANSMISSION (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC)
NOTE:If the communication function of the Subaru Select Monitor cannot be executed properly, check the communication circuit. Ref. to TRANSMISSION (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE FOR SUBARU SELECT MONITOR COMMUNICATION
Are any DTCs displayed?
Yes : Record the DTC, time stamp and freeze frame data. Go to 5.
No : Go to 4.
- PERFORM GENERAL DIAGNOSTICS
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- Inspect using "Diagnostic Procedure without Diagnostic Trouble Code (DTC)". Ref. to TRANSMISSION (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITHOUT DIAGNOSTIC TROUBLE CODE (DTC)
- Inspect using "Diagnostics with Phenomenon". Ref. to TRANSMISSION (DIAGNOSTICS)>DIAGNOSTICS WITH PHENOMENON
- Perform the road test. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>ROAD TEST
- Read the DTC of [Transmission] using the Subaru Select Monitor. Ref. to TRANSMISSION (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC)
Are any DTCs displayed?
Yes : Go to 5.
No : Finish the diagnosis.
- PERFORM DIAGNOSIS
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- Inspect by referring to "Diagnostic Procedure with Diagnostic Trouble Code (DTC)". Ref. to TRANSMISSION (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC) NOTE:
For the DTC table, refer to "Diagnostic Trouble Code (DTC)". Ref. to TRANSMISSION (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC)>LIST
- Repair or replace the cause of trouble.
- Using the Subaru Select Monitor, perform the clear memory of [Transmission]. Ref. to COMMON (DIAGNOSTICS)>CLEAR MEMORY
- Execute the inspection mode. Ref. to TRANSMISSION (DIAGNOSTICS)>INSPECTION MODE
- Check the readiness code of [Transmission] using Subaru Select Monitor and confirm that the diagnosis is completed. Ref. to TRANSMISSION (DIAGNOSTICS)>ALL READINESS DIAGNOSTIC CODE(S)
- Read the DTC of [Transmission] using the Subaru Select Monitor. Ref. to TRANSMISSION (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC)
Are any DTCs displayed?
Yes : Inspect by referring to "Diagnostic Procedure with Diagnostic Trouble Code (DTC)". Ref. to TRANSMISSION (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
No : Finish the diagnosis.
- Inspect by referring to "Diagnostic Procedure with Diagnostic Trouble Code (DTC)". Ref. to TRANSMISSION (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
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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