Basic Diagnostic Procedure: Procedure

1. Ask the customer when and how the trouble occurred using the interview check list. Refer to TRANSMISSION (DIAGNOSTICS)>Check List for Interview .
2. Before performing diagnostics, check the following items which might affect CVT problems.
   • General inspection Refer to TRANSMISSION (DIAGNOSTICS)>General Description>INSPECTION .
   • Disconnection of harness connector
   • Visual check for harness damage
   • Oil leakage
   • Stall test Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR580)>STALL TEST . Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>STALL TEST .
   • Secondary pressure test Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR580)>SECONDARY PRESSURE TEST . Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>SECONDARY PRESSURE TEST .
   • Line pressure test Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR580)>LINE PRESSURE TEST . Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>LINE PRESSURE TEST .
   • Transfer clutch pressure test Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR580)>TRANSFER CLUTCH PRESSURE TEST . Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>TRANSFER CLUTCH PRESSURE TEST .
   • Time lag test Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR580)>TIME LAG TEST . Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>TIME LAG TEST .
   • ROAD TEST Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR580)>ROAD TEST . Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>ROAD TEST .
   • Inhibitor switch Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR580)>INHIBITOR SWITCH . Refer 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.

Turn the ignition switch to ON and wait for at least 2 seconds.

Does the AT OIL TEMP light illuminate?

Yes  : Go to  3.

No  : Check the AT OIL TEMP light.

Start the engine and wait for 2 seconds or more.

Does the AT OIL TEMP light blink?

Yes  : Go to  4.

No  : Go to  5.

Read the DTC of [Transmission] using the Subaru Select Monitor. Refer to TRANSMISSION (DIAGNOSTICS)>Diagnostic Trouble Code (DTC) .

Are any DTCs displayed?

Yes  : Record the DTC, time stamp and freeze frame data. Go to  6.

No  : Go to  5.

1. Inspect using "Diagnostic Procedure without Diagnostic Trouble Code (DTC)". Refer to TRANSMISSION (DIAGNOSTICS)>Diagnostic Procedure without Diagnostic Trouble Code (DTC) .
2. Inspect using "Diagnostics with Phenomenon". Refer to TRANSMISSION (DIAGNOSTICS)>Diagnostics with Phenomenon .
3. Perform the road test. Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR580)>ROAD TEST . Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>ROAD TEST .
4. Read the DTC of [Transmission] using the Subaru Select Monitor. Refer to TRANSMISSION (DIAGNOSTICS)>Diagnostic Trouble Code (DTC) .

   Are any DTCs displayed?

   Yes  : Go to  6.

   No  : Finish the diagnosis.

1. Inspect by referring to "Diagnostic Procedure with Diagnostic Trouble Code (DTC)". Refer to TRANSMISSION (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC) .
   NOTE: For the DTC table, refer to "Diagnostic Trouble Code (DTC)". Refer to TRANSMISSION (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC)>LIST .
2. Repair or replace the cause of trouble.
3. Using the Subaru Select Monitor, perform the clear memory of [Transmission]. Refer to COMMON (DIAG)>CLEAR MEMORY .
4. Execute the inspection mode. Refer to TRANSMISSION (DIAGNOSTICS)>Inspection Mode .
5. Check the readiness code of [Transmission] using Subaru Select Monitor and confirm that the diagnosis is completed. Refer to TRANSMISSION (DIAGNOSTICS)>All Readiness Diagnostic Code(s) .
6. Read the DTC of [Transmission] using the Subaru Select Monitor. Refer to TRANSMISSION (DIAGNOSTICS)>Diagnostic Trouble Code (DTC) .

   Are any DTCs displayed?

   Yes  : Inspect by referring to "Diagnostic Procedure with Diagnostic Trouble Code (DTC)". Refer to TRANSMISSION (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC) .

   No  : Finish the diagnosis.