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Basic Diagnostic Procedure: Procedure

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

      Is the item that is thought to influence the CVT problem working properly?

      Yes: Go to  2.

      No: Repair the items which may be affecting the CVT trouble.

  2. CHECK AT OIL TEMP LIGHT  .

    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.

  3. CHECK 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.

  4. CHECK DTC DISPLAY  .

    Read the DTC.

    NOTE: If the communication function of Subaru Select Monitor cannot be executed normally, check the communication circuit. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (DIAGNOSTICS) > Diagnostic Procedure for Subaru Select Monitor Communication > COMMUNICATION FOR INITIALIZING IMPOSSIBLE .

    Is DTC displayed on Subaru Select Monitor?

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

    Go to  6.

    NOTE:
    • For the time stamp, refer to LAN article. Ref. to LAN SYSTEM (DIAGNOSTICS) > General Description >-->  TIME STAMP  .
    • Depending on DTCs, time stamp may not be stored.

    No: Go to  5.

  5. PERFORM GENERAL DIAGNOSTICS  .
    1. Inspect using "Diagnostic Procedure without Diagnostic Trouble Code (DTC)". Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (DIAGNOSTICS) > Diagnostic Procedure without Diagnostic Trouble Code (DTC) .
    2. Inspect using "Diagnostics with Phenomenon". Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (DIAGNOSTICS) > Diagnostics with Phenomenon .
    3. Perform the Inspection Mode. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (DIAGNOSTICS) > Inspection Mode .
    4. Read the DTC.

    Is DTC displayed on Subaru Select Monitor?

    Yes: Go to  6.

    No: Finish the diagnosis.

  6. PERFORM DIAGNOSIS  .
    1. Inspect by referring to "Diagnostic Procedure with Diagnostic Trouble Code (DTC)". Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC) .
      NOTE: For the DTC table, refer to "List of Diagnostic Trouble Code (DTC)". Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (DIAGNOSTICS) > List of Diagnostic Trouble Code (DTC) .
    2. Repair the trouble cause.
    3. Perform the Clear Memory Mode.
    4. Perform the Inspection Mode. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (DIAGNOSTICS) > Inspection Mode .
    5. Read the DTC.

    Is DTC displayed on Subaru Select Monitor?

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

    No: Finish the diagnosis.

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