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DTC P0730: Incorrect Gear Ratio: Notes

WARNING: This page is about a different variant/trim than selected.
  1. -

    DTC detecting condition: 

    Immediately at fault recognition

    Trouble symptom: 

    • Acceleration is poor during standing start.
    • Shift control malfunction
    • Engine speed increases abruptly.
    CAUTION: After servicing or replacing faulty parts, perform the last step of the basic diagnostic procedure. Ref. to TRANSMISSION (DIAGNOSTICS) (CROSSTREK MODEL)>BASIC DIAGNOSTIC PROCEDURE .
    G13617774Courtesy of SUBARU OF AMERICA, INC.
  1. CHECK TRANSMISSION FLUID  .

    Check the amount of ATF. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR580 CROSSTREK)>CVTF>INSPECTION .

    Is the check result OK?

    Yes  : Go to  2.

    No  : Adjust the amount of ATF. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR580 CROSSTREK)>CVTF>INSPECTION .

  2. CHECK TRANSMISSION FLUID  .

    Check the condition of ATF. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR580 CROSSTREK)>CVTF>REPLACEMENT .

    Is the check result OK?

    Yes  : Return ATF. Go to  3.

    No  : Check according to the "Corrective action" of ATF (CVTF) "CONDITION CHECK". Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR580 CROSSTREK)>CVTF>REPLACEMENT .

  3. CHECK INPUT SIGNAL FOR TCM  .
    1. Start the engine.
    2. Warm up until the ATF temperature reaches to 40 - 70°C (104 - 158°F).
    3. Set the select lever to "D" range.
    4. Drive at 2 km/h or more.
    5. Shift the select lever to "P" range.
    6. Stabilize the engine speed at idle.
    7. Using the Subaru Select Monitor, read data of [Actual line press.] in the [Data Monitor] of [Transmission]. Ref. to TRANSMISSION (DIAGNOSTICS) (CROSSTREK MODEL)>DATA MONITOR .

    Is [Actual line press.] 0.5 - 1.5 [MPa]?

    Yes  : Go to  4.

    No  : Perform the diagnosis according to DTC P0867. Ref. to TRANSMISSION (DIAGNOSTICS) (CROSSTREK MODEL>DIAQNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC P0867 TRANSMISSION FLUID PRESSURE .

  4. CHECK INPUT SIGNAL FOR TCM  .
    1. Lift up the vehicle.
    2. Set the select lever to "D" range.
    3. Release the brake pedal to stabilize the engine speed and front wheel speed.
    4. Using the Subaru Select Monitor, read data of [Actual Gear Ratio] in the [Data Monitor] of [Transmission]. Ref. to TRANSMISSION (DIAGNOSTICS) (CROSSTREK MODEL)>DATA MONITOR .

    Is [Actual Gear Ratio] 1.5 - 2.9?

    Yes  : Go to  5.

    No  : Go to  6.

  5. CHECK INPUT SIGNAL FOR TCM  .
    1. Set the select lever to "D" range.
    2. Slowly increase the speed to 40 km/h (25 MPH) and keep the constant speed.
    3. Using the Subaru Select Monitor, read data of [Actual Gear Ratio] in the [Data Monitor] of [Transmission]. Ref. to TRANSMISSION (DIAGNOSTICS) (CROSSTREK MODEL)>DATA MONITOR .

    Is [Actual Gear Ratio] 0.5 - 1.0?

    Yes  : Go to  6.

    No  : Replace the transmission assembly. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR580 CROSSTREK)>TRANSMISSION ASSEMBLY .

  6. DRIVING CHECK BY INSPECTION MODE  .
    1. Using the Subaru Select Monitor, perform the clear memory of [Transmission]. Ref. to COMMON (DIAG)>CLEAR MEMORY .
    2. Execute the inspection mode. Ref. to TRANSMISSION (DIAGNOSTICS) (CROSSTREK MODEL)>INSPECTION MODE .

    Does the AT OIL TEMP light blink and is DTC P0730 displayed?

    Yes  : Replace the transmission assembly. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR580 CROSSTREK)>TRANSMISSION ASSEMBLY .

    No  : Current condition is normal. It is possible that temporary poor contact occurs.

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