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Home >> Subaru >> 2020 >> BRZ tS >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 2 (Automatic Transaxle (Diagnostics)) >> Automatic Transmission System >> DTC P0729: Gear 6 Incorrect Ratio >> Inspection steps

Inspection steps

WARNING: This page is about a different variant/trim than selected.
  1. Read the diagnostic code
    1. Follow the SSM4 on-screen instructions to check the diagnostic codes. (Refer to CHECK LIST FOR INTERVIEW  )
    RESULT DESCRIPTION

    Result Go to
    Only P0729 and P2714 are output. A
    P0729, P2714 and other diagnostic codes are output. B

    B: Progress to the relevant diagnosis code chart (Refer to LIST OF DIAGNOSTIC CODES  )

    A: Go to next step

  2. Shift position check
    CAUTION:
    • Perform the inspection at an oil temperature (60-90°C) in normal driving condition.
    • Turn the A/C and the cruise control OFF.
    1. Drive in manual mode and check the shift position.
      WARNING: Confirm the safety on the road.
      Gear position of transmission control computer ASSY 1st 2nd 3rd 4th 5th 6th
      Gear positions when problems occur 1st 2nd 3rd 4th 5th 4th

      Criteria: Shift position changes. 

    NG: Repair or replacement of transmission valve body ASSY (refer to TRANSMISSION VALVE BODY ASSY )

    OK: Go to next step

  3. Line pressure check
    CAUTION:
    • Wash the equipment and hoses with appropriate detergent before and after measurement.
    • Always perform the inspection after the engine check and adjustment.
    • Perform the inspection at an oil temperature (60 to 90°C) in normal driving condition.
    • Perform the inspection with the A/C OFF.
    • Do not perform the inspection continuously for 5 seconds or more at stall. (Time from the accelerator full close to full open, stall speed reading and the accelerator full close)
    • After performing the stall test, be sure to cool down the engine for at least 1 minute with the select lever set in P or N position, and at an idle speed of 1200 r/min or less.
    • If the stall speed is higher than the specified range, finish the stall test in as short a time as possible, in order to prevent the automatic transmission from being damaged.
    • Perform the stall test in normal mode.
    1. Remove the under cover No. 1.
    2. Remove the under cover No. 2.
    3. Remove the exhaust pipe ASSY FR.
    4. Attach the SST on the transmission.

      SST 18681AA040, 498897700, 498575400

      CAUTION:
      • Use 18681AA040 with genuine O-ring (17006AA000) attached.
      • Route the hose so that it does not contact the exhaust pipe.
      G12587361Courtesy of SUBARU OF AMERICA, INC.
    5. Install the center exhaust pipe.
    6. Firmly apply the parking brake and set the wheel stoppers.
    7. Remove the test plug, install the gauge and start the engine.
    8. Firmly depress the brake pedal with left foot and shift to D or R position, then check the hydraulic pressure at idling and stalling.
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