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Home >> Subaru >> 2014 >> BRZ Limited, Automatic Trans >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transaxle (Diagnostics) >> Automatic Transmission System >> Function Inspection
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Function Inspection

  1. Check of shift lock operation
    1. Shift the select lever to the P position.
    2. Check that the select lever cannot be shifted to ranges other than P position when it is operated.
    3. Check that the select lever can be shifted to ranges other than P position with IG ON and the brake pedal depressed.
  2. Check of shift lock release button operation
    1. Remove the button cover.
    2. Use a driver or other tool to check that the select lever can be shifted to ranges other than P position when it is operated with the shift lock release button pressed.
  3. Time lag check
    CAUTION:
    • Always perform the inspection after the engine check and adjustment.
    • Perform the inspection at an oil temperature (60 to 90°C {140 to 194°F}) in normal driving temperature.
    • Perform the inspection with the A/C OFF.
    1. Apply the parking brake and set the wheel stoppers.
    2. Start the engine.
    3. Shift from N position to D or R position with idling while depressing the brake pedal, and measure the time until a small shock is felt.

      Standard value: N→D position 1.2 seconds or less

      N→R position 1.5 seconds or less

      CAUTION:
      • Make measurements 3 times and take the average value.
      • Allow 1 minute interval when performing consecutive measurements.
  4. Stall speed check
    CAUTION:
    • Always perform the inspection after the engine check and adjustment.
    • Perform the inspection at an oil temperature (60 to 90°C {140 to 194°F}) in normal driving temperature.
    • Perform the inspection with the A/C OFF.
    • Do not perform the operation continuously for 5 seconds or more. (Working time for the sequence from the accelerator full close, full open, stall speed reading, to the accelerator full close) Ignoring this instruction causes engine oil and ATF deterioration which has adverse effect on the clutch and brake.
    • Perform in a place with high μ(friction coefficient) such as on asphalt to prevent the tires from spinning.
    • 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 rpm 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. Firmly apply the parking brake and set the wheel stoppers.
    2. Start the engine.
    3. Firmly depress the parking brake with left foot, shift to D position, and quickly read the maximum engine speed when the accelerator pedal is fully depressed with right foot.
      STANDARD VALUE

      Stall speed [r/min] 2350±250
  5. 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 {140 to 194°F}) in normal driving temperature.
    • Perform the inspection with the A/C OFF.
    • Do not perform the inspection continuously for 5 seconds or more at stall. (Working time for the sequence from the accelerator full close, full open, stall speed reading, to the accelerator full close) Ignoring this instruction causes engine oil and ATF deterioration which has adverse effect on the clutch and brake.
    • 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 rpm 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 front AL.
    2. Remove the under cover COMPL T/M.
    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.
        Fig 1: Attaching SST On Transmission
        G08552712Courtesy of SUBARU OF AMERICA, INC.

        Captions in illustration

    5. Install the exhaust pipe ASSY FR.
    6. Firmly apply the parking brake and set the wheel stoppers.
    7. 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.
    STANDARD VALUE

    Shift position While idling [MPa {kgf/cm2 }] While stalling [MPa {kgf/cm2 }]
    D position 0.35 to 0.43 {3.6 to 4.4} 1.20 to 1.38 {12.2 to 14.0}
    R position 0.76 to 0.95 {7.7 to 9.7} 1.41 to 1.63 {14.4 to 16.6}
    NOTE: When there is an open or short circuit in the line pressure control solenoid ASSY (SLT) system, the line pressure reaches the maximum.
  6. Shift table
    WARNING: Observe the legal speed limit and confirm the safety on the road.
    CAUTION:
    • Always perform the inspection after the engine check and adjustment.
    • Perform the inspection at an oil temperature (40 to 110°C {104 to 230°F}) in normal driving temperature.
    • Perform the inspection at an engine coolant temperature of 60 to 90°C {140 to 194°F}.
    • Turn the A/C and the cruise control OFF.
    NOTE:
    • The values equal to or higher than the maximum speed are for reference because they cannot be achieved.
    • Do not shift to 6th gear when the AT oil temperature is less than 20°C {68°F}.
    • Lockup is prohibited when the AT oil temperature is less than 20°C {68°F}.
    • Lockup does not occur at 1st gear of manual mode.
    • Acceleration slipping lock-up is prohibited when the AT oil temperature is less than 40°C {104°F} or 110°C {230°F} or more.
    • Reduction slipping lock-up is prohibited when the AT oil temperature is less than 20°C {68°F} or 110°C {230°F} or more.
    1. Shift table
      1. Use SSM3 to select [Current Data Display & Save]→[Normal sampling], and then select [AT Speed], [Control the Shift Position], [Accel. Opening Angle], [A/T Oil Temperature], and [Coolant Temp].
      2. Confirm [AT Speed] when [Control the Shift Position] is up-shifted.
      Throttle opening angle 100% 5 to 10 %
      Shift point 1→2 2→3 3→4 4→5 5→6 1→2 2→3 3→4 4→5 5→6
      D position (km/h {MPH}) 47 to 53 {29 to 33} 96 {60} 142 {88} 201 {125} 282 {175} 12 {7} 20 {12} 30 {19} 48 {30} 59 {37}
    2. Lock-up
      1. Use SSM3 to select [Current Data Display & Save]→[Normal sampling], and then select [AT Speed], [Control the Shift Position], [Accel. Opening Angle], [Engine Speed], [Turbine Revolution Speed], [Coolant Temp.], and [Lock up status].
      2. Confirm that the difference between [Engine Speed] and [Turbine Revolution Speed] is 50 r/min or less.
      Throttle opening angle 5 to 10 %
      Lock-up ON
      Gear position 6th
      D position (km/h {MPH}) 57 {35} or more
    3. Manual downshift permission vehicle speed
      Shift position M6→M5 M5→M4 M4→M3 M3→M2 M2→M1
      Vehicle speed (km/h {MPH}) 284 {176} 201 {125} 142 {88} 95 {59} 53 {33}
  7. Driving test
    WARNING: Observe the legal speed limit and confirm the safety on the road.
    CAUTION:
    • Always perform the inspection after the engine check and adjustment.
    • Perform the inspection at an oil temperature (60 to 90°C {140 to 194°F}) in normal driving temperature.
    • Turn the A/C and the cruise control OFF.
    DRIVING TEST LIST

    Check item Inspection and confirmation procedure
    D position shift function Check shifting of 1st ←→2nd ←→3rd ←→4th ←→5th ←→6th during normal driving on city streets.
    Shift shock level during D position driving Check the shock level at each up-shifting during normal driving.
    Kick-down function
    • Perform kick-down operation in each gear and check for the down-shifting.
    • Check the shock level at kick down.
    Engine brake operation
    • Shift the select lever to "-" while driving in M position 6th gear (approx. 70 to 80 km/h {43 to 50 MPH}) and check the engine brake operation in 5th gear.
    • Shift the select lever to "-" while driving in M position 5th gear (approx. 55 to 65 km/h {34 to 40 MPH}) and check the engine brake operation in 4th gear.
    • Shift the select lever to "-" while driving in M position 4th gear (approx. 40 to 50 km/h {25 to 31 MPH}) and check the engine brake operation in 3rd gear.
    • Shift the select lever to "-" while driving in M position 3rd gear (approx. 25 to 35 km/h {16 to 22 MPH}) and check the engine brake operation in 2nd gear.
    • Shift the select lever to "-" while driving in M position 2nd gear (approx. 10 to 20 km/h {6 to 12 MPH}) and check the engine brake operation in 1st gear.
    Shift point at accelerator pedal in full throttle Start in D position with the accelerator pedal in full throttle and check that the up-shifting speed of 1st →2nd conforms to the shift point. (Refer to the shift table for shift point speeds)
    Lock-up function When the accelerator is lightly depressed while driving on a flat road at a constant speed within the lock-up speed range, check that the engine speed does not change greatly.
    P position operation Stop the vehicle on an uphill grade (approx. 5° or more) and shift to P position, then check that the vehicle does not move when the parking brake is released.
    Noise and vibration Check for noise and vibration during driving and shifting.
    Hill climb/down control function
    • Check that up-shifting is performed at higher engine speed than driving on a level road when climbing a hill in D position.
    • Check that down-shifting is performed at higher engine speed than driving on a level road when descending a hill in D position.
    Oil leakage Check that there is no oil leakage after the driving test.
  8. Manual driving test
    1. Disconnect the harness connector (24 pins) equipped with a lever on the upper part of the transmission.
    2. Check that gear shift conforming to each position occurs during driving.

      Criteria

      Fig 2: Disconnecting Harness Connector (24 Pins) Equipped With Lever On Upper Part Of Transmission
      G08552713Courtesy of SUBARU OF AMERICA, INC.
      Select lever position Gear position
      P position P
      R position R
      D position 4th
    3. Clear diagnostic codes after the manual driving test. (Refer to CHECKING/CLEARING DIAGNOSTIC CODES  )
  9. Check of solenoid operation
    1. SSM3-system operation check mode
      1. Turn the ignition switch to OFF.
      2. Connect SSM3 to the data link connector.
      3. Turn the ignition switch to ON with the engine stopped.
      4. Display the [System Operation Check Mode] screen according to the screen display.
      5. Perform the following active tests.
      SSM3 SCREEN: [WORK SUPPORT] →[SYSTEM OPERATION CHECK MODE]

      Item name Description Restriction
      [Activate the Solenoid(S1)] Turning ON←→OFF of transmission 3 way solenoid ASSY (S1) is possible.
      • Vehicle speed 0 km/h {0 MPH}
      • P or N position
      • Engine speed: 0 r/min
      [Activate the Solenoid(S2)] Turning ON←→OFF of transmission 3 way solenoid ASSY (S2) is possible.
      • Vehicle speed 0 km/h {0 MPH}
      • P or N position
      • Engine speed: 0 r/min
      [Activate the Solenoid(S3)] Turning ON←→OFF of transmission 3 way solenoid ASSY (S3) is possible.
      • Vehicle speed 0 km/h {0 MPH}
      • P or N position
      • Engine speed: 0 r/min
      [Activate the Solenoid(S4)] Turning ON←→OFF of transmission 3 way solenoid ASSY (S4) is possible.
      • Vehicle speed 0 km/h {0 MPH}
      • P or N position
      • Engine speed: 0 r/min
      [Activate the Solenoid(SL1)] MIN current ←→MAX current of clutch control solenoid No. 1 (SL1) is possible.
      • Vehicle speed 0 km/h {0 MPH}
      • P or N position
      • Engine speed: 0 r/min
      [Activate the Solenoid(SL2)] MIN current ←→MAX current of clutch control solenoid No. 1 (SL2) is possible.
      • Vehicle speed 0 km/h {0 MPH}
      • P or N position
      • Engine speed: 0 r/min
      [Activate the Solenoid(SLU)] MIN current ←→MAX current of lock-up control solenoid (SLU) is possible.
      • Vehicle speed 0 km/h {0 MPH}
      • P or N position
      • Engine speed: 0 r/min
      [Activate the Solenoid(SR)] Turning ON←→OFF of transmission 3 way solenoid ASSY (SR) is possible.
      • Vehicle speed 0 km/h {0 MPH}
      • P or N position
      • Engine speed: 0 r/min
      [Activate the Solenoid(SLT)] MIN current ←→MAX current of line pressure control solenoid ASSY (SLT) is possible.
      (MAX current →duty ratio 100% (line pressure at idling))
      (MIN current →duty ratio 0% (line pressure at stall))
      • Vehicle speed 0 km/h {0 MPH}
      • P or N position
      • Engine speed: 0 r/min
      SOLENOID CONDITION AT SHIFTING

      Symbol Operating condition
      ◦ Continuity status (ON)
      x Non-continuity status (OFF)
      AT NORMAL CONDITION

      Select lever position Gear position Transmission 3 way solenoid ASSY (S1) Transmission 3 way solenoid ASSY (S2) Transmission 3 way solenoid ASSY (S3) Transmission 3 way solenoid ASSY (S4) Transmission 3 way solenoid ASSY (SR) Clutch control solenoid No. 1 (SL1) Clutch control solenoid No. 1 (SL2)
      D position 1st x ◦ ◦ x ◦ x ◦
      2nd ◦ ◦ ◦ ◦ ◦ x x
      3rd ◦ x ◦ x ◦ x x
      4th ◦ x x x ◦ x ◦
      5th ◦ x x ◦ x ◦ x
      6th ◦ ◦ x ◦ x ◦ x
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