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Home >> Subaru >> 2018 >> BRZ Limited, Automatic Trans >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transaxle (Diagnostics) >> Automatic Transmission System >> Pattern Select Switch System >> Inspection steps
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Inspection steps

  1. Reading of SSM4 data
    1. Connect the SSM4 to the DLC3.
    2. Turn the ignition switch to ON.
    3. Use SSM4 to display the [Data monitor] screen according to the screen display and check the computer data recorded when the SPORT mode switch is operated.
    PART NAME DESCRIPTION

    Item name [Symbol] Item description Display range Normal value Remarks
    SPORT SW Indicating pattern select (SPORT) switch
    ON←→OFF    		 Pattern select (SPORT) switch
    OFF→ON
    OFF→ON    		 -

    NG: Go to Step  3.

    OK: Go to next step

  2. Reading of SSM4 data
    1. Connect the SSM4 to the DLC3.
    2. Turn the ignition switch to ON.
    3. Use SSM4 to display the [Data monitor] screen according to the screen display and check the computer data recorded when the SNOW mode switch is operated.
    PART NAME DESCRIPTION

    Item name [Symbol] Item description Display range Normal value Remarks
    SNOW SW Indicating pattern select (SNOW) switch
    ON←→OFF    		 Pattern select (SNOW) switch
    OFF→ON
    OFF→ON    		 -

    NG: Go to Step  6.

    OK: Go to next step

    Go to the symptom table (Refer to SYMPTOM TABLE  )

  3. Check of pattern select switch ASSY unit
    1. Disconnect the connector D35 of pattern select switch ASSY
    2. Check the pattern select switch ASSY (SPORT switch) unit. (Refer to UNIT INSPECTION )

    NG: Replacement of pattern select switch ASSY (refer to PATTERN SELECT SWITCH ASSY )

    OK: Go to next step

  4. Check wiring harness and connector (pattern select switch - transmission control computer - chassis ground)
    1. Disconnect the connector A19 of the transmission control computer.
    2. Disconnect the connector D35 of pattern select switch ASSY
    3. Measure the resistance between the terminals.
      STANDARD VALUE RESISTANCE SPECIFICATION

      Inspection terminals Inspection conditions Standard value
      A19-13 (SPORT) -D35-4 (SPORT) Always Less than 1 Ω
      D35-8 - chassis ground Always Less than 1 Ω
      A19-13 (SPORT) - chassis ground Always 10 k Ω or more
    4. Connect the connector A19 of the transmission control computer.
    5. Connect the connector D35 of the pattern select switch ASSY

    NG: Repair or replacement of wiring harness or connector

    OK: Go to next step

  5. Replacement of transmission control computer ASSY
    1. Replace the transmission control computer. (Refer to TRANSMISSION CONTROL COMPUTER ASSY )

    AT unit correction (refer to WORK SUPPORT  )

  6. Check of pattern select switch ASSY unit
    1. Disconnect the connector D35 of pattern select switch ASSY
    2. Check the pattern select switch ASSY (SNOW switch) unit. (Refer to UNIT INSPECTION )

    NG: Replacement of pattern select switch ASSY (refer to PATTERN SELECT SWITCH ASSY )

    OK: Go to next step

  7. Wiring harness or connector check (pattern select switch - transmission control computer - chassis ground)
    1. Disconnect the connector A19 of the transmission control computer.
    2. Disconnect the connector D35 of pattern select switch ASSY
    3. Measure the resistance between the terminals.
      STANDARD VALUE RESISTANCE SPECIFICATION

      Inspection terminals Inspection conditions Standard value
      A19-24 (SNOW) -D35-6 (SNOW) Always Less than 1 Ω
      D35-8 - chassis ground Always Less than 1 Ω
      A19-24 (SNOW) - chassis ground Always 10 k Ω or more
    4. Connect the connector A19 of the transmission control computer.
    5. Connect the connector D35 of the pattern select switch ASSY

    NG: Repair or replacement of wiring harness or connector

    OK: Go to next step

  8. Replacement of transmission control computer ASSY
    1. Replace the transmission control computer. (Refer to TRANSMISSION CONTROL COMPUTER ASSY )

    AT unit correction (refer to WORK SUPPORT  )

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