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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 P0712: Transmission Fluid Temperature Sensor "A" Circuit Low; DTC P0713: Transmission Fluid Temperature Sensor "A" Circuit High >> Inspection steps

Inspection steps

WARNING: This page is about a different variant/trim than selected.
NOTE: Read the freeze frame data using the SSM4. A part of the engine running conditions under which the engine trouble occurred is recorded in the freeze frame data, which is useful for troubleshooting.
  1. Transmission wire unit check (oil temperature sensor)
    1. Disconnect the connector A18 of the transmission control computer ASSY.
    2. Measure the resistance between the terminals.
      STANDARD VALUE RESISTANCE SPECIFICATION

      Inspection terminals Inspection conditions Standard value
      A18-22 (OIL) - A18-23 (EOIL) Always 79 to 156 kΩ
    3. Connect the connector A18 of the transmission control computer ASSY.

    NG: Go to Step  3.

    OK: Go to next step

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

    AT unit correction (refer to WORK SUPPORT  )

  3. Check wiring harness and connector (transmission wire - transmission control computer ASSY)
    NOTE: For the inspection procedure and precautions for wiring harnesses and connectors, refer to INSPECTION PROCEDURES FOR ELECTRICAL CIRCUITS AND HOW TO PERFORM .
    1. Disconnect the connector L4 of the transmission wire.
    2. Disconnect the connector A18 of the transmission control computer ASSY.
    3. Measure the voltage between the terminals. (Refer to ECM TERMINAL ARRANGEMENT  for terminal arrangement of transmission control computer ASSY)
      VOLTAGE SPECIFICATION

      Inspection terminals Inspection conditions Standard value
      L4-1 (EOIL) - chassis ground IG ON 1 V or less
      L4-9 (OIL) - chassis ground IG ON 1 V or less
    4. Measure the resistance between the terminals. (Refer to ECM TERMINAL ARRANGEMENT  for terminal arrangement of transmission control computer ASSY)
      STANDARD VALUE RESISTANCE SPECIFICATION

      Inspection terminals Inspection conditions Standard value
      A18-22 (OIL) - L4-9 Always 1 Ω or less
      A18-23 (EOIL) - L4-1 Always 1 Ω or less
      L4-1 (EOIL) - chassis ground Always 10 k Ω or more
      L4-9 (OIL) - chassis ground Always 10 k Ω or more
    5. Connect the connector L4 of the transmission wire.
    6. Connect the connector A18 of the transmission control computer ASSY.

    NG: Repair or replacement of wiring harness or connector

    OK: Go to next step

    Repair or replacement of transmission wire (refer to TRANSMISSION WIRE )

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