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Home >> Lexus >> 2021 >> LS 500 Base, AWD >> Repair and Diagnosis (Single Page) >> Transmission >> Transmission Control Systems >> Electronic A/T Shift Lever System (Aga0F) - Diagnostic Codes (1 Of 5) >> Electronic Shift Lever System >> DTC P085D-94: Gear Shift Control Module "A" Unexpected Operation [09/2018 - 10/2023] >> Procedure

DTC P085D-94: Gear Shift Control Module "A" Unexpected Operation [09/2018 - 10/2023]: Procedure

  1. CHECK DTC OUTPUT (TRANSMISSION) 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Enter the following menus: Powertrain / Transmission / Trouble Codes.

      Powertrain > Transmission > Trouble Codes 

    4. Check for DTCs.

      Result

      Result Proceed to
      None of the DTCs in the table below are output. A
      Any of the DTCs in the table below are output. B
      Priority Relevant DTC
      1 U1107-00 Lost Communication with Power Management Module (Gear Shift Control Module "A")
      2 P0720-31 Output Speed Sensor No Signal
      P0720-14 Output Speed Sensor Circuit Short to Ground or Open
      P0720-12 Output Speed Sensor Circuit Short to Battery
      W/ VACUUM BRAKE BOOSTER:

      3 C0500-12, C0506-12 Front Wheel Speed Sensor Circuit Short to Battery
      C0500-14, C0506-14 Front Wheel Speed Sensor Circuit Short to Ground or Open
      C0500-1F, C0506-1F Front Wheel Speed Sensor Circuit Intermittent
      C0500-23, C0506-23 Front Wheel Speed Sensor Signal Stuck Low
      C050C-12, C0512-12 Rear Wheel Speed Sensor Circuit Short to Battery
      C050C-14, C0512-14 Rear Wheel Speed Sensor Circuit Short to Ground or Open
      C050C-1F, C0512-1F Rear Wheel Speed Sensor Circuit Intermittent
      C050C-23, C0512-23 Rear Wheel Speed Sensor Signal Stuck Low
      W/O VACUUM BRAKE BOOSTER:

      3 C1464 Front Speed Sensor RH Circuit
      C1465 Front Speed Sensor LH Circuit
      C1466 Rear Speed Sensor RH Circuit
      C1467 Rear Speed Sensor LH Circuit

      HINT: 

      The chart above is listed in inspection order of priority.

    5. Turn the engine switch off.

    Result: 

    B 

    GO TO DTC CHART 

    Result: 

    A 

    See step  2

  2. CHECK FREEZE FRAME DATA 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Enter the following menus: Powertrain / Transmission / Trouble Codes / P085D-94 / Freeze Frame Data / Vehicle Speed, Speed (SP2).

      Powertrain > Transmission 

      Tester Display Measurement Item Range
      Vehicle Speed Vehicle speed Min.: 0 km/h (0 mph)
      Max.: 255 km/h (158 mph)
      Speed (SP2) Output shaft speed Min.: 0 km/h (0 mph)
      Max.: 255 km/h (158 mph)
    4. Read the freeze frame data of DTC P085D-94.

      Powertrain > Transmission > DTC(P085D-94) > Freeze Frame Data 

      Tester Display
      Vehicle Speed
      Speed (SP2)

      Result

      Result Proceed to
      Vehicle was stopped ("Vehicle Speed" was between 0 and 1.4 km/h (0 and 1 mph)) but "Speed (SP2)" was 3 km/h (2 mph) or more A
      Vehicle was stopped ("Vehicle Speed" was between 0 and 1.4 km/h (0 and 1 mph)) and "Speed (SP2)" was less than 3 km/h (2 mph) B
    5. Turn the engine switch off.

    Result: 

    B 

    REPLACE SHIFT CONTROL ECU. Refer to  REMOVAL [09/2018 - 10/2020]  , or refer to  REMOVAL [10/2020 - 10/2022]  , or refer to  REMOVAL [10/2022 - 10/2023] 

    Result: 

    A 

    See step  3

  3. CHECK VEHICLE TYPE 
    1. Check if the vehicle is equipped with a brake booster assembly.

      Result

      Result Proceed to
      Brake booster assembly equipped A
      Brake booster assembly not equipped B

    Result: 

    B 

    See step  5

    Result: 

    A 

    See step  4

  4. CHECK SPEED SENSOR 

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    REPLACE SHIFT CONTROL ECU. Refer to  REMOVAL [09/2018 - 10/2020]  , or refer to  REMOVAL [10/2020 - 10/2022]  , or refer to  REMOVAL [10/2022 - 10/2023] 

    Result: 

    NG 

    REPAIR OR REPLACE MALFUNCTIONING PARTS 

  5. CHECK SPEED SENSOR 

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    REPLACE SHIFT CONTROL ECU. Refer to  REMOVAL [09/2018 - 10/2020]  , or refer to  REMOVAL [10/2020 - 10/2022]  , or refer to  REMOVAL [10/2022 - 10/2023] 

    Result: 

    NG 

    REPAIR OR REPLACE MALFUNCTIONING PARTS 

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