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Home >> Lexus >> 2018 >> LC 500 >> Repair and Diagnosis (Single Page) >> Transmission >> Transmission Control Systems >> Electronic A/T Shift Lever System - Diagnostic Codes (Coupe) (1 Of 6) >> Electronic Shift Lever System >> DTC P085D-94: Gear Shift Control Module "A" Unexpected Operation [03/2017 - 05/2023] >> Procedure

DTC P085D-94: Gear Shift Control Module "A" Unexpected Operation [03/2017 - 05/2023]: 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
      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: 

    GO TO DTC CHART 

    Result: 

    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.

      Powertrain > Transmission > Trouble Codes 

    4. Read the freeze frame data of DTC P085D-94.

      Powertrain > Transmission 

      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: 

    REPLACE SHIFT CONTROL ECU. Refer to  REMOVAL [03/2017 - 05/2023] 

    Result: 

    See step  3

  3. CHECK SPEED SENSOR 

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    REPLACE SHIFT CONTROL ECU. Refer to  REMOVAL [03/2017 - 05/2023] 

    Result: 

    NG 

    REPAIR OR REPLACE MALFUNCTIONING PARTS