LEMON Manuals: Even more car manuals for everyone
Home >> Lexus >> 2019 >> LC 500h >> Repair and Diagnosis (Single Page) >> Transmission >> Transmission Control Systems >> Electronic A/T Shift Lever System - Diagnostic Codes (1 Of 4) >> Electronic Shift Lever System >> DTC P085D-94: Gear Shift Control Module "A" Unexpected Operation [01/2017 - 05/2023] >> Procedure

DTC P085D-94: Gear Shift Control Module "A" Unexpected Operation [01/2017 - 05/2023]: Procedure

  1. CHECK DTC OUTPUT (HYBRID CONTROL) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

      Powertrain > Hybrid Control > 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 P0A3F-16 Drive Motor "A" Position Sensor Circuit Voltage Below Threshold
      P0A3F-21 Drive Motor "A" Position Sensor Signal Amplitude < Minimum
      P0A3F-22 Drive Motor "A" Position Sensor Signal Amplitude > Maximum
      3 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

      HINT: 

      The chart above is listed in inspection order of priority.

    5. Turn the power 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 power switch on (IG).
    3. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

      Powertrain > Hybrid Control > Trouble Codes 

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

      Powertrain > Hybrid Control 

      Tester Display
      Vehicle Speed
      Calculated Vehicle Speed (Transmission)

      Result

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

    Result: 

    REPLACE SHIFT CONTROL ECU. Refer to  REMOVAL [01/2017 - 05/2023] 

    Result: 

    See step  3

  3. CHECK MOTOR RESOLVER CIRCUIT 

    Refer to Motor Resolver Circuit [01/2017 - 05/2023]

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    REPLACE SHIFT CONTROL ECU. Refer to  REMOVAL [01/2017 - 05/2023] 

    Result: 

    NG 

    REPAIR OR REPLACE MALFUNCTIONING PARTS