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Home >> Lexus >> 2019 >> LC 500h >> Repair and Diagnosis >> Transmission >> Transmission Control Systems >> Electronic A/T Shift Lever System - Diagnostics - Introduction >> Electronic Shift Lever System >> System Description [01/2017 - 04/2020] >> System Description [01/2017 - 04/2020]
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System Description [01/2017 - 04/2020]

  1. SYSTEM DESCRIPTION 

    The electronic shift lever system electrically controls the transmission parking lock mechanism and shift control mechanism.

    The shift control ECU judges the vehicle condition based on the information from each sensor, switch and ECU and performs appropriate shift control based on the driver's operation of the shift lever or P position switch.

    If a malfunction occurs in the electronic shift lever system, the master warning light illuminates in the combination meter assembly (according to the malfunction mode, the shift position indicator (P, R, N, D, M) turns off (not in all cases)) and a warning message is also displayed on the multi-information display.

    When the shift control ECU detects a malfunction, the DTC is stored in the hybrid vehicle control ECU.

  2. SHIFT POSITION INDICATOR CONTROL 
    1. Shift position indicator (P, R, N, D, M) ON (indicator illuminated (normal)) or OFF (indicator off (not normal)) is displayed.
      SHIFT POSITION INDICATOR

      DTC No. Indicator Suspected Cause
      P0850-11 Normal P switch malfunction (Low)
      P0850-15 Normal P switch malfunction (High)
      P085D-46 Normal Data flash malfunction
      P085D-94 May turn off Shift control ECU system monitoring malfunction
      P08A6-00 Normal Shift lever position sensor malfunction (Pattern malfunction 2)
      P08A6-62 Normal Shift lever position sensor malfunction (Pattern malfunction)
      P1760-87 Normal 2nd battery signal reception stop
      P1761-A2 Normal Main power supply (Open)
      P1765-A2 May turn off 2nd battery (Low malfunction)
      P1769-49 Goes off AD convertor (3) (AD time out) malfunction
      P176A-87 Normal SBFS communication (Reception stop)
      P176B-9F Normal SBFS circuit malfunction
      P176C-62 Normal Range sensor deviation malfunction (Deviation malfunction)
      P176D-12 Normal Start trigger (High malfunction)
      P1834-11 Normal Shift lever position sensor 1 malfunction (Low)
      P1834-15 Normal Shift lever position sensor 1 malfunction (High)
      P183A-11 Normal Shift lever position sensor 2 malfunction (Low)
      P183A-15 Normal Shift lever position sensor 2 malfunction (High)
      P183F-12 Normal Shift lever position sensor 3 malfunction (High)
      P183F-14 Normal Shift lever position sensor 3 malfunction (Low)
      P1845-12 Normal Shift lever position sensor 4 malfunction (High)
      P1845-14 Normal Shift lever position sensor 4 malfunction (Low)
      P1C89-49 Goes off Park pawl motor control system (Initially drive) internal electronic failure
      P1C8A-49 Goes off Park pawl motor control system (Learning value of shift immovable scope) internal electronic failure
      P1C8B-49 Goes off Park pawl motor control system (Switching control lock/unlock) internal electronic failure
      P1C8C-49 Goes off Park pawl motor control system (Lock/unlock position learning) internal electronic failure
      P1C8D-49 Goes off Park pawl motor control system (After lock/unlock position learning) internal electronic failure
      P1C8E-49 Goes off Park pawl motor control system (Driving request) internal electronic failure
      P1C8F-14 May turn off U phase open/GND short malfunction
      P1C94-14 May turn off V phase open/GND short malfunction
      P1C99-14 May turn off W phase open/GND short malfunction
      P271A-11 Normal Range sensor signal 1 (Low malfunction)
      P271A-15 Normal Range sensor signal 1 (High malfunction)
      P271C-11 Normal Range sensor signal 2 (Low malfunction)
      P271C-15 Normal Range sensor signal 2 (High malfunction)
      P272C-00 Goes off Park pawl motor driving time too long
      P272C-73 Normal +B relay short malfunction
      U0103-87 Goes off Shift control ECU communication lost
      U0140-00 Normal CAN communication (Powertrain bus) (CAN communication malfunction with main body ECU (multiplex network body ECU)) (Communication lost)
      U0293-00 Normal CAN communication (Powertrain bus) (CAN communication malfunction with hybrid vehicle control ECU) (Communication lost)
      U1107-00 Normal CAN communication (Powertrain bus) (CAN communication malfunction with certification ECU (Smart Key ECU Assembly)) (Communication lost)
      U1170-00 Normal CAN communication (Powertrain bus) (CAN communication malfunction with skid control ECU) (Communication lost)
  3. REJECT FUNCTION 
    1. A reject function is equipped to reject incorrect shift switching when the shift lever is operated incorrectly.
    2. When the reject function operates, the current shift state is maintained or switches to the neutral (N). The buzzer in the combination meter assembly sounds (2 times consecutively or once) and the master warning light blinks. Also, the recommended handling method is displayed on the multi-information display.
      REJECT FUNCTION OPERATION CHART

      Shift operation performed by reject function Shift state after reject function operation Message displayed on multi-information display
      Changes the shift state when auxiliary battery voltage was low Maintains current shift state Battery low
      Shifting unavailable
      See owner's Service Information
      Changes the shift state to and from park (P) within a short period of time Park (P) Shifting unavailable
      Wait a moment and
      Shift again
      Changes the shift state from park (P) or neutral (N) to manual (M) Maintains current shift state Vehicle must be in D
      to shift into M
      • Changes the shift state to drive (D), reverse (R) or manual (M) when the power switch is on (IG) and the READY indicator is off
      • Changes the shift state from park (P) when the READY indicator is blinking or the engine is cranking
      • Changes the shift state from park (P) when the required voltage to change the shift state is not available
      		 Park (P) Hybrid system must be READY
      to shift
      Changes the shift state from park (P) with brake pedal not depressed Park (P) Depress brake to shift
      Changes the shift state directly to manual (M) from reverse (R) Neutral (N) Shifted into N
      Vehicle must be in D
      to shift into M
      Changes the shift state to drive (D) while backing up Neutral (N) Shifted into N
      Vehicle must be stopped
      to shift into D
      Changes the shift state to reverse (R) while driving forward Neutral (N) Shifted into N
      Vehicle must be stopped
      to shift into R
      Changes the shift state to park (P) when driving Maintains current shift state -
      Changes the shift state form park (P) when accelerator and brake pedals depressed simultaneously Park (P) Release accelerator to shift
      Changes the shift state to neutral (N) when the system detects the shift lever was moved to N but not enough time elapsed for manual switching Maintains current shift state* Temporarily hold shift lever
      in N position
      to shift into N

      *: The shift state may shift to neutral (N) depending on the driving conditions.

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