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Home >> Toyota >> 2020 >> Avalon Limited >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Testing and Diagnosis >> Hybrid Control System (Nickel Metal Hydride) - Diagnostic Codes (P314A-U0424) & Circuit Tests >> HYBRID CONTROL SYSTEM (for NICKEL METAL HYDRIDE BATTERY) >> Circuit Tests >> Transmission Control Switch Circuit [04/2018 - 08/2020] >> Procedure

Transmission Control Switch Circuit [04/2018 - 08/2020]: Procedure

  1. READ VALUE USING TECHSTREAM (SPORTS SHIFT POSITION) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Enter the following menus: Powertrain/Hybrid Control/Data List/Sports Shift Position.

      Powertrain > Hybrid Control > Data List 

      Tester Display
      Sports Shift Position
    4. Read the value displayed on the Techstream.

      Powertrain > Hybrid Control > Data List 

      Tester Display Measurement Item Range Normal Condition
      Sports Shift Position Sports shift position Min.: 0, Max.: 255 Shift lever in S (1): 0
      Shift lever in S (2): 1
      Shift lever in S (3): 2
      Shift lever in S (4): 3
      Shift lever in S (5): 4
      Shift lever in S (6): 5
      Shift lever in any position other than S: 255

      Result

      Result Proceed to
      The Techstream display changes according to the shift lever operation. A
      The Techstream display does not change according to the shift lever operation. B
    5. Turn the power switch off.

    Result: 

    B 

    See step  4

    Result: 

    A 

    See step  2

  2. READ VALUE USING TECHSTREAM (SPORTS SHIFT UP SIGNAL, SPORTS SHIFT DOWN SIGNAL) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Enter the following menus: Powertrain/Hybrid Control/Data List/Sports Shift UP Signal, Sports Shift DOWN Signal.

      Powertrain > Hybrid Control > Data List 

      Tester Display
      Sports Shift UP Signal
      Sports Shift DOWN Signal
    4. Read the value displayed on the Techstream.

      Powertrain > Hybrid Control > Data List 

      Tester Display Measurement Item Range Normal Condition
      Sports Shift UP Signal Operation of "+" transmission control switch. ON or OFF Shift lever held in "+" operated: ON
      Shift lever not operated: OFF
      Sports Shift DOWN Signal Operation of "-" transmission control switch. ON or OFF Shift lever held in "-" operated: ON
      Shift lever not operated: OFF

      Result

      Result Proceed to
      The Techstream display changes according to the transmission control switch (shift lock control unit assembly) operation A
      The Techstream display does not change according to the transmission control switch (shift lock control unit assembly) operation B
    5. Turn the power switch off.

    Result: 

    B 

    See step  7

    Result: 

    A 

    See step  3

  3. CHECK FOR INTERMITTENT PROBLEMS 

    Refer to CHECK FOR INTERMITTENT PROBLEMS [04/2018 - 08/2020]

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    REPLACE HYBRID VEHICLE CONTROL ECU. Refer to  REMOVAL [04/2018 - 08/2021] 

    Result: 

    NG 

    REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA 

  4. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) 
    1. Disconnect the G22 transmission control switch (shift lock control unit assembly) connector.
    2. Turn the power switch on (IG).
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      G22-4 (IG) - Body ground Power switch on (IG) 11 to 14 V
      GTY891156Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Transmission Control Switch (Shift Lock Control Unit Assembly))
    4. Turn the power switch off.
    5. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      G22-4 (IG) - Body ground Power switch off Below 1 V
    6. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G22-2 (E) - Body ground Power switch off Below 1 Ω
    7. Reconnect the G22 transmission control switch (shift lock control unit assembly) connector.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    CHECK POWER SOURCE CIRCUIT 

    Result: 

    OK 

    See step  5

  5. INSPECT TRANSMISSION CONTROL SWITCH (SHIFT LOCK CONTROL UNIT ASSEMBLY) 
    1. Inspect the transmission control switch (shift lock control unit assembly).

      Refer to PROCEDURE - Step 2

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE SHIFT LOCK CONTROL UNIT ASSEMBLY. Refer to  REMOVAL [04/2018 - ] 

    Result: 

    OK 

    See step  6

  6. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - TRANSMISSION CONTROL SWITCH (SHIFT LOCK CONTROL UNIT ASSEMBLY)) 
    1. Disconnect the G47 hybrid vehicle control ECU connector.
      GTY916477Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Rear view of wire harness connector
      (to Hybrid Vehicle Control ECU)
    2. Disconnect the G17 spiral cable sub-assembly connector. (w/ Shift paddle switch)
    3. Turn the power switch on (IG).
    4. Measure the voltage according to the value(s) in the table below when the shift lever is moved to each position.

      Standard Voltage

      Tester Connection Condition Specified Condition
      G47-1 (M) - Body ground Power switch on (IG)
      Shift lever in S, "+" or "-"      		 11 to 14 V
      Power switch on (IG)
      Except shift lever in S, "+" and "-"      		 Below 1 V
      NOTE:

      If the power switch is turned on (IG) with the hybrid vehicle control ECU connector disconnected, other DTCs will be stored. After performing the inspection, clear the DTCs.

    5. Turn the power switch off.
    6. Measure the resistance according to the value(s) in the table below when the shift lever is moved to each position.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G47-9 (SFTU) - Body ground Shift lever held in "+" Below 13 Ω
      G47-9 (SFTU) - Body ground Shift lever not operated 10 kΩ or higher
      G47-8 (SFTD) - Body ground Shift lever held in "-" Below 13 Ω
      G47-8 (SFTD) - Body ground Shift lever not operated 10 kΩ or higher
    7. Reconnect the G17 spiral cable sub-assembly connector. (w/ Shift paddle switch)
    8. Reconnect the G47 hybrid vehicle control ECU connector.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE HYBRID VEHICLE CONTROL ECU. Refer to  REMOVAL [04/2018 - 08/2021] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  7. INSPECT TRANSMISSION CONTROL SWITCH (SHIFT LOCK CONTROL UNIT ASSEMBLY) 
    1. Disconnect the G22 transmission control switch (shift lock control unit assembly) connector.
    2. Measure the resistance according to the value(s) in the table below when the shift lever is moved to each position.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G22-3 (SFTU) - G22-2 (E) Shift lever held in "+" Below 13 Ω
      G22-3 (SFTU) - G22-2 (E) Shift lever not operated 10 kΩ or higher
      G22-1 (SFTD) - G22-2 (E) Shift lever held in "-" Below 13 Ω
      G22-1 (SFTD) - G22-2 (E) Shift lever not operated 10 kΩ or higher
      GTY913935Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (to Transmission Control Switch (Shift Lock Control Unit Assembly))
    3. Reconnect the G22 transmission control switch (shift lock control unit assembly) connector.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE SHIFT LOCK CONTROL UNIT ASSEMBLY. Refer to  REMOVAL [04/2018 - ] 

    Result: 

    OK 

    See step  8

  8. CHECK HARNESS AND CONNECTOR (TRANSMISSION CONTROL SWITCH (SHIFT LOCK CONTROL UNIT ASSEMBLY) - HYBRID VEHICLE CONTROL ECU) 
    1. Disconnect the G47 hybrid vehicle control ECU connector.
    2. Disconnect the G17 spiral cable sub-assembly connector. (w/ Shift paddle switch)
    3. Measure the resistance according to the value(s) in the table below when the shift lever is moved to each position.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G47-9 (SFTU) - Body ground Shift lever held in "+" Below 13 Ω
      Shift lever not operated 10 kΩ or higher
      G47-8 (SFTD) - Body ground Shift lever held in "-" Below 13 Ω
      Shift lever not operated 10 kΩ or higher
      GTY916476Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Rear view of wire harness connector
      (to Hybrid Vehicle Control ECU)
    4. Reconnect the G17 spiral cable sub-assembly connector. (w/ Shift paddle switch)
    5. Reconnect the G47 hybrid vehicle control ECU connector.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE HYBRID VEHICLE CONTROL ECU. Refer to  REMOVAL [04/2018 - 08/2021] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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