LEMON Manuals: Even more car manuals for everyone
Home >> Lexus >> 2024 >> NX 250 FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 149 (Automatic Transaxle System - Diagnostic Codes (2 Of 3)) >> Automatic Transaxle System >> DTC P1702-9F: AT Solenoids Operation Shutdown Circuit Stuck Off [11/2021 - ] >> Procedure

DTC P1702-9F: AT Solenoids Operation Shutdown Circuit Stuck Off [11/2021 - ]: Procedure

WARNING: This page is about a different car, the 2025 Lexus NX 350, 2024 Lexus NX 350, 2023 Lexus NX 350, and 2022 Lexus NX 350. However, it is still accessible from the selected car via links, so may be relevant.
  1. READ VALUE USING GTS 
    1. Read the Data List according to the display on the GTS.

      Powertrain > Transmission > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      NT Sensor Speed Input shaft speed Min.: 0 rpm
      Max.: 12750 rpm
      • Equal to engine speed: Lock-up on (after warming up engine)
      • Nearly equal to engine speed: Lock-up off (idling with shift state neutral (N))
      		 Data is displayed in increments of 50 rpm
      NT Sensor Voltage NT sensor voltage Min.: 0.000 V
      Max.: 4.999 V      		 0.1 to 1.9 V: Engine idling -

      Powertrain > Transmission > Data List 

      Tester Display
      NT Sensor Speed
      NT Sensor Voltage

      Result

      Result Proceed to
      Data List values are normal A
      Data List values are not normal B

    Result: 

    B 

    See step  12

    Result: 

    A 

    See step  2

  2. READ VALUE USING GTS (NC SENSOR SPEED AND NC SENSOR VOLTAGE) 
    1. Read the Data List according to the display on the GTS.

      Powertrain > Transmission > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      NC Sensor Speed Counter gear speed Min.: 0 rpm
      Max.: 12750 rpm      		 - -
      NC Sensor Voltage NC sensor voltage Min.: 0.000 V
      Max.: 4.999 V      		 0.1 to 1.9 V: Engine idling -

      Powertrain > Transmission > Data List 

      Tester Display
      NC Sensor Speed
      NC Sensor Voltage

      Result

      Result Proceed to
      Data List values are normal A
      Data List values are not normal B

    Result: 

    B 

    See step  8

    Result: 

    A 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE (SOLENOID VALVE) - ECM) 
    1. Disconnect the B51 ECM connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      B51-33 (SL1+) - B51-34 (SL1-) 20°C (68°F) 5.0 to 5.6 Ω
      B51-31 (SL2+) - B51-32 (SL2-) 20°C (68°F) 5.0 to 5.6 Ω
      B51-19 (SL3+) - B51-20 (SL3-) 20°C (68°F) 5.0 to 5.6 Ω
      B51-29 (SL4+) - B51-30 (SL4-) 20°C (68°F) 5.0 to 5.6 Ω
      B51-17 (SL5+) - B51-18 (SL5-) 20°C (68°F) 5.0 to 5.6 Ω
      B51-28 (SL6+) - B51-27 (SL6-) 20°C (68°F) 5.0 to 5.6 Ω
      B51-26 (SLT+) - B51-25 (SLT-) 20°C (68°F) 5.0 to 5.6 Ω
      B51-35 (SLU+) - B51-36 (SLU-) 20°C (68°F) 5.0 to 5.6 Ω
      B51-42 (SL) - Body ground 20°C (68°F) 11 to 15 Ω
      B51-33 (SL1+) or B51-34 (SL1-) - Body ground and other terminals Always 10 kΩ or higher
      B51-31 (SL2+) or B51-32 (SL2-) - Body ground and other terminals Always 10 kΩ or higher
      B51-19 (SL3+) or B51-20 (SL3-) - Body ground and other terminals Always 10 kΩ or higher
      B51-29 (SL4+) or B51-30 (SL4-) - Body ground and other terminals Always 10 kΩ or higher
      B51-17 (SL5+) or B51-18 (SL5-) - Body ground and other terminals Always 10 kΩ or higher
      B51-28 (SL6+) or B51-27 (SL6-) - Body ground and other terminals Always 10 kΩ or higher
      B51-26 (SLT+) or B51-25 (SLT-) - Body ground and other terminals Always 10 kΩ or higher
      B51-35 (SLU+) or B51-36 (SLU-) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  6

    Result: 

    OK 

    See step  4

  4. CHECK ECM POWER SOURCE CIRCUIT 

    Refer to ECM Power Source Circuit [11/2021 - ]

    HINT: 

    Check the ECM power source circuit, and proceed to the next step if no malfunction is recognized.

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  5

  5. REPLACE ECM 

    Refer to REMOVAL [11/2021 - ]

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    PERFORM REGISTRATION. Refer to  REGISTRATION [11/2021 - ] 

  6. CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM) 
    1. Disconnect the B39 transmission wire connector.
    2. Disconnect the B51 ECM connector.
    3. Measure the resistance according to the value (s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      B39-17 (SL1+) - B51-33 (SL1+) Always Below 1 Ω
      B39-16 (SL1-) - B51-34 (SL1-) Always Below 1 Ω
      B39-19 (SL2+) - B51-31 (SL2+) Always Below 1 Ω
      B39-18 (SL2-) - B51-32 (SL2-) Always Below 1 Ω
      B39-7 (SL3+) - B51-19 (SL3+) Always Below 1 Ω
      B39-6 (SL3-) - B51-20 (SL3-) Always Below 1 Ω
      B39-15 (SL4+) - B51-29 (SL4+) Always Below 1 Ω
      B39-14 (SL4-) - B51-30 (SL4-) Always Below 1 Ω
      B39-26 (SL5+) - B51-17 (SL5+) Always Below 1 Ω
      B39-25 (SL5-) - B51-18 (SL5-) Always Below 1 Ω
      B39-9 (SL6+) - B51-28 (SL6+) Always Below 1 Ω
      B39-8 (SL6-) - B51-27 (SL6-) Always Below 1 Ω
      B39-24 (SLT+) - B51-26 (SLT+) Always Below 1 Ω
      B39-23 (SLT-) - B51-25 (SLT-) Always Below 1 Ω
      B39-5 (SLU+) - B51-35 (SLU+) Always Below 1 Ω
      B39-4 (SLU-) - B51-36 (SLU-) Always Below 1 Ω
      B39-13 (SL) - B51-42 (SL) Always Below 1 Ω
      B39-17 (SL1+) or B51-33 (SL1+) - Body ground and other terminals Always 10 kΩ or higher
      B39-16 (SL1-) or B51-34 (SL1-) - Body ground and other terminals Always 10 kΩ or higher
      B39-19 (SL2+) or B51-31 (SL2+) - Body ground and other terminals Always 10 kΩ or higher
      B39-18 (SL2-) or B51-32 (SL2-) - Body ground and other terminals Always 10 kΩ or higher
      B39-7 (SL3+) or B51-19 (SL3+) - Body ground and other terminals Always 10 kΩ or higher
      B39-6 (SL3-) or B51-20 (SL3-) - Body ground and other terminals Always 10 kΩ or higher
      B39-15 (SL4+) or B51-29 (SL4+) - Body ground and other terminals Always 10 kΩ or higher
      B39-14 (SL4-) or B51-30 (SL4-) - Body ground and other terminals Always 10 kΩ or higher
      B39-26 (SL5+) or B51-17 (SL5+) - Body ground and other terminals Always 10 kΩ or higher
      B39-25 (SL5-) or B51-18 (SL5-) - Body ground and other terminals Always 10 kΩ or higher
      B39-9 (SL6+) or B51-28 (SL6+) - Body ground and other terminals Always 10 kΩ or higher
      B39-8 (SL6-) or B51-27 (SL6-) - Body ground and other terminals Always 10 kΩ or higher
      B39-24 (SLT+) or B51-26 (SLT+) - Body ground and other terminals Always 10 kΩ or higher
      B39-23 (SLT-) or B51-25 (SLT-) - Body ground and other terminals Always 10 kΩ or higher
      B39-5 (SLU+) or B51-35 (SLU+) - Body ground and other terminals Always 10 kΩ or higher
      B39-4 (SLU-) or B51-36 (SLU-) - Body ground and other terminals Always 10 kΩ or higher
      B39-13 (SL) or B51-42 (SL) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  7

  7. INSPECT SOLENOID (SL1), (SL2), (SL3), (SL4), (SL5), (SL6), (SLT), (SLU) AND (SL) VALVE 

    Refer to INSPECTION [11/2021 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    REPAIR OR REPLACE TRANSMISSION WIRE. Refer to  REMOVAL [11/2021 - ] 

    Result: 

    NG 

    REPLACE SOLENOID (SL1), (SL2), (SL3), (SL4), (SL5), (SL6), (SLT), (SLU) OR (SL) VALVE. Refer to  DISASSEMBLY [11/2021 - ] 

  8. INSPECT TRANSMISSION REVOLUTION SENSOR (NC) (NC TERMINAL) 
    1. Disconnect the B39 transmission wire connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      B39-21 (NCO) - Body ground Always 99 to 101 Ω
    3. Turn the ignition switch to ON.
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      B39-22 (NCB) - Body ground Ignition switch ON 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  10

    Result: 

    OK 

    See step  9

  9. INSPECT TRANSMISSION WIRE (TRANSMISSION REVOLUTION SENSOR (NC)) 
    1. Disconnect the transmission revolution sensor (NC) connector.
      GTY1059080Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Transmission Wire
      *a Transmission Revolution Sensor (NC) Side
      *b Wire Harness Connector Side

      Refer to REMOVAL [11/2021 - ]

    2. Disconnect the B39 transmission wire connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      1 (transmission revolution sensor (NC) side) - B39-22 (NCB) Always Below 1 Ω
      2 (transmission revolution sensor (NC) side) - B39-21 (NCO) Always Below 1 Ω
      1 (transmission revolution sensor (NC) side) or B39-22 (NCB) - Body ground Always 10 kΩ or higher
      2 (transmission revolution sensor (NC) side) or B39-21 (NCO) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE TRANSMISSION REVOLUTION SENSOR (NC). Refer to  REMOVAL [11/2021 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE TRANSMISSION WIRE. Refer to  REMOVAL [11/2021 - ] 

  10. CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM) 
    1. Disconnect the B39 transmission wire connector.
    2. Disconnect the B51 ECM connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      B39-22 (NCB) - B51-52 (NCB) Always Below 1 Ω
      B39-21 (NCO) - B51-51 (NCO) Always Below 1 Ω
      B39-22 (NCB) or B51-52 (NCB) - Body ground Always 10 kΩ or higher
      B39-21 (NCO) or B51-51 (NCO) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (TRANSMISSION WIRE - ECM) 

    Result: 

    OK 

    See step  11

  11. REPLACE ECM 

    Refer to REMOVAL [11/2021 - ]

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    PERFORM REGISTRATION. Refer to  REGISTRATION [11/2021 - ] 

  12. INSPECT TRANSMISSION REVOLUTION SENSOR (NT) 
    1. Disconnect the B39 transmission wire connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      B39-11 (NTO) - Body ground Always 99 to 101 Ω
    3. Turn the ignition switch to ON.
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      B39-12 (NTB) - Body ground Ignition switch ON 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  14

    Result: 

    OK 

    See step  13

  13. INSPECT TRANSMISSION WIRE (TRANSMISSION REVOLUTION SENSOR (NT)) 
    1. Disconnect the transmission revolution sensor (NT) connector.
      GTY1059081Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Transmission Wire
      *a Transmission Revolution Sensor (NT) Side
      *b Wire Harness Connector Side

      Refer to REMOVAL [11/2021 - ]

    2. Disconnect the B39 transmission wire connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      1 (transmission revolution sensor (NT) side) - B39-12 (NTB) Always Below 1 Ω
      2 (transmission revolution sensor (NT) side) - B39-11 (NTO) Always Below 1 Ω
      1 (transmission revolution sensor (NT) side) or B39-12 (NTB) - Body ground and other terminals Always 10 kΩ or higher
      2 (transmission revolution sensor (NT) side) or B39-11 (NTO) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE TRANSMISSION REVOLUTION SENSOR (NT). Refer to  REMOVAL [11/2021 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE TRANSMISSION WIRE. Refer to  REMOVAL [11/2021 - ] 

  14. CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM) 
    1. Disconnect the B39 transmission wire connector.
    2. Disconnect the B51 ECM connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      B39-12 (NTB) - B51-54 (NTB) Always Below 1 Ω
      B39-11 (NTO) - B51-53 (NTO) Always Below 1 Ω
      B39-12 (NTB) or B51-54 (NTB) - Body ground and other terminals Always 10 kΩ or higher
      B39-11 (NTO) or B51-53 (NTO) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (TRANSMISSION WIRE - ECM) 

    Result: 

    OK 

    See step  15

  15. REPLACE ECM 

    Refer to REMOVAL [11/2021 - ]

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    PERFORM REGISTRATION. Refer to  REGISTRATION [11/2021 - ] 

scientia non olet · About LEMON Manuals