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Home >> Lexus >> 2024 >> RX 500h >> Repair and Diagnosis >> External Pages >> Different car >> Section 124 (Automatic Transaxle System - Diagnostic Codes (2 Of 3)) >> Automatic Transaxle System >> DTC P1703-00: AT Solenoid Output Malfunction [10/2022 - ] >> Procedure

DTC P1703-00: AT Solenoid Output Malfunction [10/2022 - ]: Procedure

WARNING: This page is about a different car, the 2025 Lexus RX 350, 2024 Lexus RX 350, and 2023 Lexus RX 350. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE (SOLENOID VALVE) - ECM) 

    Pre-procedure1

    1. Disconnect the B29 ECM connector.

      Procedure1

    2. Measure the resistance according to the value (s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      B29-33 (SL1+) - B29-34 (SL1-) 20°C (68°F) 5.0 to 5.6 Ω
      B29-31 (SL2+) - B29-32 (SL2-) 20°C (68°F) 5.0 to 5.6 Ω
      B29-19 (SL3+) - B29-20 (SL3-) 20°C (68°F) 5.0 to 5.6 Ω
      B29-29 (SL4+) - B29-30 (SL4-) 20°C (68°F) 5.0 to 5.6 Ω
      B29-17 (SL5+) - B29-18 (SL5-) 20°C (68°F) 5.0 to 5.6 Ω
      B29-28 (SL6+) - B29-27 (SL6-) 20°C (68°F) 5.0 to 5.6 Ω
      B29-35 (SLU+) - B29-36 (SLU-) 20°C (68°F) 5.0 to 5.6 Ω
      B29-42 (SL) - Body ground 20°C (68°F) 11 to 15 Ω
      B29-33 (SL1+) or B29-34 (SL1-) - Body ground and other terminals Always 10 kΩ or higher
      B29-31 (SL2+) or B29-32 (SL2-) - Body ground and other terminals Always 10 kΩ or higher
      B29-19 (SL3+) or B29-20 (SL3-) - Body ground and other terminals Always 10 kΩ or higher
      B29-29 (SL4+) or B29-30 (SL4-) - Body ground and other terminals Always 10 kΩ or higher
      B29-17 (SL5+) or B29-18 (SL5-) - Body ground and other terminals Always 10 kΩ or higher
      B29-28 (SL6+) or B29-27 (SL6-) - Body ground and other terminals Always 10 kΩ or higher
      B29-35 (SLU+) or B29-36 (SLU-) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    3. None

    Result: 

    NG 

    See step  10

    Result: 

    OK 

    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  6

    Result: 

    A 

    See step  3

  3. CLEAR DTC 

    Pre-procedure1

    1. None

      Procedure1

    2. Clear the DTCs.

      Powertrain > Transmission > Clear DTCs 

      Result

      Proceed to
      NEXT

      Post-procedure1

    3. Turn the ignition switch off and wait for 30 seconds or more.

    Result: 

    NEXT 

    See step  4

  4. READ OUTPUT DTC 

    Pre-procedure1

    1. Perform the D Position Shift Test inspection in Road Test.

      HINT: 

      Refer to ROAD TEST [10/2022 - ]

      Procedure1

    2. Read the DTCs using the GTS.

      Powertrain > Transmission > Trouble Codes 

      Result

      Result Proceed to
      DTCs are not output A
      P1703-00 is output B

      Post-procedure1

    3. None

    Result: 

    A 

    END 

    Result: 

    B 

    See step  5

  5. REPLACE ECM 

    HINT: 

    Refer to REMOVAL [10/2022 - ]

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    PERFORM REGISTRATION. Refer to  REGISTRATION [10/2022 - ] 

  6. INSPECT TRANSMISSION REVOLUTION SENSOR (NC) (NC TERMINAL) 

    Pre-procedure1

    1. Disconnect the B25 transmission wire connector.

      Procedure1

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      B25-21 (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
      B25-22 (NCB) - Body ground Ignition switch ON 11 to 14 V

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    5. None

    Result: 

    NG 

    See step  8

    Result: 

    OK 

    See step  7

  7. INSPECT TRANSMISSION WIRE (TRANSMISSION REVOLUTION SENSOR (NC)) 

    Pre-procedure1

    1. Disconnect the transmission revolution sensor (NC) connector.

      HINT: 

      Refer to REMOVAL [10/2022 - ]

    2. Disconnect the B25 transmission wire connector.

      Procedure1

    3. Measure the resistance according to the value(s) in the table below.
      GTY1122590Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Transmission Wire
      *a Transmission Revolution Sensor (NC) Side
      *b Wire Harness Connector Side

      Standard Resistance

      Tester Connection Condition Specified Condition
      1 (transmission revolution sensor (NC) side) - B25-22 (NCB) Always Below 1 Ω
      2 (transmission revolution sensor (NC) side) - B25-21 (NCO) Always Below 1 Ω
      1 (transmission revolution sensor (NC) side) or B25-22 (NCB) - Body ground Always 10 kΩ or higher
      2 (transmission revolution sensor (NC) side) or B25-21 (NCO) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    4. None

    Result: 

    OK 

    REPLACE TRANSMISSION REVOLUTION SENSOR (NC). Refer to  REMOVAL [10/2022 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE TRANSMISSION WIRE. Refer to  REMOVAL [10/2022 - ] 

  8. CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM) 

    Pre-procedure1

    1. Disconnect the B25 transmission wire connector.
    2. Disconnect the B29 ECM connector.

      Procedure1

    3. Measure the resistance according to the value (s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      B25-22 (NCB) - B29-52 (NCB) Always Below 1 Ω
      B25-21 (NCO) - B29-51 (NCO) Always Below 1 Ω
      B25-22 (NCB) or B29-52 (NCB) - Body ground Always 10 kΩ or higher
      B25-21 (NCO) or B29-51 (NCO) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    4. None

    Result: 

    NG 

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

    Result: 

    OK 

    See step  9

  9. REPLACE ECM 

    HINT: 

    Refer to REMOVAL [10/2022 - ]

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    PERFORM REGISTRATION. Refer to  REGISTRATION [10/2022 - ] 

  10. CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM) 

    Pre-procedure1

    1. Disconnect the B25 transmission wire connector.
    2. Disconnect the B29 ECM connector.

      Procedure1

    3. Measure the resistance according to the value (s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      B25-17 (SL1+) - B29-33 (SL1+) Always Below 1 Ω
      B25-16 (SL1-) - B29-34 (SL1-) Always Below 1 Ω
      B25-19 (SL2+) - B29-31 (SL2+) Always Below 1 Ω
      B25-18 (SL2-) - B29-32 (SL2-) Always Below 1 Ω
      B25-7 (SL3+) - B29-19 (SL3+) Always Below 1 Ω
      B25-6 (SL3-) - B29-20 (SL3-) Always Below 1 Ω
      B25-15 (SL4+) - B29-29 (SL4+) Always Below 1 Ω
      B25-14 (SL4-) - B29-30 (SL4-) Always Below 1 Ω
      B25-26 (SL5+) - B29-17 (SL5+) Always Below 1 Ω
      B25-25 (SL5-) - B29-18 (SL5-) Always Below 1 Ω
      B25-9 (SL6+) - B29-28 (SL6+) Always Below 1 Ω
      B25-8 (SL6-) - B29-27 (SL6-) Always Below 1 Ω
      B25-5 (SLU+) - B29-35 (SLU+) Always Below 1 Ω
      B25-4 (SLU-) - B29-36 (SLU-) Always Below 1 Ω
      B25-13 (SL) - B29-42 (SL) Always Below 1 Ω
      B25-17 (SL1+) or B29-33 (SL1+) - Body ground and other terminals Always 10 kΩ or higher
      B25-16 (SL1-) or B29-34 (SL1-) - Body ground and other terminals Always 10 kΩ or higher
      B25-19 (SL2+) or B29-31 (SL2+) - Body ground and other terminals Always 10 kΩ or higher
      B25-18 (SL2-) or B29-32 (SL2-) - Body ground and other terminals Always 10 kΩ or higher
      B25-7 (SL3+) or B29-19 (SL3+) - Body ground and other terminals Always 10 kΩ or higher
      B25-6 (SL3-) or B29-20 (SL3-) - Body ground and other terminals Always 10 kΩ or higher
      B25-15 (SL4+) or B29-29 (SL4+) - Body ground and other terminals Always 10 kΩ or higher
      B25-14 (SL4-) or B29-30 (SL4-) - Body ground and other terminals Always 10 kΩ or higher
      B25-26 (SL5+) or B29-17 (SL5+) - Body ground and other terminals Always 10 kΩ or higher
      B25-25 (SL5-) or B29-18 (SL5-) - Body ground and other terminals Always 10 kΩ or higher
      B25-9 (SL6+) or B29-28 (SL6+) - Body ground and other terminals Always 10 kΩ or higher
      B25-8 (SL6-) or B29-27 (SL6-) - Body ground and other terminals Always 10 kΩ or higher
      B25-5 (SLU+) or B29-35 (SLU+) - Body ground and other terminals Always 10 kΩ or higher
      B25-4 (SLU-) or B29-36 (SLU-) - Body ground and other terminals Always 10 kΩ or higher
      B25-13 (SL) or B29-42 (SL) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    4. None

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  11

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

    Refer to INSPECTION [10/2022 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    REPAIR OR REPLACE TRANSMISSION WIRE. Refer to  REMOVAL [10/2022 - ] 

    Result: 

    NG 

    REPLACE SOLENOID (SL1), (SL2), (SL3), (SL4), (SL5), (SL6), (SLU) OR (SL) VALVE. Refer to  DISASSEMBLY [10/2022 - ] 

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