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Home >> Lexus >> 2024 >> RX 500h >> Repair and Diagnosis >> External Pages >> Different car >> Section 61 (Hybrid Control System - Diagnostic Codes (2 Of 7)) >> HYBRID CONTROL SYSTEM (for PHEV Model) >> DTC P0A30-2A: Drive Motor "B" Temperature Sensor Signal Stuck In Range [08/2023 - ] >> Procedure

DTC P0A30-2A: Drive Motor "B" Temperature Sensor Signal Stuck In Range [08/2023 - ]: Procedure

WARNING: This page is about a different car, the 2025 Lexus RX 450h+ and 2024 Lexus RX 450h+. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK DTC OUTPUT (HYBRID CONTROL) 

    Pre-procedure1

    • None.
    • Check for DTCs.

      Powertrain > Hybrid Control > Trouble Codes 

      Result

      Result Proceed to
      No DTCs are output, or DTCs except the ones in the table below are also output. A
      Any of the following DTCs are also output. B
      Relevant DTC
      P0A30-11 Drive Motor "B" Temperature Sensor Circuit Short to Ground
      P0A30-15 Drive Motor "B" Temperature Sensor Circuit Short to Battery or Open

    Post-procedure1

    • Turn the ignition switch off.

    Result: 

    B 

    GO TO DTC CHART (HYBRID CONTROL SYSTEM). Refer to  DIAGNOSTIC TROUBLE CODE CHART [08/2023 - 10/2024]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2024 - ] 

    Result: 

    A 

    See step  2

  2. CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR) 

    Refer to PROCEDURE - Step 1

    Result

    Result Proceed to
    OK A
    NG (The connector is not connected securely.) B
    NG (The terminals are not making secure contact or are deformed, or water or foreign matter exists in the connector.) C

    Result: 

    B 

    CONNECT SECURELY 

    Result: 

    C 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    A 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (REAR MOTOR TEMPERATURE SENSOR - HYBRID VEHICLE CONTROL ECU) 

    Pre-procedure1

    • Disconnect the hybrid vehicle control ECU connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      C59-48 (RMT) - C59-47 (RMTG) Ignition switch off 0.3 to 2100 kΩ kΩ

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • Reconnect the hybrid vehicle control ECU connector.

    Result: 

    NG 

    See step  10

    Result: 

    OK 

    See step  4

  4. CHECK CONNECTOR CONNECTION CONDITION (NO. 2 FLOOR WIRE CONNECTOR) 

    Refer to PROCEDURE - Step 2

    Result

    Result Proceed to
    OK A
    NG (The connector is not connected securely.) B
    NG (The terminals are not making secure contact or are deformed, or water or foreign matter exists in the connector.) C

    Result: 

    B 

    CONNECT SECURELY 

    Result: 

    C 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    A 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - NO. 2 FLOOR WIRE) 

    Pre-procedure1

    • Disconnect the No. 2 floor wire connector.
    • Disconnect the hybrid vehicle control ECU connector.
    • Measure the resistance according to the value(s) in the table below.

      HINT: 

      When performing the measurement, lightly jiggle the wire harness up and down and left and right and confirm that the resistance does not fluctuate.

      Standard Resistance (Check for Open)

      Tester Connection Condition Specified Condition Result
      CH1-45 - C59-48 (RMT) Ignition switch off Below 1 Ω Ω
      CH1-23 - C59-47 (RMTG) Ignition switch off Below 1 Ω Ω

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition Result
      CH1-45 or C59-48 (RMT) - Body ground and other terminals Ignition switch off 10 kΩ or higher kΩ
      CH1-23 or C59-47 (RMTG) - Body ground and other terminals Ignition switch off 10 kΩ or higher kΩ

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • Reconnect the hybrid vehicle control ECU connector.
    • Reconnect the No. 2 floor wire connector.

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  6

  6. CHECK CONNECTOR CONNECTION CONDITION (FRAME WIRE CONNECTOR) 

    Refer to PROCEDURE - Step 3

    Result

    Result Proceed to
    OK A
    NG (The connector is not connected securely.) B
    NG (The terminals are not making secure contact or are deformed, or water or foreign matter exists in the connector.) C

    Result: 

    B 

    CONNECT SECURELY 

    Result: 

    C 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    A 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (FRAME WIRE - NO. 2 FLOOR WIRE) 

    Pre-procedure1

    • Disconnect the frame wire connector.
    • Disconnect the No. 2 floor wire connector.
    • Measure the resistance according to the value(s) in the table below.

      HINT: 

      When performing the measurement, lightly jiggle the wire harness up and down and left and right and confirm that the resistance does not fluctuate.

      Standard Resistance (Check for Open)

      Tester Connection Condition Specified Condition Result
      CH1-45 - IH3-5 Ignition switch off Below 1 Ω Ω
      CH1-23 - IH3-16 Ignition switch off Below 1 Ω Ω

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition Result
      CH1-45 or IH3-5 - Body ground and other terminals Ignition switch off 10 kΩ or higher kΩ
      CH1-23 or IH3-16 - Body ground and other terminals Ignition switch off 10 kΩ or higher kΩ

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • Reconnect the frame wire connector.
    • Reconnect the No. 2 floor wire connector.

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  8

  8. CHECK CONNECTOR CONNECTION CONDITION (REAR MOTOR TEMPERATURE SENSOR CONNECTOR) 

    Refer to PROCEDURE - Step 10

    Result

    Result Proceed to
    OK A
    NG (The connector is not connected securely.) B
    NG (The terminals are not making secure contact or are deformed, or water or foreign matter exists in the connector.) C

    Result: 

    B 

    CONNECT SECURELY 

    Result: 

    C 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    A 

    See step  9

  9. CHECK HARNESS AND CONNECTOR (REAR MOTOR TEMPERATURE SENSOR - FRAME WIRE) 

    Pre-procedure1

    • Disconnect the frame wire connector.
    • Disconnect the rear motor temperature sensor connector.
    • Measure the resistance according to the value(s) in the table below.

      HINT: 

      When performing the measurement, lightly jiggle the wire harness up and down and left and right and confirm that the resistance does not fluctuate.

      Standard Resistance (Check for Open)

      Tester Connection Condition Specified Condition Result
      I3-2 (RMT) - IH3-5 Ignition switch off Below 1 Ω Ω
      I3-1 (RMTG) - IH3-16 Ignition switch off Below 1 Ω Ω

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition Result
      I3-2 (RMT) -or IH3-5 - Body ground and other terminals Ignition switch off 10 kΩ or higher kΩ
      I3-1 (RMTG) or IH3-16 - Body ground and other terminals Ignition switch off 10 kΩ or higher kΩ

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • Reconnect the rear motor temperature sensor connector.
    • Reconnect the frame wire connector.

    Result: 

    OK 

    REPLACE REAR TRACTION MOTOR WITH TRANSAXLE ASSEMBLY. Refer to  REMOVAL [08/2023 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  10. INSPECT REAR TRACTION MOTOR WITH TRANSAXLE ASSEMBLY (REAR MOTOR TEMPERATURE SENSOR) 

    Pre-procedure1

    • Disconnect the No. 2 floor wire connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      CH1-23 - CH1-45 Ignition switch off 0.3 to 2100 kΩ kΩ

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • Reconnect the No. 2 floor wire connector.

    Result: 

    OK 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (NO. 2 FLOOR WIRE - HYBRID VEHICLE CONTROL ECU) 

    Result: 

    NG 

    See step  11

  11. INSPECT REAR TRACTION MOTOR WITH TRANSAXLE ASSEMBLY (REAR MOTOR TEMPERATURE SENSOR) 

    Pre-procedure1

    • Disconnect the frame wire connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      IH3-5 - IH3-16 Ignition switch off 0.3 to 2100 kΩ kΩ

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • Reconnect the frame wire connector.

    Result: 

    OK 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (FRAME WIRE - NO. 2 FLOOR WIRE) 

    Result: 

    NG 

    See step  12

  12. INSPECT REAR TRACTION MOTOR WITH TRANSAXLE ASSEMBLY (REAR MOTOR TEMPERATURE SENSOR) 

    Refer to PROCEDURE - Step 7

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (REAR MOTOR TEMPERATURE SENSOR - FRAME WIRE) 

    Result: 

    NG 

    REPLACE REAR TRACTION MOTOR WITH TRANSAXLE ASSEMBLY. Refer to  REMOVAL [08/2023 - ] 

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