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Home >> Lexus >> 2024 >> RX 500h >> Repair and Diagnosis >> External Pages >> Different car >> Section 108 (Hybrid Battery System - Diagnostic Codes (3 Of 5)) >> HYBRID BATTERY SYSTEM (for PHEV Model) >> DTC P19CF-62: Hybrid/EV Battery Pack Coolant Temperature Sensor System Signal Compare Failure [08/2023 - ] >> Procedure

DTC P19CF-62: Hybrid/EV Battery Pack Coolant Temperature Sensor System Signal Compare Failure [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 (HV BATTERY) 
    1. Check for DTCs.

      Powertrain > HV Battery > Trouble Codes 

      Result

      Result Proceed to
      "P19CF-62" only is output. A
      DTCs except "P19CF-62" of hybrid battery system are output. B

    Result: 

    B 

    GO TO DTC CHART (HYBRID BATTERY SYSTEM). Refer to  DIAGNOSTIC TROUBLE CODE CHART [08/2023 - ] 

    Result: 

    A 

    See step  2

  2. CHECK CONNECTOR CONNECTION CONDITION (BATTERY ECU ASSEMBLY) 

    HINT: 

    Refer to PROCEDURE - Step 2

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    CONNECT SECURELY 

    Result: 

    OK 

    See step  3

  3. CHECK NO. 1 AIR CONDITIONING THERMISTOR ASSEMBLY (DUCT INLET 1, DUCT INLET 2) 
    WARNING:

    Be sure to wear insulated gloves and protective goggles.

    Pre-procedure1

    • Check that the service plug grip is not installed.
      NOTE:

      After removing the service plug grip, do not turn the ignition switch to ON (READY), unless instructed by the appropriate service information because this may cause a malfunction.

    • Connect the SST.

      HINT: 

      Refer to Instructions for Connecting SST [08/2023 - ]

    • Disconnect the battery ECU assembly connector.
      GTY1204780Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE:

      Before disconnecting the connector, check that it is not loose or disconnected.

    • Measure the resistance of the circuit for the malfunctioning sensor.

      Tester Connection

      Tester Connection No. 1 Air Conditioning Thermistor Assembly
      o4-1 (TRF0) - o4-2 (GRF0) Duct Inlet 1
      o4-19 (TRF2) - o4-20 (GRF2) Duct Inlet 2

      Standard Resistance

      Thermistor Temperature Condition Specified Condition
      0 to 10°C (32 to 50°F) Ignition switch off 3.876 to 6.059 kΩ
      10 to 20°C (50 to 68°F) Ignition switch off 2.574 to 3.957 kΩ
      20 to 30°C (68 to 86°F) Ignition switch off 1.752 to 2.660 kΩ
      30 to 40°C (86 to 104°F) Ignition switch off 1.222 to 1.831 kΩ
      40 to 50°C (104 to 122°F) Ignition switch off 0.869 to 1.285 kΩ
      GTY1205055Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Battery ECU Assembly)
    • Measure the resistance according to the value (s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      o4-1 (TRF0) - Body ground and other terminals (except o4-2 (GRF0)) Ignition switch off 10 kΩ or higher
      o4-2 (GRF0) - Body ground and other terminals (except o4-1 (TRF0)) Ignition switch off 10 kΩ or higher
      o4-19 (TRF2) - Body ground and other terminals (except o4-20 (GRF2)) Ignition switch off 10 kΩ or higher
      o4-20 (GRF2) - Body ground and other terminals (except o4-19 (TRF2)) Ignition switch off 10 kΩ or higher
    • Connect the cable to the negative (-) auxiliary battery terminal.
    • Turn the ignition switch to ON.
    • Measure the voltage according to the value (s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      o4-1 (TRF0) - Body ground Ignition switch ON Below 1 V
      o4-2 (GRF0) - Body ground Ignition switch ON Below 1 V
      o4-19 (TRF2) - Body ground Ignition switch ON Below 1 V
      o4-20 (GRF2) - Body ground Ignition switch ON Below 1 V
      NOTE:
      • Turning the ignition switch to ON with the service plug grip removed causes other DTCs to be stored. Clear the DTCs after performing this inspection.
      • If the ignition switch is turned to ON with the connectors disconnected, other DTCs will be stored. Be sure to clear the DTCs after the inspection.

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • Turn the ignition switch off.
    • Disconnect the cable from the negative (-) auxiliary battery terminal.
    • Reconnect the battery ECU assembly connector.
    • Disconnect the SST.

    Result: 

    NG 

    See step  6

    Result: 

    OK 

    See step  4

  4. CHECK NO. 2 AIR CONDITIONING THERMISTOR ASSEMBLY (DUCT OUTLET 1, DUCT OUTLET 2) 
    WARNING:

    Be sure to wear insulated gloves and protective goggles.

    Pre-procedure1

    • Check that the service plug grip is not installed.
      NOTE:

      After removing the service plug grip, do not turn the ignition switch to ON (READY), unless instructed by the appropriate service information because this may cause a malfunction.

    • Connect the SST.

      HINT: 

      Refer to Instructions for Connecting SST [08/2023 - ]

    • Disconnect the battery ECU assembly connector.
      GTY1204780Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE:

      Before disconnecting the connector, check that it is not loose or disconnected.

    • Measure the resistance of the circuit for the malfunctioning sensor.

      Tester Connection

      Tester Connection No. 2 Air Conditioning Thermistor Assembly
      o4-8 (TRF1) - o4-7 (GRF1) Duct Outlet 1
      o4-21 (TRF3) - o4-22 (GRF3) Duct Outlet 2

      Standard Resistance

      Thermistor Temperature Condition Specified Condition
      0 to 10°C (32 to 50°F) Ignition switch off 3.876 to 6.059 kΩ
      10 to 20°C (50 to 68°F) Ignition switch off 2.574 to 3.957 kΩ
      20 to 30°C (68 to 86°F) Ignition switch off 1.752 to 2.660 kΩ
      30 to 40°C (86 to 104°F) Ignition switch off 1.222 to 1.831 kΩ
      40 to 50°C (104 to 122°F) Ignition switch off 0.869 to 1.285 kΩ
      GTY1205054Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Battery ECU Assembly)
    • Measure the resistance according to the value (s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      o4-8 (TRF1) - Body ground and other terminals (except o4-7 (GRF1)) Ignition switch off 10 kΩ or higher
      o4-7 (GRF1) - Body ground and other terminals (except o4-8 (TRF1)) Ignition switch off 10 kΩ or higher
      o4-21 (TRF3) - Body ground and other terminals (except (o4-22 (GRF3)) Ignition switch off 10 kΩ or higher
      o4-22 (GRF3) - Body ground and other terminals (except o4-21 (TRF3)) Ignition switch off 10 kΩ or higher
    • Connect the cable to the negative (-) auxiliary battery terminal.
    • Turn the ignition switch to ON.
    • Measure the voltage according to the value (s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      o4-8 (TRF1) - Body ground Ignition switch ON Below 1 V
      o4-7 (GRF1) - Body ground Ignition switch ON Below 1 V
      o4-21 (TRF3) - Body ground Ignition switch ON Below 1 V
      o4-22 (GRF3) - Body ground Ignition switch ON Below 1 V
      NOTE:
      • Turning the ignition switch to ON with the service plug grip removed causes other DTCs to be stored. Clear the DTCs after performing this inspection.
      • If the ignition switch is turned to ON with the connectors disconnected, other DTCs will be stored. Be sure to clear the DTCs after the inspection.

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • Turn the ignition switch off.
    • Disconnect the cable from the negative (-) auxiliary battery terminal.
    • Reconnect the battery ECU assembly connector.
    • Disconnect the SST.

    Result: 

    OK 

    REPLACE BATTERY ECU ASSEMBLY. Refer to  REMOVAL [08/2023 - ] 

    Result: 

    NG 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (NO. 2 AIR CONDITIONING THERMISTOR ASSEMBLY (DUCT OUTLET 1, DUCT OUTLET 2) - BATTERY ECU ASSEMBLY) 
    WARNING:

    Be sure to wear insulated gloves and protective goggles.

    Pre-procedure1

    • Check that the service plug grip is not installed.
      NOTE:

      After removing the service plug grip, do not turn the ignition switch to ON (READY), unless instructed by the appropriate service information because this may cause a malfunction.

    • Connect the SST.

      HINT: 

      Refer to Instructions for Connecting SST [08/2023 - ]

    • Disconnect the battery ECU assembly connector.
      GTY1204780Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE:

      Before disconnecting the connector, check that it is not loose or disconnected.

    • Disconnect the No. 2 air conditioning thermistor assembly connector.
      GTY1206140Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE:

      Before disconnecting the connector, check that it is not loose or disconnected.

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

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      o13-4 (TRR1) - o4-8 (TRF1) Ignition switch off Below 1 Ω Ω
      o13-3 (GRR1) - o4-7 (GRF1) Ignition switch off Below 1 Ω Ω
      o13-2 (TRL1) - o4-21 (TRF3) Ignition switch off Below 1 Ω Ω
      o13-1 (GRL1) - o4-22 (GRF3) Ignition switch off Below 1 Ω Ω
      o13-4 (TRR1) or o4-8 (TRF1) - Body ground and other terminals Ignition switch off 10 kΩ or higher kΩ
      o13-3 (GRR1) or o4-7 (GRF1) - Body ground and other terminals Ignition switch off 10 kΩ or higher kΩ
      o13-2 (TRL1) or o4-21 (TRF3) - Body ground and other terminals Ignition switch off 10 kΩ or higher kΩ
      o13-1 (GRL1) or o4-22 (GRF3) - Body ground and other terminals Ignition switch off 10 kΩ or higher kΩ
      GTY1203926Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 2 Air Conditioning Thermistor Assembly)
      *b Front view of wire harness connector
      (to Battery ECU Assembly)
    • Connect the cable to the negative (-) auxiliary battery terminal.
    • Turn the ignition switch to ON.
    • Measure the voltage according to the value (s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition Result
      o4-8 (TRF1) - Body ground Ignition switch ON Below 1 V V
      o4-7 (GRF1) - Body ground Ignition switch ON Below 1 V V
      o4-21 (TRF3) - Body ground Ignition switch ON Below 1 V V
      o4-22 (GRF3) - Body ground Ignition switch ON Below 1 V V
      NOTE:
      • Turning the ignition switch to ON with the service plug grip removed causes other DTCs to be stored. Clear the DTCs after performing this inspection.
      • If the ignition switch is turned to ON with the connectors disconnected, other DTCs will be stored. Be sure to clear the DTCs after the inspection.

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • Turn the ignition switch off.
    • Disconnect the cable from the negative (-) auxiliary battery terminal.
    • Reconnect the No. 2 air conditioning thermistor assembly connector.
    • Reconnect the battery ECU assembly connector.
    • Disconnect the SST.

    Result: 

    OK 

    REPLACE NO. 2 AIR CONDITIONING THERMISTOR ASSEMBLY. Refer to  REMOVAL [08/2023 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  6. CHECK HARNESS AND CONNECTOR (NO. 1 AIR CONDITIONING THERMISTOR ASSEMBLY (DUCT INLET 1, DUCT INLET 2) - BATTERY ECU ASSEMBLY) 
    WARNING:

    Be sure to wear insulated gloves and protective goggles.

    Pre-procedure1

    • Check that the service plug grip is not installed.
      NOTE:

      After removing the service plug grip, do not turn the ignition switch to ON (READY), unless instructed by the appropriate service information because this may cause a malfunction.

    • Connect the SST.

      HINT: 

      Refer to Instructions for Connecting SST [08/2023 - ]

    • Disconnect the battery ECU assembly connector.
      GTY1204780Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE:

      Before disconnecting the connector, check that it is not loose or disconnected.

    • Disconnect the No. 1 air conditioning thermistor assembly connector.
      GTY1203534Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE:

      Before disconnecting the connector, check that it is not loose or disconnected.

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

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      o14-4 (TRR0) - o4-1 (TRF0) Ignition switch off Below 1 Ω Ω
      o14-3 (GRR0) - o4-2 (GRF0) Ignition switch off Below 1 Ω Ω
      o14-2 (TRL0) - o4-19 (TRF2) Ignition switch off Below 1 Ω Ω
      o14-1 (GRL0) - o4-20 (GRF2) Ignition switch off Below 1 Ω Ω
      o14-4 (TRR0) or o4-1 (TRF0) - Body ground and other terminals Ignition switch off 10 kΩ or higher kΩ
      o14-3 (GRR0) or o4-2 (GRF0) - Body ground and other terminals Ignition switch off 10 kΩ or higher kΩ
      o14-2 (TRL0) or o4-19 (TRF2) - Body ground and other terminals Ignition switch off 10 kΩ or higher kΩ
      o14-1 (GRL0) or o4-20 (GRF2) - Body ground and other terminals Ignition switch off 10 kΩ or higher kΩ
      GTY1204993Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 1 Air Conditioning Thermistor Assembly)
      *b Front view of wire harness connector
      (to Battery ECU Assembly)
    • Connect the cable to the negative (-) auxiliary battery terminal.
    • Turn the ignition switch to ON.
    • Measure the voltage according to the value (s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition Result
      o4-1 (TRF0) - Body ground Ignition switch ON Below 1 V V
      o4-2 (GRF0) - Body ground Ignition switch ON Below 1 V V
      o4-19 (TRF2) - Body ground Ignition switch ON Below 1 V V
      o4-20 (GRF2) - Body ground Ignition switch ON Below 1 V V
      NOTE:
      • Turning the ignition switch to ON with the service plug grip removed causes other DTCs to be stored. Clear the DTCs after performing this inspection.
      • If the ignition switch is turned to ON with the connectors disconnected, other DTCs will be stored. Be sure to clear the DTCs after the inspection.

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • Turn the ignition switch off.
    • Disconnect the cable from the negative (-) auxiliary battery terminal.
    • Reconnect the No. 1 air conditioning thermistor assembly connector.
    • Reconnect the battery ECU assembly connector.
    • Disconnect the SST.

    Result: 

    OK 

    REPLACE NO. 1 AIR CONDITIONING THERMISTOR ASSEMBLY. Refer to  REMOVAL [08/2023 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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