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Home >> Lexus >> 2024 >> TX 350 Base, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 84 (Hybrid Control System - Diagnostic Codes (5 Of 5) & Circuit Tests) >> HYBRID CONTROL SYSTEM (for 1Motor-HEV Model) >> DTC U117E-87: Lost Communication with Drive Motor Control Module "A" (ch4) Missing Message [09/2023 - ] >> Procedure

DTC U117E-87: Lost Communication with Drive Motor Control Module "A" (ch4) Missing Message [09/2023 - ]: Procedure

WARNING: This page is about a different car, the 2024 Lexus TX 500h. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK CAN COMMUNICATION LINE (ML-BUS) 

    Pre-procedure1

    • Disconnect the cable from the negative (-) auxiliary battery terminal.
    • Disconnect the hybrid vehicle control ECU assembly connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      B21-2 (CA5H) - B21-1 (CA5L) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω Ω
      B21-2 (CA5H) or B21-1 (CA5L) - Other power supply terminals Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher kΩ
      B21-2 (CA5H) or B21-1 (CA5L) - Body ground and other terminals Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Ω

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • Reconnect the hybrid vehicle control ECU assembly connector.
    • Reconnect the cable to the negative (-) auxiliary battery terminal.

    Result: 

    NG 

    See step  8

    Result: 

    OK 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (HYBRID MOTOR CONTROL INVERTER ASSEMBLY - HYBRID VEHICLE CONTROL ECU ASSEMBLY) 
    WARNING:

    Be sure to wear insulated gloves.

    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 service information because this may cause a malfunction.

    • Disconnect the hybrid motor control inverter assembly connector.
      GTY1198206Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    • Disconnect the hybrid vehicle control ECU assembly connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      C46-12 (HMH1) - B21-2 (CA5H) Always Below 1 Ω Ω
      C46-13 (HML1) - B21-1 (CA5L) Always Below 1 Ω Ω
      C46-12 (HMH1) or B21-2 (CA5H) - Body ground and other terminals Always 10 kΩ or higher kΩ
      C46-13 (HML1) or B21-1 (CA5L) - Body ground and other terminals Always 10 kΩ or higher kΩ

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • Reconnect the hybrid vehicle control ECU assembly connector.
    • Reconnect the hybrid motor control inverter assembly connector.

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (HYBRID MOTOR CONTROL INVERTER ASSEMBLY POWER SOURCE CIRCUIT) 
    WARNING:

    Be sure to wear insulated gloves.

    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 service information because this may cause a malfunction.

    • Disconnect the hybrid motor control inverter assembly connector.
    • Measure the resistance according to the value(s) in the table below.
      GTY1198206Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition
      C46-30 (GND1) - Body ground Ignition switch off Below 1 Ω
      C46-31 (GND2) - Body ground Ignition switch off Below 1 Ω

    Pre-procedure2

    • 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
      C46-10 (IGC1) - Body ground Ignition switch ON Same as auxiliary battery voltage
      C46-11 (IGC2) - Body ground Ignition switch ON Same as auxiliary battery voltage
      NOTE:

      Turning the ignition switch to ON with the hybrid motor control inverter assembly connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • Turn the ignition switch off.
    • Disconnect the cable from the negative (-) auxiliary battery terminal and wait for 2 minutes or more.
    • Reconnect the hybrid motor control inverter assembly connector.

    Result: 

    NG 

    See step  7

    Result: 

    OK 

    See step  4

  4. REPLACE HYBRID MOTOR CONTROL INVERTER ASSEMBLY 

    HINT: 

    Refer to REMOVAL [09/2023 - ]

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  5

  5. CLEAR DTC 

    Refer to PROCEDURE - Step 3

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  6

  6. CHECK WHETHER DTC OUTPUT RECURS (DTC U117E-87) 

    Pre-procedure1

    • Turn the ignition switch to ON and wait for 2 minutes or more.
    • Read the DTCs.

      Powertrain > Engine > Trouble Codes 

      Result

      Result Proceed to
      DTCs are not output A
      U117E-87 is output B

    Post-procedure1

    • Turn the ignition switch off.

    Result: 

    A 

    END 

    Result: 

    B 

    REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY. Refer to  REMOVAL [09/2023 - 12/2023]  , or refer to  REMOVAL [12/2023 - ] 

  7. REPAIR OR REPLACE INVERTER LOW-VOLTAGE CIRCUIT 

    Refer to Inverter Low-voltage Circuit [09/2023 - ] 

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    END 

  8. CHECK HYBRID MOTOR CONTROL INVERTER ASSEMBLY 
    WARNING:

    Be sure to wear insulated gloves.

    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 service information because this may cause a malfunction.

    • Disconnect the cable from the negative (-) auxiliary battery terminal.
    • Disconnect the hybrid motor control inverter assembly connector.

      HINT: 

      Check the other ECUs are connected.

      GTY1198206Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      C46-12 (HMH1) - C46-13 (HML1) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω Ω
      C46-15 (HMH2) - C46-14 (HML2) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω Ω
      C46-12 (HMH1) or C46-13 (HML1) - Other power supply terminals Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher kΩ
      C46-15 (HMH2) or C46-14 (HML2) - Other power supply terminals Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher kΩ
      C46-12 (HMH1) or C46-13 (HML1) - Body ground and other terminals Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Ω
      C46-15 (HMH2) or C46-14 (HML2) - Body ground and other terminals Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Ω

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • Reconnect the hybrid motor control inverter assembly connector.
    • Reconnect the cable to the negative (-) auxiliary battery terminal.

    Result: 

    OK 

    REPLACE HYBRID MOTOR CONTROL INVERTER ASSEMBLY. Refer to  REMOVAL [09/2023 - ] 

    Result: 

    NG 

    See step  9

  9. CHECK ECM 

    Pre-procedure1

    • Disconnect the cable from the negative (-) auxiliary battery terminal.
    • Disconnect the ECM connector.

      HINT: 

      Check the other ECUs are connected.

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

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      B77-18 (CFDP) - B77-17 (CFDN) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω Ω
      B77-18 (CFDP) or B77-17 (CFDN) - Other power supply terminals Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher kΩ
      B77-18 (CFDP) or B77-17 (CFDN) - Body ground and other terminals Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Ω

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • Reconnect the ECM connector.
    • Reconnect the cable to the negative (-) auxiliary battery terminal.

    Result: 

    OK 

    REPLACE ECM. Refer to  REMOVAL [09/2023 - ] 

    Result: 

    NG 

    See step  10

  10. CHECK TCM 

    Pre-procedure1

    • Disconnect the cable from the negative (-) auxiliary battery terminal.
    • Disconnect the TCM connector.

      HINT: 

      Check the other ECUs are connected.

      GTY1195148Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      C25-15 (CANU) - C25-16 (CAND) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω Ω
      C25-15 (CANU) or C25-16 (CAND) - Other power supply terminals Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher kΩ
      C25-15 (CANU) or C25-16 (CAND) - Body ground and other terminals Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Ω

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • Reconnect the TCM connector.
    • Reconnect the cable to the negative (-) auxiliary battery terminal.

    Result: 

    OK 

    REPLACE TCM. Refer to  REMOVAL [09/2023 - ] 

    Result: 

    NG 

    See step  11

  11. CHECK EV MOTOR CONTROL INVERTER ASSEMBLY 
    WARNING:

    Be sure to wear insulated gloves.

    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 service information because this may cause a malfunction.

    • Disconnect the cable from the negative (-) auxiliary battery terminal.
    • Disconnect the EV motor control inverter assembly connector.

      HINT: 

      Check the other ECUs are connected.

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

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      J72-32 (HMH3) - J72-33 (HML3) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω Ω
      J72-34 (HMH4) - J72-35 (HML4) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω Ω
      J72-32 (HMH3) or J72-33 (HML3) - Other power supply terminals Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher kΩ
      J72-34 (HMH4) or J72-35 (HML4) - Other power supply terminals Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher kΩ
      J72-32 (HMH3) or J72-33 (HML3) - Body ground and other terminals Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Ω
      J72-34 (HMH4) or J72-35 (HML4) - Body ground and other terminals Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Ω

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • Reconnect the EV motor control inverter assembly connector.
    • Reconnect the cable to the negative (-) auxiliary battery terminal.

    Result: 

    OK 

    REPLACE EV MOTOR CONTROL INVERTER ASSEMBLY. Refer to  REMOVAL [09/2023 - 12/2023]  , or refer to  REMOVAL [12/2023 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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