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Home >> Toyota >> 2021 >> Mirai XLE >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Testing and Diagnosis >> Hybrid Battery System - Diagnostic Codes (8 Of 8) & Symptom Tests >> Hybrid Battery System >> DTC U1150-87: Lost Communication with Hybrid Powertrain Control Module (Hybrid/EV Battery Local Bus) Missing Message [12/2023 - ] >> Procedure

DTC U1150-87: Lost Communication with Hybrid Powertrain Control Module (Hybrid/EV Battery Local Bus) Missing Message [12/2023 - ]: Procedure

  1. CHECK DTC OUTPUT (EV) 

    Pre-procedure1

    • None.
    • Check for DTCs.

      Powertrain > EV > Trouble Codes 

      Result

      Result Proceed to
      DTCs are not output A
      DTCs are output B

    Post-procedure1

    • Turn the ignition switch off.

    Result: 

    B 

    GO TO DTC CHART (HYBRID CONTROL SYSTEM). Refer to  DIAGNOSTIC TROUBLE CODE CHART [12/2023 - ] 

    Result: 

    A 

    See step  2

  2. CHECK EV CONTROL ECU (VOLTAGE) 

    Pre-procedure1

    • Turn the ignition switch to ON.
    • Measure the voltage according to the value(s) in the table below.
      GTY1002564Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (EV Control ECU)

      Standard Voltage

      Tester Connection Condition Specified Condition Result
      A17-1 (+B1) - Body ground Ignition switch ON 11 to 14 V V
      A8-7 (+B2) - Body ground Ignition switch ON 11 to 14 V V

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • Turn the ignition switch off.

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY ECU ASSEMBLY POWER SOURCE CIRCUIT) 

    Result: 

    OK 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (EV CONTROL ECU - NO. 2 EV BATTERY PACK WIRE CONNECTOR) 
    WARNING:

    Be sure to wear insulated gloves and protective goggles.

    Pre-procedure1

    • Check that the service plug grip and FC converter power outlet cable are not installed.
      NOTE:

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

    • Remove the center No. 2 floor to brace extension.

      HINT: 

      Refer to REMOVAL [12/2023 - ]

    • Disconnect the G156 No. 2 EV battery pack wire connector.
      NOTE:
      • Before disconnecting the connector, check that it is not loose or disconnected.
      • Check the terminals of the connector for deformation and corrosion.
      GTY972715Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    • Measure the resistance according to the value(s) in the table below.
      GTY972476Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (No. 2 EV Battery Pack Wire Connector)

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      G156-4 (CA1H) - G156-13 (CA1L) Ignition switch off 108 to 132 Ω Ω

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • Reconnect the G156 No. 2 EV battery pack wire connector.
    • Install the center No. 2 floor to brace extension.

    Result: 

    NG 

    See step  5

    Result: 

    OK 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (BATTERY ECU ASSEMBLY - NO. 2 EV BATTERY PACK WIRE CONNECTOR) 
    WARNING:

    Be sure to wear insulated gloves and protective goggles.

    Pre-procedure1

    • Check that the service plug grip and FC converter power outlet cable are not installed.
      NOTE:

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

    • Remove the upper No. 1 EV battery cover sub-assembly.

      HINT: 

      Refer to REMOVAL [12/2023 - ]

    • Disconnect the z26 battery ECU assembly connector.
      GTY972496Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE:
      • Before disconnecting the connector, check that it is not loose or disconnected.
      • Check the terminals of the connector for deformation and corrosion.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      z26-16 (CA1H) - G156-4 (CA1H) Always Below 1 Ω Ω
      z26-15 (CA1L) - G156-13 (CA1L) Always Below 1 Ω Ω
      z26-16 (CA1H) or G156-4 (CA1H) - Body ground and other terminals Always 10 kΩ or higher kΩ
      z26-15 (CA1L) or G156-13 (CA1L) - Body ground and other terminals Always 10 kΩ or higher kΩ
      GTY972442Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (No. 2 EV Battery Pack Wire Connector)
      *b Rear view of wire harness connector
      (to Battery ECU Assembly)

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • Reconnect the z26 battery ECU assembly connector.
    • Install the upper No. 1 EV battery cover sub-assembly.

    Result: 

    OK 

    REPLACE BATTERY ECU ASSEMBLY. Refer to  REMOVAL [12/2023 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  5. CHECK HARNESS AND CONNECTOR (EV CONTROL ECU - NO. 2 EV BATTERY PACK WIRE CONNECTOR) 
    WARNING:

    Be sure to wear insulated gloves and protective goggles.

    Pre-procedure1

    • Check that the service plug grip and FC converter power outlet cable are not installed.
      NOTE:

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

    • Disconnect the A8 EV control ECU connector.
      NOTE:
      • Before disconnecting the connector, check that it is not loose or disconnected.
      • Check that each connector between the EV control ECU and battery ECU assembly is not loose or disconnected.
    • Disconnect the D92 shift control ECU connector.
      NOTE:

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

    • Remove the center No. 2 floor to brace extension.

      HINT: 

      Refer to REMOVAL [12/2023 - ]

    • Disconnect the G156 No. 2 EV battery pack wire connector.
      NOTE:
      • Before disconnecting the connector, check that it is not loose or disconnected.
      • Check the terminals of the connector for deformation and corrosion.
      GTY972715Courtesy 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
      G156-4 (CA1H) - A8-2 (CA4H) Ignition switch off Below 1 Ω Ω
      G156-13 (CA1L) - A8-3 (CA4L) Ignition switch off Below 1 Ω Ω
      G156-4 (CA1H) or A8-2 (CA4H) - Other terminals and body ground Ignition switch off 10 kΩ or higher kΩ
      G156-13 (CA1L) or A8-3 (CA4L) - Other terminals and body ground Ignition switch off 10 kΩ or higher kΩ
      GTY1004013Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (No. 2 EV Battery Pack Wire Connector)
      *b Rear view of wire harness connector
      (to EV Control ECU)
      NOTE:

      Make sure that each connector between the battery ECU assembly and EV control ECU is not loose or disconnected and its terminals are not deformed or corroded.

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • Reconnect the G156 No. 2 EV battery pack wire connector.
    • Install the center No. 2 floor to brace extension.
    • Reconnect the D92 shift control ECU connector.
    • Reconnect the A8 EV control ECU connector.

    Result: 

    OK 

    REPLACE EV CONTROL ECU. Refer to  REMOVAL [12/2023 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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