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Home >> Toyota >> 2020 >> RAV4 LE, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 133 (Hybrid Control System (Lithium-Ion Battery) - Diagnostic Codes (6 Of 6) & Circuit Tests (1 Of 2)) >> HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY) >> DTC U0111-87: Lost Communication with Hybrid/EV Battery Energy Control Module "A" Missing Message [06/2020 - ] >> Procedure

DTC U0111-87: Lost Communication with Hybrid/EV Battery Energy Control Module "A" Missing Message [06/2020 - ]: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. CHECK DTC OUTPUT (HV BATTERY) 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Enter the following menus: Powertrain / HV Battery / Trouble Codes.
    4. Check and record any HV system DTCs and freeze frame data. Check for DTCs.

      Powertrain > HV Battery > Trouble Codes 

      Result

      Result Proceed to
      DTCs related to HV Battery are not output. A
      DTCs related to HV Battery are output. B
    5. Turn the ignition switch off.

    Result: 

    B 

    GO TO DTC CHART (HV BATTERY SYSTEM) 

    Refer to DIAGNOSTIC TROUBLE CODE CHART [06/2020 - ]

    Result: 

    A 

    See step  2

  2. CHECK BATTERY ECU ASSEMBLY (IGCT VOLTAGE) 
    WARNING:

    Be sure to wear insulated gloves.

    1. 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.

    2. Remove the No. 1 HV battery hose.

      Refer to PROCEDURE - Step 23 [06/2020 - 08/2020] , or refer to PROCEDURE - Step 23 [08/2020 - 12/2021] , or refer to PROCEDURE - Step 23 [12/2021 - 10/2022] , or refer to PROCEDURE - Step 23 [10/2022 - 10/2023] , or refer to PROCEDURE - Step 23 [10/2023 - ]

    3. Disconnect the z26 battery ECU assembly connector.
      NOTE:

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

    4. Connect the cable to the negative (-) auxiliary battery terminal.
    5. Measure the voltage according to the value(s) in the table below.
      GTY993880Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (Battery ECU Assembly)

      Standard Voltage

      Tester Connection Condition Specified Condition
      z26-1(AM) - z26-27(GND) Ignition switch off 11 to 14 V
      z26-13(IGCT) - z26-27(GND) Ignition switch ON 11 to 14 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.

      HINT: 

      As there might be an intermittent malfunction in the battery ECU assembly power source circuit, inspect the following even if the measured voltage is as specified:

      • Installation condition of fuse(s) (before removing fuse(s)) (IGCT circuit)
      • Fuse condition (before and after removing fuse(s)) (IGCT circuit)
      • Connection condition of connectors (IGCT circuit)
      • Wire harness condition (IGCT circuit)
      • Wire harness condition (GND circuit)
    6. Turn the ignition switch off.
    7. Disconnect the cable from the negative (-) auxiliary battery terminal.
    8. Reconnect the z26 battery ECU assembly connector.
    9. Install the No. 1 HV battery hose.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

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

    Result: 

    OK 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU ASSEMBLY - BATTERY ECU ASSEMBLY) 
    WARNING:

    Be sure to wear insulated gloves.

    1. 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.

    2. Disconnect the A31 hybrid vehicle control ECU assembly connector.
      NOTE:
      • Before disconnecting the connector, check that it is not loose or disconnected.
      • Check that each connector between the hybrid vehicle control ECU assembly and battery ECU assembly is not loose or disconnected.
    3. Remove the No. 1 HV battery hose.

      Refer to PROCEDURE - Step 23 [06/2020 - 08/2020] , or refer to PROCEDURE - Step 23 [08/2020 - 12/2021] , or refer to PROCEDURE - Step 23 [12/2021 - 10/2022] , or refer to PROCEDURE - Step 23 [10/2022 - 10/2023] , or refer to PROCEDURE - Step 23 [10/2023 - ]

    4. Disconnect the z26 battery ECU assembly connector.
      GTY975401Courtesy 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.
    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      z26-25(CA1H) - A31-9(CA4H) Ignition switch off Below 1 Ω
      z26-26(CA1L) - A31-22(CA4L) Ignition switch off Below 1 Ω
      A31-9 (CA4H) - Other terminals and body ground Ignition switch off 10 kΩ or higher
      A31-22(CA4L) - Other terminals and body ground Ignition switch off 10 kΩ or higher
      GTY976804Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Battery ECU Assembly)
      *b Front view of wire harness connector
      (to Hybrid Vehicle Control ECU assembly)
      NOTE:

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

    6. Connect the cable to the negative (-) auxiliary battery terminal.
    7. Turn the ignition switch to ON.
    8. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      z26-25 (CA1H) - Body ground Ignition switch ON Below 1 V
      z26-26 (CA1L) - 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.
    9. Turn the ignition switch off.
    10. Disconnect the cable from the negative (-) auxiliary battery terminal.
    11. Reconnect the z26 battery ECU assembly connector.
    12. Install the No. 1 HV battery hose.
    13. Reconnect the A31 hybrid vehicle control ECU assembly connector.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  4

  4. CHECK HYBRID VEHICLE CONTROL ECU ASSEMBLY 
    WARNING:

    Be sure to wear insulated gloves.

    1. 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.

    2. Remove the No. 1 HV battery hose.

      Refer to PROCEDURE - Step 23 [06/2020 - 08/2020] , or refer to PROCEDURE - Step 23 [08/2020 - 12/2021] , or refer to PROCEDURE - Step 23 [12/2021 - 10/2022] , or refer to PROCEDURE - Step 23 [10/2022 - 10/2023] , or refer to PROCEDURE - Step 23 [10/2023 - ]

    3. Disconnect the z26 battery ECU assembly connector.
      NOTE:

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

      GTY975401Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Connect the cable to the negative (-) auxiliary battery terminal.
    5. Turn the ignition switch to ON.
    6. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      z26-25(CA1H) - z26-27(GND) Ignition switch ON 2.5 to 3.5 V
      z26-26(CA1L) - z26-27(GND) Ignition switch ON 1.5 to 2.5 V
      GTY993881Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Battery ECU Assembly)
      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.
    7. Turn the ignition switch off.
    8. Disconnect the cable from the negative (-) auxiliary battery terminal.
    9. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      z26-25(CA1H) - z26-26(CA1L) Ignition switch off 108 to 132 Ω
    10. Reconnect the z26 battery ECU assembly connector.
    11. Install the No. 1 HV battery protector.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE BATTERY ECU ASSEMBLY 

    Refer to REMOVAL [06/2020 - 08/2020] , or refer to REMOVAL [08/2020 - 12/2021] , or refer to REMOVAL [12/2021 - 10/2022] , or refer to REMOVAL [10/2022 - 10/2023] , or refer to REMOVAL [10/2023 - ]

    Result: 

    NG 

    REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY 

    Refer to REMOVAL [10/2019 - 08/2020] , or refer to REMOVAL [08/2020 - 12/2021] , or refer to REMOVAL [12/2021 - 10/2022] , or refer to REMOVAL [10/2022 - 10/2023] , or refer to REMOVAL [10/2023 - ]

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