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Home >> Toyota >> 2019 >> RAV4 LE, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 55 (Hybrid Battery System (Lithium-Ion Battery) - Diagnostic Codes (3 Of 3) & Circuit Tests) >> HYBRID BATTERY SYSTEM (for LITHIUM-ION BATTERY) >> ECU Power Source Circuit [06/2020 - ] >> Procedure

ECU Power Source Circuit [06/2020 - ]: Procedure

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

    Be sure to wear insulated gloves and protective goggles.

    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
      z26-13 (IGCT) - Body ground Ignition switch ON 11 to 14 V
      GTY993875Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Battery ECU Assembly)
    7. Turn the ignition switch off.
    8. Disconnect the cable from the negative (-) auxiliary battery terminal.
    9. Reconnect the z26 battery ECU assembly connector.
    10. Install the No. 1 HV battery hose.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  3

    Result: 

    OK 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (BATTERY ECU ASSEMBLY - BODY GROUND) 
    WARNING:

    Be sure to wear insulated gloves and protective goggles.

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      z26-27 (GND) - Body ground Always Below 1 Ω
      z26-3 (GND1) - Body ground Always Below 1 Ω
      z26-4 (ERTH) - Body ground Always Below 1 Ω
      GTY993824Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Battery ECU Assembly)
    5. Reconnect the z26 battery ECU assembly connector.
    6. Install the No. 1 HV battery hose.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    GO TO PROBLEM SYMPTOMS TABLE 

    Refer to PROBLEM SYMPTOMS TABLE [06/2020 - ]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  3. CHECK FUSE (IGCT NO. 2) 
    1. Remove the IGCT NO. 2 fuse from the No. 3 relay block and junction block assembly.
      GTY895196Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 3 Relay Block and Junction Block Assembly
      *2 IGCT NO. 2 Fuse
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      IGCT NO. 2 fuse Always Below 1 Ω
    3. Install the IGCT NO. 2 fuse to the No. 3 relay block and junction block assembly.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  6

    Result: 

    OK 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (NO. 3 RELAY BLOCK AND JUNCTION BLOCK ASSEMBLY - BATTERY ECU ASSEMBLY) 
    WARNING:

    Be sure to wear insulated gloves and protective goggles.

    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. Remove the IGCT NO. 2 fuse from the No. 3 relay block and junction block assembly.
    5. Measure the resistance according to the value(s) in the table below.
      GTY976265Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 3 Relay Block and Junction Block Assembly *a IGCT NO. 2 Fuse Terminal
      *b Front view of wire harness connector
      (to Battery ECU Assembly)      		 - -

      Standard Resistance

      Tester Connection Condition Specified Condition
      z26-13 (IGCT) - 2 (IGCT NO. 2 fuse terminal) Always Below 1 Ω
    6. Install the IGCT NO. 2 fuse to the No. 3 relay block and junction block assembly.
    7. Reconnect the z26 battery ECU assembly connector.
    8. Install the No. 1 HV battery hose.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (NO. 3 RELAY BLOCK AND JUNCTION BLOCK ASSEMBLY) 
    1. Remove the IGCT NO. 2 fuse and IGCT relay from the No. 3 relay block and junction block assembly.
    2. Measure the resistance according to the value(s) in the table below.
      GTY976446Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 3 Relay Block and Junction Block Assembly *a IGCT NO. 2 Fuse Terminal
      *b IGCT Relay Terminal - -

      Standard Resistance

      Tester Connection Condition Specified Condition
      5 (IGCT relay terminal 5) - 1 (IGCT NO. 2 fuse terminal 1) Always Below 1 Ω
    3. Install the IGCT NO. 2 fuse and IGCT relay to the No. 3 relay block and junction block assembly.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    CHECK ECU Power Source Circuit (HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY)) 

    Refer to ECU Power Source Circuit [06/2020 - ]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  6. CHECK HARNESS AND CONNECTOR (NO. 4 RELAY BLOCK - BATTERY ECU ASSEMBLY) 
    WARNING:

    Be sure to wear insulated gloves and protective goggles.

    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. Remove the IGCT NO. 2 fuse from the No. 4 relay block.
    5. Measure the resistance according to the value(s) in the table below.
      GTY976265Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 3 Relay Block and Junction Block Assembly *a IGCT NO. 2 Fuse Terminal
      *b Front view of wire harness connector
      (to Battery ECU Assembly)      		 - -

      Standard Resistance

      Tester Connection Condition Specified Condition
      z26-13 (IGCT) or 2 (IGCT-NO. 2 fuse terminal) - Body ground and other terminals Always Below 1 Ω
    6. Install the IGCT NO. 2 fuse to the No. 3 relay block and junction block assembly.
    7. Reconnect the z26 battery ECU assembly connector.
    8. Install the No. 1 HV battery hose.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE FUSE (IGCT NO. 2) 

    Result: 

    NG 

    See step  7

  7. REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    REPLACE FUSE (IGCT NO. 2) 

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