LEMON Manuals: Even more car manuals for everyone
Home >> Toyota >> 2021 >> Venza LE >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Testing and Diagnosis >> Hybrid Battery System - Diagnostic Codes (2 Of 2) & Symptom Tests >> Hybrid Battery System >> ECU Power Source Circuit [07/2020 - ] >> Procedure

ECU Power Source Circuit [07/2020 - ]: Procedure

  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 REMOVAL [07/2020 - 10/2022] , or refer to REMOVAL [10/2022 - ]

    3. Disconnect the y8 battery ECU assembly connector.
      NOTE:

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

      GTY995512Courtesy 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
      y8-13 (IGCT) - Body ground Ignition switch ON 11 to 14 V
      GTY993858Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Battery ECU Assembly)
      NOTE:
      • Turning the power switch on (IG) with the service plug grip removed causes other DTCs to be stored. Clear the DTCs after performing this inspection.
      • If the power switch is turned on (IG) 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. Reconnect the y8 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 REMOVAL [07/2020 - 10/2022] , or refer to REMOVAL [10/2022 - ]

    3. Disconnect the y8 battery ECU assembly connector.
      GTY995512Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE:

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

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      y8-27 (GND) - Body ground Always Below 1 Ω
      y8-3 (GND1) - Body ground Always Below 1 Ω
      y8-4 (ERTH) - Body ground Always Below 1 Ω
      GTY993717Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Battery ECU Assembly)
    5. Reconnect the y8 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 [07/2020 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  3. CHECK FUSE (IGCT NO. 2) 
    1. Remove the IGCT NO. 2 fuse from the fusible link block assembly.
      GTY973316Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Fusible Link 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.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  6

    Result: 

    OK 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (FUSIBLE LINK 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 REMOVAL [07/2020 - 10/2022] , or refer to REMOVAL [10/2022 - ]

    3. Disconnect the y8 battery ECU assembly connector.
      NOTE:

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

      GTY995512Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Remove the IGCT NO. 2 fuse from the fusible link block assembly.
    5. Measure the resistance according to the value(s) in the table below.
      GTY995736Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Fusible Link Block Assembly *2 IGCT NO. 2 Fuse Holder
      *a Front view of wire harness connector
      (to Battery ECU Assembly)      		 - -

      Standard Resistance

      Tester Connection Condition Specified Condition
      y8-13 (IGCT) - 2 (IGCT NO. 2 fuse holder) Always Below 1 Ω
    6. Install the IGCT NO. 2 fuse.
    7. Reconnect the y8 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 (FUSIBLE LINK BLOCK ASSEMBLY) 
    1. Remove the IGCT relay and IGCT NO. 2 fuse from the fusible link block assembly.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      5 (IGCT relay holder 5) - 1 (IGCT NO. 2 fuse holder 1) Always Below 1 Ω
      GTY995653Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Fusible Link Block Assembly
      *2 IGCT Relay Holder
      *3 IGCT NO. 2 Fuse Holder
    3. Install the IGCT relay and IGCT NO. 2 fuse.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    CHECK ECU Power Source Circuit (HYBRID CONTROL SYSTEM). Refer to  ECU Power Source Circuit [07/2020 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  6. CHECK HARNESS AND CONNECTOR (FUSIBLE LINK 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 REMOVAL [07/2020 - 10/2022] , or refer to REMOVAL [10/2022 - ]

    3. Disconnect the y8 battery ECU assembly connector.
      NOTE:

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

      GTY995512Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Remove the IGCT NO. 2 fuse from the fusible link block assembly.
    5. Measure the resistance according to the value(s) in the table below.
      GTY995737Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Fusible Link Block Assembly *2 IGCT NO. 2 Fuse Holder
      *a Front view of wire harness connector
      (to Battery ECU Assembly)      		 - -

      Standard Resistance

      Tester Connection Condition Specified Condition
      y8-13 (IGCT) or 2 (IGCT-NO. 2 fuse holder) - Body ground and other terminals Always 10 kΩ or higher
    6. Install the IGCT NO. 2 fuse.
    7. Reconnect the y8 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) 

scientia non olet · About LEMON Manuals