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Home >> Lexus >> 2024 >> TX 350 Base, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 71 (Plug-In Charge Control System - Diagnostic Codes (3 Of 3) & Symptom Tests) >> PLUG-IN CHARGE CONTROL SYSTEM (for PHEV Model) >> ECU Power Source Circuit [12/2023 - ] >> Procedure

ECU Power Source Circuit [12/2023 - ]: Procedure

WARNING: This page is about a different car, the 2024 Lexus TX 550h+. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK DTC OUTPUT (HEALTH CHECK) 
    1. Enter the following menus: Health Check.
    2. Check DTCs.

      Result

      Result Proceed to
      No DTCs are output A
      DTCs are output B
    3. Turn the ignition switch off.

    Result: 

    B 

    GO TO DTC CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [12/2023 - ] 

    Result: 

    A 

    See step  2

  2. CHECK ELECTRIC VEHICLE CHARGER ASSEMBLY (BODY GROUND) 
    1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      Case of electric vehicle charger assembly - Body ground Always Below 1 Ω

      HINT: 

      As the electric vehicle charger assembly is grounded through its case, make sure that the installation bolts of the electric vehicle charger assembly are tightened to the specified torque.

      Refer to INSTALLATION [12/2023 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    TIGHTEN INSTALLATION BOLT. Refer to  INSTALLATION [12/2023 - ] 

    Result: 

    OK 

    See step  3

  3. CHECK ELECTRIC VEHICLE CHARGER ASSEMBLY (AMD2 TERMINAL VOLTAGE) 

    See step  4

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    See step  5

    Result: 

    OK 

    See step  4

  4. CHECK ELECTRIC VEHICLE CHARGER 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 service information because this may cause a malfunction.

    2. Connect the cable to the negative (-) auxiliary battery terminal.
    3. Disconnect the J84 electric vehicle charger assembly connector.
    4. Turn the ignition switch to ON.
    5. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      J84-5 (IGCT) - Body ground Ignition switch ON 11 to 14 V

      Result

      Proceed to
      OK
      NG
    6. Turn the ignition switch off.
    7. Reconnect the electric vehicle charger assembly connector.
    8. Disconnect the cable from the negative (-) auxiliary battery terminal.

    Result: 

    OK 

    GO TO PROBLEM SYMPTOMS TABLE (PLUG-IN CHARGE CONTROL SYSTEM). Refer to  PROBLEM SYMPTOMS TABLE [12/2023 - ] 

    Result: 

    NG 

    See step  6

  5. CHECK FUSE (AMD) 
    1. Remove the AMD fuse from the No. 1 luggage room relay block and No. 1 junction block assembly.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      AMD fuse terminals Always Below 1 Ω

      Result

      Proceed to
      OK
      NG
    3. Install the AMD fuse.

    Result: 

    OK 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (AMD2 FUSE HOLDER - ELECTRIC VEHICLE CHARGER ASSEMBLY) 

    Result: 

    NG 

    See step  9

  6. CHECK FUSE (IGCT NO. 4) 
    1. Remove the IGCT NO. 4 fuse from the No. 1 luggage room relay block and No. 1 junction block assembly.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      IGCT NO. 4 fuse terminals Always Below 1 Ω

      Result

      Proceed to
      OK
      NG
    3. Install the IGCT NO. 4 fuse.

    Result: 

    NG 

    See step  10

    Result: 

    OK 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (NO. 1 LUGGAGE ROOM RELAY BLOCK AND NO. 1 JUNCTION BLOCK - ELECTRIC VEHICLE CHARGER 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 service information because this may cause a malfunction.

    2. Remove the IGCT NO. 4 fuse from the No. 1 luggage room relay block and No. 1 junction block assembly.
    3. Disconnect the J84 electric vehicle charger assembly connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      J84-5 (IGCT) - IGCT NO. 4 fuse terminal 2 Always Below 1 Ω

      Result

      Proceed to
      OK
      NG
    5. Reconnect the electric vehicle charger assembly connector.
    6. Install the IGCT NO. 4 fuse.

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  8

  8. INSPECT RELAY (IGCT) 

    Refer to PROCEDURE - Step 1

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (IGCT RELAY HOLDER - IGCT NO. 4 FUSE HOLDER) 

    Result: 

    NG 

    REPLACE RELAY (IGCT) 

  9. CHECK HARNESS AND CONNECTOR (NO. 1 LUGGAGE ROOM RELAY BLOCK AND NO. 1 JUNCTION BLOCK ASSEMBLY - ELECTRIC VEHICLE CHARGER 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 service information because this may cause a malfunction.

    2. Remove the AMD fuse from the No. 1 luggage room relay block and No. 1 junction block assembly.
    3. Disconnect the J85 electric vehicle charger assembly connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      J85-1 (AMD2) or AMD fuse terminal 2 - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG
    5. Reconnect the electric vehicle charger assembly connector.
    6. Install the AMD fuse.

    Result: 

    OK 

    REPLACE FUSE (AMD) 

    Result: 

    NG 

    See step  11

  10. CHECK HARNESS AND CONNECTOR (NO. 1 LUGGAGE ROOM RELAY BLOCK AND NO. 1 JUNCTION BLOCK ASSEMBLY - ELECTRIC VEHICLE CHARGER 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 service information because this may cause a malfunction.

    2. Disconnect the J84 electric vehicle charger assembly connector.
    3. Disconnect the D25 transmission floor shift assembly (shift control ECU) connector.
    4. Disconnect the C53 shift control actuator assembly (shift actuator ECU) connector.
    5. Disconnect the I33 voltage inverter assembly connector. (w/ voltage inverter assembly)
    6. Remove the IGCT NO. 4 fuse from the No. 1 luggage room relay block and No. 1 junction block assembly.
    7. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      J84-5 (IGCT) or IGCT NO. 4 fuse terminal 2 - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG
    8. Reconnect the voltage inverter assembly connector. (w/ voltage inverter assembly)
    9. Reconnect the shift control actuator assembly (shift actuator ECU) connector.
    10. Reconnect the transmission floor shift assembly (shift control ECU) connector.
    11. Reconnect the electric vehicle charger assembly connector.
    12. Install the IGCT NO. 4 fuse.

    Result: 

    OK 

    REPLACE FUSE (IGCT NO. 4) 

    Result: 

    NG 

    See step  12

  11. REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    REPLACE FUSE (AMD) 

  12. REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    REPLACE FUSE (IGCT NO. 4) 

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