LEMON Manuals: Even more car manuals for everyone
Home >> Toyota >> 2024 >> Corolla LE >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 85 (Can Communication System (HEV) - Circuit Tests (1 Of 6) & Diagnostic Codes) >> CAN COMMUNICATION SYSTEM (for HV Model) >> Main Body ECU Communication Stop Mode [09/2022 - 11/2022] >> Procedure

Main Body ECU Communication Stop Mode [09/2022 - 11/2022]: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. CHECK FOR OPEN IN CAN BUS LINES (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) MAIN LINE) 
    1. Disconnect the cable from the negative (-) auxiliary battery terminal.
    2. Disconnect the I85 main body ECU (multiplex network body ECU) connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I85-2 (CANH) - I85-1 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      GTY1112705Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Main Body ECU (Multiplex Network Body ECU))

      Result

      Result 
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) 

    Result: 

    OK 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) 
    1. Remove the main body ECU (multiplex network body ECU).

      Refer to REMOVAL [09/2022 - 11/2022]

    2. Measure the resistance according to the value(s) in the table below.
      GTY1112038Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Power Distribution Box Assembly

      Standard Resistance

      Tester Connection Condition Specified Condition
      MB-13 (GND1) - Body ground Cable disconnected from negative (-) auxiliary battery terminal Below 1 Ω
      MB-14 (GND2) - Body ground Cable disconnected from negative (-) auxiliary battery terminal Below 1 Ω
      NOTE:

      Perform this inspection with the wire harness connected to the power distribution box assembly.

    3. Reconnect the cable to the negative (-) auxiliary battery terminal.
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      MB-26 (BECU) - Body ground Ignition switch off 11 to 14 V
      NOTE:

      Perform this inspection with the wire harness connected to the power distribution box assembly.

      Result

      Result Proceed to
      OK A
      NG (BECU) B
      NG (GND1 or GND2) C

    Result: 

    A 

    CHECK ECU POWER SOURCE CIRCUIT 

    Refer to IG Signal Circuit [09/2022 - 11/2022]

    Result: 

    C 

    See step  4

    Result: 

    B 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (BECU SIGNAL CIRCUIT) 
    1. Disconnect the cable from the negative (-) auxiliary battery terminal.
    2. Disconnect the 8F power distribution box assembly connector.
    3. Reconnect the cable to the negative (-) auxiliary battery terminal.
    4. Measure the voltage according to the value(s) in the table below.
      GTY1110526Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Power Distribution Box Assembly)

      Standard Voltage

      Tester Connection Condition Specified Condition
      8F-23 - Body ground Ignition switch off 11 to 14 V

      Result

      Result 
      OK
      NG

    Result: 

    OK 

    REPLACE POWER DISTRIBUTION BOX ASSEMBLY 

    Refer to REMOVAL [09/2022 - 11/2022]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (BECU SIGNAL CIRCUIT) 

  4. CHECK HARNESS AND CONNECTOR (GROUND CIRCUIT) 
    1. Disconnect the cable from the negative (-) auxiliary battery terminal.
    2. Disconnect the 8D power distribution box assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      8D-1 - Body ground Cable disconnected from negative (-) auxiliary battery terminal Below 1 Ω
      GTY1113552Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Power Distribution Box Assembly)

      Result

      Result 
      OK
      NG

    Result: 

    OK 

    REPLACE POWER DISTRIBUTION BOX ASSEMBLY 

    Refer to REMOVAL [09/2022 - 11/2022]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND CIRCUIT) 

scientia non olet · About LEMON Manuals