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Home >> Toyota >> 2024 >> Corolla LE >> Repair and Diagnosis >> External Pages >> Different car >> Section 321 (Can Communication System (Except HEV) (Early 2023, TMC) - Circuit Tests (1 Of 4) & Diagnostic Codes) >> CAN COMMUNICATION SYSTEM (for Gasoline Model TMC Made) >> DTC U115C-87: Lost Communication with ECM/PCM "A" (ch5) Missing Message [09/2022 - 11/2022] >> Procedure

DTC U115C-87: Lost Communication with ECM/PCM "A" (ch5) Missing Message [09/2022 - 11/2022]: Procedure

WARNING: This page is about a different car, the 2023 Toyota GR Corolla and 2023 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK VEHICLE TYPE 
    1. Check vehicle type.

      Result

      Result Proceed to
      except G16E-GTS A
      for G16E-GTS B

    Result: 

    B 

    See step  22

    Result: 

    A 

    See step  2

  2. CHECK FOR OPEN IN CAN MAIN BUS LINES 
    1. Disconnect the cable from the negative (-) battery terminal.
    2. Measure the resistance according to the value(s) in the table below.
      GTY1117847Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (No. 11 CAN Junction Connector)      		 - -

      Standard Resistance

      Tester Connection Condition Specified Condition
      A147-2 (CANH) - A147-13 (CANL) Cable disconnected from negative (-) battery terminal Below 70 Ω

      Result

      Result
      OK
      NG

    Result: 

    NG 

    See step  18

    Result: 

    OK 

    See step  3

  3. CHECK FOR SHORT IN CAN BUS LINES 
    1. Measure the resistance according to the value(s) in the table below.
      GTY1117847Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (No. 11 CAN Junction Connector)      		 - -

      Standard Resistance

      Tester Connection Condition Specified Condition
      A147-2 (CANH) - A147-13 (CANL) Cable disconnected from negative (-) battery terminal 54 Ω or higher

      Result

      Result
      OK
      NG

    Result: 

    NG 

    See step  14

    Result: 

    OK 

    See step  4

  4. CHECK FOR SHORT TO +B IN CAN BUS LINE 
    1. Measure the resistance according to the value(s) in the table below.
      GTY1117064Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 DLC3 - -
      *a Component with harness connected
      (No. 11 CAN Junction Connector)      		 - -

      Standard Resistance

      Tester Connection Condition Specified Condition
      A147-2 (CANH) - I26-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      A147-13 (CANL) - I26-16 (BAT)

      Result

      Result
      OK
      NG

    Result: 

    NG 

    See step  10

    Result: 

    OK 

    See step  5

  5. CHECK FOR SHORT TO GND IN CAN BUS LINE 
    1. Measure the resistance according to the value(s) in the table below.
      GTY1117065Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 DLC3 - -
      *a Component with harness connected
      (No. 11 CAN Junction Connector)      		 - -

      Standard Resistance

      Tester Connection Condition Specified Condition
      A147-2 (CANH) - I26-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      A147-13 (CANL) - I26-4 (CG)

      Result

      Result
      OK
      NG

    Result: 

    OK 

    INSPECT FOR INTERMITTENT PROBLEMS 

    Refer to HOW TO PROCEED WITH TROUBLESHOOTING [06/2018 - ]

    Result: 

    NG 

    See step  6

  6. CHECK FOR SHORT TO GND IN CAN BUS LINE (NO. 11 CAN JUNCTION CONNECTOR - BRAKE ACTUATOR ASSEMBLY) 
    1. Disconnect the A147 No. 11 CAN junction connector.
    2. Measure the resistance according to the value(s) in the table below.
      GTY1118484Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 DLC3 - -
      *a Front view of wire harness connector
      (to No. 11 CAN Junction Connector)      		 *b to Brake Actuator Assembly

      Standard Resistance

      Tester Connection Condition Specified Condition
      A147-2 (CANH) - I26-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      A147-13 (CANL) - I26-4 (CG)

      Result

      Result
      OK
      NG

    Result: 

    NG 

    See step  8

    Result: 

    OK 

    See step  7

  7. CHECK FOR SHORT TO GND IN CAN BUS LINE (NO. 11 CAN JUNCTION CONNECTOR - ECM) 
    1. Measure the resistance according to the value(s) in the table below.
      GTY1113214Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 DLC3 - -
      *a Front view of wire harness connector
      (to No. 11 CAN Junction Connector)      		 *b to ECM

      Standard Resistance

      Tester Connection Condition Specified Condition
      A147-1 (CANH) - I26-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      A147-12 (CANL) - I26-4 (CG)

      Result

      Result
      OK
      NG

    Result: 

    OK 

    REPLACE NO. 11 CAN JUNCTION CONNECTOR 

    Result: 

    NG 

    See step  9

  8. CHECK FOR SHORT TO GND IN CAN BUS LINE (NO. 11 CAN JUNCTION CONNECTOR - BRAKE ACTUATOR ASSEMBLY) 
    1. Disconnect the A51 brake actuator assembly connector.
    2. Measure the resistance according to the value(s) in the table below.
      GTY1118484Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 DLC3 - -
      *a Front view of wire harness connector
      (to No. 11 CAN Junction Connector)      		 *b to Brake Actuator Assembly

      Standard Resistance

      Tester Connection Condition Specified Condition
      A147-2 (CANH) - I26-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      A147-13 (CANL) - I26-4 (CG)

      Result

      Result
      OK
      NG

    Result: 

    OK 

    REPLACE BRAKE ACTUATOR ASSEMBLY 

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

    Result: 

    NG 

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 11 CAN JUNCTION CONNECTOR - BRAKE ACTUATOR ASSEMBLY) 

  9. CHECK FOR SHORT TO GND IN CAN BUS LINE (NO. 11 CAN JUNCTION CONNECTOR - ECM) 
    1. Disconnect the A47 ECM connector.
    2. Measure the resistance according to the value(s) in the table below.
      GTY1113214Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 DLC3 - -
      *a Front view of wire harness connector
      (to No. 11 CAN Junction Connector)      		 *b to ECM

      Standard Resistance

      Tester Connection Condition Specified Condition
      A147-1 (CANH) - I26-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      A147-12 (CANL) - I26-4 (CG)

      Result

      Result
      OK
      NG

    Result: 

    OK 

    REPLACE ECM 

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

    Result: 

    NG 

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 11 CAN JUNCTION CONNECTOR - ECM) 

  10. CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 11 CAN JUNCTION CONNECTOR - BRAKE ACTUATOR ASSEMBLY) 
    1. Disconnect the A147 No. 11 CAN junction connector.
    2. Measure the resistance according to the value(s) in the table below.
      GTY1113215Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 DLC3 - -
      *a Front view of wire harness connector
      (to No. 11 CAN Junction Connector)      		 *b to Brake Actuator Assembly

      Standard Resistance

      Tester Connection Condition Specified Condition
      A147-2 (CANH) - I26-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      A147-13 (CANL) - I26-16 (BAT)

      Result

      Result
      OK
      NG

    Result: 

    NG 

    See step  12

    Result: 

    OK 

    See step  11

  11. CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 11 CAN JUNCTION CONNECTOR - ECM) 
    1. Measure the resistance according to the value(s) in the table below.
      GTY1113233Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 DLC3 - -
      *a Front view of wire harness connector
      (to No. 11 CAN Junction Connector)      		 *b to ECM

      Standard Resistance

      Tester Connection Condition Specified Condition
      A147-1 (CANH) - I26-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      A147-12 (CANL) - I26-16 (BAT)

      Result

      Result
      OK
      NG

    Result: 

    OK 

    REPLACE NO. 11 CAN JUNCTION CONNECTOR 

    Result: 

    NG 

    See step  13

  12. CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 11 CAN JUNCTION CONNECTOR - BRAKE ACTUATOR ASSEMBLY) 
    1. Disconnect the A51 brake actuator assembly connector.
    2. Measure the resistance according to the value(s) in the table below.
      GTY1113232Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 DLC3 - -
      *a Front view of wire harness connector
      (to No. 11 CAN Junction Connector)      		 *b to Brake Actuator Assembly

      Standard Resistance

      Tester Connection Condition Specified Condition
      A147-2 (CANH) - I26-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      A147-13 (CANL) - I26-16 (BAT)

      Result

      Result
      OK
      NG

    Result: 

    OK 

    REPLACE BRAKE ACTUATOR ASSEMBLY 

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

    Result: 

    NG 

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 11 CAN JUNCTION CONNECTOR - BRAKE ACTUATOR ASSEMBLY) 

  13. CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 11 CAN JUNCTION CONNECTOR - ECM) 
    1. Disconnect the A47 ECM connector.
    2. Measure the resistance according to the value(s) in the table below.
      GTY1113233Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 DLC3 - -
      *a Front view of wire harness connector
      (to No. 11 CAN Junction Connector)      		 *b to ECM

      Standard Resistance

      Tester Connection Condition Specified Condition
      A147-1 (CANH) - I26-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      A147-12 (CANL) - I26-16 (BAT)

      Result

      Result
      OK
      NG

    Result: 

    OK 

    REPLACE ECM 

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

    Result: 

    NG 

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 11 CAN JUNCTION CONNECTOR - ECM) 

  14. CHECK FOR SHORT IN CAN BUS LINES (NO. 11 CAN JUNCTION CONNECTOR - BRAKE ACTUATOR ASSEMBLY) 
    1. Disconnect the A147 No. 11 CAN junction connector.
    2. Measure the resistance according to the value(s) in the table below.
      GTY1113874Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 11 CAN Junction Connector)      		 *b to Brake Actuator Assembly

      Standard Resistance

      Tester Connection Condition Specified Condition
      A147-2 (CANH) - A147-13 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

      Result

      Result 
      OK
      NG

    Result: 

    NG 

    See step  16

    Result: 

    OK 

    See step  15

  15. CHECK FOR SHORT IN CAN BUS LINES (NO. 11 CAN JUNCTION CONNECTOR - ECM) 
    1. Measure the resistance according to the value(s) in the table below.
      GTY1113873Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 11 CAN Junction Connector)      		 *b to ECM

      Standard Resistance

      Tester Connection Condition Specified Condition
      A147-1 (CANH) - A147-12 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

      Result

      Result
      OK
      NG

    Result: 

    OK 

    REPLACE NO. 11 CAN JUNCTION CONNECTOR 

    Result: 

    NG 

    See step  17

  16. CHECK FOR SHORT IN CAN BUS LINES (NO. 11 CAN JUNCTION CONNECTOR - BRAKE ACTUATOR ASSEMBLY) 
    1. Disconnect the A51 brake actuator assembly connector.
    2. Measure the resistance according to the value(s) in the table below.
      GTY1113874Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 11 CAN Junction Connector)      		 *b to Brake Actuator Assembly

      Standard Resistance

      Tester Connection Condition Specified Condition
      A147-2 (CANH) - A147-13 (CANL) Cable disconnected from negative (-) battery terminal 1 MΩ or higher

      Result

      Result
      OK
      NG

    Result: 

    OK 

    REPLACE BRAKE ACTUATOR ASSEMBLY 

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

    Result: 

    NG 

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 11 CAN JUNCTION CONNECTOR - BRAKE ACTUATOR ASSEMBLY) 

  17. CHECK FOR SHORT IN CAN BUS LINES (NO. 11 CAN JUNCTION CONNECTOR - ECM) 
    1. Disconnect the A47 ECM connector.
    2. Measure the resistance according to the value(s) in the table below.
      GTY1113873Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 11 CAN Junction Connector)      		 *b to ECM

      Standard Resistance

      Tester Connection Condition Specified Condition
      A147-1 (CANH) - A147-12 (CANL) Cable disconnected from negative (-) battery terminal 1 MΩ or higher

      Result

      Result
      OK
      NG

    Result: 

    OK 

    REPLACE ECM 

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

    Result: 

    NG 

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 11 CAN JUNCTION CONNECTOR - ECM) 

  18. CHECK FOR OPEN IN CAN MAIN BUS LINES (NO. 11 CAN JUNCTION CONNECTOR) 
    1. Disconnect the A147 No. 11 CAN junction connector.
    2. Measure the resistance according to the value(s) in the table below.
      GTY1113874Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 11 CAN Junction Connector)      		 *b to Brake Actuator Assembly

      Standard Resistance

      Tester Connection Condition Specified Condition
      A147-2 (CANH) - A147-13 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

      Result

      Result 
      OK
      NG

    Result: 

    NG 

    See step  20

    Result: 

    OK 

    See step  19

  19. CHECK FOR OPEN IN CAN MAIN BUS LINES (NO. 11 CAN JUNCTION CONNECTOR - ECM) 
    1. Measure the resistance according to the value(s) in the table below.
      GTY1113873Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 11 CAN Junction Connector)      		 *b to ECM

      Standard Resistance

      Tester Connection Condition Specified Condition
      A147-1 (CANH) - A147-12 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

      Result

      Result
      OK
      NG

    Result: 

    OK 

    REPLACE NO. 11 CAN JUNCTION CONNECTOR 

    Result: 

    NG 

    See step  21

  20. CHECK FOR OPEN IN CAN MAIN BUS LINES (NO. 11 CAN JUNCTION CONNECTOR - BRAKE ACTUATOR ASSEMBLY) 
    1. Reconnect the A147 No. 11 CAN junction connector.
    2. Disconnect the A51 brake actuator assembly connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY1116530Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Brake Actuator Assembly)

      Standard Resistance

      Tester Connection Condition Specified Condition
      A51-11 (CA2H) - A51-25 (CA2L) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

      Result

      Result
      OK
      NG

    Result: 

    OK 

    REPLACE BRAKE ACTUATOR ASSEMBLY 

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

    Result: 

    NG 

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 11 CAN JUNCTION CONNECTOR - BRAKE ACTUATOR ASSEMBLY) 

  21. CHECK FOR OPEN IN CAN MAIN BUS LINES (NO. 11 CAN JUNCTION CONNECTOR - ECM) 
    1. Reconnect the A147 No. 11 CAN junction connector.
    2. Disconnect the A47 ECM connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A47-7 (CAN+) - A47-17 (CAN-) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      GTY1118024Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to ECM)

      Result

      Result
      OK
      NG

    Result: 

    OK 

    REPLACE ECM 

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

    Result: 

    NG 

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 11 CAN JUNCTION CONNECTOR - ECM) 

  22. CHECK FOR OPEN IN CAN MAIN BUS LINES 
    1. Disconnect the cable from the negative (-) battery terminal.
    2. Disconnect the A140 brake actuator assembly connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY1114452Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Brake Actuator Assembly)

      Standard Resistance

      Tester Connection Condition Specified Condition
      A140-16 (CA2H) - A140-17 (CA2L) Cable disconnected from negative (-) battery terminal Below 133 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  33

    Result: 

    OK 

    See step  23

  23. CHECK FOR SHORT IN CAN BUS LINES 
    1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A140-16 (CA2H) - A140-17 (CA2L) Cable disconnected from negative (-) battery terminal 108 Ω or higher
      GTY1114452Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Brake Actuator Assembly)

      Result

      Result
      OK
      NG

    Result: 

    NG 

    See step  32

    Result: 

    OK 

    See step  24

  24. CHECK FOR SHORT TO +B IN CAN BUS LINE 
    1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A140-16 (CA2H) - A140-14 (+BS) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      A140-17 (CA2L) - A140-14 (+BS)
      GTY1114454Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Brake Actuator Assembly)

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  31

    Result: 

    OK 

    See step  25

  25. CHECK FOR SHORT TO GND IN CAN BUS LINE 
    1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A140-16 (CA2H) - A140-1 (GND1) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      A140-17 (CA2L) - A140-1 (GND1)
      GTY1118747Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Brake Actuator Assembly)

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  30

    Result: 

    OK 

    See step  26

  26. CHECK FOR OPEN IN CAN MAIN BUS LINES (ECM) 
    1. Reconnect the A140 brake actuator assembly connector.
    2. Disconnect the A139 ECM connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY1112187Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to ECM)      		 - -

      Standard Resistance

      Tester Connection Condition Specified Condition
      A139-25 (CANU) - A139-26 (CAND) Cable disconnected from negative (-) battery terminal Below 133 Ω

      Result

      Proceed to 
      OK
      NG

    Result: 

    NG 

    REPLACE BRAKE ACTUATOR ASSEMBLY 

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

    Result: 

    OK 

    See step  27

  27. CHECK FOR SHORT IN CAN BUS LINES (ECM - BRAKE ACTUATOR ASSEMBLY) 
    1. Measure the resistance according to the value(s) in the table below.
      GTY1112187Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to ECM)      		 - -

      Standard Resistance

      Tester Connection Condition Specified Condition
      A139-25 (CANU) - A139-26 (CAND) Cable disconnected from negative (-) battery terminal 108 Ω or higher

      Result

      Proceed to 
      OK
      NG

    Result: 

    NG 

    REPLACE BRAKE ACTUATOR ASSEMBLY 

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

    Result: 

    OK 

    See step  28

  28. CHECK FOR SHORT TO +B IN CAN BUS LINE (ECM - BRAKE ACTUATOR ASSEMBLY) 
    1. Measure the resistance according to the value(s) in the table below.
      GTY1112188Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to ECM)      		 - -

      Standard Resistance

      Tester Connection Condition Specified Condition
      A139-25 (CANU) - A139-1 (BATT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      A139-26 (CAND) - A139-1 (BATT)

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE BRAKE ACTUATOR ASSEMBLY 

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

    Result: 

    OK 

    See step  29

  29. CHECK FOR SHORT TO GND IN CAN BUS LINE (BRAKE ACTUATOR ASSEMBLY - ECM) 
    1. Measure the resistance according to the value(s) in the table below.
      GTY1112190Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to ECM)      		 - -

      Standard Resistance

      Tester Connection Condition Specified Condition
      A139-25 (CANU) - A139-10 (E1) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      A139-26 (CAND) - A139-10 (E1)

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    INSPECT FOR INTERMITTENT PROBLEMS 

    Refer to HOW TO PROCEED WITH TROUBLESHOOTING [06/2018 - ]

    Result: 

    NG 

    REPLACE BRAKE ACTUATOR ASSEMBLY 

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

  30. CHECK FOR SHORT TO GND IN CAN BUS LINE (BRAKE ACTUATOR ASSEMBLY - ECM) 
    1. Disconnect the A139 ECM connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A140-16 (CA2H) - A140-1 (GND1) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      A140-17 (CA2L) - A140-1 (GND1)
      GTY1118747Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Brake Actuator Assembly)

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE ECM 

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

    Result: 

    NG 

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (BRAKE ACTUATOR ASSEMBLY - ECM) 

  31. CHECK FOR SHORT TO +B IN CAN BUS LINE (BRAKE ACTUATOR ASSEMBLY - ECM) 
    1. Disconnect the A139 ECM connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A140-16 (CA2H) - A140-14 (+BS) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      A140-17 (CA2L) - A140-14 (+BS)
      GTY1114454Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Brake Actuator Assembly)

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE ECM 

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

    Result: 

    NG 

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (BRAKE ACTUATOR ASSEMBLY - ECM) 

  32. CHECK FOR SHORT IN CAN BUS LINES (BRAKE ACTUATOR ASSEMBLY - ECM) 
    1. Disconnect the A139 ECM connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A140-16 (CA2H) - A140-17 (CA2L) Cable disconnected from negative (-) battery terminal 1 MΩ or higher
      GTY1114452Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Brake Actuator Assembly)

      Result

      Proceed to 
      OK
      NG

    Result: 

    OK 

    REPLACE ECM 

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

    Result: 

    NG 

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (BRAKE ACTUATOR ASSEMBLY - ECM) 

  33. CHECK FOR OPEN IN CAN MAIN BUS LINES (BRAKE ACTUATOR ASSEMBLY) 
    1. Disconnect the A139 ECM connector.
    2. Measure the resistance according to the value(s) in the table below.
      GTY1118201Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Brake Actuator Assembly)      		 *b Front view of wire harness connector
      (to ECM)

      Standard Resistance

      Tester Connection Condition Specified Condition
      A140-16 (CA2H) - A139-25 (CANU) Cable disconnected from negative (-) battery terminal Below 1 Ω
      A140-17 (CA2L) - A139-26 (CAND) Cable disconnected from negative (-) battery terminal Below 1 Ω

      Result

      Proceed to 
      OK
      NG

    Result: 

    OK 

    REPLACE ECM 

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

    Result: 

    NG 

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (ECM - BRAKE ACTUATOR ASSEMBLY) 

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