CAN COMMUNICATION SYSTEM ABS and Traction Actuator (Skid Control ECU) Communication Stop Mode

DESCRIPTION

Detection Item Symptom Trouble Area
Brake Actuator (VSC ECU) Communication Stop Mode

Either condition is met:


  • "ABS/VSC/TRAC" is not displayed on "Bus Check".

  • "Brake Actuator (VSC ECU) Communication Stop Mode" in "DTC Combination Table" applies.

  • Power source or inside brake actuator assembly (VSC ECU)

  • Brake actuator assembly (VSC ECU) branch wire or connector

  • Brake actuator assembly (VSC ECU)

WIRING DIAGRAM

A005U6JE07

INSPECTION PROCEDURE

Note

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

Tech Tips

Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

PROCEDURE


  1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL


    1. Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the main wire and the branch wire.

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

      Note


      • w/ Navigation System (for HDD):

        After the ignition switch is turned off, the HDD navigation system requires approximately a minute to record various types of memory and settings. As a result, after turning the ignition switch off, wait a minute or more before disconnecting the cable from the negative (-) battery terminal.

      • When disconnecting the cable, some systems need to be initialized after the cable is reconnected Click here.


    NEXT

  2. CHECK OPEN IN CAN BUS WIRE (BRAKE ACTUATOR BRANCH WIRE)

    A005WCLE01
    Text in Illustration
    *1 for Automatic Transaxle and Manual Transaxle
    *2 for CVT
    *3

    Front view of wire harness connector

    (to Brake Actuator Assembly)

    1. Disconnect the A42*1 or A43*2 brake actuator assembly (VSC ECU) connector.


      • *1: for Automatic Transaxle and Manual Transaxle

      • *2: for CVT

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

      Standard Resistance
      for Automatic Transaxle and Manual Transaxle
      Tester Connection Switch Condition Specified Condition
      A42-35 (CANH) - A42-14 (CANL) Ignition switch off 54 to 69 Ω
      for CVT
      Tester Connection Switch Condition Specified Condition
      A43-35 (CANH) - A43-14 (CANL) Ignition switch off 54 to 69 Ω

    NG

    REPAIR OR REPLACE BRAKE ACTUATOR BRANCH WIRE OR CONNECTOR (CANH, CANL)

    OK

  3. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR - BATTERY AND BODY GROUND)


    1. Connect the cable to the negative (-) battery terminal.

      Note

      When this connecting the cable, some systems need to be initialized after the cable is reconnected Click here.

    2. A005WCLE02
      Text in Illustration
      *1 for Automatic Transaxle and Manual Transaxle
      *2 for CVT
      *3

      Front view of wire harness connector

      (to Brake Actuator Assembly)

      Disconnect the A42*1 or A43*2 brake actuator assembly (VSC ECU) connector.


      • *1: for Automatic Transaxle and Manual Transaxle

      • *2: for CVT

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

      Standard Resistance
      for Automatic Transaxle and Manual Transaxle
      Tester Connection Condition Specified Condition
      A42-1 (GND2) - Body ground Always Below 1 Ω
      A42-4 (GND1) - Body ground Always Below 1 Ω
      for CVT
      Tester Connection Condition Specified Condition
      A43-1 (GND2) - Body ground Always Below 1 Ω
      A43-4 (GND1) - Body ground Always Below 1 Ω

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

      Standard Voltage
      for Automatic Transaxle and Manual Transaxle
      Tester Connection Switch Condition Specified Condition
      A42-2 (+BM) - Body ground Always 11 to 14 V
      A42-3 (+BS) - Body ground Always 11 to 14 V
      A42-28 (IG1) - Body ground Ignition switch ON 11 to 14 V
      for CVT
      Tester Connection Switch Condition Specified Condition
      A43-2 (+BM) - Body ground Always 11 to 14 V
      A43-3 (+BS) - Body ground Always 11 to 14 V
      A43-28 (IG1) - Body ground Ignition switch ON 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE BRAKE ACTUATOR ASSEMBLY (VSC ECU) Click here