CAN COMMUNICATION SYSTEM(for LHD with Central Gateway ECU) Parking Assist ECU Communication Stop Mode

DESCRIPTION

Detection Item Symptom Trouble Area
Parking Assist ECU Communication Stop Mode

Either condition is met:


  • "Parking Assist Monitor System" is not displayed on "CAN Bus Check".

    Click here

  • Communication system DTCs (DTCs that start with U) that are output correspond to "Parking Assist ECU Communication Stop Mode" in "DTC Combination Table".

    Click here


  • Power source circuit of parking assist ECU

  • Parking assist ECU CAN branch wire or connector

  • Parking assist ECU

WIRING DIAGRAM

A01V6U2E05

CAUTION / NOTICE / HINT

Note


  • Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output.

    Click here

  • Before measuring the resistance of the CAN bus, turn the ignition switch off and leave the vehicle for 1 minute or more without operating the key, switches or opening or closing the doors. After that, disconnect the cable from the negative (-) battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.

  • After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work.

    Click here

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

  • After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.

  • DTC check procedure: Turn the ignition switch to ON and wait at least 20 seconds.

  • After the repair, perform CAN Bus Check and check that all the ECUs and sensors connected to the CAN communication system are displayed.

    Click here

Tech Tips


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

  • Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.

PROCEDURE


  1. CHECK FOR OPEN IN CAN BUS WIRE (PARKING ASSIST ECU CAN BRANCH WIRE)


    1. A01V7UBC18
      *a

      Front view of wire harness connector

      (to Parking Assist ECU)

      Disconnect the cable from the negative (-) battery terminal.

    2. Disconnect the parking assist ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      a2-12 (CANH) - a2-13 (CANL) Cable disconnected from negative (-) battery terminal 54 to 69 Ω
      Result
      Result Proceed to
      OK (w/o Stop and Start System) A
      OK (w/ Stop and Start System) B
      NG C

    B

    CHECK HARNESS AND CONNECTOR (PARKING ASSIST ECU - BATTERY AND BODY GROUND) Click here

    C

    REPAIR OR REPLACE PARKING ASSIST ECU CAN BRANCH WIRE OR CONNECTOR (CANH, CANL)

    A

  2. CHECK HARNESS AND CONNECTOR (PARKING ASSIST ECU - BATTERY AND BODY GROUND)


    1. A01V82UC02
      *a

      Front view of wire harness connector

      (to Parking Assist ECU)

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

      Note

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

      Click here

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      a2-2 (+B) - Body ground Always 11 to 14 V
      a2-1 (ACC) - Body ground Ignition switch ACC 11 to 14 V
      a2-6 (IG) - Body ground Ignition switch ON 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      a2-3 (GND1) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE PARKING ASSIST ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  3. CHECK HARNESS AND CONNECTOR (PARKING ASSIST ECU - BATTERY AND BODY GROUND)


    1. A01V82UC02
      *a

      Front view of wire harness connector

      (to Parking Assist ECU)

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

      Note

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

      Click here

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      a2-2 (+B) - Body ground Always 10.5 to 16 V
      a2-1 (ACC) - Body ground Ignition switch ACC 10.5 to 16 V
      a2-6 (IG) - Body ground Ignition switch ON 10.5 to 16 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      a2-3 (GND1) - Body ground Always Below 1 Ω
      Result
      Result Proceed to
      OK A
      NG (Except GND1 terminals) B
      NG (GND1 terminal) C

    A

    REPLACE PARKING ASSIST ECU Click here

    B

    GO TO STOP AND START SYSTEM for 2WW: GO TO STOP AND START SYSTEM Click here
    GO TO STOP AND START SYSTEM for 3ZR-FAE: GO TO STOP AND START SYSTEM Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR