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

DTC Code DTC Name
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 indicated on the "Bus Check" screen

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  • 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

C329327E05

CAUTION / NOTICE / HINT

CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

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, wait for 1 minute or more. Then operate the suspected malfunctioning system and drive the vehicle at 60 km/h (37 mph) or more for 5 minutes or more.

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

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Tip:

  • 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. C280345C18

      *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

    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. C343114C02

      *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. C343114C02

      *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

    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:

    Click here

    for 3ZR-FAE:

    Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR