CAN COMMUNICATION SYSTEM(w/o Central Gateway ECU) Clearance Warning ECU Communication Stop Mode

DTC Code DTC Name
Clearance Warning ECU Communication Stop Mode

DESCRIPTION

Detection Item

Symptom

Trouble Area

Clearance Warning ECU Communication Stop Mode

Either condition is met:

  • Clearance warning ECU assembly branch line or connector

  • Power source circuit of clearance warning ECU assembly

  • Clearance warning ECU assembly ground circuit

  • Clearance warning ECU assembly

WIRING DIAGRAM

C275686E04
C275700E04
C275686E05

CAUTION / NOTICE / HINT

Note:

  • 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 or any 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 negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

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  • 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.

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  • 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, and then drive the vehicle at a speed of 20 km/h (12 mph) or more.

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

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

Tip:

  • Operating the ignition switch, any other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.

  • 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 LINES (CLEARANCE WARNING ECU ASSEMBLY BRANCH LINE)

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

    2. C240532C27

      *a

      Front view of wire harness connector

      (to Clearance Warning ECU Assembly)

      Disconnect the E98 clearance warning ECU assembly connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      E98-29 (R1) - E98-28 (R2)

      Cable disconnected from negative (-) battery terminal

      54 to 69 Ω

    Result

    Result

    OK

    NG
    NG

    REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (CLEARANCE WARNING ECU ASSEMBLY)

    OK

  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

    1. C240532C28

      *a

      Front view of wire harness connector

      (to Clearance Warning ECU Assembly)

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      E98-16 (E) - Body ground

      Cable disconnected from negative (-) battery terminal

      Below 1 Ω

    2. Reconnect the cable to the negative (-) battery terminal.

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      H98-18 (IG) - Body ground

      Ignition switch ON

      11 to 14 V

    Result

    Result

    Proceed to

    OK (for LHD)

    A

    OK (for RHD)

    B

    • NG (for ground circuit)

    • NG (for IG signal circuit (w/o Stop and start system))

    C

    NG (for IG signal circuit (w/ Stop and start system))

    D
    A

    REPLACE CLEARANCE WARNING ECU ASSEMBLY

    B

    REPLACE CLEARANCE WARNING ECU ASSEMBLY

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    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

    D

    GO TO STOP AND START SYSTEM (FOR BACKUP BOOST CONVERTER CIRCUIT)

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