CAN COMMUNICATION SYSTEM(for LHD without Central Gateway ECU) Power Steering ECU Communication Stop Mode

DTC Code DTC Name
Power Steering ECU Communication Stop Mode

DESCRIPTION

Detection Item

Symptoms

Trouble Area

Power Steering ECU Communication Stop Mode

Either condition is met:

  • "Power Steering (EPS)" is not displayed on "CAN Bus Check".

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

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  • Power source or inside power steering ECU assembly

  • Power steering ECU assembly CAN branch wire or connector

  • Power steering ECU assembly

WIRING DIAGRAM

C334650E02

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 hereClick here

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

  • DTC check procedure: Turn the ignition switch to ON and wait at least 12 seconds.

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

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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 (POWER STEERING ECU ASSEMBLY CAN BRANCH WIRE)

    1. C268317C01

      *a

      Rear view of wire harness connector

      (to Power Steering ECU Assembly)

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

    2. Disconnect the power steering ECU assembly connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      h1-4 (CANH) - h1-8 (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 (POWER STEERING ECU ASSEMBLY - BATTERY AND BODY GROUND)Click here

    C

    REPAIR OR REPLACE POWER STEERING ECU ASSEMBLY CAN BRANCH WIRE OR CONNECTOR (CANH, CANL)

    A

  2. CHECK HARNESS AND CONNECTOR (POWER STEERING ECU ASSEMBLY - BATTERY AND BODY GROUND)

    1. C280375C01

      *a

      Front view of wire harness connector

      (to Power Steering ECU Assembly)

      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 hereClick here

    2. Disconnect the power steering ECU assembly connector.

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      h1-1 (IG) - Body ground

      Ignition switch ON

      11 to 14 V

      h2-1 (PIG) - Body ground

      Always

      11 to 14 V

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      h2-2 (PGND) - Body ground

      Always

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE POWER STEERING ECU ASSEMBLY

    Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  3. CHECK HARNESS AND CONNECTOR (POWER STEERING ECU ASSEMBLY - BATTERY AND BODY GROUND)

    1. C280375C01

      *a

      Front view of wire harness connector

      (to Power Steering ECU Assembly)

      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 hereClick here

    2. Disconnect the power steering ECU assembly connector.

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      h1-1 (IG) - Body ground

      Ignition switch ON

      10.5 to 16 V

      h2-1 (PIG) - Body ground

      Always

      11 to 14 V

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      h2-2 (PGND) - Body ground

      Always

      Below 1 Ω

    Result

    Result

    Result

    Proceed to

    OK

    A

    NG (IG terminal)

    B

    NG (Except IG terminals)

    C
    A

    REPLACE POWER STEERING ECU ASSEMBLY

    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