CAN COMMUNICATION SYSTEM(for RHD) 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".

    Click here

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

    Click here


  • Power source circuit of power steering ECU assembly

  • Power steering ECU assembly ground circuit

  • Power steering ECU assembly CAN branch wire or connector

  • Power steering ECU assembly

  • ECU wire sub-assembly

WIRING DIAGRAM

B002H98E01
B002H98E02

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 power 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 (-) auxiliary battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.

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

    Click here

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

  • DTC check procedure: Turn the power switch on (IG) 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.

    Click here

Tech Tips


  • Operating the power 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 VEHICLE TYPE


    1. Check vehicle type.

      Result
      Result Proceed to
      for Power Tilt and Power Telescopic Steering Column A
      for Manual Tilt and Manual Telescopic Steering Column B

    B

    CHECK FOR OPEN IN CAN BUS WIRE (POWER STEERING ECU ASSEMBLY BRANCH WIRE) Click here

    A

  2. CHECK FOR OPEN IN CAN BUS WIRE (POWER STEERING ECU ASSEMBLY BRANCH WIRE)


    1. B002JNHC29
      *a

      Front view of wire harness connector

      (to Power Steering ECU Assembly)

      Disconnect the cable from the negative (-) auxiliary 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
      n2-7 (CANH) - n2-8 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω
      Result
      Proceed to
      OK
      NG

    NG

    CHECK FOR OPEN IN CAN BUS WIRE (POWER STEERING ECU ASSEMBLY BRANCH WIRE) Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (AUXILIARY BATTERY - ECU WIRE SUB-ASSEMBLY)


    1. B002J17C01
      *a

      Front view of wire harness connector

      (to ECU Wire Sub-assembly)

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

      Note

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

      Click here

    2. Disconnect the ECU wire sub-assembly connectors.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      nl1-5 (IG) - Body ground Power switch on (IG) 8 to 16 V
      An1-1 (PIG) - Body ground Power switch off 9 to 16 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK ECU WIRE SUB-ASSEMBLY


    1. B002JYMC01
      *a

      Front view of wire harness connector

      (to Power Steering ECU Assembly)

      Reconnect the ECU wire sub-assembly connectors.

    2. Disconnect the power steering ECU assembly connectors.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      n2-1 (IG) - Body ground Power switch on (IG) 8 to 16 V
      n1-1 (PIG) - Body ground Power switch off 9 to 16 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      n1-2 (PGND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE POWER STEERING ECU ASSEMBLY Click here

    NG

    REPLACE ECU WIRE SUB-ASSEMBLY Click here

  5. CHECK FOR OPEN IN CAN BUS WIRE (POWER STEERING ECU ASSEMBLY BRANCH WIRE)


    1. B002J8EC05
      *a

      Front view of wire harness connector

      (to Power Steering ECU Assembly)

      Disconnect the ECU wire sub-assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      nl1-1 (CANH) - nl1-2 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ECU WIRE SUB-ASSEMBLY Click here

    NG

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

  6. CHECK FOR OPEN IN CAN BUS WIRE (POWER STEERING ECU ASSEMBLY BRANCH WIRE)


    1. B002KXTC01
      *a

      Front view of wire harness connector

      (to Power Steering ECU Assembly)

      Disconnect the cable from the negative (-) auxiliary 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
      n3-4 (CANH) - n3-8 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω
      Result
      Proceed to
      OK
      NG

    NG

    CHECK FOR OPEN IN CAN BUS WIRE (POWER STEERING ECU ASSEMBLY BRANCH WIRE) Click here

    OK

  7. CHECK HARNESS AND CONNECTOR (AUXILIARY BATTERY - ECU WIRE SUB-ASSEMBLY)


    1. B002J17C01
      *a

      Front view of wire harness connector

      (to ECU Wire Sub-assembly)

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

      Note

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

      Click here

    2. Disconnect the ECU wire sub-assembly connectors.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      nl1-5 (IG) - Body ground Power switch on (IG) 8 to 16 V
      An1-1 (PIG) - Body ground Power switch off 9 to 16 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. CHECK ECU WIRE SUB-ASSEMBLY


    1. B002KP6C01
      *a

      Front view of wire harness connector

      (to Power Steering ECU Assembly)

      Reconnect the ECU wire sub-assembly connectors.

    2. Disconnect the power steering ECU assembly connectors.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      n3-1 (IG) - Body ground Power switch on (IG) 8 to 16 V
      n1-1 (PIG) - Body ground Power switch off 9 to 16 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      n1-2 (PGND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE POWER STEERING ECU ASSEMBLY Click here

    NG

    REPLACE ECU WIRE SUB-ASSEMBLY Click here

  9. CHECK FOR OPEN IN CAN BUS WIRE (POWER STEERING ECU ASSEMBLY BRANCH WIRE)


    1. B002J8EC05
      *a

      Front view of wire harness connector

      (to Power Steering ECU Assembly)

      Disconnect the ECU wire sub-assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      nl1-1 (CANH) - nl1-2 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ECU WIRE SUB-ASSEMBLY Click here

    NG

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