CAN COMMUNICATION SYSTEM(for LHD), Diagnostic DTC:U0131

DTC Code DTC Name
U0131 Lost Communication with Power Steering Control Module

DESCRIPTION

DTC Code DTC Detection Condition Trouble Area
U0131 There is no communication from the power steering ECU assembly.

  • Power source circuit of power steering ECU assembly

  • Power steering ECU assembly CAN branch wire or connector

  • Power steering ECU assembly

WIRING DIAGRAM

A01X8SVE05
*a No. 4 Junction Connector
*b ECU-IG No. 2
*c from IG1 NO. 3 Relay
*d Power Steering ECU Assembly

CAUTION / NOTICE / HINT

Note

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

Tech Tips

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

PROCEDURE


  1. PRECAUTION

    Note

    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.


    NEXT

  2. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL


    1. Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the CAN main wire and the CAN branch wire.

      CAUTION:

      For vehicles with an SRS system:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

      Note

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


    NEXT

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


    1. A01X1DME01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Power Steering ECU assembly)

      Disconnect the E102 power steering ECU assembly connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      E102-1 (CANH) - E102-2 (CANL) Ignition switch off 54 to 69 Ω

    NG

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

    OK

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


    1. A01X3PFE01
      Text in Illustration
      *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 here.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      E102-5 (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
      E102-3 (GND) - Body ground Always Below 1 Ω

    OK

    REPLACE POWER STEERING ECU ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR