LEMON Manuals: Even more car manuals for everyone
Home >> Lexus >> 2017 >> RC 200t Base >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Communication Devices >> Can Communication System - Diagnostic Codes (1 Of 2) >> Can Communication System >> DTC U0131: Lost Communication with Power Steering Control Module [09/2014 - 11/2017] >> Procedure

DTC U0131: Lost Communication with Power Steering Control Module [09/2014 - 11/2017]: Procedure

  1. RECONFIRM DTC OUTPUT 

    Body Electrical > Gateway > Trouble Codes 

    1. Reconfirm DTCs.

      HINT: 

      If DTC U1002 is output from Gateway of the network gateway ECU, this indicates a sub bus 19 malfunction. Troubleshoot for DTC U1002 and check for malfunctions in sub bus 19.

      Result

      Result Proceed to
      DTC U1002 is not output from network gateway ECU (Techstream display: Gateway) A
      DTC U1002 is output from network gateway ECU (Techstream display: Gateway) B

    Result: 

    B 

    GO TO DIAGNOSTIC PROCEDURE INDICATED BY OUTPUT DTC. Refer to  DTC U1002: Lost Communication with Gateway Module [09/2014 - 11/2017] 

    Result: 

    A 

    See step  2

  2. CHECK FOR OPEN IN SUB BUS 19 LINES (POWER STEERING ECU ASSEMBLY BRANCH LINE) 
    1. Disconnect the cable from the negative (-) battery terminal.
    2. Disconnect the A18 power steering ECU assembly connector.
      GTY501976Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Power Steering ECU Assembly)
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A18-4 (CA3H) - A18-6 (CA3L) Cable disconnected from negative (-) battery terminal 54 to 69 Ω

      Result

      Result
      OK
      NG

    Result: 

    NG 

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

    Result: 

    OK 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) 
    1. Measure the resistance according to the value(s) in the table below.
      GTY501975Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Power Steering ECU Assembly)

      Standard Resistance

      Tester Connection Condition Specified Condition
      A18-9 (PGND) - 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.
      GTY501974Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Power Steering ECU Assembly)

      Standard Voltage

      Tester Connection Condition Specified Condition
      A18-14 (IG) - Body ground Engine switch on (IG) 11 to 14 V

      Result

      Result
      OK
      NG

    Result: 

    OK 

    REPLACE POWER STEERING ECU ASSEMBLY. Refer to  REMOVAL [09/2014 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) 

scientia non olet · About LEMON Manuals