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Power Steering ECU Communication Stop Mode [11/2017 - ]: Procedure

  1. CHECK VEHICLE TYPE 
    1. Check vehicle type.

      Result

      Result Proceed to
      w/o VGRS System A
      w/ VGRS System B

    Result: 

    B 

    See step  4

    Result: 

    A 

    See step  2

  2. CHECK FOR OPEN IN CAN BUS 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.
    3. Measure the resistance according to the value(s) in the table below.
      GTY793002Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Power Steering ECU Assembly)

      Standard Resistance

      Tester Connection Condition Specified Condition
      A18-3 (CA1H) - A18-2 (CA1L) 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.
      GTY831192Courtesy 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.

      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) 

  4. CHECK FOR OPEN IN CAN BUS 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.
    3. Measure the resistance according to the value(s) in the table below.
      GTY793003Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Power Steering ECU Assembly)

      Standard Resistance

      Tester Connection Condition Specified Condition
      A18-3 (CA1H) - A18-2 (CA1L) Cable disconnected from negative (-) battery terminal 54 to 69 Ω
      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  5

  5. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) 
    1. Measure the resistance according to the value(s) in the table below.
      GTY831192Courtesy 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.

      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) 

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