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DTC U1002: Lost Communication with Gateway Module (Network Gateway ECU) [09/2015 - ]: Procedure

  1. PRECAUTION 
    NOTE:

    After turning the engine 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 (Refer to PRECAUTION [09/2015 - ] ).

    Result:  NEXT

    NEXT 

    See step  2

  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.
      WARNING:

      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 (Refer to INITIALIZATION [09/2015 - ] ).

    Result:  NEXT

    NEXT 

    See step  3

  3. CHECK CAN BUS WIRE (CAN MAIN WIRE FOR DISCONNECTION, BUS LINE FOR SHORT CIRCUIT) 
    1. Measure the resistance according to the value(s) in the table below.
      GTY612576Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Switch Condition Specified Condition Resistance: Malfunction
      M4-13 (CA2H) - M4-12 (CA2L) Engine switch off 54 to 69 Ω Below 53 Ω: Short in line
      M4-13 (CA2H) - M4-12 (CA2L) Engine switch off 54 to 69 Ω Higher than 70 Ω: Open in CAN main bus line
      M4-13 (CA2H) - M4-2 (BATT) Engine switch off 6 kΩ or higher Below 6 kΩ: +B short
      M4-12 (CA2L) - M4-2 (BATT) Engine switch off 6 kΩ or higher Below 6 kΩ: +B short
      M4-13 (CA2H) - M4-4 (GND) Engine switch off 200 Ω or higher Below 200 Ω: Ground short
      M4-12 (CA2L) - M4-4 (GND) Engine switch off 200 Ω or higher Below 200 Ω: Ground short
      TEXT IN ILLUSTRATION

      *a Component with harness connected
      (Network Gateway ECU)
      RESULT

      Result Proceed to
      NG
      • Open in CAN main wire
      		 A
      NG
      • Short in line
      • +B short
      • Ground short
      		 B
      OK C

    Result:  B

    B 

    See step  9

    Result:  C

    C 

    See step  14

    Result:  A

    A 

    See step  4

  4. CHECK FOR OPEN IN CAN BUS MAIN WIRE (NETWORK GATEWAY ECU - TELEVISION CAMERA ASSEMBLY) 
    1. Disconnect the network gateway ECU connector.
      GTY637546Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Switch Condition Specified Condition
      M4-13 (CA2H) - M4-12 (CA2L) Engine switch off 108 to 132 Ω
      TEXT IN ILLUSTRATION

      *a Rear view of wire harness connector
      (to Network Gateway ECU)

    Result:  OK

    OK 

    REPLACE NETWORK GATEWAY ECU 

    (Refer to REMOVAL [09/2015 - ] )

    Result:  NG

    NG 

    See step  5

  5. CONNECT CONNECTOR 
    1. Reconnect the M4 network gateway ECU connector.

    Result:  NEXT

    NEXT 

    See step  6

  6. CHECK FOR OPEN IN CAN BUS MAIN WIRE (LUGGAGE ELECTRICAL KEY SWITCH - NETWORK GATEWAY ECU) 
    1. Disconnect the luggage electrical key switch connector.
      GTY614580Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Switch Condition Specified Condition
      S73-9 (CANH) - S73-4 (CANL) Engine switch off 108 to 132 Ω
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Luggage Electrical Key Switch)

    Result:  NG

    NG 

    REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO LUGGAGE ELECTRICAL KEY SWITCH (LUGGAGE ELECTRICAL KEY SWITCH - NETWORK GATEWAY ECU) 

    Result:  OK

    OK 

    See step  7

  7. CONNECT CONNECTOR 
    1. Reconnect the S73 luggage electrical key switch connector.

    Result:  NEXT

    NEXT 

    See step  8

  8. CHECK FOR OPEN IN CAN BUS MAIN WIRE (TELEVISION CAMERA ASSEMBLY - NETWORK GATEWAY ECU) 
    1. Disconnect the television camera assembly connector.
      GTY621830Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Switch Condition Specified Condition
      A-4 (CANH) - A-1 (CANL) Engine switch off 108 to 132 Ω
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Television Camera Assembly)

    Result:  OK

    OK 

    REPLACE TELEVISION CAMERA ASSEMBLY 

    (Refer to REMOVAL [09/2015 - ] )

    Result:  NG

    NG 

    REPLACE LUGGAGE ELECTRICAL KEY SWITCH 

    (Refer to REMOVAL [09/2015 - ] )

  9. CHECK FOR SHORT IN CAN BUS WIRES (NETWORK GATEWAY ECU - TELEVISION CAMERA ASSEMBLY) 
    1. Disconnect the network gateway ECU connector.
      GTY666054Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Switch Condition Specified Condition
      M4-13 (CA2H) - M4-12 (CA2L) Engine switch off 108 to 132 Ω
      M4-13 (CA2H) - L31-4 (CG) Engine switch off 200 Ω or higher
      M4-12 (CA2L) - L31-4 (CG) Engine switch off 200 Ω or higher
      M4-13 (CA2H) - L31-16 (BAT) Engine switch off 6 kΩ or higher
      M4-12 (CA2L) - L31-16 (BAT) Engine switch off 6 kΩ or higher
      TEXT IN ILLUSTRATION

      *a Rear view of wire harness connector
      (to Network Gateway ECU)
      *b Front view of DLC3

    Result:  OK

    OK 

    REPLACE NETWORK GATEWAY ECU 

    (Refer to REMOVAL [09/2015 - ] )

    Result:  NG

    NG 

    See step  10

  10. CONNECT CONNECTOR 
    1. Reconnect the M4 network gateway ECU connector.

    Result:  NEXT

    NEXT 

    See step  11

  11. CHECK FOR SHORT IN CAN BUS WIRES (LUGGAGE ELECTRICAL KEY SWITCH - NETWORK GATEWAY ECU) 
    1. Disconnect the luggage electrical key switch connector.
      GTY645396Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Switch Condition Specified Condition
      S73-9 (CANH) - S73-4 (CANL) Engine switch off 200 Ω or higher
      S73-9 (CANH) - L31-4 (CG) Engine switch off 200 Ω or higher
      S73-4 (CANL) - L31-4 (CG) Engine switch off 200 Ω or higher
      S73-9 (CANH) - L31-16 (BAT) Engine switch off 6 kΩ or higher
      S73-4 (CANL) - L31-16 (BAT) Engine switch off 6 kΩ or higher
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Luggage Electrical Key Switch)
      *b Front view of DLC3

    Result:  NG

    NG 

    REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO LUGGAGE ELECTRICAL KEY SWITCH (LUGGAGE ELECTRICAL KEY SWITCH - NETWORK GATEWAY ECU) 

    Result:  OK

    OK 

    See step  12

  12. CONNECT CONNECTOR 
    1. Reconnect the S73 luggage electrical key switch connector.

    Result:  NEXT

    NEXT 

    See step  13

  13. CHECK FOR SHORT IN CAN BUS WIRES (TELEVISION CAMERA ASSEMBLY - NETWORK GATEWAY ECU) 
    1. Disconnect the television camera assembly connector.
      GTY646504Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Switch Condition Specified Condition
      A-4 (CANH) - A-1 (CANL) Engine switch off 200 Ω or higher
      A-4 (CANH) - L31-4 (CG) Engine switch off 200 Ω or higher
      A-1 (CANL) - L31-4 (CG) Engine switch off 200 Ω or higher
      A-4 (CANH) - L31-16 (BAT) Engine switch off 6 kΩ or higher
      A-1 (CANL) - L31-16 (BAT) Engine switch off 6 kΩ or higher
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Television Camera Assembly)
      *b Front view of DLC3

    Result:  OK

    OK 

    REPLACE TELEVISION CAMERA ASSEMBLY 

    (Refer to REMOVAL [09/2015 - ] )

    Result:  NG

    NG 

    REPLACE LUGGAGE ELECTRICAL KEY SWITCH 

    (Refer to REMOVAL [09/2015 - ] )

  14. CHECK HARNESS AND CONNECTOR (NETWORK GATEWAY ECU - BATTERY AND BODY GROUND) 
    1. Connect the cable to the negative (-) battery terminal.
      GTY629949Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE:

      When disconnecting the cable, some systems need to be initialized after the cable is reconnected (Refer to INITIALIZATION [09/2015 - ] ).

    2. Disconnect the network gateway ECU connector.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      M4-2 (BATT) - Body ground Always 11 to 14 V
      M4-9 (IG2) - Body ground Engine switch on (IG) 11 to 14 V
      M4-10 (IG1) - Body ground Engine switch on (IG) 11 to 14 V
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      M4-4 (GND) - Body ground Always Below 1 Ω
      TEXT IN ILLUSTRATION

      *a Rear view of wire harness connector
      (to Network Gateway ECU)

    Result:  OK

    OK 

    REPLACE NETWORK GATEWAY ECU 

    (Refer to REMOVAL [09/2015 - ] )

    Result:  NG

    NG 

    REPAIR OR REPLACE HARNESS AND CONNECTOR 

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