CAN COMMUNICATION SYSTEM(for LHD without Entry and Start System), Diagnostic DTC:U1002

DESCRIPTION

• The network gateway ECU stores this DTC when no signals can be received from the ECUs that have been memorized as those connected to the CAN V2 bus.

• When the network gateway ECU receives a response signal from the ECUs connected to the CAN V2 bus, the network gateway ECU recognizes and memorizes that the ECU is connected to the CAN V2 bus. Based on this memorized data, the network gateway ECU monitors for malfunctions in the ECUs connected to the CAN V2 bus when communicating with those ECUs. If the network gateway ECU cannot receive response signals from the ECUs that have been memorized as those connected to the CAN V2 bus, the network gateway ECU determines that a malfunction exists.

• If 2 or more DTCs are output during the DTC check, one side of the CAN branch wire may be open (one side of the CANH [CAN branch wire]/CANL [CAN branch wire] of the ECU and/or sensor is open).

• For vehicles with a network gateway ECU.

• *1: w/ TOYOTA Parking Assist-sensor System (for 4 Sensor Type)

• *2: for LED Headlight

WIRING DIAGRAM

CAUTION / NOTICE / HINT

PROCEDURE

1. 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:

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

      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.

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

   
   

   NEXT

2. CHECK CAN BUS WIRE (CHECK CAN MAIN WIRE FOR DISCONNECTION, CHECK BUS LINE FOR SHORT)

   
   
   1. 

      Text in Illustration

      *a	Component with harness connected (Network Gateway ECU)

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

      Standard Resistance

      Tester Connection Switch Condition Specified Condition Resistance: Malfunction G155-13 (CA2H) - G155-12 (CA2L) Ignition switch off 54 to 69 Ω Below 53 Ω: Short in line G155-13 (CA2H) - G155-12 (CA2L) Ignition switch off 54 to 69 Ω Higher than 70 Ω: Open in CAN main bus line G155-13 (CA2H) - G155-2 (BATT) Ignition switch off 6 kΩ or higher Below 6 kΩ: +B short G155-12 (CA2L) - G155-2 (BATT) Ignition switch off 6 kΩ or higher Below 6 kΩ: +B short G155-13 (CA2H) - G155-4 (GND) Ignition switch off 200 Ω or higher Below 200 Ω: Ground short G155-12 (CA2L) - G155-4 (GND) Ignition switch off 200 Ω or higher Below 200 Ω: Ground short

      Result

      Result	Proceed to
      NG Open in CAN main bus line	A
      NG Short in line +B short GND short	B
      OK	C

   
   

   B

   CHECK FOR SHORT IN CAN BUS WIRES (NO. 5 JUNCTION CONNECTOR SIDE) Click here

   C

   CHECK HARNESS AND CONNECTOR (NETWORK GATEWAY ECU - BATTERY AND BODY GROUND) Click here

   A

3. CHECK FOR OPEN IN CAN BUS WIRE (NO. 3 JUNCTION CONNECTOR - NETWORK GATEWAY ECU)

   
   
   1. 

      Text in Illustration

      *a	Rear view of wire harness connector (to No. 3 Junction Connector)

      Disconnect the G95 No. 3 junction connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition G95-1 (CANH) - G95-12 (CANL) Ignition switch off 108 to 132 Ω

   
   

   NG

   CONNECT CONNECTOR Click here

   OK

4. CHECK FOR OPEN IN CAN BUS WIRE (NO. 3 JUNCTION CONNECTOR - NO. 7 JUNCTION CONNECTOR)

   
   
   1. 

      Text in Illustration

      *a	Rear view of wire harness connector (to No. 3 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition G95-3 (CANH) - G95-14 (CANL) Ignition switch off 108 to 132 Ω

   
   

   OK

   REPLACE NO. 3 JUNCTION CONNECTOR

   NG

   CONNECT CONNECTOR Click here

5. CONNECT CONNECTOR

   
   

   1. Reconnect the G95 No. 3 junction connector.

   
   

   NEXT

6. CHECK FOR OPEN IN CAN BUS WIRE (NO. 1 JUNCTION CONNECTOR - NETWORK GATEWAY ECU)

   
   
   1. 

      Text in Illustration

      *a	Rear view of wire harness connector (to No. 1 Junction Connector)

      Disconnect the G98 No. 1 junction connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition G98-1 (CANH) - G98-12 (CANL) Ignition switch off 108 to 132 Ω

   
   

   NG

   CONNECT CONNECTOR Click here

   OK

7. CHECK FOR OPEN IN CAN BUS WIRE (NO. 1 JUNCTION CONNECTOR - NO. 3 JUNCTION CONNECTOR)

   
   
   1. 

      Text in Illustration

      *a	Rear view of wire harness connector (to No. 1 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition G98-3 (CANH) - G98-14 (CANL) Ignition switch off 108 to 132 Ω

   
   

   OK

   REPLACE NO. 1 JUNCTION CONNECTOR

   NG

   REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 1 JUNCTION CONNECTOR - NO. 3 JUNCTION CONNECTOR)

8. CONNECT CONNECTOR

   
   

   1. Reconnect the G98 No. 1 junction connector.

   
   

   NEXT

9. CHECK FOR OPEN IN CAN BUS WIRE (NETWORK GATEWAY ECU)

   
   
   1. 

      Text in Illustration

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

      Disconnect the G155 network gateway ECU connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition G155-13 (CA2H) - G155- 12 (CA2L) Ignition switch off 108 to 132 Ω

   
   

   OK

   REPLACE NETWORK GATEWAY ECU Click here

   NG

   REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO NETWORK GATEWAY ECU (NETWORK GATEWAY ECU - NO. 1 JUNCTION CONNECTOR)

10. CONNECT CONNECTOR

    
    

    1. Reconnect the G95 No. 3 junction connector.

    
    

    NEXT

11. CHECK FOR OPEN IN CAN BUS WIRE (NO. 5 JUNCTION CONNECTOR - NO. 7 JUNCTION CONNECTOR)

    
    
    1. 

       Text in Illustration

       *a	Rear view of wire harness connector (to No. 5 Junction Connector)

       Disconnect the A73 No. 5 junction connector.

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

       Standard Resistance
       Tester Connection Switch Condition Specified Condition A73-1 (CANH) - A73-12 (CANL) Ignition switch off 108 to 132 Ω

    
    

    NG

    CONNECT CONNECTOR Click here

    OK

12. CHECK FOR OPEN IN CAN BUS WIRE (NO. 5 JUNCTION CONNECTOR - NO. 3 JUNCTION CONNECTOR)

    
    
    1. 

       Text in Illustration

       *a	Rear view of wire harness connector (to No. 5 Junction Connector)

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

       Standard Resistance
       Tester Connection Switch Condition Specified Condition A73-2 (CANH) - A73-13 (CANL) Ignition switch off 108 to 132 Ω

    
    

    OK

    REPLACE NO. 5 JUNCTION CONNECTOR

    NG

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 5 JUNCTION CONNECTOR - NO. 3 JUNCTION CONNECTOR)

13. CONNECT CONNECTOR

    
    

    1. Reconnect the A73 No. 5 junction connector.

    
    

    NEXT

14. CHECK FOR OPEN IN CAN BUS WIRE (NO. 7 JUNCTION CONNECTOR)

    
    
    1. 

       Text in Illustration

       *a	Rear view of wire harness connector (to No. 7 Junction Connector)

       Disconnect the G102 No. 7 junction connector.

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

       Standard Resistance
       Tester Connection Switch Condition Specified Condition G102-3 (CANH) - G102-2 (CANL) Ignition switch off 108 to 132 Ω

    
    

    OK

    REPLACE NO. 7 JUNCTION CONNECTOR

    NG

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 7 JUNCTION CONNECTOR - NO. 5 JUNCTION CONNECTOR)

15. CHECK FOR SHORT IN CAN BUS WIRES (NO. 5 JUNCTION CONNECTOR SIDE)

    
    
    1. 

       Text in Illustration

       *a	Component with harness connected (Network Gateway ECU)

       Disconnect the A73 No. 5 junction connector.

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

       Standard Resistance
       Tester Connection Switch Condition Specified Condition G155-13 (CA2H) - G155-12 (CA2L) Ignition switch off 108 to 132 Ω G155-13 (CA2H) - G155-4 (GND) Ignition switch off 200 Ω or higher G155-12 (CA2L) - G155-4 (GND) Ignition switch off 200 Ω or higher G155-13 (CA2H) - G155-2 (BATT) Ignition switch off 6 kΩ or higher G155-12 (CA2L) - G155-2 (BATT) Ignition switch off 6 kΩ or higher

    
    

    NG

    CONNECT CONNECTOR Click here

    OK

16. CHECK FOR SHORT IN CAN BUS WIRES (NO. 5 JUNCTION CONNECTOR - HEADLIGHT SWIVEL ECU ASSEMBLY)

    Note

    For vehicles with a halogen headlight, go to "Check for Short in CAN Bus Wires (No. 5 Junction Connector - No. 7 Junction Connector)".

    
    
    1. 

       Text in Illustration

       *a	Rear view of wire harness connector (to No. 5 Junction Connector)
       *b	Front view of DLC3

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

       Standard Resistance
       Tester Connection Switch Condition Specified Condition A73-4 (CANH) - A73-15 (CANL) Ignition switch off 200 Ω or higher A73-4 (CANH) - G48-4 (CG) Ignition switch off 200 Ω or higher A73-15 (CANL) - G48-4 (CG) Ignition switch off 200 Ω or higher A73-4 (CANH) - G48-16 (BAT) Ignition switch off 6 kΩ or higher A73-15 (CANL) - G48-16 (BAT) Ignition switch off 6 kΩ or higher

    
    

    NG

    CONNECT CONNECTOR Click here

    OK

17. CHECK FOR SHORT IN CAN BUS WIRES (NO. 5 JUNCTION CONNECTOR - NO. 7 JUNCTION CONNECTOR)

    
    
    1. 

       Text in Illustration

       *a	Rear view of wire harness connector (to No. 5 Junction Connector)
       *b	Front view of DLC3

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

       Standard Resistance
       Tester Connection Switch Condition Specified Condition A73-1 (CANH) - A73-12 (CANL) Ignition switch off 108 to 132 Ω A73-1 (CANH) - G48-4 (CG) Ignition switch off 200 Ω or higher A73-12 (CANL) - G48-4 (CG) Ignition switch off 200 Ω or higher A73-1 (CANH) - G48-16 (BAT) Ignition switch off 6 kΩ or higher A73-12 (CANL) - G48-16 (BAT) Ignition switch off 6 kΩ or higher

    
    

    OK

    REPLACE NO. 5 JUNCTION CONNECTOR

    NG

    CONNECT CONNECTOR Click here

18. CONNECT CONNECTOR

    
    

    1. Reconnect the A73 No. 5 junction connector.

    
    

    NEXT

19. CHECK FOR SHORT IN CAN BUS WIRES (HEADLIGHT SWIVEL ECU ASSEMBLY)

    
    
    1. 

       Text in Illustration

       *a	Front view of wire harness connector (to Headlight Swivel ECU Assembly)
       *b	Front view of DLC3

       Disconnect the A58 headlight swivel ECU assembly connector.

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

       Standard Resistance
       Tester Connection Switch Condition Specified Condition A58-12 (CANH) - A58-13 (CANL) Ignition switch off 54 to 69 Ω A58-12 (CANH) - G48-4 (CG) Ignition switch off 200 Ω or higher A58-13 (CANL) - G48-4 (CG) Ignition switch off 200 Ω or higher A58-12 (CANH) - G48-16 (BAT) Ignition switch off 6 kΩ or higher A58-13 (CANL) - G48-16 (BAT) Ignition switch off 6 kΩ or higher

    
    

    OK

    REPLACE HEADLIGHT SWIVEL ECU ASSEMBLY Click here

    NG

    REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO HEADLIGHT SWIVEL ECU ASSEMBLY (CANH, CANL)

20. CONNECT CONNECTOR

    
    

    1. Reconnect the A73 No. 5 junction connector.

    
    

    NEXT

21. CHECK FOR SHORT IN CAN BUS WIRES (NO. 7 JUNCTION CONNECTOR)

    
    
    1. 

       Text in Illustration

       *a	Rear view of wire harness connector (to No. 7 Junction Connector)
       *b	Front view of DLC3

       Disconnect the G102 No. 7 junction connector.

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

       Standard Resistance
       Tester Connection Switch Condition Specified Condition G102-3 (CANH) - G102-2 (CANL) Ignition switch off 108 to 132 Ω G102-3 (CANH) - G48-4 (CG) Ignition switch off 200 Ω or higher G102-2 (CANL) - G48-4 (CG) Ignition switch off 200 Ω or higher G102-3 (CANH) - G48-16 (BAT) Ignition switch off 6 kΩ or higher G102-2 (CANL) - G48-16 (BAT) Ignition switch off 6 kΩ or higher

    
    

    OK

    REPLACE NO. 7 JUNCTION CONNECTOR

    NG

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 7 JUNCTION CONNECTOR - NO. 5 JUNCTION CONNECTOR)

22. CONNECT CONNECTOR

    
    

    1. Reconnect the A73 No. 5 junction connector.

    
    

    NEXT

23. CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR - NO. 5 JUNCTION CONNECTOR)

    
    
    1. 

       Text in Illustration

       *a	Rear view of wire harness connector (to No. 3 Junction Connector)
       *b	Front view of DLC3

       Disconnect the G95 No. 3 junction connector.

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

       Standard Resistance
       Tester Connection Switch Condition Specified Condition G95-3 (CANH) - G95-14 (CANL) Ignition switch off 108 to 132 Ω G95-3 (CANH) - G48-4 (CG) Ignition switch off 200 Ω or higher G95-14 (CANL) - G48-4 (CG) Ignition switch off 200 Ω or higher G95-3 (CANH) - G48-16 (BAT) Ignition switch off 6 kΩ or higher G95-14 (CANL) - G48-16 (BAT) Ignition switch off 6 kΩ or higher

    
    

    NG

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 3 JUNCTION CONNECTOR - NO. 5 JUNCTION CONNECTOR)

    OK

24. CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR SIDE)

    
    
    1. 

       Text in Illustration

       *a	Component with harness connected (Network Gateway ECU)

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

       Standard Resistance
       Tester Connection Switch Condition Specified Condition G155-13 (CA2H) - G155-12 (CA2L) Ignition switch off 108 to 132 Ω G155-13 (CA2H) - G155-4 (GND) Ignition switch off 200 Ω or higher G155-12 (CA2L) - G155-4 (GND) Ignition switch off 200 Ω or higher G155-13 (CA2H) - G155-2 (BATT) Ignition switch off 6 kΩ or higher G155-12 (CA2L) - G155-2 (BATT) Ignition switch off 6 kΩ or higher

    
    

    OK

    REPLACE NO. 3 JUNCTION CONNECTOR

    NG

25. CONNECT CONNECTOR

    
    

    1. Reconnect the G95 No. 3 junction connector.

    
    

    NEXT

26. CHECK FOR SHORT IN CAN BUS WIRES (NO. 1 JUNCTION CONNECTOR - NO. 3 JUNCTION CONNECTOR)

    
    
    1. 

       Text in Illustration

       *a	Rear view of wire harness connector (to No. 1 Junction Connector)
       *b	Front view of DLC3

       Disconnect the G98 No. 1 junction connector.

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

       Standard Resistance
       Tester Connection Switch Condition Specified Condition G98-3 (CANH) - G98-14 (CANL) Ignition switch off 108 to 132 Ω G98-3 (CANH) - G48-4 (CG) Ignition switch off 200 Ω or higher G98-14 (CANL) - G48-4 (CG) Ignition switch off 200 Ω or higher G98-3 (CANH) - G48-16 (BAT) Ignition switch off 6 kΩ or higher G98-14 (CANL) - G48-16 (BAT) Ignition switch off 6 kΩ or higher

    
    

    NG

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 1 JUNCTION CONNECTOR - NO. 3 JUNCTION CONNECTOR)

    OK

27. CHECK FOR SHORT IN CAN BUS WIRES (NO. 1 JUNCTION CONNECTOR - CLEARANCE WARNING ECU ASSEMBLY)

    
    
    1. 

       Text in Illustration

       *a	Rear view of wire harness connector (to No. 1 Junction Connector)
       *b	Front view of DLC3

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

       Standard Resistance
       Tester Connection Switch Condition Specified Condition G98-2 (CANH) - G98-13 (CANL) Ignition switch off 200 Ω or higher G98-2 (CANH) - G48-4 (CG) Ignition switch off 200 Ω or higher G98-13 (CANL) - G48-4 (CG) Ignition switch off 200 Ω or higher G98-2 (CANH) - G48-16 (BAT) Ignition switch off 6 kΩ or higher G98-13 (CANL) - G48-16 (BAT) Ignition switch off 6 kΩ or higher

    
    

    NG

    CONNECT CONNECTOR Click here

    OK

28. CHECK FOR SHORT IN CAN BUS WIRES (NO. 1 JUNCTION CONNECTOR - NETWORK GATEWAY ECU)

    
    
    1. 

       Text in Illustration

       *a	Rear view of wire harness connector (to No. 1 Junction Connector)
       *b	Front view of DLC3

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

       Standard Resistance
       Tester Connection Switch Condition Specified Condition G98-1 (CANH) - G98-12 (CANL) Ignition switch off 108 to 132 Ω G98-1 (CANH) - G48-4 (CG) Ignition switch off 200 Ω or higher G98-12 (CANL) - G48-4 (CG) Ignition switch off 200 Ω or higher G98-1 (CANH) - G48-16 (BAT) Ignition switch off 6 kΩ or higher G98-12 (CANL) - G48-16 (BAT) Ignition switch off 6 kΩ or higher

    
    

    OK

    REPLACE NO. 1 JUNCTION CONNECTOR

    NG

    CONNECT CONNECTOR Click here

29. CONNECT CONNECTOR

    
    

    1. Reconnect the G98 No. 1 junction connector.

    
    

    NEXT

30. CHECK FOR SHORT IN CAN BUS WIRES (CLEARANCE WARNING ECU ASSEMBLY)

    
    
    1. 

       Text in Illustration

       *a	Front view of wire harness connector (to Clearance Warning ECU Assembly)
       *b	Front view of DLC3

       Disconnect the I1 clearance warning ECU assembly connector.

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

       Standard Resistance
       Tester Connection Switch Condition Specified Condition I1-3 (R1) - I1-5 (R2) Ignition switch off 54 to 69 Ω I1-3 (R1) - G48-4 (CG) Ignition switch off 200 Ω or higher I1-5 (R2) - G48-4 (CG) Ignition switch off 200 Ω or higher I1-3 (R1) - G48-16 (BAT) Ignition switch off 6 kΩ or higher I1-5 (R2) - G48-16 (BAT) Ignition switch off 6 kΩ or higher

    
    

    OK

    REPLACE CLEARANCE WARNING ECU ASSEMBLY Click here

    NG

    REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO CLEARANCE WARNING ECU ASSEMBLY (R1, R2)

31. CONNECT CONNECTOR

    
    

    1. Reconnect the G98 No. 1 junction connector.

    
    

    NEXT

32. CHECK FOR SHORT IN CAN BUS WIRES (NETWORK GATEWAY ECU)

    
    
    1. 

       Text in Illustration

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

       Disconnect the G155 network gateway ECU connector.

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

       Standard Resistance
       Tester Connection Switch Condition Specified Condition G155-13 (CA2H) - G155-12 (CA2L) Ignition switch off 108 to 132 Ω G155-13 (CA2H) - G48-4 (CG) Ignition switch off 200 Ω or higher G155-12 (CA2L) - G48-4 (CG) Ignition switch off 200 Ω or higher G155-13 (CA2H) - G48-16 (BAT) Ignition switch off 6 kΩ or higher G155-12 (CA2L) - G48-16 (BAT) Ignition switch off 6 kΩ or higher

    
    

    OK

    REPLACE NETWORK GATEWAY ECU Click here

    NG

    REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO NETWORK GATEWAY ECU (CA2H, CA2L)

33. CHECK HARNESS AND CONNECTOR (NETWORK GATEWAY ECU - BATTERY AND BODY GROUND)

    
    
    1. 

       Text in Illustration

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

       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. Disconnect the G155 network gateway ECU connector.

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

       Standard Resistance
       Tester Connection Condition Specified Condition G155-4 (GND) - Body ground Always Below 1 Ω

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

       Standard Voltage
       Tester Connection Condition Specified Condition G155-2 (BATT) - Body ground Always 11 to 14 V G155-10 (IG1) - Body ground Ignition switch ON 11 to 14 V G155-9 (IG2) - Body ground Ignition switch ON 11 to 14 V

    
    

    OK

    REPLACE NETWORK GATEWAY ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR