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

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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 TOYOTA parking assist-sensor system (for 4 sensor type).

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INSPECTION PROCEDURE

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PROCEDURE

1. Click here

   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).

   
   
   • NEXTClick here
2. Click here

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

   
   
   1. 

      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

      Table 1. Text in Illustration

      *a	Component with harness connected (Network Gateway ECU)

      Table 2. Result

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

   
   
   • AClick here
   • BClick here
   • CClick here
3. Click here

   CHECK FOR OPEN IN CAN BUS WIRE (NO. 2 JUNCTION CONNECTOR - NETWORK GATEWAY ECU)

   
   
   1. 

      Disconnect the G95 No. 2 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

      Table 3. Text in Illustration

      *a	Rear view of wire harness connector (to No. 2 Junction Connector)

   
   
   • OKClick here
   • NGClick here
4. Click here

   CHECK FOR OPEN IN CAN BUS WIRE (NO. 2 JUNCTION CONNECTOR - NO. 5 JUNCTION CONNECTOR)

   
   
   1. 

      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

      Table 4. Text in Illustration

      *a	Rear view of wire harness connector (to No. 2 Junction Connector)

   
   
   • OKClick here
   • NGClick here
5. Click here

   CONNECT CONNECTOR

   
   

   1. Reconnect the G95 No. 2 junction connector.

   
   
   • NEXTClick here
6. Click here

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

   
   
   1. 

      Disconnect the G98 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 G98-1 (CANH) - G98-12 (CANL) Ignition switch off 108 to 132 Ω

      Table 5. Text in Illustration

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

   
   
   • OKClick here
   • NGClick here
7. Click here

   CHECK FOR OPEN IN CAN BUS WIRE (NO. 3 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR)

   
   
   1. 

      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

      Table 6. Text in Illustration

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

   
   
   • OKClick here
   • NGClick here
8. Click here

   CONNECT CONNECTOR

   
   

   1. Reconnect the G98 No. 3 junction connector.

   
   
   • NEXTClick here
9. Click here

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

   
   
   1. 

      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

      Table 7. Text in Illustration

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

   
   
   • OKClick here
   • NGClick here
10. Click here

    CONNECT CONNECTOR

    
    

    1. Reconnect the G95 No. 2 junction connector.

    
    
    • NEXTClick here
11. Click here

    CHECK FOR OPEN IN CAN BUS WIRE (NO. 1 JUNCTION CONNECTOR - NO. 5 JUNCTION CONNECTOR)

    
    
    1. 

       Disconnect the A72 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 A72-1 (CANH) - A72-12 (CANL) Ignition switch off 108 to 132 Ω

       Table 8. Text in Illustration

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

    
    
    • OKClick here
    • NGClick here
12. Click here

    CHECK FOR OPEN IN CAN BUS WIRE (NO. 1 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR)

    
    
    1. 

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

       Standard Resistance
       Tester Connection Switch Condition Specified Condition A72-2 (CANH) - A72-13 (CANL) Ignition switch off 108 to 132 Ω

       Table 9. Text in Illustration

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

    
    
    • OKClick here
    • NGClick here
13. Click here

    CONNECT CONNECTOR

    
    

    1. Reconnect the A72 No. 1 junction connector.

    
    
    • NEXTClick here
14. Click here

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

    
    
    1. 

       Disconnect the G102 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 G102-3 (CANH) - G102-2 (CANL) Ignition switch off 108 to 132 Ω

       Table 10. Text in Illustration

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

    
    
    • OKClick here
    • NGClick here
15. Click here

    CHECK FOR SHORT IN CAN BUS WIRES (NO. 1 JUNCTION CONNECTOR SIDE)

    
    
    1. 

       Disconnect the A72 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 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

       Table 11. Text in Illustration

       *a	Component with harness connected (Network Gateway ECU)

    
    
    • OKClick here
    • NGClick here
16. Click here

    CHECK FOR SHORT IN CAN BUS WIRES (NO. 1 JUNCTION CONNECTOR - NO. 5 JUNCTION CONNECTOR)

    
    
    1. 

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

       Standard Resistance
       Tester Connection Switch Condition Specified Condition A72-1 (CANH) - A72-12 (CANL) Ignition switch off 108 to 132 Ω A72-1 (CANH) - G48-4 (CG) Ignition switch off 200 Ω or higher A72-12 (CANL) - G48-4 (CG) Ignition switch off 200 Ω or higher A72-1 (CANH) - G48-16 (BAT) Ignition switch off 6 kΩ or higher A72-12 (CANL) - G48-16 (BAT) Ignition switch off 6 kΩ or higher

       Table 12. Text in Illustration

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

    
    
    • OKClick here
    • NGClick here
17. Click here

    CONNECT CONNECTOR

    
    

    1. Reconnect the A72 No. 1 junction connector.

    
    
    • NEXTClick here
18. Click here

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

    
    
    1. 

       Disconnect the G102 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 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

       Table 13. Text in Illustration

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

    
    
    • OKClick here
    • NGClick here
19. Click here

    CONNECT CONNECTOR

    
    

    1. Reconnect the A72 No. 1 junction connector.

    
    
    • NEXTClick here
20. Click here

    CHECK FOR SHORT IN CAN BUS WIRES (NO. 2 JUNCTION CONNECTOR - NO. 1 JUNCTION CONNECTOR)

    
    
    1. 

       Disconnect the G95 No. 2 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

       Table 14. Text in Illustration

       *a	Rear view of wire harness connector (to No. 2 Junction Connector)
       *b	Front view of DLC3

    
    
    • OKClick here
    • NGClick here
21. Click here

    CHECK FOR SHORT IN CAN BUS WIRES (NO. 2 JUNCTION CONNECTOR SIDE)

    
    
    1. 

       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

       Table 15. Text in Illustration

       *a	Component with harness connected (Network Gateway ECU)

    
    
    • OKClick here
    • NGClick here
22. Click here

    CHECK FOR SHORT IN CAN BUS WIRES (NO. 2 JUNCTION CONNECTOR - CLEARANCE WARNING ECU ASSEMBLY)

    
    
    1. 

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

       Standard Resistance
       Tester Connection Switch Condition Specified Condition G95-2 (CANH) - G95-13 (CANL) Ignition switch off 200 Ω or higher G95-2 (CANH) - G48-4 (CG) Ignition switch off 200 Ω or higher G95-13 (CANL) - G48-4 (CG) Ignition switch off 200 Ω or higher G95-2 (CANH) - G48-16 (BAT) Ignition switch off 6 kΩ or higher G95-13 (CANL) - G48-16 (BAT) Ignition switch off 6 kΩ or higher

       Table 16. Text in Illustration

       *a	Rear view of wire harness connector (to No. 2 Junction Connector)
       *b	Front view of DLC3

    
    
    • OKClick here
    • NGClick here
23. Click here

    CONNECT CONNECTOR

    
    

    1. Reconnect the G95 No. 2 junction connector.

    
    
    • NEXTClick here
24. Click here

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

    
    
    1. 

       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

       Table 17. Text in Illustration

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

    
    
    • OKClick here
    • NGClick here
25. Click here

    CONNECT CONNECTOR

    
    

    1. Reconnect the G95 No. 2 junction connector.

    
    
    • NEXTClick here
26. Click here

    CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR)

    
    
    1. 

       Disconnect the G98 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 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

       Table 18. Text in Illustration

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

    
    
    • OKClick here
    • NGClick here
27. Click here

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

    
    
    1. 

       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

       Table 19. Text in Illustration

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

    
    
    • OKClick here
    • NGClick here
28. Click here

    CONNECT CONNECTOR

    
    

    1. Reconnect the G98 No. 3 junction connector.

    
    
    • NEXTClick here
29. Click here

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

    
    
    1. 

       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

       Table 20. Text in Illustration

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

    
    
    • OKClick here
    • NGClick here
30. Click here

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

    
    
    1. 

       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

       Table 21. Text in Illustration

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

    
    
    • OKClick here
    • NGClick here
31. Click here

    REPLACE NO. 2 JUNCTION CONNECTOR

32. Click here

    REPLACE NO. 3 JUNCTION CONNECTOR

33. Click here

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 3 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR)

34. Click here

    REPLACE NETWORK GATEWAY ECUClick here

35. Click here

    REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO NETWORK GATEWAY ECU (NETWORK GATEWAY ECU - NO. 3 JUNCTION CONNECTOR)

36. Click here

    REPLACE NO. 1 JUNCTION CONNECTOR

37. Click here

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 1 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR)

38. Click here

    REPLACE NO. 5 JUNCTION CONNECTOR

39. Click here

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 5 JUNCTION CONNECTOR - NO. 1 JUNCTION CONNECTOR)

40. Click here

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 2 JUNCTION CONNECTOR - NO. 1 JUNCTION CONNECTOR)

41. Click here

    REPLACE CLEARANCE WARNING ECU ASSEMBLYClick here

42. Click here

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

43. Click here

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

44. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR