CAN COMMUNICATION SYSTEM, Diagnostic DTC:U1002

DESCRIPTION

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

• When the power management control ECU receives a response signal from the ECUs connected to the V2 bus, the power management ECU recognizes and memorizes that the ECU is connected to the V2 bus. Based on this memorized data, the power management control ECU monitors for malfunctions in the ECUs connected to the V2 bus when communicating with those ECUs. If the power management control ECU cannot receive response signals from the ECUs that have been memorized as those connected to the V2 bus, the power management control 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 1WW engine type and entry and start system only.

• *: w/ Cruise Control System

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. PRECAUTION

   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.

   
   

   NEXT

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 CAN branch wire.

      CAUTION:

      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 Click here.

   
   

   NEXT

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

   
   
   1. 

      Text in Illustration

      *a	Component with harness connected (to Power Management Control ECU)

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

      Standard Resistance

      Tester Connection Switch Condition Specified Condition Resistance: Malfunction H71-26 (CA2H) - H71-25 (CA2L) Ignition switch off 54 to 69 Ω Below 53 Ω: Short in line H71-26 (CA2H) - H71-25 (CA2L) Ignition switch off 54 to 69 Ω Higher than 70 Ω: Open in CAN main bus line H71-26 (CA2H) - H71-1 (AM22) Ignition switch off 6 kΩ or higher Below 6 kΩ: +B short H71-25 (CA2L) - H71-1 (AM22) Ignition switch off 6 kΩ or higher Below 6 kΩ: +B short H71-26 (CA2H) - H71-6 (GND) Ignition switch off 200 Ω or higher Below 200 Ω: Ground short H71-25 (CA2L) - H71-6 (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 Ground short	B
      OK	C

   
   

   B

   CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR - DRIVING SUPPORT ECU ASSEMBLY) Click here

   C

   CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - BATTERY AND GROUND) Click here

   A

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

   
   
   1. 

      Text in Illustration

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

      Disconnect the 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 H126-11 (CANH) - H126-22 (CANL) Ignition switch off 108 to 132 Ω

   
   

   NG

   CONNECT CONNECTOR Click here

   OK

5. CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 3 JUNCTION CONNECTOR - POWER MANAGEMENT CONTROL ECU)

   
   
   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 H126-10 (CANH) - H126-21 (CANL) Ignition switch off 108 to 132 Ω

   
   

   NG

   CONNECT CONNECTOR Click here

   OK

   REPLACE NO. 3 JUNCTION CONNECTOR

6. CONNECT CONNECTOR

   
   

   1. Reconnect the H126 No. 3 junction connector.

   
   

   NEXT

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

   
   
   1. 

      Text in Illustration

      *a	Rear view of wire harness connector (to No. 4 Junction Connector)

      Disconnect the No. 4 junction connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition H125-3 (CANH) - H125-2 (CANL) Ignition switch off 108 to 132 Ω

   
   

   NG

   REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 4 JUNCTION CONNECTOR - NO. 3 JUNCTION CONNECTOR)

   OK

   REPLACE NO. 4 JUNCTION CONNECTOR

8. CONNECT CONNECTOR

   
   

   1. Reconnect the H126 No. 3 junction connector.

   
   

   NEXT

9. CHECK FOR OPEN IN CAN BUS MAIN WIRE (POWER MANAGEMENT CONTROL ECU - NO. 3 JUNCTION CONNECTOR)

   
   
   1. 

      Text in Illustration

      *a	Rear view of wire harness connector (to Power Management Control ECU)

      Disconnect the power management control ECU connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition H71-26 (CA2H) - H71-25 (CA2L) Ignition switch off 108 to 132 Ω

      Result

      Result	Proceed to
      OK (for LHD)	A
      OK (for RHD)	B
      NG	C

   
   

   B

   REPLACE POWER MANAGEMENT CONTROL ECU Click here

   C

   REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO POWER MANAGEMENT CONTROL ECU (POWER MANAGEMENT CONTROL ECU - NO. 3 JUNCTION CONNECTOR)

   A

   REPLACE POWER MANAGEMENT CONTROL ECU Click here

10. CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR - DRIVING SUPPORT ECU ASSEMBLY)

    Note

    For vehicles without a 1WW engine type and cruise control system, go to "Check for Short in CAN Bus Wires (No. 3 Junction Connector - No. 4 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 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 H126-9 (CANH) - H126-20 (CANL) Ignition switch off 200 Ω or higher H126-9 (CANH) - H16-4 (CG) Ignition switch off 200 Ω or higher H126-20 (CANL) - H16-4 (CG) Ignition switch off 200 Ω or higher H126-9 (CANH) - H16-16 (BAT) Ignition switch off 6 kΩ or higher H126-20 (CANL) - H16-16 (BAT) Ignition switch off 6 kΩ or higher

    
    

    NG

    CONNECT CONNECTOR Click here

    OK

11. CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR - NO. 4 JUNCTION CONNECTOR)

    
    
    1. 

       Text in Illustration

       *a	Rear view of wire harness connector (to No. 3 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 H126-11 (CANH) - H126-22 (CANL) Ignition switch off 108 to 132 Ω H126-11 (CANH) - H16-4 (CG) Ignition switch off 200 Ω or higher H126-22 (CANL) - H16-4 (CG) Ignition switch off 200 Ω or higher H126-11 (CANH) - H16-16 (BAT) Ignition switch off 6 kΩ or higher H126-22 (CANL) - H16-16 (BAT) Ignition switch off 6 kΩ or higher

    
    

    NG

    CONNECT CONNECTOR Click here

    OK

12. CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR - POWER MANAGEMENT CONTROL ECU)

    
    
    1. 

       Text in Illustration

       *a	Rear view of wire harness connector (to No. 3 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 H126-10 (CANH) - H126-21 (CANL) Ignition switch off 108 to 132 Ω H126-10 (CANH) - H16-4 (CG) Ignition switch off 200 Ω or higher H126-21 (CANL) - H16-4 (CG) Ignition switch off 200 Ω or higher H126-10 (CANH) - H16-16 (BAT) Ignition switch off 6 kΩ or higher H126-21 (CANL) - H16-16 (BAT) Ignition switch off 6 kΩ or higher

    
    

    NG

    CONNECT CONNECTOR Click here

    OK

    REPLACE NO. 3 JUNCTION CONNECTOR

13. CONNECT CONNECTOR

    
    

    1. Reconnect the H126 No. 3 junction connector.

    
    

    NEXT

14. CHECK FOR SHORT IN CAN BUS WIRES (DRIVING SUPPORT ECU ASSEMBLY)

    
    
    1. 

       Text in Illustration

       *a	Rear view of wire harness connector (to Driving Support ECU Assembly)
       *b	Front view of DLC3

       Disconnect the driving support ECU assembly connector.

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

       Standard Resistance
       Tester Connection Switch Condition Specified Condition H124-39 (CA2H) - H124-17 (CA2L) Ignition switch off 54 to 69 Ω H124-39 (CA2H) - H16-4 (CG) Ignition switch off 200 Ω or higher H124-17 (CA2L) - H16-4 (CG) Ignition switch off 200 Ω or higher H124-39 (CA2H) - H16-16 (BAT) Ignition switch off 6 kΩ or higher H124-17 (CA2L) - H16-16 (BAT) Ignition switch off 6 kΩ or higher

       Result

       Result	Proceed to
       OK (for LHD)	A
       OK (for RHD)	B
       NG	C

    
    

    B

    REPLACE DRIVING SUPPORT ECU ASSEMBLY Click here

    C

    REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTED TO DRIVING SUPPORT ECU ASSEMBLY (CA2H, CA2L)

    A

    REPLACE DRIVING SUPPORT ECU ASSEMBLY Click here

15. CONNECT CONNECTOR

    
    

    1. Reconnect the H126 No. 3 junction connector.

    
    

    NEXT

16. CHECK FOR SHORT IN CAN BUS WIRES (NO. 4 JUNCTION CONNECTOR)

    
    
    1. 

       Text in Illustration

       *a	Rear view of wire harness connector (to No. 4 Junction Connector)
       *b	Front view of DLC3

       Disconnect the No. 4 junction connector.

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

       Standard Resistance
       Tester Connection Switch Condition Specified Condition H125-3 (CANH) - H125-2 (CANL) Ignition switch off 108 to 132 Ω H125-3 (CANH) - H16-4 (CG) Ignition switch off 200 Ω or higher H125-2 (CANL) - H16-4 (CG) Ignition switch off 200 Ω or higher H125-3 (CANH) - H16-16 (BAT) Ignition switch off 6 kΩ or higher H125-2 (CANL) - H16-16 (BAT) Ignition switch off 6 kΩ or higher

    
    

    NG

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 4 JUNCTION CONNECTOR - NO. 3 JUNCTION CONNECTOR)

    OK

    REPLACE NO. 4 JUNCTION CONNECTOR

17. CONNECT CONNECTOR

    
    

    1. Reconnect the H126 No. 3 junction connector.

    
    

    NEXT

18. CHECK FOR SHORT IN CAN BUS WIRES (POWER MANAGEMENT CONTROL ECU)

    
    
    1. 

       Text in Illustration

       *a	Rear view of wire harness connector (to Power Management Control ECU)
       *b	Front view of DLC3

       Disconnect the power management control ECU connector.

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

       Standard Resistance
       Tester Connection Switch Condition Specified Condition H71-26 (CA2H) - H71-25 (CA2L) Ignition switch off 108 to 132 Ω H71-26 (CA2H) - H16-4 (CG) Ignition switch off 200 Ω or higher H71-25 (CA2L) - H16-4 (CG) Ignition switch off 200 Ω or higher H71-26 (CA2H) - H16-16 (BAT) Ignition switch off 6 kΩ or higher H71-25 (CA2L) - H16-16 (BAT) Ignition switch off 6 kΩ or higher

       Result

       Result	Proceed to
       OK (for LHD)	A
       OK (for RHD)	B
       NG	C

    
    

    B

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    C

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTED TO POWER MANAGEMENT CONTROL ECU (CA2H, CA2L)

    A

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

19. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - BATTERY AND GROUND)

    
    
    1. 

       Text in Illustration

       *a	Rear view of wire harness connector (to Power Management Control 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 power management control ECU connector.

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

       Standard Resistance
       Tester Connection Condition Specified Condition H71-5 (GND2) - Body ground Always Below 1 Ω H71-6 (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 H71-1 (AM22) - Body ground Always 11 to 14 V H71-2 (AM21) - Body ground Always 11 to 14 V

       Result

       Result	Proceed to
       OK (for LHD)	A
       OK (for RHD)	B
       NG	C

    
    

    B

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    A

    REPLACE POWER MANAGEMENT CONTROL ECU Click here