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 power management bus.

• When the power management control ECU receives a response signal from the ECUs connected to the power management bus, the power management ECU recognizes and memorizes that the ECU is connected to the power management bus. Based on this memorized data, the power management control ECU monitors for malfunctions in the ECUs connected to the power management 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 power management 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).

• *: w/ Entry and Start System

WIRING DIAGRAM

CAUTION / NOTICE / HINT

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 the 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 VEHICLE CONDITION

   
   

   1. Check the vehicle condition.

      Result

      Result	Proceed to
      w/ Entry and Start System	A
      w/o Entry and Start System	B

   
   

   B

   CHECK FOR OPEN IN CAN BUS WIRE (POWER MANAGEMENT CONTROL ECU CAN MAIN WIRE) Click here

   A

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

   
   
   1. 

      Text in Illustration

      *a	Component with harness connected (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 D111-12 (CA3P) - D111-11 (CA3N) Ignition switch off 54 to 69 Ω Below 54 Ω: Short in line D111-12 (CA3P) - D111-11 (CA3N) Ignition switch off 54 to 69 Ω Higher than 69 Ω: Open in CAN main bus line D111-12 (CA3P) - D111-2 (AM21) Ignition switch off 6 kΩ or higher Below 6 kΩ: +B short D111-11 (CA3N) - D111-2 (AM21) Ignition switch off 6 kΩ or higher Below 6 kΩ: +B short D111-12 (CA3P) - D111-6 (GND) Ignition switch off 200 Ω or higher Below 200 Ω: Ground short D111-11 (CA3N) - D111-6 (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 GND short	B
      OK	C

   
   

   B

   CHECK FOR SHORT IN CAN BUS WIRE (NO. 4 JUNCTION CONNECTOR - AIR CONDITIONING AMPLIFIER ASSEMBLY) Click here

   C

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

   A

5. CHECK FOR OPEN IN CAN BUS WIRE (NO. 4 JUNCTION CONNECTOR - ECM)

   
   
   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 D91-3 (CANH) - D91-14 (CANL) Ignition switch off 108 to 132 Ω

   
   

   NG

   CONNECT CONNECTOR Click here

   OK

6. CHECK FOR OPEN IN CAN BUS WIRE (NO. 4 JUNCTION CONNECTOR - POWER MANAGEMENT CONTROL ECU)

   
   
   1. 

      Text in Illustration

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

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition D91-2 (CANH) - D91-13 (CANL) Ignition switch off 108 to 132 Ω

   
   

   OK

   REPLACE NO. 4 JUNCTION CONNECTOR

   NG

   CONNECT CONNECTOR Click here

7. CONNECT CONNECTOR

   
   

   1. Reconnect the D91 No. 4 junction connector.

   
   

   NEXT

8. CHECK FOR OPEN IN CAN BUS WIRE (ECM - NO. 4 JUNCTION CONNECTOR)

   
   
   1. 

      Text in Illustration

      *a	Front view of wire harness connector (to ECM)

      Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition A83-13 (CANP) - A83-12 (CANN) Ignition switch off 108 to 132 Ω

      Result

      Result	Proceed to
      OK (for 1WW)	A
      OK (for 2WW)	B
      NG	C

   
   

   A

   REPLACE ECM Click here

   B

   REPLACE ECM Click here

   C

   REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO ECM (ECM - NO. 4 JUNCTION CONNECTOR)

9. CONNECT CONNECTOR

   
   

   1. Reconnect the D91 No. 4 junction connector.

   
   

   NEXT

10. CHECK FOR OPEN IN CAN BUS WIRE (POWER MANAGEMENT CONTROL ECU - NO. 4 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 D111-12 (CA3P) - D111-11 (CA3N) Ignition switch off 108 to 132 Ω

    
    

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    NG

    REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO POWER MANAGEMENT CONTROL ECU (POWER MANAGEMENT CONTROL ECU - NO. 4 JUNCTION CONNECTOR)

11. CHECK FOR SHORT IN CAN BUS WIRE (NO. 4 JUNCTION CONNECTOR - AIR CONDITIONING AMPLIFIER ASSEMBLY)

    
    
    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 D91-1 (CANH) - D91-12 (CANL) Ignition switch off 200 Ω or higher D91-1 (CANH) - D8-4 (CG) Ignition switch off 200 Ω or higher D91-12 (CANL) - D8-4 (CG) Ignition switch off 200 Ω or higher D91-1 (CANH) - D8-16 (BAT) Ignition switch off 6 kΩ or higher D91-12 (CANL) - D8-16 (BAT) Ignition switch off 6 kΩ or higher

    
    

    NG

    CONNECT CONNECTOR Click here

    OK

12. CHECK FOR SHORT IN CAN BUS WIRE (NO. 4 JUNCTION CONNECTOR - ECM)

    
    
    1. 

       Text in Illustration

       *a	Rear view of wire harness connector (to No. 4 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 D91-3 (CANH) - D91-14 (CANL) Ignition switch off 108 to 132 Ω D91-3 (CANH) - D8-4 (CG) Ignition switch off 200 Ω or higher D91-14 (CANL) - D8-4 (CG) Ignition switch off 200 Ω or higher D91-3 (CANH) - D8-16 (BAT) Ignition switch off 6 kΩ or higher D91-14 (CANL) - D8-16 (BAT) Ignition switch off 6 kΩ or higher

    
    

    NG

    CONNECT CONNECTOR Click here

    OK

13. CHECK FOR SHORT IN CAN BUS WIRE (NO. 4 JUNCTION CONNECTOR - POWER MANAGEMENT CONTROL ECU)

    
    
    1. 

       Text in Illustration

       *a	Rear view of wire harness connector (to No. 4 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 D91-2 (CANH) - D91-13 (CANL) Ignition switch off 108 to 132 Ω D91-2 (CANH) - D8-4 (CG) Ignition switch off 200 Ω or higher D91-13 (CANL) - D8-4 (CG) Ignition switch off 200 Ω or higher D91-2 (CANH) - D8-16 (BAT) Ignition switch off 6 kΩ or higher D91-13 (CANL) - D8-16 (BAT) Ignition switch off 6 kΩ or higher

    
    

    OK

    REPLACE NO. 4 JUNCTION CONNECTOR

    NG

    CONNECT CONNECTOR Click here

14. CONNECT CONNECTOR

    
    

    1. Reconnect the D91 No. 4 junction connector.

    
    

    NEXT

15. CHECK FOR SHORT IN CAN BUS WIRE (AIR CONDITIONING AMPLIFIER ASSEMBLY)

    
    
    1. 

       Text in Illustration

       *a	Rear view of wire harness connector (to Air Conditioning Amplifier Assembly)
       *b	Front view of DLC3

       Disconnect the air conditioning amplifier assembly connector.

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

       Standard Resistance
       Tester Connection Switch Condition Specified Condition D47-11 (CANH) - D47-12 (CANL) Ignition switch off 54 to 69 Ω D47-11 (CANH) - D8-4 (CG) Ignition switch off 200 Ω or higher D47-12 (CANL) - D8-4 (CG) Ignition switch off 200 Ω or higher D47-11 (CANH) - D8-16 (BAT) Ignition switch off 6 kΩ or higher D47-12 (CANL) - D8-16 (BAT) Ignition switch off 6 kΩ or higher

    
    

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO AIR CONDITIONING AMPLIFIER ASSEMBLY (CANH, CANL)

16. CONNECT CONNECTOR

    
    

    1. Reconnect the D91 No. 4 junction connector.

    
    

    NEXT

17. CHECK FOR SHORT IN CAN BUS WIRE (ECM)

    
    
    1. 

       Text in Illustration

       *a	Front view of wire harness connector (to ECM)
       *b	Front view of DLC3

       Disconnect the ECM connector.

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

       Standard Resistance
       Tester Connection Switch Condition Specified Condition A83-13 (CANP) - A83-12 (CANN) Ignition switch off 108 to 132 Ω A83-13 (CANP) - D8-4 (CG) Ignition switch off 200 Ω or higher A83-12 (CANN) - D8-4 (CG) Ignition switch off 200 Ω or higher A83-13 (CANP) - D8-16 (BAT) Ignition switch off 6 kΩ or higher A83-12 (CANN) - D8-16 (BAT) Ignition switch off 6 kΩ or higher

       Result

       Result	Proceed to
       OK (for 1WW)	A
       OK (for 2WW)	B
       NG	C

    
    

    A

    REPLACE ECM Click here

    B

    REPLACE ECM Click here

    C

    REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO ECM (CANP, CANN)

18. CONNECT CONNECTOR

    
    

    1. Reconnect the D91 No. 4 junction connector.

    
    

    NEXT

19. CHECK FOR SHORT IN CAN BUS WIRE (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 D111-12 (CA3P) - D111-11 (CA3N) Ignition switch off 108 to 132 Ω D111-12 (CA3P) - D8-4 (CG) Ignition switch off 200 Ω or higher D111-11 (CA3N) - D8-4 (CG) Ignition switch off 200 Ω or higher D111-12 (CA3P) - D8-16 (BAT) Ignition switch off 6 kΩ or higher D111-11 (CA3N) - D8-16 (BAT) Ignition switch off 6 kΩ or higher

    
    

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    NG

    REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO POWER MANAGEMENT CONTROL ECU (CA3P, CA3N)

20. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - BATTERY AND BODY 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 voltage according to the value(s) in the table below.

       Standard Voltage
       Tester Connection Condition Specified Condition D111-2 (AM21) - Body ground Always 11 to 14 V D111-1 (AM22) - Body ground Always 11 to 14 V

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

       Standard Resistance
       Tester Connection Condition Specified Condition D111-6 (GND) - Body ground Always Below 1 Ω D111-5 (GND2) - Body ground Always Below 1 Ω

    
    

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

21. CHECK FOR OPEN IN CAN BUS WIRE (POWER MANAGEMENT CONTROL ECU CAN MAIN WIRE)

    
    
    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 D104-4 (CA3P) - D104-3 (CA3N) Ignition switch off 108 to 132 Ω

    
    

    NG

    REPAIR OR REPLACE POWER MANAGEMENT CONTROL ECU CAN MAIN WIRE OR CONNECTOR (CA3P, CA3N)

    OK

22. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - BATTERY AND BODY 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. Measure the voltage according to the value(s) in the table below.

       Standard Voltage
       Tester Connection Condition Specified Condition D104-8 (AM21) - Body ground Always 11 to 14 V D104-2 (IG2) - Body ground Ignition switch ON 11 to 14 V

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

       Standard Resistance
       Tester Connection Condition Specified Condition D104-12 (GND) - Body ground Always Below 1 Ω

    
    

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR