CAN COMMUNICATION SYSTEM(for LHD with Entry and Start 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 control 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 [branch wire]/CANL [branch wire] of the ECU and/or sensor is open).

WIRING DIAGRAM

for 1GR-FE and Manual Transmission System

*1	Air Conditioning Amplifier Assembly
*2	No. 1 Junction Connector
*3	Power Management Control ECU

for 1KD-FTV

*1	Air Conditioning Amplifier Assembly
*2	No. 1 Junction Connector
*3	Power Management Control ECU

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 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 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 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 (MAIN WIRE FOR DISCONNECTION, 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 G51-12 (CA3P) - G51-11 (CA3N) Engine switch off 54 to 69 Ω Below 53 Ω: Short in line G51-12 (CA3P) - G51-11 (CA3N) Engine switch off 54 to 69 Ω Higher than 70 Ω: Open in CAN main bus line G51-12 (CA3P) - G51-1 (AM22) Engine switch off 6 kΩ or higher Below 6 kΩ: +B short G51-11 (CA3N) - G51-1 (AM22) Engine switch off 6 kΩ or higher Below 6 kΩ: +B short G51-12 (CA3P) - G51-6 (GND) Engine switch off 200 Ω or higher Below 200 Ω: Ground short G51-11 (CA3N) - G51-6 (GND) Engine 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. 1 JUNCTION CONNECTOR - AIR CONDITIONING AMPLIFIER ASSEMBLY) Click here

   C

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

   A

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

   
   
   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 G98-9 (CANH) - G98-20 (CANL) Engine switch off 108 to 132 Ω

   
   

   NG

   CONNECT CONNECTOR Click here

   OK

4. CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 1 JUNCTION CONNECTOR - POWER MANAGEMENT CONTROL ECU)

   
   
   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 G98-11 (CANH) - G98-22 (CANL) Engine switch off 108 to 132 Ω

   
   

   OK

   REPLACE NO. 1 JUNCTION CONNECTOR

   NG

   CONNECT CONNECTOR Click here

5. CONNECT CONNECTOR

   
   

   1. Reconnect the G98 No. 1 junction connector.

   
   

   NEXT

6. CHECK FOR OPEN IN CAN BUS MAIN WIRE (ECM - NO. 1 JUNCTION CONNECTOR)

   
   

   1. Disconnect the G56*1 or G57*2 ECM connector.

      
      

      • *1: for 1GR-FE and Manual Transmission System

      • *2: for 1KD-FTV

      

      Text in Illustration

      *A	for 1GR-FE and Manual Transmission System	*B	for 1KD-FTV
      *a	Front view of wire harness connector (to ECM)	-	-

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

      Standard Resistance
      for 1GR-FE and Manual Transmission System Tester Connection Switch Condition Specified Condition G56-34 (CANP) - G56-33 (CANN) Engine switch off 108 to 132 Ω
      for 1KD-FTV Tester Connection Switch Condition Specified Condition G57-20 (CANP) - G57-21 (CANN) Engine switch off 108 to 132 Ω

      Result

      Result	Proceed to
      OK (for 1GR-FE)	A
      OK (for 1KD-FTV)	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. 1 JUNCTION CONNECTOR)

7. CONNECT CONNECTOR

   
   

   1. Reconnect the G98 No. 1 junction connector.

   
   

   NEXT

8. CHECK FOR OPEN IN CAN BUS MAIN WIRE (POWER MANAGEMENT CONTROL ECU - NO. 1 JUNCTION CONNECTOR)

   
   
   1. 

      Text in Illustration

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

      Disconnect the G51 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 G51-12 (CA3P) - G51-11 (CA3N) Engine 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. 1 JUNCTION CONNECTOR)

9. CHECK FOR SHORT IN CAN BUS WIRES (NO. 1 JUNCTION CONNECTOR - AIR CONDITIONING AMPLIFIER ASSEMBLY)

   
   
   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 G98-10 (CANH) - G98-21 (CANL) Engine switch off 200 Ω or higher G98-10 (CANH) - G48-4 (CG) Engine switch off 200 Ω or higher G98-21 (CANL) - G48-4 (CG) Engine switch off 200 Ω or higher G98-10 (CANH) - G48-16 (BAT) Engine switch off 6 kΩ or higher G98-21 (CANL) - G48-16 (BAT) Engine switch off 6 kΩ or higher

   
   

   NG

   CONNECT CONNECTOR Click here

   OK

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

    
    
    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 G98-9 (CANH) - G98-20 (CANL) Engine switch off 108 to 132 Ω G98-9 (CANH) - G48-4 (CG) Engine switch off 200 Ω or higher G98-20 (CANL) - G48-4 (CG) Engine switch off 200 Ω or higher G98-9 (CANH) - G48-16 (BAT) Engine switch off 6 kΩ or higher G98-20 (CANL) - G48-16 (BAT) Engine switch off 6 kΩ or higher

    
    

    NG

    CONNECT CONNECTOR Click here

    OK

11. CHECK FOR SHORT IN CAN BUS WIRES (NO. 1 JUNCTION CONNECTOR - POWER MANAGEMENT CONTROL 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 G98-11 (CANH) - G98-22 (CANL) Engine switch off 108 to 132 Ω G98-11 (CANH) - G48-4 (CG) Engine switch off 200 Ω or higher G98-22 (CANL) - G48-4 (CG) Engine switch off 200 Ω or higher G98-11 (CANH) - G48-16 (BAT) Engine switch off 6 kΩ or higher G98-22 (CANL) - G48-16 (BAT) Engine switch off 6 kΩ or higher

    
    

    OK

    REPLACE NO. 1 JUNCTION CONNECTOR

    NG

    CONNECT CONNECTOR Click here

12. CONNECT CONNECTOR

    
    

    1. Reconnect the G98 No. 1 junction connector.

    
    

    NEXT

13. CHECK FOR SHORT IN CAN BUS WIRES (AIR CONDITIONING AMPLIFIER ASSEMBLY)

    
    
    1. 

       Text in Illustration

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

       Disconnect the G25 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 G25-11 (CANH) - G25-12 (CANL) Engine switch off 54 to 69 Ω G25-11 (CANH) - G48-4 (CG) Engine switch off 200 Ω or higher G25-12 (CANL) - G48-4 (CG) Engine switch off 200 Ω or higher G25-11 (CANH) - G48-16 (BAT) Engine switch off 6 kΩ or higher G25-12 (CANL) - G48-16 (BAT) Engine switch off 6 kΩ or higher

    
    

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY BRANCH WIRE OR CONNECTOR (CANH, CANL)

14. CONNECT CONNECTOR

    
    

    1. Reconnect the G98 No. 1 junction connector.

    
    

    NEXT

15. CHECK FOR SHORT IN CAN BUS WIRES (ECM)

    
    

    1. for 1GR-FE and Manual Transmission System:

       
       
       1. 

          Text in Illustration

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

          Disconnect the G56 ECM connector.

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

          Standard Resistance
          Tester Connection Switch Condition Specified Condition G56-34 (CANP) - G56-33 (CANN) Engine switch off 108 to 132 Ω G56-34 (CANP) - G48-4 (CG) Engine switch off 200 Ω or higher G56-33 (CANN) - G48-4 (CG) Engine switch off 200 Ω or higher G56-34 (CANP) - G48-16 (BAT) Engine switch off 6 kΩ or higher G56-33 (CANN) - G48-16 (BAT) Engine switch off 6 kΩ or higher

    2. for 1KD-FTV:

       
       
       1. 

          Text in Illustration

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

          Disconnect the G57 ECM connector.

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

          Standard Resistance
          Tester Connection Switch Condition Specified Condition G57-20 (CANP) - G57-21 (CANN) Engine switch off 108 to 132 Ω G57-20 (CANP) - G48-4 (CG) Engine switch off 200 Ω or higher G57-21 (CANN) - G48-4 (CG) Engine switch off 200 Ω or higher G57-20 (CANP) - G48-16 (BAT) Engine switch off 6 kΩ or higher G57-21 (CANN) - G48-16 (BAT) Engine switch off 6 kΩ or higher

       Result

       Result	Proceed to
       OK (for 1GR-FE)	A
       OK (for 1KD-FTV)	B
       NG	C

    
    

    A

    REPLACE ECM Click here

    B

    REPLACE ECM Click here

    C

    REPAIR OR REPLACE ECM MAIN WIRE OR CONNECTOR (CANP, CANN)

16. CONNECT CONNECTOR

    
    

    1. Reconnect the G98 No. 1 junction connector.

    
    

    NEXT

17. 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 G51 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 G51-12 (CA3P) - G51-11 (CA3N) Engine switch off 108 to 132 Ω G51-12 (CA3P) - G48-4 (CG) Engine switch off 200 Ω or higher G51-11 (CA3N) - G48-4 (CG) Engine switch off 200 Ω or higher G51-12 (CA3P) - G48-16 (BAT) Engine switch off 6 kΩ or higher G51-11 (CA3N) - G48-16 (BAT) Engine switch off 6 kΩ or higher

    
    

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    NG

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

18. 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 G51 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 G51-5 (GND2) - Body ground Always Below 1 Ω G51-6 (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 G51-1 (AM22) - Body ground Always 11 to 14 V G51-2 (AM21) - Body ground Always 11 to 14 V

    
    

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR