CAN COMMUNICATION SYSTEM, Diagnostic DTC:U1002

DTC Code DTC Name
U1002 Lost Communication with Gateway Module

DESCRIPTION


DTC No. DTC Detection Condition Trouble Area
U1002 Power management control ECU* cannot receive signals from all ECUs that have been memorized as those connected to the power management bus.

  • Power management bus circuit

  • Power source circuit of power management control ECU

  • ECM main wire or connector

  • Power management control ECU main wire or connector

  • ECM

  • Power management control ECU*

*: for 1KR-FE and 1NR-FE with Entry and Start System

WIRING DIAGRAM

A0119FVE03

INSPECTION PROCEDURE

Note


  • Inspect the fuses for circuit related to this system before performing the following inspection procedure.

  • Turn the ignition switch off before measuring the resistances of the power management bus wire.

  • After the ignition switch is turned off, check that the key reminder warning system and light reminder warning system are not in operation.

  • Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches or the doors. If doors need to be opened in order to check connectors, open the doors and leave them open.

Tech Tips

Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

PROCEDURE


  1. CHECK CAN BUS WIRE (ECM - POWER MANAGEMENT CONTROL ECU)


    1. A011BG1E01
      Text in Illustration
      *1

      Compartment 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
      D38-12 (CA3P) - D38-11 (CA3N) Ignition switch off 54 to 69 Ω
      Result
      Result Proceed to

      NG

      (70 Ω or higher)

      		 A

      NG

      (53 Ω or less)

      		 B
      OK C
      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D38-12 (CA3P) - D38-1 (AM22) or D38-2 (AM21) Ignition switch off 6 kΩ or higher
      D38-11 (CA3N) - D38-1 (AM22) or D38-2 (AM21) Ignition switch off 6 kΩ or higher
      Result
      Result Proceed to
      NG B
      OK C
      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D38-12 (CA3P) - D38-5 (GND2) or D38-6 (GND) Ignition switch off 200 Ω or higher
      D38-11 (CA3N) - D38-5 (GND2) or D38-6 (GND) Ignition switch off 200 Ω or higher
      Result
      Result Proceed to
      NG B
      OK C

    B

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

    C

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

    A

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


    1. A011AITE11
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Power Management Control ECU)

      Disconnect the D38 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
      D38-12 (CA3P) - D38-11 (CA3N) Ignition switch off 108 to 132 Ω

    NG

    CONNECT CONNECTOR Click here

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

  3. CONNECT CONNECTOR


    1. Reconnect the power management control ECU connector.


    NEXT

  4. CHECK FOR OPEN IN CAN BUS WIRE (ECM)


    1. A011AONE03
      Text in Illustration
      *1

      Front view of wire harness connector

      (to ECM)

      Disconnect the A18 ECM connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A18-4 (CAN+) - A18-5 (CAN-) Ignition switch off 108 to 132 Ω
      Result
      Result Proceed to
      NG A
      OK (for 1KR-FE engine) B
      OK (for 1NR-FE engine) C

    B

    REPLACE ECM Click here

    C

    REPLACE ECM Click here

    A

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (CAN-H, CAN-L)

  5. CHECK FOR SHORT IN CAN BUS WIRE (POWER MANAGEMENT CONTROL ECU)


    1. A011A8PE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Power Management Control ECU)
      *2 Front view of DLC3

      Disconnect the D38 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
      D38-12 (CA3P) - D38-11 (CA3N) Ignition switch off 108 to 132 Ω
      D38-12 (CA3P) - D47-16 (BAT) Ignition switch off 6 kΩ or higher
      D38-11 (CA3N) - D47-16 (BAT) Ignition switch off 6 kΩ or higher
      D38-12 (CA3P) - D47-4 (CG) Ignition switch off 200 Ω or higher
      D38-11 (CA3N) - D47-4 (CG) Ignition switch off 200 Ω or higher

    NG

    CONNECT CONNECTOR Click here

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

  6. CONNECT CONNECTOR


    1. Reconnect the power management control ECU connector.


    NEXT

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


    1. A011A0GE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to ECM)
      *2 Front view of DLC3

      Disconnect the A18 ECM connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A18-4 (CAN+) - A18-5 (CAN-) Ignition switch off 108 to 132 Ω
      A18-4 (CAN+) - D47-16 (BAT) Ignition switch off 6 kΩ or higher
      A18-5 (CAN-) - D47-16 (BAT) Ignition switch off 6 kΩ or higher
      A18-4 (CAN+) - D47-4 (CG) Ignition switch off 200 Ω or higher
      A18-5 (CAN-) - D47-4 (CG) Ignition switch off 200 Ω or higher
      Result
      Result Proceed to
      NG A
      OK (for 1KR-FE engine) B
      OK (for 1NR-FE engine) C

    B

    REPLACE ECM Click here

    C

    REPLACE ECM Click here

    A

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (CAN-H, CAN-L)

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


    1. A011AITE12
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Power Management Control ECU)

      Disconnect the D38 power management control ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D38-5 (GND2) - Body ground Always Below 1 Ω
      D38-6 (GND) - Body ground Always Below 1 Ω

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      D38-2 (AM21) - Body ground Always 11 to 14 V
      D38-1 (AM22) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here