CAN COMMUNICATION SYSTEM, Diagnostic DTC:U1002

DTC Code DTC Name
U1002 Lost Communication with Gateway Module (Power Management2)

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.

  • Open or short in power management bus main wire or connector

  • Open or short in power management bus branch wire or connector

  • Power management control ECU

  • ECM

  • Air conditioning amplifier

  • CAN No. 1 junction connector

WIRING DIAGRAM

A019M6VE01

INSPECTION PROCEDURE

Note


  • Turn the engine switch off before measuring the resistances between CAN bus main wires and between CAN bus branch wires.

  • Turn the engine switch off before inspecting CAN bus wires for a ground short.

  • After the engine switch is turned off, check that the key reminder warning system and light reminder warning system are not operating.

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

Tech Tips


  • Operating the engine switch, any other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.

  • Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.

PROCEDURE


  1. CHECK CAN BUS WIRE


    1. Turn the engine switch off.

    2. A019O03E07
      Text in Illustration
      *1

      Component with harness connector

      (Power Management Control ECU)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition Result
      F8-12 (CA3P) - F8-11 (CA3N) Engine switch off 54 to 69 Ω

      Below 54 Ω:

      Short circuit between bus lines

      70 Ω or higher:

      Open circuit in a main bus line
      F8-12 (CA3P) - F8-6 (GND) Engine switch off 200 Ω or higher

      Below 200 Ω:

      CANH ground short
      F8-11 (CA3N) - F8-6 (GND) Engine switch off 200 Ω or higher

      Below 200 Ω:

      CANL ground short

    3. Disconnect the cable from the negative (-) battery terminal.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Result
      F8-12 (CA3P) - F8-1 (AM22) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANH +B short
      F8-11 (CA3N) - F8-1 (AM22) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANL +B short
      Result
      Result Proceed to
      OK A
      Open circuit in CAN main bus wire B
      Short circuit between bus lines C

      • Ground short

      • +B short

      		 D

    B

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

    C

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

    D

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

    A

    REPLACE POWER MANAGEMENT CONTROL ECU

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


    1. A019M6TE25
      Text in Illustration
      *1

      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
      F8-12 (CA3P) - F8-11 (CA3N) Engine switch off 108 to 132 Ω

    NG

    CHECK FOR OPEN IN CAN BUS WIRE (ECM) Click here

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU

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


    1. Reconnect the power management control ECU connector.

    2. A019OJ1E50
      Text in Illustration
      *A for 2GR-FE
      *B for 1AR-FE
      *1

      Front view of wire harness connector

      (to ECM)

      Disconnect the ECM connector.

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

      Standard Resistance (for 2GR-FE)
      Tester Connection Switch Condition Specified Condition
      A43-8 (CANP) - A43-9 (CANN) Engine switch off 108 to 132 Ω
      Standard Resistance (for 1AR-FE)
      Tester Connection Switch Condition Specified Condition
      A70-12 (CANP) - A70-4 (CANN) Engine switch off 108 to 132 Ω
      Result
      Result Proceed to
      OK (for 2GR-FE) A
      OK (for 1AR-FE) B
      NG C

    B

    REPLACE ECM

    C

    CHECK FOR OPEN IN CAN BUS WIRE (CAN NO. 7 J/C MAIN WIRE) Click here

    A

    REPLACE ECM

  4. CHECK FOR OPEN IN CAN BUS WIRE (CAN NO. 7 J/C MAIN WIRE)


    1. Reconnect the ECM connector.

    2. A019M7SE59
      Text in Illustration
      *1

      Front view of wire harness connector

      (to CAN No. 7 Junction Connector)
      *2 to Power Management Control ECU
      *3 to ECM

      Disconnect the CAN No. 7 junction connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F72-2 (CANH) - F72-13 (CANL) Engine switch off 108 to 132 Ω
      F72-3 (CANH) - F72-14 (CANL) Engine switch off 108 to 132 Ω
      Result
      Result Proceed to
      OK A
      NG (to ECM main wire) B
      NG (to Power management control ECU main wire) C

    B

    REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (CAN NO. 7 J/C - ECM)

    C

    REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (CAN NO. 7 J/C - POWER MANAGEMENT CONTROL ECU)

    A

    REPLACE CAN NO. 7 JUNCTION CONNECTOR

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


    1. A019M6TE25
      Text in Illustration
      *1

      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
      F8-12 (CA3P) - F8-11 (CA3N) Engine switch off 108 to 132 Ω

    NG

    CHECK FOR SHORT IN CAN BUS WIRES (ECM) Click here

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU

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


    1. Reconnect the power management control ECU connector.

    2. A019OJ1E50
      Text in Illustration
      *A for 2GR-FE
      *B for 1AR-FE
      *1

      Front view of wire harness connector

      (to ECM)

      Disconnect the ECM connector.

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

      Standard Resistance (for 2GR-FE)
      Tester Connection Switch Condition Specified Condition
      A43-8 (CANP) - A43-9 (CANN) Engine switch off 108 to 132 Ω
      Standard Resistance (for 1AR-FE)
      Tester Connection Switch Condition Specified Condition
      A70-12 (CANP) - A70-4 (CANN) Engine switch off 108 to 132 Ω
      Result
      Result Proceed to
      OK (for 2GR-FE) A
      OK (for 1AR-FE) B
      NG C

    B

    REPLACE ECM

    C

    CHECK FOR SHORT IN CAN MS BUS MAIN WIRE (CAN NO. 7 J/C MAIN WIRE) Click here

    A

    REPLACE ECM

  7. CHECK FOR SHORT IN CAN MS BUS MAIN WIRE (CAN NO. 7 J/C MAIN WIRE)


    1. Reconnect the ECM connector.

    2. A019M7SE59
      Text in Illustration
      *1

      Front view of wire harness connector

      (to CAN No. 7 Junction Connector)
      *2 to Power Management Control ECU
      *3 to ECM

      Disconnect the CAN No. 7 junction connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F72-2 (CANH) - F72-13 (CANL) Engine switch off 108 to 132 Ω
      F72-3 (CANH) - F72-14 (CANL) Engine switch off 108 to 132 Ω
      Result
      Result Proceed to
      OK A
      NG (to ECM main wire) B
      NG (to Power management control ECU main wire) C

    B

    REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (CAN NO. 7 J/C - ECM)

    C

    REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (CAN NO. 7 J/C - POWER MANAGEMENT CONTROL ECU)

    A

  8. CHECK FOR SHORT IN CAN BUS WIRES (CAN NO. 7 J/C - A/C ECU)


    1. Disconnect the air conditioning amplifier connector.

    2. A019M7SE60
      Text in Illustration
      *1

      Front view of wire harness connector

      (to CAN No. 7 Junction Connector)
      *2 to Air Conditioning Amplifier

      Disconnect the CAN No. 7 junction connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F72-1 (CANH) - F72-12 (CANL) Engine switch off 1 MΩ or higher

    NG

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 7 J/C - A/C ECU)

    OK

    REPLACE AIR CONDITIONING AMPLIFIER

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


    1. A019M6TE24
      Text in Illustration
      *1

      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 Condition Specified Condition Purpose
      F8-12 (CA3P) - F8-6 (GND) Engine switch off 200 Ω or higher Inspection for CANH ground short
      F8-11 (CA3N) - F8-6 (GND) Engine switch off 200 Ω or higher Inspection for CANL ground short
      F8-12 (CA3P) - F8-1 (AM22) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANH +B short
      F8-11 (CA3N) - F8-1 (AM22) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANL +B short

      Tech Tips

      It is only necessary to perform the inspection in the above table for the result (open or short circuit) that was obtained in the Check CAN Bus Wire inspection.

      Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check CAN Bus Wire inspection.


    NG

    CHECK FOR SHORT IN CAN BUS WIRES (ECM) Click here

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU

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


    1. Disconnect the ECM connectors.

      A019ND7E02
      Text in Illustration
      *A for 2GR-FE
      *B for 1AR-FE
      *1 Front view of wire harness connector (to ECM)
      *2 DLC3

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

      Standard Resistance (for 2GR-FE)
      Tester Connection Condition Specified Condition Purpose
      A43-8 (CANP) - F17-4 (CG) Engine switch off 200 Ω or higher Inspection for CANH ground short
      A43-9 (CANN) - F17-4 (CG) Engine switch off 200 Ω or higher Inspection for CANL ground short
      A43-8 (CANP) - F17-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANH +B short
      A43-9 (CANN) - F17-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANL +B short
      Standard Resistance (for 1AR-FE)
      Tester Connection Condition Specified Condition Purpose
      A70-12 (CANP) - F17-4 (CG) Engine switch off 200 Ω or higher Inspection for CANH ground short
      A70-4 (CANN) - F17-4 (CG) Engine switch off 200 Ω or higher Inspection for CANL ground short
      A70-12 (CANP) - F17-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANH +B short
      A70-4 (CANN) - F17-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANL +B short

      Tech Tips

      It is only necessary to perform the inspection in the above table for the result (open or short circuit) that was obtained in the Check CAN Bus Wire inspection.

      Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check CAN Bus Wire inspection.

      Result
      Result Proceed to
      OK (for 2GR-FE) A
      OK (for 1AR-FE) B
      NG C

    B

    REPLACE ECM

    C

    CHECK FOR SHORT IN CAN BUS WIRES (CAN NO. 7 J/C MAIN WIRE) Click here

    A

    REPLACE ECM

  11. CHECK FOR SHORT IN CAN BUS WIRES (CAN NO. 7 J/C MAIN WIRE)


    1. A019O1ZE53
      Text in Illustration
      *1

      Front view of wire harness connector

      (to CAN No. 7 junction connector)
      *2 to Power Management Control ECU
      *3 to ECM
      *4 DLC3

      Disconnect the CAN No. 7 junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Purpose Connected to
      F72-2 (CANH) - F17-4 (CG) Engine switch off 200 Ω or higher Inspection for CANH ground short Power management control ECU
      F72-13 (CANL) - F17-4 (CG) Engine switch off 200 Ω or higher Inspection for CANL ground short
      F72-2 (CANH) - F17-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANH +B short
      F72-13 (CANL) - F17-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANL +B short
      F72-3 (CANH) - F17-4 (CG) Engine switch off 200 Ω or higher Inspection for CANH ground short ECM
      F72-14 (CANL) - F17-4 (CG) Engine switch off 200 Ω or higher Inspection for CANL ground short
      F72-3 (CANH) - F17-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANH +B short
      F72-14 (CANL) - F17-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANL +B short

      Tech Tips

      It is only necessary to perform the inspection in the above table for the result (open or short circuit) that was obtained in the Check CAN Bus Wire inspection.

      Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check CAN Bus Wire inspection.

      Result
      Result Proceed to
      OK A
      NG (to ECM main wire) B
      NG (to Power management control ECU main wire) C

    B

    REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (CAN NO. 7 J/C - ECM)

    C

    REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (CAN NO. 7 J/C - POWER MANAGEMENT CONTROL ECU)

    A

  12. CHECK FOR SHORT IN CAN BUS WIRES (CAN NO. 7 J/C - A/C ECU)


    1. Disconnect the air conditioning amplifier connector.

    2. A019O1ZE55
      Text in Illustration
      *1

      Front view of wire harness connector

      (to CAN No. 7 junction connector)
      *2 to Air Conditioning Amplifier
      *3 DLC3

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

      Standard Resistance
      Tester Connection Condition Specified Condition Purpose
      F72-1 (CANH) - F17-4 (CG) Engine switch off 200 Ω or higher Inspection for CANH ground short
      F72-12 (CANL) - F17-4 (CG) Engine switch off 200 Ω or higher Inspection for CANL ground short
      F72-1 (CANH) - F17-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANH +B short
      F72-12 (CANL) - F17-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANL +B short

      Tech Tips

      It is only necessary to perform the inspection in the above table for the result (open or short circuit) that was obtained in the Check CAN Bus Wire inspection.

      Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check CAN Bus Wire inspection.


    NG

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 7 J/C - A/C ECU)

    OK

    REPLACE AIR CONDITIONING AMPLIFIER