CAN COMMUNICATION SYSTEM, Diagnostic DTC:U1002

DTC Code DTC Name
U1002 Lost Communication with Gateway Module (Power Management1)

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 V2 bus.

  • Open or short in V2 main bus wire or connector

  • Open or short in V2 main bus branch wire or connector

  • Power management control ECU

  • Transmission control ECU assembly

  • Center airbag sensor assembly

  • Air conditioning amplifier assembly

  • Driving support ECU

  • Seat belt control ECU

  • Parking assist ECU

  • CAN No. 3 junction connector

  • CAN No. 5 junction connector

Tech Tips

The diagnosis procedure is for when DTC U1002 is output by the power management control ECU (GTS display: PM1 Gateway).

WIRING DIAGRAM

A0042EAE02
A00416NE03

INSPECTION PROCEDURE

Note


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

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

  • After the power 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 power 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 power 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 VEHICLE TYPE


    1. Check vehicle type.

      Result
      Result Proceed to
      for LHD A
      for RHD B

    B

    CHECK V2 BUS WIRE Click here

    A

  2. CHECK V2 BUS WIRE


    1. Disconnect the cable from the negative (-) auxiliary battery terminal.

    2. A00435IE08
      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 Condition Specified Condition Result
      L5-34 (CA2H) - L5-35 (CA2L) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω

      Below 54 Ω:

      Short circuit between bus lines

      70 Ω or higher:

      Open circuit in a main bus line
      L5-34 (CA2H) - L5-6 (E1) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher

      Below 200 Ω:

      CANH ground short
      L5-35 (CA2L) - L5-6 (E1) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher

      Below 200 Ω:

      CANL ground short

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

      Standard Resistance
      Tester Connection Condition Specified Condition Result
      L5-34 (CA2H) - L5-1 (AM22) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANH +B short
      L5-35 (CA2L) - L5-1 (AM22) Cable disconnected from negative (-) auxiliary 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 wires C

      • Ground short

      • +B short

      		 D

    B

    CHECK FOR OPEN IN V2 MAIN BUS WIRE (POWER MANAGEMENT CONTROL ECU MAIN WIRE) Click here

    C

    CHECK FOR SHORT IN V2 BUS WIRE (POWER MANAGEMENT CONTROL ECU) Click here

    D

    CHECK FOR SHORT IN V2 BUS WIRE (POWER MANAGEMENT CONTROL ECU) Click here

    A

  3. CHECK DTC OUTPUT


    1. Reconnect the cable to the negative (-) auxiliary battery terminal.

    2. Connect the GTS to the DLC3.

    3. Turn the power switch on (IG).

    4. Turn the GTS on.

    5. Clear the DTC.

    6. Turn the power switch off.

    7. Turn the power switch on (IG), recheck for the DTC.

      Result
      Result Proceed to

      U1002 is output from power management control ECU

      (GTS display: PM1 Gateway)

      		 A
      Other DTC is output B

    B

    GO TO CIRCUITS INDICATED BY OUTPUT DTCS

    A

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

  4. CHECK FOR OPEN IN V2 MAIN BUS WIRE (POWER MANAGEMENT CONTROL ECU MAIN WIRE)


    1. Disconnect the L5 power management control ECU connector.

    2. A00431ME02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Power Management Control ECU)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L5-34 (CA2H) - L5-35 (CA2L) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω

    NG

    CHECK FOR OPEN IN V2 MAIN BUS WIRE (CAN NO. 5 J/C) Click here

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

  5. CHECK FOR OPEN IN V2 MAIN BUS WIRE (CAN NO. 5 J/C)


    1. Reconnect the L5 power management control ECU connector.

    2. A00422OE14
      Text in Illustration
      *a

      Front view of wire harness connector

      (to CAN No. 5 Junction Connector)
      *b to Power Management Control ECU
      *c to CAN No. 3 Junction Connector

      Disconnect the wire harness connector from the CAN No. 5 junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      L117-2 (CANH) - L117-13 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω Power management control ECU
      L117-3 (CANH) - L117-14 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω CAN No. 3 junction connector
      Result
      Result Proceed to
      OK A
      NG (to Power management control ECU) B
      NG (to CAN No. 3 junction connector) C

    B

    REPAIR OR REPLACE CAN MAIN BUS WIRE OR CONNECTOR (CAN NO. 5 J/C - POWER MANAGEMENT CONTROL ECU)

    C

    CHECK FOR OPEN IN V2 MAIN BUS WIRE (CAN NO. 3 J/C) Click here

    A

    REPLACE CAN NO. 5 JUNCTION CONNECTOR

  6. CHECK FOR OPEN IN V2 MAIN BUS WIRE (CAN NO. 3 J/C)


    1. Reconnect the wire harness connector to the CAN No. 5 junction connector.

    2. A00439EE10
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to CAN No. 3 Junction Connector)
      *b to CAN No. 5 Junction Connector

      Disconnect the wire harness connector (L82) from the CAN No. 3 junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      L82-1 (CANH) - L82-2 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω CAN No. 5 junction connector

    NG

    REPAIR OR REPLACE CAN MAIN BUS WIRE OR CONNECTOR (CAN NO. 3 J/C - CAN NO. 5 J/C)

    OK

    REPLACE CAN NO. 3 JUNCTION CONNECTOR

  7. CHECK FOR SHORT IN V2 BUS WIRE (POWER MANAGEMENT CONTROL ECU)


    1. A00431ME02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Power Management Control ECU)

      Disconnect the L5 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
      L5-34 (CA2H) - L5-35 (CA2L) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω

    NG

    CHECK FOR SHORT IN V2 BUS WIRE (CAN NO. 5 J/C) Click here

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

  8. CHECK FOR SHORT IN V2 BUS WIRE (CAN NO. 5 J/C)


    1. Reconnect the L5 power management control ECU connector.

    2. A00422OE15
      Text in Illustration
      *a

      Front view of wire harness connector

      (to CAN No. 5 Junction Connector)
      *b to Transmission Control ECU Assembly
      *c to Power Management Control ECU
      *d to CAN No. 3 Junction Connector

      Disconnect the wire harness connector from the CAN No. 5 junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      L117-1 (CANH) - L117-12 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Transmission control ECU assembly
      L117-2 (CANH) - L117-13 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω Power management control ECU
      L117-3 (CANH) - L117-14 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω CAN No. 3 junction connector
      Result
      Result Proceed to
      OK A
      NG (to Power management control ECU) B
      NG (to CAN No. 3 junction connector) C
      NG (to Transmission control ECU) D

    B

    REPAIR OR REPLACE CAN MAIN BUS WIRE OR CONNECTOR (CAN NO. 5 J/C - POWER MANAGEMENT CONTROL ECU)

    C

    CHECK FOR SHORT IN V2 BUS WIRE (CAN NO. 3 J/C - CAN NO. 5 J/C) Click here

    D

    CHECK FOR SHORT IN V2 BUS WIRE (TRANSMISSION CONTROL ECU ASSEMBLY) Click here

    A

    REPLACE CAN NO. 5 JUNCTION CONNECTOR

  9. CHECK FOR SHORT IN V2 BUS WIRE (CAN NO. 3 J/C - CAN NO. 5 J/C)


    1. Reconnect the wire harness connector to the CAN No. 5 junction connector.

    2. A00439EE10
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to CAN No. 3 Junction Connector)
      *b to CAN No. 5 Junction Connector

      Disconnect the wire harness connector (L82) from the CAN No. 3 junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      L82-1 (CANH) - L82-2 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω CAN No. 5 junction connector

    NG

    REPAIR OR REPLACE CAN MAIN BUS WIRE OR CONNECTOR (CAN NO. 3 J/C - CAN NO. 5 J/C)

    OK

  10. CHECK FOR SHORT IN V2 BUS WIRE (CAN NO. 3 J/C)


    1. Reconnect the wire harness connector (L82) to the CAN No. 3 junction connector.

    2. A00435IE09
      Text in Illustration
      *a

      Component with harness connected

      (Power Management Control ECU)

      Connect the probes of an ohmmeter to terminals 34 (CA2H) and 35 (CA2L) of the power management control ECU.

    3. While observing the resistance value shown on the ohmmeter, disconnect branch wire connectors (except L82) from the CAN No. 3 junction connector until the resistance becomes normal (between 54 and 69 Ω).

      A003ZWYE01
      Text in Illustration
      *1 CAN No. 3 Junction Connector - -
      *a Junction Connector B Side *b Junction Connector A Side
      *c Earth Terminal *d

      Front view of wire harness connector

      (to CAN No. 3 Junction Connector)
      Terminal No. (Symbol) Wiring Color Connected to
      L81 W-B Body ground
      L82-1 (CANH) V CAN No. 5 junction connector
      L82-2 (CANL) W
      L83-1 (CANH) LG Seat belt control ECU*1
      L83-2 (CANL) L
      L84-1 (CANH) B Driving support ECU*2
      L84-2 (CANL) W
      L85-1 (CANH) Y Parking assist ECU*3
      L85-2 (CANL) W
      L88-1 (CANH) R Center airbag sensor assembly
      L88-2 (CANL) G
      L89-1 (CANH) Y Air conditioning amplifier assembly
      L89-2 (CANL) BR

      • *1: w/ Pre-crash safety system

      • *2: w/ Dynamic radar cruise control system

      • *3: w/ Intelligent parking assist system

      Tech Tips


      • The connectors connected to the CAN junction connector can be distinguished by the colors of the bus wire.

      • Reconnecting the connectors to non-specified positions on the CAN junction connector does not affect system operation.

        Result
        Result Proceed to

        The resistance is still below 54 Ω when all the specified connectors are disconnected.

        (There is no short in the branch wires.)

        		 A

        The resistance becomes normal (between 54 and 69 Ω) when a connector is disconnected.

        (There is a short in one or more of the branch wires.)

        		 B

    B

    CHECK FOR SHORT IN V2 BUS WIRE (ECUS) Click here

    A

    REPLACE CAN NO. 3 JUNCTION CONNECTOR

  11. CHECK FOR SHORT IN V2 BUS WIRE (ECUS)


    1. Reconnect the connector for the short-circuited branch wire to the CAN junction connector (the connector that caused the bus wire resistance to become normal (between 54 and 69 Ω) when it was disconnected).

    2. Disconnect the connector that includes terminals CANH and CANL from the ECU to which the short-circuited branch wire is connected.

    3. A00435IE09
      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 Condition Specified Condition
      L5-34 (CA2H) - L5-35 (CA2L) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω

      Tech Tips

      If the resistance becomes normal (between 54 and 69 Ω) when the connector is disconnected from the ECU, there may be a short in the ECU.


    NG

    REPAIR OR REPLACE CORRESPONDING ECU OR SENSOR BRANCH WIRE OR CONNECTOR

    OK

    REPLACE CORRESPONDING ECU OR SENSOR

  12. CHECK FOR SHORT IN V2 BUS WIRE (TRANSMISSION CONTROL ECU ASSEMBLY)


    1. Reconnect the wire harness connector to the CAN No. 5 junction connector.

    2. A00423OE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Transmission Control ECU Assembly)

      Disconnect the A23 transmission control ECU assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A23-16 (CA1H) - A23-15 (CA1L) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω

    NG

    REPAIR OR REPLACE CAN BUS WIRE OR CONNECTOR (CAN NO. 5 J/C - TRANSMISSION CONTROL ECU ASSEMBLY)

    OK

    REPLACE TRANSMISSION CONTROL ECU ASSEMBLY Click here

  13. CHECK FOR SHORT IN V2 BUS WIRE (POWER MANAGEMENT CONTROL ECU)


    1. A00431ME03
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Power Management Control ECU)

      Disconnect the L5 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
      L5-34 (CA2H) - L5-6 (E1) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANH ground short
      L5-35 (CA2L) - L5-6 (E1) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANL ground short
      L5-34 (CA2H) - L5-1 (AM22) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANH +B short
      L5-35 (CA2L) - L5-1 (AM22) Cable disconnected from negative (-) auxiliary 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 (short circuit) that was obtained in the Check V2 Bus Wire inspection.

      Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check V2 Bus Wire inspection.


    NG

    CHECK FOR SHORT IN V2 BUS WIRE (CAN NO. 5 J/C) Click here

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

  14. CHECK FOR SHORT IN V2 BUS WIRE (CAN NO. 5 J/C)


    1. Disconnect the wire harness connector from the CAN No. 5 junction connector.

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

      A0041BQE02
      Text in Illustration
      *1 DLC3 - -
      *a

      Front view of wire harness connector

      (to CAN No. 5 Junction Connector)

      		 *b to Transmission Control ECU Assembly
      *c to Power Management Control ECU *d to CAN No. 3 Junction Connector
      Standard Resistance
      Tester Connection Condition Specified Condition Purpose Connected to
      L117-1 (CANH) - L55-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANH ground short Transmission control ECU assembly
      L117-12 (CANL) - L55-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANL ground short
      L117-2 (CANH) - L55-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANH ground short Power management control ECU
      L117-13 (CANL) - L55-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANL ground short
      L117-3 (CANH) - L55-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANH ground short CAN No. 3 junction connector
      L117-14 (CANL) - L55-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANL ground short
      L117-1 (CANH) - L55-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANH +B short Transmission control ECU assembly
      L117-12 (CANL) - L55-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANL +B short
      L117-2 (CANH) - L55-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANH +B short Power management control ECU
      L117-13 (CANL) - L55-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANL +B short
      L117-3 (CANH) - L55-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANH +B short CAN No. 3 junction connector
      L117-14 (CANL) - L55-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANL +B short
      Result
      Result Proceed to
      OK A
      NG (to Power management control ECU) B
      NG (to CAN No. 3 junction connector) C
      NG (to Transmission control ECU assembly) D

      Tech Tips

      It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check V2 Bus Wire inspection.

      Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check V2 Bus Wire inspection.


    B

    REPAIR OR REPLACE CAN MAIN BUS WIRE OR CONNECTOR (CAN NO. 5 J/C - POWER MANAGEMENT CONTROL ECU)

    C

    CHECK FOR SHORT IN V2 BUS WIRE (CAN NO. 3 J/C - CAN NO. 5 J/C) Click here

    D

    CHECK FOR SHORT IN V2 BUS WIRE (TRANSMISSION CONTROL ECU ASSEMBLY) Click here

    A

    REPLACE CAN NO. 5 JUNCTION CONNECTOR

  15. CHECK FOR SHORT IN V2 BUS WIRE (CAN NO. 3 J/C - CAN NO. 5 J/C)


    1. Reconnect the wire harness connector to the CAN No. 5 junction connector.

    2. A00439EE10
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to CAN No. 3 Junction Connector)
      *b to CAN No. 5 Junction Connector

      Disconnect the wire harness connector (L82) from the CAN No. 3 junction connector.

    3. A00431ME03
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Power Management Control ECU)

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

      Standard Resistance
      Tester Connection Condition Specified Condition Purpose
      L5-34 (CA2H) - L5-6 (E1) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANH ground short
      L5-35 (CA2L) - L5-6 (E1) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANL ground short
      L5-34 (CA2H) - L5-1 (AM22) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANH +B short
      L5-35 (CA2L) - L5-1 (AM22) Cable disconnected from negative (-) auxiliary 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 (short circuit) that was obtained in the Check V2 Bus Wire inspection.

      Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check V2 Bus Wire inspection.


    NG

    REPAIR OR REPLACE CAN MAIN BUS WIRE OR CONNECTOR (CAN NO. 3 J/C - CAN NO. 5 J/C)

    OK

  16. CHECK FOR SHORT IN V2 BUS WIRE (CAN NO. 3 J/C)


    1. Reconnect the wire harness connector (L82) to the CAN No. 3 junction connector.

    2. A00431ME03
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Power Management Control ECU)

      Connect the probes of an ohmmeter to terminals CANH (CA2H) or CANL (CA2L) and GND (E1) or +B (AM22) of the power management control ECU.

      Tech Tips

      It is only necessary to perform the inspection for the result (short circuit) that was obtained in the Check V2 Bus Wire inspection.

    3. While observing the resistance value shown on the ohmmeter, disconnect each branch wire connector (except L82) from the CAN No. 3 junction connector until the resistance becomes normal (6 kΩ or higher (for +B short) or 200 Ω or higher (for ground short)).

      A003ZWYE01
      Text in Illustration
      *1 CAN No. 3 Junction Connector - -
      *a Junction Connector B Side *b Junction Connector A Side
      *c Earth Terminal *d

      Front view of wire harness connector

      (to CAN No. 3 Junction Connector)
      Terminal No. (Symbol) Wiring Color Connected to
      L81 W-B Body ground
      L82-1 (CANH) V CAN No. 5 junction connector
      L82-2 (CANL) W
      L83-1 (CANH) LG Seat belt control ECU*1
      L83-2 (CANL) L
      L84-1 (CANH) B Driving support ECU*2
      L84-2 (CANL) W
      L85-1 (CANH) Y Parking assist ECU*3
      L85-2 (CANL) W
      L88-1 (CANH) R Center airbag sensor assembly
      L88-2 (CANL) G
      L89-1 (CANH) Y Air conditioning amplifier assembly
      L89-2 (CANL) BR

      • *1: w/ Pre-crash safety system

      • *2: w/ Dynamic radar cruise control system

      • *3: w/ Intelligent parking assist system

      Tech Tips


      • The connectors connected to the CAN junction connector can be distinguished by the colors of the bus wire.

      • Reconnecting the connectors to non-specified positions on the CAN junction connector does not affect system operation.

        Result
        Result Proceed to

        The resistance between terminals CANH and +B, or the resistance between terminals CANL and +B is still below 6 kΩ when all the specified connectors are disconnected from the CAN junction connector.

        (There is no short to +B in the branch wires.)

        		 A

        The resistance between terminals CANH and GND, or the resistance between terminals CANL and GND is still below 200 Ω when all the specified connectors are disconnected from the CAN junction connector.

        (There is no short to GND in the branch wires.)

        The resistance between terminals CANH and +B, or the resistance between terminals CANL and +B becomes normal (6 kΩ or higher) when a connector is disconnected from the CAN junction connector.

        (There is a short to +B in one of the areas related to one or more of the disconnected branch wires.)

        		 B

        The resistance between terminals CANH and GND, or the resistance between terminals CANL and GND becomes normal (200 Ω or higher) when a connector is disconnected from the CAN junction connector.

        There is a short to GND in one of the areas related to one or more of the disconnected branch wires.)

    B

    CHECK FOR SHORT IN V2 BUS WIRE (ECUS) Click here

    A

    REPLACE CAN NO. 3 JUNCTION CONNECTOR

  17. CHECK FOR SHORT IN V2 BUS WIRE (ECUS)


    1. Reconnect the connector for the bus wire that is shorted to +B or GND to the CAN junction connector (the connector that caused the bus wire resistance to change to 6 kΩ or higher (for +B short) or 200 Ω or higher (for ground short) when it was disconnected).

    2. Disconnect the connector that includes terminals CANH and CANL from the ECU to which the bus wire shorted to +B or GND is connected.

    3. A00431ME03
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Power Management Control ECU)

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

      Standard Resistance
      Tester Connection Condition Specified Condition Purpose
      L5-34 (CA2H) - L5-6 (E1) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANH ground short
      L5-35 (CA2L) - L5-6 (E1) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANL ground short
      L5-34 (CA2H) - L5-1 (AM22) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANH +B short
      L5-35 (CA2L) - L5-1 (AM22) Cable disconnected from negative (-) auxiliary 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 (short circuit) that was obtained in the Check V2 Bus Wire inspection.

      Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check V2 Bus Wire inspection.


    NG

    REPAIR OR REPLACE CORRESPONDING ECU OR SENSOR BRANCH WIRE OR CONNECTOR

    OK

    REPLACE CORRESPONDING ECU OR SENSOR

  18. CHECK FOR SHORT IN V2 BUS WIRE (TRANSMISSION CONTROL ECU ASSEMBLY)


    1. Disconnect the A22 and A23 transmission control ECU assembly connectors.

    2. A0041Q7E19
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Transmission Control ECU Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition Purpose
      A23-16 (CA1H) - A23-1 (E1) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANH ground short
      A23-15 (CA1L) - A23-1 (E1) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANL ground short
      A23-16 (CA1H) - A22-15 (BATT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANH +B short
      A23-15 (CA1L) - A22-15 (BATT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANL +B short

    NG

    REPAIR OR REPLACE CAN BUS WIRE OR CONNECTOR (CAN NO. 5 J/C - TRANSMISSION CONTROL ECU ASSEMBLY)

    OK

    REPLACE TRANSMISSION CONTROL ECU ASSEMBLY Click here

  19. CHECK V2 BUS WIRE


    1. Disconnect the cable from the negative (-) auxiliary battery terminal.

    2. A00435IE08
      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 Condition Specified Condition Result
      L5-34 (CA2H) - L5-35 (CA2L) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω

      Below 54 Ω:

      Short circuit between bus lines

      70 Ω or higher:

      Open circuit in a main bus line
      L5-34 (CA2H) - L5-6 (E1) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher

      Below 200 Ω:

      CANH ground short
      L5-35 (CA2L) - L5-6 (E1) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher

      Below 200 Ω:

      CANL ground short

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

      Standard Resistance
      Tester Connection Condition Specified Condition Result
      L5-34 (CA2H) - L5-1 (AM22) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANH +B short
      L5-35 (CA2L) - L5-1 (AM22) Cable disconnected from negative (-) auxiliary 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 wires C

      • Ground short

      • +B short

      		 D

    B

    CHECK FOR OPEN IN V2 MAIN BUS WIRE (POWER MANAGEMENT CONTROL ECU MAIN WIRE) Click here

    C

    CHECK FOR SHORT IN V2 BUS WIRE (POWER MANAGEMENT CONTROL ECU) Click here

    D

    CHECK FOR SHORT IN V2 BUS WIRE (POWER MANAGEMENT CONTROL ECU) Click here

    A

  20. CHECK DTC OUTPUT


    1. Reconnect the cable to the negative (-) auxiliary battery terminal.

    2. Connect the GTS to the DLC3.

    3. Turn the power switch on (IG).

    4. Turn the GTS on.

    5. Clear the DTC.

    6. Turn the power switch off.

    7. Turn the power switch on (IG), recheck for the DTC.

      Result
      Result Proceed to

      U1002 is output from power management control ECU

      (GTS display: PM1 Gateway)

      		 A
      Other DTC is output B

    B

    GO TO CIRCUITS INDICATED BY OUTPUT DTCS

    A

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

  21. CHECK FOR OPEN IN V2 MAIN BUS WIRE (POWER MANAGEMENT CONTROL ECU MAIN WIRE)


    1. Disconnect the L5 power management control ECU connector.

    2. A00431ME02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Power Management Control ECU)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L5-34 (CA2H) - L5-35 (CA2L) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω

    NG

    CHECK FOR OPEN IN V2 MAIN BUS WIRE (CAN NO. 3 J/C) Click here

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

  22. CHECK FOR OPEN IN V2 MAIN BUS WIRE (CAN NO. 3 J/C)


    1. Reconnect the L5 power management control ECU connector.

    2. A00439EE11
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to CAN No. 3 Junction Connector)
      *b to Power Management Control ECU

      Disconnect the wire harness connector (L82) from the CAN No. 3 junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      L82-1 (CANH) - L82-2 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω Power management control ECU

    NG

    REPAIR OR REPLACE CAN MAIN BUS WIRE OR CONNECTOR (CAN NO. 3 J/C - POWER MANAGEMENT CONTROL ECU)

    OK

    REPLACE CAN NO. 3 JUNCTION CONNECTOR

  23. CHECK FOR SHORT IN V2 BUS WIRE (POWER MANAGEMENT CONTROL ECU)


    1. A00431ME02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Power Management Control ECU)

      Disconnect the L5 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
      L5-34 (CA2H) - L5-35 (CA2L) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω

    NG

    CHECK FOR SHORT IN V2 BUS WIRE (CAN NO. 3 J/C - POWER MANAGEMENT CONTROL ECU) Click here

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

  24. CHECK FOR SHORT IN V2 BUS WIRE (CAN NO. 3 J/C - POWER MANAGEMENT CONTROL ECU)


    1. Reconnect the L5 power management control ECU connector.

    2. A00439EE11
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to CAN No. 3 Junction Connector)
      *b to Power Management Control ECU

      Disconnect the wire harness connector (L82) from the CAN No. 3 junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      L82-1 (CANH) - L82-2 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω Power management control ECU

    NG

    REPAIR OR REPLACE CAN MAIN BUS WIRE OR CONNECTOR (CAN NO. 3 J/C - POWER MANAGEMENT CONTROL ECU)

    OK

  25. CHECK FOR SHORT IN V2 BUS WIRE (CAN NO. 3 J/C)


    1. Reconnect the wire harness connector (L82) to the CAN No. 3 junction connector.

    2. A00435IE09
      Text in Illustration
      *a

      Component with harness connected

      (Power Management Control ECU)

      Connect the probes of an ohmmeter to terminals 34 (CA2H) and 35 (CA2L) of the power management control ECU.

    3. While observing the resistance value shown on the ohmmeter, disconnect branch wire connectors (except L82) from the CAN No. 3 junction connector until the resistance becomes normal (between 54 and 69 Ω).

      A0041JOE04
      Text in Illustration
      *1 CAN No. 3 Junction Connector - -
      *a Junction Connector B Side *b Junction Connector A Side
      *c Earth Terminal *d

      Front view of wire harness connector

      (to CAN No. 3 Junction Connector)
      Terminal No. (Symbol) Wiring Color Connected to
      L81 W-B Body ground
      L82-1 (CANH) P Power management control ECU
      L82-2 (CANL) V
      L83-1 (CANH) LG Seat belt control ECU*1
      L83-2 (CANL) L
      L84-1 (CANH) B Driving support ECU*2
      L84-2 (CANL) W
      L85-1 (CANH) Y Parking assist ECU*3
      L85-2 (CANL) W
      L87-1 (CANH) BE Transmission control ECU assembly
      L87-2 (CANL) P
      L88-1 (CANH) R Center airbag sensor assembly
      L88-2 (CANL) G
      L89-1 (CANH) Y Air conditioning amplifier assembly
      L89-2 (CANL) BR

      • *1: w/ Pre-crash safety system

      • *2: w/ Dynamic radar cruise control system

      • *3: w/ Intelligent parking assist system

      Tech Tips


      • The connectors connected to the CAN junction connector can be distinguished by the colors of the bus wire.

      • Reconnecting the connectors to non-specified positions on the CAN junction connector does not affect system operation.

        Result
        Result Proceed to

        The resistance is still below 54 Ω when all the specified connectors are disconnected.

        (There is no short in the branch wires.)

        		 A

        The resistance becomes normal (between 54 and 69 Ω) when a connector is disconnected.

        (There is a short in one or more of the branch wires.)

        		 B

    B

    CHECK FOR SHORT IN V2 BUS WIRE (ECUS) Click here

    A

    REPLACE CAN NO. 3 JUNCTION CONNECTOR

  26. CHECK FOR SHORT IN V2 BUS WIRE (ECUS)


    1. Reconnect the connector for the short-circuited branch wire to the CAN junction connector (the connector that caused the bus wire resistance to become normal (between 54 and 69 Ω) when it was disconnected).

    2. Disconnect the connector that includes terminals CANH and CANL from the ECU to which the short-circuited branch wire is connected.

    3. A00435IE09
      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 Condition Specified Condition
      L5-34 (CA2H) - L5-35 (CA2L) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω

      Tech Tips

      If the resistance becomes normal (between 54 and 69 Ω) when the connector is disconnected from the ECU, there may be a short in the ECU.


    NG

    REPAIR OR REPLACE CORRESPONDING ECU OR SENSOR BRANCH WIRE OR CONNECTOR

    OK

    REPLACE CORRESPONDING ECU OR SENSOR

  27. CHECK FOR SHORT IN V2 BUS WIRE (POWER MANAGEMENT CONTROL ECU)


    1. A00431ME03
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Power Management Control ECU)

      Disconnect the L5 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
      L5-34 (CA2H) - L5-6 (E1) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANH ground short
      L5-35 (CA2L) - L5-6 (E1) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANL ground short
      L5-34 (CA2H) - L5-1 (AM22) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANH +B short
      L5-35 (CA2L) - L5-1 (AM22) Cable disconnected from negative (-) auxiliary 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 (short circuit) that was obtained in the Check V2 Bus Wire inspection.

      Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check V2 Bus Wire inspection.


    NG

    CHECK FOR SHORT IN V2 BUS WIRE (CAN NO. 3 J/C - POWER MANAGEMENT CONTROL ECU) Click here

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

  28. CHECK FOR SHORT IN V2 BUS WIRE (CAN NO. 3 J/C - POWER MANAGEMENT CONTROL ECU)


    1. A00439EE11
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to CAN No. 3 Junction Connector)
      *b to Power Management Control ECU

      Disconnect the wire harness connector (L82) from the CAN No. 3 junction connector.

    2. A00431ME03
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Power Management Control ECU)

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

      Standard Resistance
      Tester Connection Condition Specified Condition Purpose
      L5-34 (CA2H) - L5-6 (E1) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANH ground short
      L5-35 (CA2L) - L5-6 (E1) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANL ground short
      L5-34 (CA2H) - L5-1 (AM22) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANH +B short
      L5-35 (CA2L) - L5-1 (AM22) Cable disconnected from negative (-) auxiliary 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 (short circuit) that was obtained in the Check V2 Bus Wire inspection.

      Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check V2 Bus Wire inspection.


    NG

    REPAIR OR REPLACE CAN MAIN BUS WIRE OR CONNECTOR (CAN NO. 3 J/C - POWER MANAGEMENT CONTROL ECU)

    OK

  29. CHECK FOR SHORT IN V2 BUS WIRE (CAN NO. 3 J/C)


    1. Reconnect the L5 power management control ECU connector.

    2. Reconnect the wire harness connector (L82) to the CAN No. 3 junction connector.

    3. A00431ME03
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Power Management Control ECU)

      Connect the probes of an ohmmeter to terminals CANH (CA2H) or CANL (CA2L) and GND (E1) or +B (AM22) of the power management control ECU.

      Tech Tips

      It is only necessary to perform the inspection for the result (short circuit) that was obtained in the Check V2 Bus Wire inspection.

    4. While observing the resistance value shown on the ohmmeter, disconnect each branch wire connector (except L82) from the CAN No. 3 junction connector until the resistance becomes normal (6 kΩ or higher (for +B short) or 200 Ω or higher (for ground short)).

      A0041JOE04
      Text in Illustration
      *1 CAN No. 3 Junction Connector - -
      *a Junction Connector B Side *b Junction Connector A Side
      *c Earth Terminal *d

      Front view of wire harness connector

      (to CAN No. 3 Junction Connector)
      Terminal No. (Symbol) Wiring Color Connected to
      L81 W-B Body ground
      L82-1 (CANH) P Power management control ECU
      L82-2 (CANL) V
      L83-1 (CANH) LG Seat belt control ECU*1
      L83-2 (CANL) L
      L84-1 (CANH) B Driving support ECU*2
      L84-2 (CANL) W
      L85-1 (CANH) Y Parking assist ECU*3
      L85-2 (CANL) W
      L87-1 (CANH) BE Transmission control ECU assembly
      L87-2 (CANL) P
      L88-1 (CANH) R Center airbag sensor assembly
      L88-2 (CANL) G
      L89-1 (CANH) Y Air conditioning amplifier assembly
      L89-2 (CANL) BR

      • *1: w/ Pre-crash safety system

      • *2: w/ Dynamic radar cruise control system

      • *3: w/ Intelligent parking assist system

      Tech Tips


      • The connectors connected to the CAN junction connector can be distinguished by the colors of the bus wire.

      • Reconnecting the connectors to non-specified positions on the CAN junction connector does not affect system operation.

        Result
        Result Proceed to

        The resistance between terminals CANH and +B, or the resistance between terminals CANL and +B is still below 6 kΩ when all the specified connectors are disconnected from the CAN junction connector.

        (There is no short to +B in the branch wires.)

        		 A

        The resistance between terminals CANH and GND, or the resistance between terminals CANL and GND is still below 200 Ω when all the specified connectors are disconnected from the CAN junction connector.

        (There is no short to GND in the branch wires.)

        The resistance between terminals CANH and +B, or the resistance between terminals CANL and +B becomes normal (6 kΩ or higher) when a connector is disconnected from the CAN junction connector.

        (There is a short to +B in one of the areas related to one or more of the disconnected branch wires.)

        		 B

        The resistance between terminals CANH and GND, or the resistance between terminals CANL and GND becomes normal (200 Ω or higher) when a connector is disconnected from the CAN junction connector.

        (There is a short to GND in one of the areas related to one or more of the disconnected branch wires.)

    B

    CHECK SHORT IN CAN NO. 2 BUS WIRE (ECUS) Click here

    A

    REPLACE CAN NO. 3 JUNCTION CONNECTOR

  30. CHECK SHORT IN CAN NO. 2 BUS WIRE (ECUS)


    1. Reconnect the connector for the bus wire that is shorted to +B or GND to the CAN junction connector (the connector that caused the bus wire resistance to change to 6 kΩ or higher (for +B short) or 200 Ω or higher (for ground short) when it was disconnected).

    2. Disconnect the connector that includes terminals CANH and CANL from the ECU to which the bus wire shorted to +B or GND is connected.

    3. A00431ME03
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Power Management Control ECU)

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

      Standard Resistance
      Tester Connection Condition Specified Condition Purpose
      L5-34 (CA2H) - L5-6 (E1) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANH ground short
      L5-35 (CA2L) - L5-6 (E1) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANL ground short
      L5-34 (CA2H) - L5-1 (AM22) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANH +B short
      L5-35 (CA2L) - L5-1 (AM22) Cable disconnected from negative (-) auxiliary 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 (short circuit) that was obtained in the Check V2 Bus Wire inspection.

      Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check V2 Bus Wire inspection.


    NG

    REPAIR OR REPLACE CORRESPONDING ECU OR SENSOR BRANCH WIRE OR CONNECTOR

    OK

    REPLACE CORRESPONDING ECU OR SENSOR