CAN COMMUNICATION SYSTEM(for RHD), Diagnostic DTC:U0100, U0129, U0293

DTC Code DTC Name
U0100 Lost Communication with ECM / PCM "A"
U0129 Lost Communication with Brake System Control Module
U0293 Lost Communication with Hybrid Vehicle Control System

DESCRIPTION


DTC No. Detection Item DTC Detection Condition Trouble Area DTC Output from
U0100 Lost Communication with ECM / PCM "A" The hybrid vehicle control ECU does not receive data from the ECM.

  • Open or short in sub bus 15 main wire or connector

  • Open or short in sub bus 15 branch wire or connector

  • Power source circuit of hybrid vehicle control ECU

  • Hybrid vehicle control ECU ground circuit

  • Hybrid vehicle control ECU

  • Power source circuit of ECM

  • ECM ground circuit

  • ECM

  • Open or short in No. 1 CAN junction connector

 Hybrid vehicle control ECU
U0129 Lost Communication with Brake System Control Module The hybrid vehicle control ECU does not receive data from the brake booster with master cylinder assembly (skid control ECU).

  • Open or short in sub bus 15 main wire or connector

  • Open or short in sub bus 15 branch wire or connector

  • Power source circuit of hybrid vehicle control ECU

  • Hybrid vehicle control ECU ground circuit

  • Hybrid vehicle control ECU

  • Power source circuit of brake booster with master cylinder assembly (skid control ECU)

  • Brake booster with master cylinder assembly (skid control ECU) ground circuit

  • Brake booster with master cylinder assembly (skid control ECU)

  • Open or short in No. 1 CAN junction connector

 Hybrid vehicle control ECU
U0293 Lost Communication with Hybrid Vehicle Control System

  • The ECM does not receive data from the hybrid vehicle control ECU.

  • The brake booster with master cylinder assembly (skid control ECU) does not receive data from the hybrid vehicle control ECU.

  • Open or short in sub bus 15 main wire or connector

  • Open or short in sub bus 15 branch wire or connector

  • Power source circuit of ECM

  • ECM ground circuit

  • ECM

  • Power source circuit of hybrid vehicle control ECU

  • Hybrid vehicle control ECU ground circuit

  • Hybrid vehicle control ECU

  • Power source circuit of brake booster with master cylinder assembly (skid control ECU)

  • Brake booster with master cylinder assembly (skid control ECU) ground circuit

  • Brake booster with master cylinder assembly (skid control ECU)

  • Open or short in No. 1 CAN junction connector

  • ECM

  • Brake booster with master cylinder assembly (skid control ECU)

WIRING DIAGRAM

A0000QKE02
*a Hybrid Vehicle Control ECU
*b Brake Booster with Master Cylinder Assembly (Skid Control ECU)
*c No. 1 CAN Junction Connector

CAUTION / NOTICE / HINT

Note


  • Before measuring the resistance of the CAN bus, turn the power switch off and leave the vehicle for 1 minute or more without operating the key, switches or opening or closing the doors. After that, disconnect the cable from the negative (-) auxiliary battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.

  • After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.

    Click here

  • Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output.

    Click here

  • DTC check procedure: Drive the vehicle at a speed of 15 km/h (9 mph) or more for 3 seconds or more.

  • After the repair, perform the CAN bus check and check that all the ECUs and sensors connected to the CAN communication system are displayed.

    Click here

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 FOR DTC


    1. Check for DTCs.


      Powertrain > Hybrid Control > Trouble Codes

      Tech Tips

      If the hybrid vehicle control ECU outputs only DTC U0129, troubleshoot DTC U0129 and check the branch circuit of sub bus 15.

      Result
      Result Proceed to
      The hybrid vehicle control ECU outputs DTC U0129 and other DTCs. A
      The hybrid vehicle control ECU outputs only DTC U0129. B

    B

    GO TO DIAGNOSIS PROCEDURE INDICATED BY OUTPUT DTC Click here

    A

  2. CHECK SUB BUS 15


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

      A0001Z7C07
      *a

      Component with harness connected

      (Hybrid Vehicle Control ECU)

      		 *b Front view of DLC3

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

      Standard Resistance
      Tester Connection Condition Specified Condition Result
      I116-31 (CA3P) - I116-30 (CA3N) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω Below 53 Ω: Short in line
      I116-31 (CA3P) - I116-30 (CA3N) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω 70 Ω or higher: Open in CAN main bus line
      I116-31 (CA3P) - I7-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: Ground short
      I116-30 (CA3N) - I7-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: Ground short
      I116-31 (CA3P) - I7-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ: +B short
      I116-30 (CA3N) - I7-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ: +B short
      Result
      Result Proceed to
      OK A

      NG

      - Open in CAN main wire

      		 B

      NG

      - Short in CAN bus wire

      		 C

      NG

      - +B short

      - Ground short

      		 D

    A

    REPLACE HYBRID VEHICLE CONTROL ECU Click here

    C

    CHECK FOR SHORT IN CAN BUS WIRES (HYBRID VEHICLE CONTROL ECU) Click here

    D

    CHECK FOR SHORT IN CAN BUS WIRES (NO. 1 CAN JUNCTION CONNECTOR) Click here

    B

  3. CHECK FOR OPEN IN CAN BUS MAIN WIRE (HYBRID VEHICLE CONTROL ECU)


    1. B002JUUC47
      *a

      Front view of wire harness connector

      (to Hybrid Vehicle Control ECU)

      Disconnect the hybrid vehicle control ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I116-31 (CA3P) - I116-30 (CA3N) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE HYBRID VEHICLE CONTROL ECU Click here

    NG

  4. CONNECT CONNECTOR


    1. Reconnect the I116 hybrid vehicle control ECU connector.

      Result
      Proceed to
      NEXT

    NEXT

  5. CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 1 CAN JUNCTION CONNECTOR)


    1. A0000JCC06
      *a

      Front view of wire harness connector

      (to No. 1 CAN Junction Connector)
      *b to Hybrid Vehicle Control ECU
      *c to ECM

      Disconnect the No. 1 CAN junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      A63-2 (CANH) - A63-13 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω Hybrid Vehicle Control ECU
      A63-4 (CANH) - A63-15 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω ECM
      Result
      Result Proceed to
      OK A
      NG (to hybrid vehicle control ECU CAN main wire) B
      NG (to ECM CAN main wire) C

    A

    REPLACE NO. 1 CAN JUNCTION CONNECTOR

    B

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 1 CAN JUNCTION CONNECTOR - HYBRID VEHICLE CONTROL ECU)

    C

  6. CONNECT CONNECTOR


    1. Reconnect the A63 No. 1 CAN junction connector.

      Result
      Proceed to
      NEXT

    NEXT

  7. CHECK FOR OPEN IN CAN BUS MAIN WIRE (ECM)


    1. A00004FC06
      *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 Condition Specified Condition
      A35-12 (CANP) - A35-25 (CANN) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 1 CAN JUNCTION CONNECTOR - ECM)

  8. CHECK FOR SHORT IN CAN BUS WIRES (HYBRID VEHICLE CONTROL ECU)


    1. A00023AC48
      *a

      Front view of wire harness connector

      (to Hybrid Vehicle Control ECU)

      Disconnect the hybrid vehicle control ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I116-31 (CA3P) - I116-30 (CA3N) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE HYBRID VEHICLE CONTROL ECU Click here

    NG

  9. CONNECT CONNECTOR


    1. Reconnect the I116 hybrid vehicle control ECU connector.

      Result
      Proceed to
      NEXT

    NEXT

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


    1. A0000OTC13
      *a

      Front view of wire harness connector

      (to No. 1 CAN Junction Connector)
      *b to Brake Booster with Master Cylinder Assembly (Skid Control ECU)
      *c to Hybrid Vehicle Control ECU
      *d to ECM

      Disconnect the No. 1 CAN junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      A63-1 (CANH) - A63-12 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω Brake Booster with Master Cylinder Assembly (Skid Control ECU)
      A63-2 (CANH) - A63-13 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Hybrid Vehicle Control ECU
      A63-4 (CANH) - A63-15 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω ECM
      Result
      Result Proceed to
      OK A
      NG (to hybrid vehicle control ECU CAN main wire) B
      NG (to ECM CAN main wire) C
      NG (to brake booster with master cylinder assembly [skid control ECU] CAN branch wire) D

    A

    REPLACE NO. 1 CAN JUNCTION CONNECTOR

    B

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 1 CAN JUNCTION CONNECTOR - HYBRID VEHICLE CONTROL ECU)

    D

    CONNECT CONNECTOR Click here

    C

  11. CONNECT CONNECTOR


    1. Reconnect the A63 No. 1 CAN junction connector.

      Result
      Proceed to
      NEXT

    NEXT

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


    1. A00004FC07
      *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 Condition Specified Condition
      A35-12 (CANP) - A35-25 (CANN) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 1 CAN JUNCTION CONNECTOR - ECM)

  13. CONNECT CONNECTOR


    1. Reconnect the A63 No. 1 CAN junction connector.

      Result
      Proceed to
      NEXT

    NEXT

  14. CHECK FOR SHORT IN CAN BUS WIRES (SKID CONTROL ECU)


    1. A000061C12
      *a

      Front view of wire harness connector

      (to Brake Booster with Master Cylinder Assembly [Skid Control ECU])

      Disconnect the brake booster with master cylinder assembly (skid control ECU) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A57-35 (CA2H) - A57-34 (CA2L) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (NO. 1 CAN JUNCTION CONNECTOR - SKID CONTROL ECU)

  15. CHECK FOR SHORT IN CAN BUS WIRES (NO. 1 CAN JUNCTION CONNECTOR)


    1. Disconnect the No. 1 CAN junction connector.

      A0001NXC05
      *a

      Rear view of wire harness connector

      (to No. 1 CAN Junction Connector)

      		 *b Front view of DLC3
      *c to Brake Booster with Master Cylinder Assembly (Skid Control ECU) *d to Hybrid Vehicle Control ECU
      *e to ECM - -

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

      Standard Resistance
      Tester Connection Condition Specified Condition Purpose Connected to
      A63-1 (CANH) - I7-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANH ground short Brake Booster with Master Cylinder Assembly (Skid Control ECU)
      A63-12 (CANL) - I7-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANL ground short
      A63-1 (CANH) - I7-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANH +B short
      A63-12 (CANL) - I7-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANL +B short
      A63-2 (CANH) - I7-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANH ground short Hybrid Vehicle Control ECU
      A63-13 (CANL) - I7-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANL ground short
      A63-2 (CANH) - I7-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANH +B short
      A63-13 (CANL) - I7-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANL +B short
      A63-4 (CANH) - I7-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANH ground short ECM
      A63-15 (CANL) - I7-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANL ground short
      A63-4 (CANH) - I7-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANH +B short
      A63-15 (CANL) - I7-16 (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 hybrid vehicle control ECU CAN main wire) B
      NG (to ECM CAN main wire) C
      NG (to brake booster with master cylinder assembly [skid control ECU] CAN branch wire) D

    A

    REPLACE NO. 1 CAN JUNCTION CONNECTOR

    C

    CONNECT CONNECTOR Click here

    D

    CONNECT CONNECTOR Click here

    B

  16. CONNECT CONNECTOR


    1. Reconnect the A63 No. 1 CAN junction connector.

      Result
      Proceed to
      NEXT

    NEXT

  17. CHECK FOR SHORT IN CAN BUS WIRES (HYBRID VEHICLE CONTROL ECU)


    1. A0000W5C07
      *a

      Front view of wire harness connector

      (to Hybrid Vehicle Control ECU)
      *b Front view of DLC3

      Disconnect the hybrid vehicle control ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I116-31 (CA3P) - I7-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher
      I116-30 (CA3N) - I7-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal
      I116-31 (CA3P) - I7-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher
      I116-30 (CA3N) - I7-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE HYBRID VEHICLE CONTROL ECU Click here

    NG

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (HYBRID VEHICLE CONTROL ECU - NO. 1 CAN JUNCTION CONNECTOR)

  18. CONNECT CONNECTOR


    1. Reconnect the A63 No. 1 CAN junction connector.

      Result
      Proceed to
      NEXT

    NEXT

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


    1. A0001O7C04
      *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 Condition Specified Condition
      A35-12 (CANP) - I7-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher
      A35-25 (CANN) - I7-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal
      A35-12 (CANP) - I7-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher
      A35-25 (CANN) - I7-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (ECM - NO. 1 CAN JUNCTION CONNECTOR)

  20. CONNECT CONNECTOR


    1. Reconnect the A63 No. 1 CAN junction connector.

      Result
      Proceed to
      NEXT

    NEXT

  21. CHECK FOR SHORT IN CAN BUS WIRES (SKID CONTROL ECU)


    1. A0001DTC02
      *a

      Front view of wire harness connector

      (to Brake Booster with Master Cylinder Assembly [Skid Control ECU])
      *b Front view of DLC3

      Disconnect the brake booster with master cylinder assembly (skid control ECU) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A57-35 (CA2H) - I7-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher
      A57-34 (CA2L) - I7-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal
      A57-35 (CA2H) - I7-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher
      A57-34 (CA2L) - I7-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (SKID CONTROL ECU - NO. 1 CAN JUNCTION CONNECTOR)