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CAN COMMUNICATION SYSTEM(w/o Central Gateway ECU), Diagnostic DTC:U0100, U0129, U0293

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DTC Code DTC Name
U0100 Lost Communication with ECM / PCM "A"
U0129 Lost Communication with Brake System Control Module
U0293 Lost Communication with HV ECU
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DESCRIPTION


DTC No. DTC Detection Condition Trouble Area
U0100 The power management control ECU does not receive data from the ECM.

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

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

  • Power source circuit of power management control ECU

  • Power management control ECU

  • Power source circuit of ECM

  • ECM

  • Open or short in CAN No. 1 junction connector
U0129 The power management 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 line or connector

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

  • Power source circuit of power management control ECU

  • Power management control ECU

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

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

  • Open or short in CAN No. 1 junction connector
U0293

  • The ECM does not receive data from the power management control ECU.

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

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

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

  • Power source circuit of ECM

  • ECM

  • Power source circuit of power management control ECU

  • Power management control ECU

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

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

  • Open or short in CAN No. 1 junction connector
Tip:

This diagnosis procedure is for when DTC U0100, U0129 and U0293 are output at the same time.

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WIRING DIAGRAM

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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).

  • After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.

  • After the repair, perform CAN Bus Check and check that all the ECUs and sensors connected to the CAN communication system are displayed (Click here).

Tip:

  • 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.

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PROCEDURE


  1. Click here

    RECONFIRM DTC OUTPUT


    1. Reconfirm DTCs.

      Tip:

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

      Result
      Result Proceed to

      The power management control ECU outputs DTC U0129 and other DTCs.

      (GTS display: Hybrid Control)

      		 A

      The power management control ECU outputs only DTC U0129.

      (GTS display: Hybrid Control)

      		 B

  2. Click here

    CHECK SUB BUS 15


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

    2. A0009L6E02

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

      Standard Resistance
      Tester Connection Condition Specified Condition Result
      H2-31 (CA3P) - H2-30 (CA3N) 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
      H2-31 (CA3P) - H2-4 (E12) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: CANH ground short
      H2-30 (CA3N) - H2-4 (E12) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: CANL ground short
      H2-31 (CA3P) - H2-7 (AM21) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short
      H2-30 (CA3N) - H2-7 (AM21) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short
      Table 1. Text in Illustration
      *a

      Component with harness connected

      (Power Management Control ECU)
      Tip:

      • When the values are as specified, clear and recheck for DTCs. When no DTCs are output, check for malfunctions such as damage or improper connection of the relevant connectors.

      • If DTCs are output although the bus circuit is normal and DTCs were cleared, replace the power management control ECU.

      Result
      Result Proceed to
      OK A
      NG (Open circuit in CAN main bus line) B
      NG (Short circuit between bus lines) C

      • NG (Ground short)

      • NG (+B short)

      		 D

  3. Click here

    CHECK FOR OPEN IN SUB BUS 15 MAIN LINES (POWER MANAGEMENT CONTROL ECU)


    1. A0004UWE04

      Disconnect the H2 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
      H2-31 (CA3P) - H2-30 (CA3N) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      Table 2. Text in Illustration
      *a

      Rear view of wire harness connector

      (to Power Management Control ECU)

  4. Click here

    CHECK FOR OPEN IN SUB BUS 15 MAIN LINES (CAN NO. 1 J/C)


    1. Reconnect the H2 power management control ECU connector.

    2. A0004YNE03

      Disconnect the A62 CAN No. 1 junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      A62-2 (CANH) - A62-5 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω ECM
      A62-3 (CANH) - A62-6 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω Power management control ECU
      Table 3. Text in Illustration
      *a

      Front view of wire harness connector

      (to CAN No. 1 Junction Connector)
      *b to ECM
      *c to Power Management Control ECU
      Result
      Result Proceed to
      OK A
      NG (Open circuit in power management control ECU CAN main bus line) B
      NG (Open circuit in ECM CAN main bus line) C

    • A

      REPLACE CAN NO. 1 JUNCTION CONNECTOR

    • B

      REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (POWER MANAGEMENT CONTROL ECU - CAN NO. 1 J/C)

    • CClick here
  5. Click here

    CHECK FOR OPEN IN SUB BUS 15 MAIN LINES (ECM - CAN NO. 1 J/C)


    1. Reconnect the A62 CAN No. 1 junction connector.

    2. A0005LKE03

      Disconnect the A22 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A22-12 (CANP) - A22-25 (CANN) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      Table 4. Text in Illustration
      *a

      Front view of wire harness connector

      (to ECM)

    • OK

      REPLACE ECM (Click here)

    • NG

      REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (ECM - CAN NO. 1 J/C)

  6. Click here

    CHECK FOR SHORT IN SUB BUS 15 LINES (POWER MANAGEMENT CONTROL ECU)


    1. A0004UWE04

      Disconnect the H2 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
      H2-31 (CA3P) - H2-30 (CA3N) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      Table 5. Text in Illustration
      *a

      Rear view of wire harness connector

      (to Power Management Control ECU)

  7. Click here

    CHECK FOR SHORT IN SUB BUS 15 LINES (CAN NO. 1 J/C)


    1. Reconnect the H2 power management control ECU connector.

    2. A0006BKE03

      Disconnect the A62 CAN No. 1 junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      A62-1 (CANH) - A62-4 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Brake booster with master cylinder assembly (skid control ECU)
      A62-2 (CANH) - A62-5 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω ECM
      A62-3 (CANH) - A62-6 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω Power management control ECU
      Table 6. Text in Illustration
      *a

      Front view of wire harness connector

      (to CAN No. 1 Junction Connector)
      *b to Brake Booster with Master Cylinder Assembly (Skid Control ECU)
      *c to ECM
      *d to Power Management Control ECU
      Result
      Result Proceed to
      OK A
      NG (Short circuit between bus lines in power management control ECU CAN main bus line) B
      NG (Short circuit between bus lines in ECM CAN main bus line) C
      NG (Short circuit between bus lines in brake booster with master cylinder assembly (skid control ECU) CAN branch line) D

    • A

      REPLACE CAN NO. 1 JUNCTION CONNECTOR

    • B

      REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (POWER MANAGEMENT CONTROL ECU - CAN NO. 1 J/C)

    • CClick here
    • DClick here
  8. Click here

    CHECK FOR SHORT IN SUB BUS 15 LINES (ECM - CAN NO. 1 J/C)


    1. Reconnect the A62 CAN No. 1 junction connector.

    2. A0005LKE03

      Disconnect the A22 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A22-12 (CANP) - A22-25 (CANN) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      Table 7. Text in Illustration
      *a

      Front view of wire harness connector

      (to ECM)

    • OK

      REPLACE ECM (Click here)

    • NG

      REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (ECM - CAN NO. 1 J/C)

  9. Click here

    CHECK FOR SHORT IN SUB BUS 15 LINES (BRAKE BOOSTER WITH MASTER CYLINDER - CAN NO. 1 J/C)


    1. Reconnect the A62 CAN No. 1 junction connector.

    2. A0008FLE01

      Disconnect the A24 brake booster with master cylinder assembly (skid control ECU) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A24-35 (CA2H) - A24-34 (CA2L) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω
      Table 8. Text in Illustration
      *a

      Front view of wire harness connector

      (to Brake Booster with Master Cylinder Assembly (Skid Control ECU))
      Result
      Result Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG C

    • A

      REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY (Click here)

    • B

      REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY (Click here)

    • C

      REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY)

  10. Click here

    CHECK FOR SHORT IN SUB BUS 15 LINES (CAN NO. 1 J/C)


    1. Disconnect the A62 CAN No. 1 junction connector.

    2. A0003S3E03

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

      Standard Resistance
      Tester Connection Condition Specified Condition Purpose Connected to
      A62-1 (CANH) - H29-4 (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)
      A62-4 (CANL) - H29-4 (CG)
      A62-2 (CANH) - H29-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANH ground short ECM
      A62-5 (CANL) - H29-4 (CG)
      A62-3 (CANH) - H29-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANH ground short Power management control ECU
      A62-6 (CANL) - H29-4 (CG)
      A62-1 (CANH) - H29-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANH +B short Brake booster with master cylinder assembly (skid control ECU)
      A62-4 (CANL) - H29-16 (BAT)
      A62-2 (CANH) - H29-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANH +B short ECM
      A62-5 (CANL) - H29-16 (BAT)
      A62-3 (CANH) - H29-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANH +B short Power management control ECU
      A62-6 (CANL) - H29-16 (BAT)
      Table 9. Text in Illustration
      *1 DLC3 - -
      *a

      Front view of wire harness connector

      (to CAN No. 1 Junction Connector)

      		 *b to Brake Booster with Master Cylinder Assembly (Skid Control ECU)
      *c to ECM *d to Power Management Control ECU
      Tip:

      • It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 15 inspection.

      • Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check Sub Bus 15 inspection.

      Result
      Result Proceed to
      OK A

      • NG (Ground short in power management control ECU CAN main bus line)

      • NG (+B short in power management control ECU CAN main bus line)

      		 B

      • NG (Ground short in ECM CAN main bus line)

      • NG (+B short in ECM CAN main bus line)

      		 C

      • NG (Ground short in brake booster with master cylinder assembly (skid control ECU) CAN branch line)

      • NG (+B short in brake booster with master cylinder assembly (skid control ECU) CAN branch line)

      		 D

  11. Click here

    CHECK FOR SHORT IN SUB BUS 15 LINES (POWER MANAGEMENT CONTROL ECU - CAN NO. 1 J/C)


    1. A0004C2E02

      Disconnect the H2 power management control ECU connector.

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

      Standard Resistance
      Tester Connection Condition Purpose Specified Condition
      H2-31 (CA3P) - H2-4 (E12) Cable disconnected from negative (-) auxiliary battery terminal Inspection for CANH ground short 200 Ω or higher
      H2-30 (CA3N) - H2-4 (E12)
      H2-31 (CA3P) - H2-7 (AM21) Cable disconnected from negative (-) auxiliary battery terminal Inspection for CANH +B short 6 kΩ or higher
      H2-30 (CA3N) - H2-7 (AM21)
      Tip:

      • It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 15 inspection.

      • Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check Sub Bus 15 inspection.

      Table 10. Text in Illustration
      *a

      Rear view of wire harness connector

      (to Power Management Control ECU)

    • OK

      REPLACE POWER MANAGEMENT CONTROL ECU (Click here)

    • NG

      REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (POWER MANAGEMENT CONTROL ECU - CAN NO. 1 J/C)

  12. Click here

    CHECK FOR SHORT IN SUB BUS 15 LINES (ECM - CAN NO. 1 J/C)


    1. A00062LE02

      Disconnect the A22 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Purpose Specified Condition
      A22-12 (CANP) - D24-16 (E1) Cable disconnected from negative (-) auxiliary battery terminal Inspection for CANH ground short 200 Ω or higher
      A22-25 (CANN) - D24-16 (E1)
      A22-12 (CANP) - A22-1 (BATT) Cable disconnected from negative (-) auxiliary battery terminal Inspection for CANH +B short 6 kΩ or higher
      A22-25 (CANN) - A22-1 (BATT)
      Tip:

      • It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 15 inspection.

      • Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check Sub Bus 15 inspection.

      Table 11. Text in Illustration
      *a

      Front view of wire harness connector

      (to ECM)

    • OK

      REPLACE ECM (Click here)

    • NG

      REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (ECM - CAN NO. 1 J/C)

  13. Click here

    CHECK FOR SHORT IN SUB BUS 15 LINES (BRAKE BOOSTER WITH MASTER CYLINDER - CAN NO. 1 J/C)


    1. A0007FDE03

      Disconnect the A24 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 Purpose Specified Condition
      A24-35 (CA2H) - A24-28 (GND) Cable disconnected from negative (-) auxiliary battery terminal Inspection for CANH ground short 200 Ω or higher
      A24-34 (CA2L) - A24-28 (GND)
      A24-35 (CA2H) - A24-15 (BS) Cable disconnected from negative (-) auxiliary battery terminal Inspection for CANH +B short 6 kΩ or higher
      A24-34 (CA2L) - A24-15 (BS)
      Tip:

      • It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 15 inspection.

      • Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check Sub Bus 15 inspection.

      Table 12. Text in Illustration
      *a

      Front view of wire harness connector

      (to Brake Booster with Master Cylinder Assembly (Skid Control ECU))
      Result
      Result Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG C

    • A

      REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY (Click here)

    • B

      REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY (Click here)

    • C

      REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY)