HYBRID BATTERY SYSTEM, Diagnostic DTC:U029A-123

DTC Code DTC Name
U029A-123 Lost Communication with Hybrid Battery Pack Sensor Module

DESCRIPTION

The battery voltage sensor detects the HV battery conditions (voltage, current, and temperature) and the battery cooling fan frequency, and sends the detected signals to the power management control ECU via serial communication. (The power management control ECU does not send signals to the battery voltage sensor.)

DTC No. DTC Detection Condition Trouble Area
U029A-123 Serial communication error between the power management control ECU and battery voltage sensor: The power management control ECU cannot receive signals from the battery voltage sensor correctly. (1 trip detection logic)
  • Harness or connector

  • Power management control ECU

  • Battery voltage sensor

WIRING DIAGRAM

A01FV38E02

INSPECTION PROCEDURE

CAUTION:


  • Before inspecting the high-voltage system, take safety precautions to prevent electrical shocks, such as wearing insulated gloves and removing the service plug grip. After removing the service plug grip, put it in your pocket to prevent other technicians from accidentally reconnecting it while you are working on the high-voltage system.

  • After removing the service plug grip, wait for at least 10 minutes before touching any of the high-voltage connectors or terminals. After waiting for 10 minutes, check the voltage at the terminals in the inspection point in the inverter with converter assembly. The voltage should be 0 V before beginning work Click here.

    Tech Tips

    At least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.

Note

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.

Tech Tips

After the repair, clear the DTCs and perform the following procedure to check that DTCs are not output.


  1. Turn the power switch on (IG) and wait for 2 minutes or more.

PROCEDURE


  1. CHECK DTC OUTPUT (HYBRID CONTROL)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

    4. Read output DTCs.

      Result
      Result Proceed to
      Only U029A-123 is output. A
      DTCs except U029A-123 are also output. B
    5. Turn the power switch off.


    B
    A
  2. CHECK HARNESS AND CONNECTOR (IGCT VOLTAGE)

    CAUTION:

    Be sure to wear insulated gloves.


    1. Check that the service plug grip is not installed.

      Note

      After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.

    2. Remove the front luggage compartment trim cover Click here.

    3. Connect the cable to the negative (-) auxiliary battery terminal.

    4. Turn the power switch on (IG).

    5. A01FVD3E01
      Text in Illustration
      *a

      Component with harness connected

      (No. 2 Hybrid Battery Pack Wire Connector)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      mT1-10 (IGCT) - mT1-11 (GND) Power switch on (IG) 11 to 14 V

      Note

      Turning the power switch on (IG) with the service grip removed causes other DTCs to be stored. Clear the DTCs after performing this inspection.

    6. Turn the power switch off.

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

    8. Install the front luggage compartment trim cover.


    NG
    OK
  3. CHECK HARNESS AND CONNECTOR (IGCT VOLTAGE)

    CAUTION:

    Be sure to wear insulated gloves.


    1. Check that the service plug grip is not installed.

      Note

      After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.

    2. Remove the upper hybrid battery cover sub-assembly Click here.

    3. Connect the cable to the negative (-) auxiliary battery terminal.

    4. Turn the power switch on (IG).

    5. A01FTA8E01
      Text in Illustration
      *a

      Component with harness connected

      (Battery Voltage Sensor)

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

      Standard Voltage:
      Tester Connection Switch Condition Specified Condition
      m5-3 (IGCT) - m5-6 (GND) Power switch on (IG) 11 to 14 V

      Note

      Turning the power switch on (IG) with the service grip removed causes other DTCs to be stored. Clear the DTCs after performing this inspection.

    6. Turn the power switch off.

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

    8. Install the upper hybrid battery cover sub-assembly.


    NG
    OK
  4. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - NO. 2 HYBRID BATTERY PACK WIRE CONNECTOR)

    CAUTION:

    Be sure to wear insulated gloves.


    1. Check that the service plug grip is not installed.

      Note

      After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.

    2. Disconnect N91 connector from the power management control ECU.

      Note


      • Before disconnecting the connector, push in on the connector body to check that the connector is not loose or disconnected.

      • Push in on each connector between the power management control ECU and the No. 2 hybrid battery pack wire connector to check that each connector is not loose or disconnected.

    3. Remove the front luggage compartment trim cover Click here.

    4. Disconnect mT1 connector from the No. 2 hybrid battery pack wire connector.

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

      A01FTFCE01
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Power Management Control ECU)

      *b

      Rear view of wire harness connector

      (to No. 2 Hybrid Battery Pack Wire Connector)

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      N91-30 (BTH+) - mT1-8 (BTH+) Power switch off Below 1 Ω
      N91-29 (BTH-) - mT1-7 (BTH-) Power switch off Below 1 Ω
      mT1-8 (BTH+) - mT1-11 (GND) and Body ground Power switch off 10 kΩ or higher
      mT1-7 (BTH-) - mT1-11 (GND) and Body ground Power switch off 10 kΩ or higher
    6. A01FUV9E04
      Text in Illustration
      *1 No. 1 Engine Room Relay Block and Junction Block Assembly
      *2 IGCT NO.5 fuse

      Remove the IGCT NO.5 fuse from the No. 1 engine room relay block and junction block assembly.

    7. for LHD:


      1. A01FUORE01
        Text in Illustration
        *1 Cowl Side Junction Block LH
        *2 LH-IG2 fuse

        Remove the LH-IG2 fuse from the cowl side junction block LH.

      2. A01FQNLE01
        Text in Illustration
        *1 Cowl Side Junction Block RH
        *2 AM2 fuse

        Remove the AM2 fuse from the cowl side junction block RH.

    8. for RHD:


      1. A01FRGIE01
        Text in Illustration
        *1 Cowl Side Junction Block LH
        *2 LH-IG2 fuse
        *3 AM2 fuse

        Remove the LH-IG2 fuse and AM2 fuse from the cowl side junction block LH.

    9. Disconnect all connectors from the power management control ECU.

    10. A01FTWRE06
      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 Switch Condition Specified Condition
      N91-30 (BTH+) - N92-7 (AM21) Power switch off 10 kΩ or higher
      N91-30 (BTH+) - N91-1 (AM22) Power switch off 10 kΩ or higher
      N91-30 (BTH+) - A35-1 (+B2) Power switch off 10 kΩ or higher
      N91-30 (BTH+) - A36-3 (+B1) Power switch off 10 kΩ or higher
      N91-30 (BTH+) - A35-4 (MREL) Power switch off 10 kΩ or higher
      N91-30 (BTH+) - A35-10 (ACCI) Power switch off 10 kΩ or higher
      N91-30 (BTH+) - A36-1 (IG2) Power switch off 10 kΩ or higher
      N91-30 (BTH+) - N92-1 (ACCD) Power switch off 10 kΩ or higher
      N91-30 (BTH+) - N92-2 (IG1D) Power switch off 10 kΩ or higher
      N91-30 (BTH+) - A36-2 (IG2D) Power switch off 10 kΩ or higher
      N91-30 (BTH+) - N91-16 (SPDI) Power switch off 10 kΩ or higher
      N91-29 (BTH-) - N92-7 (AM21) Power switch off 10 kΩ or higher
      N91-29 (BTH-) - N91-1 (AM22) Power switch off 10 kΩ or higher
      N91-29 (BTH-) - A35-1 (+B2) Power switch off 10 kΩ or higher
      N91-29 (BTH-) - A36-3 (+B1) Power switch off 10 kΩ or higher
      N91-29 (BTH-) - A35-4 (MREL) Power switch off 10 kΩ or higher
      N91-29 (BTH-) - A35-10 (ACCI) Power switch off 10 kΩ or higher
      N91-29 (BTH-) - A36-1 (IG2) Power switch off 10 kΩ or higher
      N91-29 (BTH-) - N92-1 (ACCD) Power switch off 10 kΩ or higher
      N91-29 (BTH-) - N92-2 (IG1D) Power switch off 10 kΩ or higher
      N91-29 (BTH-) - A36-2 (IG2D) Power switch off 10 kΩ or higher
      N91-29 (BTH-) - N91-16 (SPDI) Power switch off 10 kΩ or higher

      Note

      When taking a measurement with a tester, do not apply excessive force to the tester probe to avoid damaging the holder.

    11. for LHD:


      1. Install the AM2 fuse to the cowl side junction block RH.

      2. Install the LH-IG2 fuse to the cowl side junction block LH.

    12. for RHD:


      1. Install the LH-IG2 fuse and AM2 fuse to the cowl side junction block LH.

    13. Install the IGCT NO.5 fuse to the No. 1 engine room relay block and junction block assembly.

    14. Connect the power management control ECU connectors.

    15. Connect the No. 2 hybrid battery pack wire connector.

    16. Install the front luggage compartment trim cover.


    NG
    OK
  5. CHECK HARNESS AND CONNECTOR (BATTERY VOLTAGE SENSOR - NO. 2 HYBRID BATTERY PACK WIRE CONNECTOR)

    CAUTION:

    Be sure to wear insulated gloves.


    1. Check that the service plug grip is not installed.

      Note

      After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.

    2. Remove the upper hybrid battery cover sub-assembly Click here.

    3. Disconnect the m5 battery voltage sensor connector.

    4. Disconnect the mT1 No. 2 hybrid battery pack wire connector.

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

      A01FT8VE01
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Battery Voltage Sensor)

      *b

      Rear view of wire harness connector

      (to No. 2 Hybrid Battery Pack Wire Connector)

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      m5-1 (BTH+) - mT1-8 (BTH+) Power switch off Below 1 Ω
      m5-4 (BTH-) - mT1-7 (BTH-) Power switch off Below 1 Ω
      mT1-8 (BTH+) - mT1-11 (GND) and Body ground Power switch off 10 kΩ or higher
      mT1-7 (BTH-) - mT1-11 (GND) and Body ground Power switch off 10 kΩ or higher

      Note

      When taking a measurement with a tester, do not apply excessive force to the tester probe to avoid damaging the holder.

    6. Connect the mT1 No. 2 hybrid battery pack wire connector.

    7. Connect the m5 battery voltage sensor.

    8. Install the upper hybrid battery cover sub-assembly.


    NG
    OK
  6. CHECK POWER MANAGEMENT CONTROL ECU

    CAUTION:

    Be sure to wear insulated gloves.


    1. Check that the service plug grip is not installed.

      Note

      After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.

    2. Remove the upper hybrid battery cover sub-assembly Click here.

    3. Disconnect the m5 battery voltage sensor connector.

    4. Connect the cable to the negative (-) auxiliary battery terminal.

    5. Turn the power switch on (IG).

    6. A01FUS7E01
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Battery Voltage Sensor)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      m5-1 (BTH+) - m5-6 (GND) Power switch on (IG) 2.3 to 2.7 V
      m5-4 (BTH-) - m5-6 (GND) Power switch on (IG) 2.3 to 2.7 V

      Note

      If the power switch is turned on (IG) with the connectors disconnected, other DTCs will be stored. Be sure to clear the DTCs after the inspection.

    7. Turn the power switch off.

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

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      m5-1 (BTH+) - m5-4 (BTH-) Power switch off 4.4 to 5.4 kΩ

      Tech Tips

      Resistance becomes 2.0 kΩ or less when there is a short circuit in the power management control ECU.

    10. Reconnect the m5 battery voltage sensor connector.

    11. Install the upper hybrid battery cover sub-assembly.


    NG
    OK