AIR CONDITIONING SYSTEM, Diagnostic DTC:B1471/71

DTC Code DTC Name
B1471/71 A/C Inverter High Voltage Power Resource System Malfunction

DESCRIPTION

The hybrid vehicle control ECU assembly monitors the voltage of the HV battery. The hybrid vehicle control ECU assembly stops compressor control and stores this DTC when the monitored voltage is outside the specified range.

This DTC will be stored as a history DTC. Compressor control may not resume unless the power switch is turned off.

DTC No. Detection Item DTC Detection Condition Trouble Area Memory
B1471/71 A/C Inverter High Voltage Power Resource System Malfunction

  • Open or short in A/C inverter high voltage power resource system

  • Boost inverter is broken or malfunctioning

  • Electric vehicle fuse

  • No. 4 engine wire (harness or connector between compressor with motor assembly and inverter with converter assembly)

  • Compressor with motor assembly

  • Hybrid control system

  • CAN communication system

 Memorized

WIRING DIAGRAM

A0020T7E01

CAUTION / NOTICE / HINT

CAUTION:


  • Wear insulated gloves and pull out the service plug grip before inspection as procedures may require disconnecting high-voltage connectors. Carry the removed service plug in your pocket to prevent other technicians from accidentally reconnecting it while you are servicing the vehicle.

  • Do not touch the high-voltage connectors or terminals for 10 minutes after the service plug grip is removed.

Note


  • Inspect the fuses for circuits related to this system before performing the following procedure.

  • 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

  • The hybrid control system and air conditioning system output DTCs separately. Perform troubleshooting for the hybrid control system first if DTCs from these systems are output simultaneously.

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Using the GTS, check if the CAN communication system is functioning normally.

      Click here

      Result
      Result Proceed to
      CAN communication system DTCs are not output A
      CAN communication system DTCs are output B

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  2. CHECK FOR DTC (HYBRID CONTROL SYSTEM)


    1. Check if hybrid control system DTCs are output.

      Click here


      Powertrain > Hybrid Control > Trouble Codes
      OK
      Hybrid control system DTCs are not output.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO HYBRID CONTROL SYSTEM Click here

    OK

  3. INSPECT ELECTRIC VEHICLE FUSE

    CAUTION:

    Be sure to wear insulated gloves.


    1. Turn the power switch off.

    2. Remove the service plug grip.

      Click here

      CAUTION:

      Do not touch the high-voltage connectors or terminals for 10 minutes after the service plug grip is removed.

      Note

      After removing the service plug grip, turning the power switch on (READY) may cause a malfunction. Do not turn the power switch on (READY) with the service plug grip removed.

    3. Remove the connector cover assembly.

      Click here

      Note

      Be sure to prevent foreign matter or water from entering the inverter with converter assembly.

    4. A0021U1C02
      *a Electric Vehicle Fuse

      Check that bolts A and B are tightened securely.

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

      Standard Resistance

      Tester Item

      (Tester Connection)

      		 Condition Specified Condition

      Electric vehicle fuse

      (A - B)

      		 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE ELECTRIC VEHICLE FUSE Click here

    OK

  4. INSPECT NO. 4 ENGINE WIRE

    CAUTION:

    Be sure to wear insulated gloves.


    1. Disconnect the V1 and V2 No. 4 engine wire connectors. (for RHD)

      Click here

    2. Disconnect the R3 and R1 No. 4 engine wire connectors. (for LHD)

      Click here

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

      Standard Resistance
      for RHD
      Tester Connection Condition Specified Condition
      V2-1 (PE) - V1-1 (ACPE) Always Below 1 Ω
      V2-2 (PB) - V1-2 (ACPB) Always Below 1 Ω
      V2-1 (PE) - Body ground Always 10 kΩ or higher
      V2-2 (PB) - Body ground Always 10 kΩ or higher
      for LHD
      Tester Connection Condition Specified Condition
      R1-1 (PE) - R3-1 (ACPE) Always Below 1 Ω
      R1-2 (PB) - R3-2 (ACPB) Always Below 1 Ω
      R1-1 (PE) - Body ground Always 10 kΩ or higher
      R1-2 (PB) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE COMPRESSOR WITH MOTOR ASSEMBLY Click here

    NG

    REPLACE NO. 4 ENGINE WIRE Click here