AIR CONDITIONING SYSTEM, Diagnostic DTC:B1471/71

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

DESCRIPTION

The compressor with motor assembly monitors the voltage of the HV battery. It stops compressor control and stores the DTC when the monitored voltage is outside the specified range.

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

DTC Code DTC Detection Condition Trouble Area
B1471/71

  • Open or short in compressor with motor assembly high voltage power resource system.

  • The boost inverter is broken or malfunctioning.

  • CAN communication system

  • Hybrid control system

  • High voltage fuse

  • Air conditioning harness

  • Compressor with motor assembly

WIRING DIAGRAM

A01FVMQE02

INSPECTION PROCEDURE

CAUTION:


  • When performing this DTC troubleshooting, use either a tool wrapped with vinyl insulation tape or a insulated tool. (It is extremely dangerous when a high voltage charge passes through a non-insulated tool causing a short.)

  • Before inspecting the high voltage system or disconnecting the low voltage connector of the inverter with converter assembly, take safety precautions such as wearing insulated gloves and removing the service plug grip to prevent electrical shocks. 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 Click here.

  • 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

    Waiting for 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.

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

  • The hybrid control system and air conditioning system output DTCs separately. Inspect DTCs following the diagnosis procedure for the hybrid control system first if any DTCs from those systems are output simultaneously Click here.

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Use the GTS to check if the CAN communication system is functioning normally.


      Result
      Result Proceed to
      CAN DTC is not output A
      CAN DTC is output (for LHD) B
      CAN DTC is output (for RHD) C

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    C

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  2. CHECK HYBRID CONTROL SYSTEM


    1. Check if DTCs for the hybrid control system are output using the GTS Click here.

      Result
      Result Proceed to
      Hybrid control system DTC is not output A
      Hybrid control system DTC is output B

    B

    GO TO HYBRID CONTROL SYSTEM Click here

    A

  3. CHECK HIGH VOLTAGE FUSE

    CAUTION:

    Be sure to wear insulated gloves.


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

      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. A01FRDPE02
      Text in Illustration
      *A for LHD
      *B for RHD

      Remove the connector cover assembly from the inverter with converter assembly Click here.

      Tech Tips

      Make sure that no foreign objects have entered or contaminated the inverter with converter assembly.

    3. Disconnect the connector of the air conditioning harness from the inverter with converter assembly.


      1. for LHD

        A01FRAS

        Tech Tips

        Make sure that no foreign objects have entered or contaminated the connector of the air conditioning harness.

      2. for RHD

        A01FRF7

        Tech Tips

        Make sure that no foreign objects have entered or contaminated the connector of the air conditioning harness.

    4. A01FUXUE02
      Text in Illustration
      *A for LHD
      *B for RHD

      Disconnect the connector of the No. 4 floor wire from the inverter with converter assembly.

      Tech Tips

      Make sure that no foreign objects have entered or contaminated the connector of the No. 4 floor wire.

    5. A01FS0KE02

      Check that bolts A and B are tightened securely.

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

      Standard Resistance

      Tester Item

      (Tester Connection)

      		 Condition Specified Condition

      High voltage fuse

      (A - B)

      		 Always Below 1 Ω
      Text in Illustration
      *1 High Voltage Fuse

    NG

    REPLACE HIGH VOLTAGE FUSE Click here

    OK

  4. CHECK AIR CONDITIONING HARNESS

    CAUTION:

    Be sure to wear insulated gloves.


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

      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 air conditioning harness Click here.

      Tech Tips

      Make sure that no foreign objects have entered or contaminated the inverter with converter assembly.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      V1-1 (PE) - V3-1 (ACPE) Always Below 1 Ω
      V1-2 (PB) - V3-2 (ACPB) Always Below 1 Ω
      V1-1 (PE) - Body ground Always 10 kΩ or higher
      V1-2 (PB) - Body ground Always 10 kΩ or higher
      V-1 (PE) - V1-2 (PB) Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      f2-1 (PE) - f1-1 (ACPE) Always Below 1 Ω
      f2-2 (PB) - f1-2 (ACPB) Always Below 1 Ω
      f2-1 (PE) - Body ground Always 10 kΩ or higher
      f2-2 (PB) - Body ground Always 10 kΩ or higher
      f2-1 (PE) - f2-2 (PB) Always 10 kΩ or higher

    NG

    REPLACE AIR CONDITIONING HARNESS Click here

    OK

    REPLACE COMPRESSOR WITH MOTOR ASSEMBLY Click here