AIR CONDITIONING SYSTEM, Diagnostic DTC:B1471

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

DESCRIPTION

The hybrid vehicle control ECU monitors the voltage of the HV battery. The hybrid vehicle control ECU 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 A/C Inverter High Voltage Power Resource System Malfunction

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

  • Boost inverter malfunctioning

  • Air conditioning 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

B004OX8E05

CAUTION / NOTICE / HINT

CAUTION:


  • Before inspecting the high-voltage system, 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.

  • 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.

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

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


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

      Tech Tips

      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.


      Powertrain > Hybrid Control > Trouble Codes
      Result
      Result Proceed to
      DTCs are not output A
      DTCs are output B

    B

    GO TO HYBRID CONTROL SYSTEM Click here

    A

  3. INSPECT AIR CONDITIONING WIRE

    CAUTION:

    Be sure to wear insulated gloves.


    1. Disconnect the T1 and T2 air conditioning wire connectors.

      Tech Tips

      Click here

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      T1-2 (PB) - T2-1 (ACPB) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT AIR CONDITIONING WIRE Click here

    OK

  4. INSPECT AIR CONDITIONING WIRE

    CAUTION:

    Be sure to wear insulated gloves.


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      T1-1 (PE) - T2-2 (ACPE) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE COMPRESSOR WITH MOTOR ASSEMBLY Click here

    NG

    REPLACE AIR CONDITIONING WIRE Click here

  5. INSPECT AIR CONDITIONING WIRE

    CAUTION:

    Be sure to wear insulated gloves.


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      T1-2 (PB) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE COMPRESSOR WITH MOTOR ASSEMBLY Click here

    NG

    REPLACE AIR CONDITIONING WIRE Click here