AIR CONDITIONING SYSTEM, Diagnostic DTC:B1471/71

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

DESCRIPTION

The A/C inverter assembly monitors power voltage from the main battery in the circuit. It stops compressor control and outputs the DTC when the monitored voltage is outside the specified range.

The output DTC is memorized as previous trouble. Compressor control may not resume unless the power switch is turned off.

DTC No. DTC Detection Condition Trouble Area
B1471/71
  • Open or short in A/C inverter high voltage power resource system.

  • The boost pressure system 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

WIRING DIAGRAM

A01NJ5FE39

INSPECTION PROCEDURE

CAUTION:


  • Wear electrically insulated gloves and pull out the service plug grip before inspection as procedures may require disconnecting high-voltage connectors. Be sure to carry the removed service plug grip because other workers may install it by mistake.

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

Note

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

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Using the intelligent tester to check if the CAN communication system is functioning normally.

      Result
      Result Proceed to
      CAN DTC is not output A
      CAN DTC is output B

    B
    A
  2. CHECK DIAGNOSTIC TROUBLE CODE (HYBRID CONTROL SYSTEM)


    1. Check if DTCs for the hybrid control system are output using the intelligent tester.

      OK
      Hybrid control system DTCs are not output.

    NG
    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.

      CAUTION:

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

      Note

      Do not start the engine with the service plug grip removed because it may cause a malfunction.

    3. Remove the inverter terminal cover.

      Note

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

    4. A01NJFAE01
      Text in Illustration
      *1 Inverter with Converter Assembly
      *2 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

    NG
    OK
  4. INSPECT NO. 4 ENGINE WIRE

    CAUTION:

    Be sure to wear insulated gloves.


    1. A01NN8BE01

      Disconnect the connector from No. 4 engine wire.

    2. A01NKXHE08
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Compressor with Motor Assembly)

      *2

      Front view of wire harness connector

      (to Inverter with Converter Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      e1-1 (PE) - e3-2 (ACPE) Always Below 1 Ω
      e1-2 (PB) - e3-1 (ACPB) Always Below 1 Ω
      e1-1 (PE) - Body ground Always 10 kΩ or higher
      e1-2 (PB) - Body ground Always 10 kΩ or higher

    NG
    OK