AIR CONDITIONING SYSTEM, Diagnostic DTC:B1476/76

DTC Code DTC Name
B1476/76 A/C Inverter Load System Malfunction

DESCRIPTION

The operation of the compressor with motor assembly is stopped and a DTC is stored if the rotation load is too large or too small while the compressor with motor assembly is operating.

Possible causes are refrigerant leaks, overcharged refrigerant, insufficient cooling because of a condenser fan circuit malfunction, or compressor lock.

DTC No. DTC Detection Condition Trouble Area
B1476/76 Motor rotation load while the compressor is operating is too large or too small.

  • Refrigerant volume


  • Compressor with motor assembly


  • Cooling fan system

  • CAN communication system

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


  • 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. Inspect DTCs following the diagnosis 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 Techstream 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

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  2. PERFORM ACTIVE TEST USING TECHSTREAM


    1. Connect the Techstream to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the Techstream on.

    4. Enter the following menus: Powertrain / Engine and ECT / Active Test.

    5. Check the operation by referring to the table below.

      Engine and ECT
      Tester Display Test Part Control Range Diagnostic Note
      Control the Electric Cooling Fan Electric cooling fan OFF, ON -

    NG

    GO TO COOLING FAN SYSTEM Click here

    OK

  3. CHECK REFRIGERANT PRESSURE


    1. Install a manifold gauge set Click here.

    2. A01I5XC

      Read the manifold gauge pressure when the following conditions are established.


      1. Prepare the vehicle according to the chart below.

        Item Condition
        Vehicle Doors All fully open
        Temperature Setting MAX COLD
        Blower Speed HI
        A/C switch ON
        R/F Switch

        RECIRCULATION

        (30 to 35°C (86 to 95°F))
        Standard Pressure
        Low pressure side
        150 to 250 kPa (1.5 to 2.5 kgf/cm2, 22 to 36 psi)
        High pressure side
        1370 to 1570 kPa (14.0 to 16.0 kgf/cm2, 199 to 228 psi)

    NG

    CHARGE REFRIGERANT Click here

    OK

    REPLACE COMPRESSOR WITH MOTOR ASSEMBLY Click here