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 this 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 due to a condenser fan circuit malfunction, or compressor lock.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

Note

B1476/76

A/C Inverter Load System Malfunction

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

Memorized

-

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:

  • 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 hereClick hereClick hereClick 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.

    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

    A

  2. PERFORM ACTIVE TEST USING GTS (CONTROL THE ELECTRIC COOLING FAN)

    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

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

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

    Powertrain > Engine and ECT > Active Test

    Tester Display

    Measurement Item

    Control Range

    Diagnostic Note

    Control the Electric Cooling Fan

    Control electric cooling fan motor

    ON/OFF

    Perform this test when the following conditions are met:

    • Power switch on (IG)

    • Engine stopped

    • Shift lever in P

    Powertrain > Engine and ECT > Active Test

    Tester Display

    Control the Electric Cooling Fan

    Result

    Proceed to

    OK

    NG
    NG

    GO TO COOLING FAN SYSTEM

    Click here

    OK

  3. CHECK REFRIGERANT PRESSURE

    1. Install a manifold gauge set.

    2. Turn the power switch on (READY).

    3. E114867C15

      *a

      LO

      *b

      HI

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

      1. Prepare the vehicle according to the table below.

        Item

        Condition

        Vehicle doors

        Fully open

        Temperature setting

        MAX COLD

        Blower speed

        HI

        A/C switch

        On

        Recirculation/fresh switch

        RECIRCULATION

        Interior temperature

        25 to 35°C (77 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 to 16 kgf/cm2, 199 to 228 psi)

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE COMPRESSOR WITH MOTOR ASSEMBLY

    Click here

    NG

    CHARGE REFRIGERANT