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
B1476/76 A/C Inverter Load System Malfunction

Any of the following conditions is met:


  • Motor rotation load while the compressor is operating is too large

  • Motor rotation load while the compressor is operating is too small

  • Refrigerant volume

  • Compressor with motor assembly

  • Cooling fan system

  • CAN communication system

 Memorized
DTC Detection Conditions
Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition Power switch on (READY) ○ ○
Malfunction Status Motor rotation load while the compressor is operating is too large ○ -
Motor rotation load while the compressor is operating is too small - ○
Detection Time - -
Number of Trips 1 trip 1 trip

Tech Tips

DTC will be output when conditions for either of the patterns in the table above are met.

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 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.

      for LHD: Click here

      for RHD: Click here

      Result
      Result Proceed to
      CAN communication system DTCs are not output A
      CAN communication system DTCs are output (for LHD) B
      CAN communication system DTCs are output (for RHD) C

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    C

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  2. PERFORM ACTIVE TEST USING GTS


    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 / FC / Active Test.

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


      Powertrain > FC > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Radiator Fan1 Drive the cooling fan controller with motor (for fan side) 0 to 100% -
      Radiator Fan2 Drive the cooling fan controller with motor (for No. 2 fan side) 0 to 100% -

      Powertrain > FC > Active Test
      Tester Display
      Radiator Fan1

      Powertrain > FC > Active Test
      Tester Display
      Radiator Fan2
      OK
      Cooling fan controller with motor operates smoothly.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO COOLING FAN SYSTEM Click here

    OK

  3. CHECK REFRIGERANT PRESSURE


    1. Install a manifold gauge set.

      Click here

    2. Turn the power switch on (READY).

    3. A01MH3OC15
      *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 Click here