DTC    B1476/76    A/C Inverter Load System Malfunction

for Preparation Click here


DESCRIPTION

The compressor with motor assembly stops compressor control and outputs this DTC if the rotation load is too large or too small while controlling motor rotation in the compressor with motor assembly.
Possible causes are refrigerant gas leakage, overcharged refrigerant gas, 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.
  1. Refrigerant volume
  1. Compressor with motor assembly
  1. Cooling fan system
  2. CAN communication system

INSPECTION PROCEDURE

CAUTION:
  1. 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.
  2. Do not touch the high-voltage connectors or terminals for 10 minutes after the service plug grip is removed.

NOTICE:
  1. After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work (Click here).
  2. The hybrid control system and air conditioning system output DTCs separately. Inspect DTCs following the flow chart for the hybrid control system first if any DTCs from those systems are output simultaneously.

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
GO TO CAN COMMUNICATION SYSTEM (Click here)
A


2.PERFORM ACTIVE TEST USING INTELLIGENT TESTER

  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Turn the intelligent tester on.

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

  1. 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 or ON
-

OK:
Electric cooling fan operates smoothly.



NG
GO TO COOLING FAN SYSTEM (Click here)
OK


3.CHECK REFRIGERANT PRESSURE

  1. Install a manifold gauge set (Click here).



    E050573

  1. 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:
      0.15 to 0.25 MPa (1.5 to 2.5 kgf/cm2, 21.3 to 35.6 psi)
      High pressure side:
      1.37 to 1.57 MPa (14 to 16 kgf/cm2, 199 to 228 psi)



NG
CHARGE REFRIGERANT (Click here)
OK

REPLACE COMPRESSOR WITH MOTOR ASSEMBLY (Click here)