DTC B1476: A/C Inverter Load System Malfunction [11/2018 - 02/2019]: Procedure

1. Using the Techstream, check if the CAN communication system is functioning normally.

   Refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2018 - 02/2019]

   Result

   Result	Proceed to
   CAN communication system DTCs are not output	A
   CAN communication system DTCs are output	B

Result: 

B 

GO TO CAN COMMUNICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2018 - 02/2019] 

Result: 

A 

See step  2

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 / Active Test.
5. Check the operation by referring to the table below.

   Powertrain > Engine > Active Test 

   Tester Display	Measurement Item	Control Range	Restrict Condition
   Control the Engine Cooling Fan Duty Ratio	Electric cooling fan motor operation	0 to 100 (%)	Perform this test when vehicle is stopped.

   Powertrain > Engine > Active Test 

   Tester Display
   Control the Engine Cooling Fan Duty Ratio

   OK

   Electric cooling fan operates smoothly.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

GO TO COOLING FAN SYSTEM. Refer to  ON-VEHICLE INSPECTION [11/2018 - 02/2019] 

Result: 

OK 

See step  3

1. Install a manifold gauge set.
   1. for HFC-134a (R134a): Refer to ON-VEHICLE INSPECTION [11/2018 - 08/2020]
   2. for HFO-1234yf (R1234yf): Refer to ON-VEHICLE INSPECTION [11/2018 - 02/2019]
2. Turn the power switch on (READY).
3. Read the manifold gauge pressure when the following conditions are met.
   1. Prepare the vehicle according to the table below.
      MEASUREMENT CONDITION:
      
      

      Item	Condition
      Vehicle Condition	Power switch on (READY)
      Doors	Fully closed (windows also fully closed)
      A/C Switch	On
      Recirculation/fresh Control Switch	Recirculation
      Set Temperature	MAX COLD
      Blower Speed	HI
      Air Conditioning Air Inlet 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

Result: 

OK 

REPLACE COMPRESSOR WITH MOTOR ASSEMBLY. Refer to  REMOVAL [11/2018 - 02/2019] 

Result: 

NG 

CHARGE REFRIGERANT 

1. for HFC-134a (R134a): Refer to REPLACEMENT [11/2018 - 08/2020]
2. for HFO-1234yf (R1234yf): Refer to REPLACEMENT [11/2018 - 02/2019]