A/C Inverter Load System Malfunction

HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM: B1476/76: A/C Inverter Load System Malfunction
B1476/76 - A/C Inverter Load System Malfunction

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.





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.
NOTICE:
* 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 Service Precautions.
* 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.

PROCEDURE

1. CHECK CAN COMMUNICATION SYSTEM

(a) Using the Techstream to check if the CAN communication system is functioning normally.

Result:





B -- GO TO CAN COMMUNICATION SYSTEM How to Proceed With Troubleshooting
A -- Continue to next step.

2. PERFORM ACTIVE TEST USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine and ECT / Active Test.

(e) Check the operation by referring to the table below.

Engine and ECT





NG -- GO TO COOLING FAN SYSTEM Cooling Fan Circuit
OK -- Continue to next step.

3. CHECK REFRIGERANT PRESSURE

(a) Install a manifold gauge set Refrigerant.

(b) Read the manifold gauge pressure when the following conditions are established.





(1) Prepare the vehicle according to the chart below.





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 Service and Repair

OK -- REPLACE COMPRESSOR WITH MOTOR ASSEMBLY Removal