B1476

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.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK DTC (CAN COMMUNICATION SYSTEM)

(a) Use 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 (ELECTRICAL FAN)

(a) Select the Active Test, using the Techstream to generate a control command, and then check that the electrical fan operates.

Air Conditioner





OK:

Electrical fan operates smoothly.

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

3. CHECK REFRIGERANT PRESSURE

(a) Install the 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)

High pressure side
1.37 to 1.57 MPa (14 to 16 kgf/cm2)

NG -- CHARGE REFRIGERANT Service and Repair

OK -- REPLACE COMPRESSOR WITH MOTOR ASSEMBLY Removal