A/C Inverter Load System Malfunction - Air Conditioning System (for Manual Air Conditioning System)

AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Manual Air Conditioning System): B1476/76: A/C Inverter Load System Malfunction

DTC 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 CAN COMMUNICATION SYSTEM
(a) Using the Techstream, check if the CAN communication system is functioning normally.
Result:






B -- GO TO CAN COMMUNICATION SYSTEM
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) and turn the Techstream on.
(c) Select the item below in the Active Test and then check that the fan operates.

Active Test / Air Conditioner:





OK:
Electrical fan operates smoothly.
NG -- GO TO COOLING FAN SYSTEM
OK -- Continue to next step.
3. CHECK REFRIGERANT PRESSURE
(a) Install a manifold gauge set.





(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
OK -- REPLACE COMPRESSOR WITH MOTOR ASSEMBLY