B1476

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

DTC B1476 - A/C Inverter Load System Malfunction

CAUTION / NOTICE / HINT

DESCRIPTION

The A/C inverter stops compressor control and outputs the DTC if the rotation load is too great or too small while controlling motor rotation in the A/C inverter.
HINT: Possible reasons could be as follows: Load is low when the refrigerant gas leaks, or load is too great when refrigerant gas is excessively charged, insufficient cooling performance due to condenser fan circuit trouble, or the compressor locked up.





NOTE: The A/C inverter is integrated with the inverter with converter. It is necessary to replace the PCU box if the A/C inverter (inverter with converter) needs to be replaced because the A/C inverter (inverter with converter) cannot be replaced alone.

INSPECTION PROCEDURE

PROCEDURE

1. CHECK COOLER CONDENSER ASSEMBLY
(a) Turn the power switch OFF and ON (READY).
(b) Set the A/C temperature setting to "MAX. COOL" and the blower to " LO", and turn the A/C switch ON.
(c) Check operation of the condenser fan.
OK:
The condenser fan rotates.
NG -- INSPECT COOLING FAN SYSTEM
OK -- Continue to next step.

2. CHECK HFC-134A (R134A)




(a) Inspect refrigerant volume.
(1) Check the sight glass of the cooler unit refrigerant liquid pipe E.
(2) Set the vehicle according to the conditions below.






(3) Check the sight glass.





HINT: *: Bubbles in the sight glass with room temperature higher than usual can be considered normal if cooling is sufficient.

NG -- CHARGE REFRIGERANT
OK -- REPLACE ELECTRIC INVERTER COMPRESSOR