B1475

AIR CONDITIONING: AIR CONDITIONING SYSTEM: B1475: A/C Inverter Cooling / Heating System Malfunction

DTC B1475 - A/C Inverter Cooling / Heating System Malfunction

CAUTION / NOTICE / HINT

DESCRIPTION

The A/C inverter in the A/C inverter monitors the cooling water temperature with the temperature sensor. It stops compressor control and outputs the DTC when the monitored temperature is outside specified range (too high or too low).
The hybrid system and the air conditioning system monitor the cooling water temperature separately. If DTCs referring to an inverter cooling system malfunction are output simultaneously, there may be trouble such as insufficient cooling water.
If DTCs are output only for the air conditioning system, there may be an open or short in the temperature sensor circuit in the inverter.





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 COOLING WATER
NOTE: Even if DTCs are output only for the air conditioning system, inspect the cooling system first and check that it is normal as there may be trouble such as insufficient cooling water.

NG -- ADD COOLING WATER
OK -- Continue to next step.

2. CHECK DIAGNOSTIC TROUBLE CODE
(a) Check if DTCs for the hybrid control system are output using Techstream.
OK:
DTCs are not output in the hybrid control system.
NG -- GO TO HYBRID CONTROL SYSTEM
OK -- REPLACE A/C INVERTER