B1475

AIR CONDITIONING SYSTEM: B1475/75: A/C Inverter Cooling / Heating System Malfunction

DTC B1475/75 - A/C Inverter Cooling / Heating System Malfunction

DESCRIPTION

The temperature sensor of the w/ motor compressor assembly detects inverter temperature.
If the temperature exceeds the maximum, the w/ motor compressor assembly stops compressor operation, and DTC will be output.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. PERFORM ACTIVE TEST BY TECHSTREAM
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch ON and push the Techstream main switch on.
(c) Select the item below in the ACTIVE TEST and then check that the fan operates.

Air Conditioner

OK:
Electrical fan operates smoothly.
NG -- GO TO COOLING FAN SYSTEM
OK -- Continue to next step.
2. CHECK DIAGNOSTIC TROUBLE CODE
(a) Check if DTCs for the SFI system are output using the Techstream.
OK:
DTCs are not output in the SFI system.
NG -- GO TO SFI SYSTEM
OK -- Continue to next step.
3. CHECK REFRIGERANT VOLUME

(a) Check the sight glass on the liquid tube.
(b) Prepare the vehicle according to the table below.

*: Bubbles in the sight glass with the vehicle's interior above 35°C (95°F) can be considered normal if cooling is sufficient.
NOTICE:
- If the amount of refrigerant is low, the compressor may stop in approximately 1 minute.
- If the compressor stops because of any trouble in the w/ motor compressor assembly, inspection may not be possible. For such cases, the w/ motor compressor assembly should be replaced.

OK:
Immediately after air conditioning is turned off, refrigerant foams and then becomes clear.
NG -- CHARGE REFRIGERANT
OK -- Continue to next step.
4. READ OUTPUT DTC (DTC B1475/75)
(a) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.
(b) Engine idling.
(c) Blower switch is HI.
(d) A/C switch is ON.
(e) Read the DTC Reading and Clearing Diagnostic Trouble Codes.
Result:

NOTE: If the engine keeps idling when ambient temperature is high, the compressor may automatically stop to protect the inverter circuit, and DTC B1475/75 may be stored.

B -- REPLACE W/MOTOR COMPRESSOR ASSEMBLY
A -- SYSTEM OK