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

for Preparation Click here


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.

DTC No.
DTC Detecting Condition
Trouble Area
B1475/75
Cooling water temperature in the inverter is outside the specified range (temperature is too high), or there is an open or short to ground in the temperature sensor circuit.
  1. Cooling fan system
  1. SFI system
  1. Refrigerant volume
  1. w/ Motor Compressor assembly

WIRING DIAGRAM


E109280E03


INSPECTION PROCEDURE

1.PERFORM ACTIVE TEST BY INTELLIGENT TESTER

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch ON and the intelligent tester main switch on.

  1. Select the item below in the ACTIVE TEST and then check that the fan operates.


ACTIVE TEST / AIR CONDITIONER 
Item
Test Details/Display
(Range)
Diagnostic Note
Electrical fan
Electrical fan / OFF, ON
-

OK:
Electrical fan operates smoothly.



NG
GO TO COOLING FAN SYSTEM
OK


2.CHECK DIAGNOSTIC TROUBLE CODE

  1. Check if DTCs for the SFI system are output using the intelligent tester.

OK:
DTCs are not output in the SFI system.



NG
GO TO SFI SYSTEM
OK


3.CHECK REFRIGERANT VOLUME


  1. Check the sight glass on the liquid tube.



      E108160E02

    1. LHD:



      2. E110731E01

    2. RHD:

  1. Prepare the vehicle according to the table below.
    Item
    		Condition
    Vehicle door
    		All fully open
    Temperature setting
    		MAX. COLD
    Blower speed
    		HI
    A/C
    		ON
    Ignition switch
    		ON

  1. Check the sight glass according to the following table.

    Item
    		Symptom
    		Amount of refrigerant
    		Corrective Action
    1
    		Bubbles exist
    		Insufficient*
    1. Check for gas leakage and repair if necessary.
    2. Add refrigerant until bubbles disappear.
    2
    		No bubbles exist
    		Empty, insufficient or excessive
    		Refer to 3 and 4
    3
    		No temperature difference between compressor inlet and outlet
    		Empty or nearly empty
    1. Check for gas leakage with gas leak detector and repair if necessary.
    2. Evacuate the A/C system and recharge the proper amount of refrigerant.
    4
    		Considerable temperature difference between compressor inlet and outlet
    		Proper or excessive
    		Refer to 5 and 6
    5
    		Immediately after air conditioning is turned off, refrigerant clears
    		Excessive
    1. Discharge refrigerant.
    2. Evacuate the A/C system and recharge the proper amount of refrigerant.
    6
    		Immediately after air conditioning is turned off, refrigerant foams and then becomes clear
    		Proper
    		-

*: Bubbles in the sight glass with the vehicle's interior above 35°C (95°F) can be considered normal if cooling is sufficient.

NOTICE:
  1. If the amount of refrigerant is low, the compressor may stop in approximately 1 minute.
  2. 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 the air conditioning is turned off, refrigerant foams and then becomes clear.



NG
CHARGE REFRIGERANT
OK


4.READ OUTPUT DTC (DTC B1475/75)

  1. Clear the DTC (Click here).

  1. Idle the engine.

  1. Blower speed switch is at "HI".

  1. A/C switch is ON.

  1. Read the DTC (Click here).

    Result:

    Result
    		Proceed to
    DTC B1475/75 is output (normal)
    		A
    DTC B1475/75 is not output
    		B

NOTICE:
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