RM3660EC _58 Vehicle Interior _080733 HEATING / AIR CONDITIONING _0598792 AIR CONDITIONING SYSTEM(for HV Model (8ZR-FXE)) C

HEATING / AIR CONDITIONING  AIR CONDITIONING SYSTEM(for HV Model (8ZR-FXE))  B14744B  A/C Inverter Cooling/Heating Over Temperature  


DESCRIPTION

The temperature sensor of the compressor with motor assembly detects the A/C inverter temperature.

If the temperature exceeds the maximum, operation of the compressor with motor assembly will be stopped, and this DTC will be stored.

DTC No. Detection Item DTC Detection Condition Trouble Area Memory
B14744B A/C Inverter Cooling/Heating Over Temperature Diagnosis Condition:

Ignition switch ON


Malfunction:

A/C inverter temperature is outside the specified range (temperature too high)


Detection Time:

-


·

Cooling fan system

·

Refrigerant volume

·

Compressor with motor assembly


Memorized

CAUTION / NOTICE / HINT

CAUTION:
·

Before inspecting the high-voltage system, take safety precautions such as wearing insulated gloves and removing the service plug grip to prevent electrical shocks. After removing the service plug grip, put it in your pocket to prevent other technicians from accidentally reconnecting it while you are working on the high-voltage system.

Click hereGeneral>INTRODUCTION>REPAIR INSTRUCTION>PRECAUTION

·

Do not touch the high-voltage connectors or terminals for 10 minutes after the service plug grip is removed.

Click hereEngine / Hybrid System>HYBRID / BATTERY CONTROL>PA10 HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY)>PRECAUTION



NOTICE:
·

After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.

-

Before disconnecting battery:

Click hereGeneral>SETUP>WHEN DISCONNECTING OR RECONNECTING BATTERY TERMINAL>BEFORE DISCONNECTING BATTERY

-

Automatic learning chart:

Click hereGeneral>SETUP>WHEN DISCONNECTING OR RECONNECTING BATTERY TERMINAL>AUTOMATIC LEARNING CHART


·

The hybrid control system and air conditioning system output DTCs separately. Perform troubleshooting for the hybrid control system first if DTCs for both systems are output simultaneously.

Click hereEngine / Hybrid System>HYBRID / BATTERY CONTROL>PA10 HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY)>HOW TO PROCEED WITH TROUBLESHOOTING

·

The air conditioning system uses the CAN communication system. Inspect the communication functions by following How to Proceed with Troubleshooting. Troubleshoot the air conditioning system after confirming that the communication systems are functioning properly.

Click herePower Source / Network>NETWORKING>CAN COMMUNICATION SYSTEM (for HV Model)>HOW TO PROCEED WITH TROUBLESHOOTING



PROCEDURE

1.PERFORM ACTIVE TEST USING GTS
a.

Perform the Active Test according to the display on the GTS.

Powertrain > Engine > Active Test
Tester Display Measurement Item Control Range Restrict Condition
Control the Engine Cooling Fan Control electric cooling fan motor OFF/Low/High Perform this test when vehicle is stopped.
Powertrain > Engine > Active Test
Tester Display
Control the Engine Cooling Fan
50004 372 26
OK:

Electric cooling fan operates smoothly.



Result:
Proceed to
OK
NG



OK

2.CHECK REFRIGERANT PRESSURE

NG

GO TO COOLING FAN SYSTEM

Click hereEngine / Hybrid System>8ZR-FXE (COOLING)>COOLING FAN SYSTEM>ON-VEHICLE INSPECTION


2.CHECK REFRIGERANT PRESSURE
a.

Install a manifold gauge set.

Click hereVehicle Interior>HEATING / AIR CONDITIONING>REFRIGERANT>ON-VEHICLE INSPECTION


b.

Prepare the vehicle according to the table below.

Measurement Condition:
Item Condition
Doors Fully open
A/C Switch On
Recirculation/fresh Control Switch Recirculation
Set Temperature MAX COLD
Blower Speed HI
Air Conditioning Air Inlet Temperature 25 to 35°C (77 to 95°F)


c.

Read the manifold gauge pressure.

Standard Pressure:
Low pressure side:

150 to 250 kPa (1.5 to 2.5 kgf/cm2, 22 to 36 psi)

High pressure side:

1370 to 1570 kPa (14 to 16 kgf/cm2, 199 to 228 psi)



Result:
Proceed to
OK
NG



OK

3.CLEAR DTC

NG

CHARGE REFRIGERANT

Click hereVehicle Interior>HEATING / AIR CONDITIONING>REFRIGERANT>REPLACEMENT


3.CLEAR DTC
a.

Clear the DTCs.

Body Electrical > Air Conditioner > Clear DTCs
50002 450

Result:
Proceed to
NEXT



NEXT

4.CHECK FOR DTC
4.CHECK FOR DTC
a.

Set the vehicle condition when the DTCs are output.

i.

Set the "Inspection Mode".

Click hereGeneral>INTRODUCTION>REPAIR INSTRUCTION>INSPECTION MODE PROCEDURE


ii.

Prepare the vehicle according to the table below for 30 minutes or more.

Item Condition
Blower Speed HI
A/C Switch On
Set Temperature MAX COLD



b.

Check for DTCs.

Body Electrical > Air Conditioner > Trouble Codes
50001 450
NOTICE:

If the engine keeps idling when the ambient temperature is high, the compressor with motor assembly may automatically stop to protect the inverter circuit, and DTC B14744B may be stored.



Result:
Result Proceed to
DTC B14744B is not output A
DTC B14744B is output B



A

USE SIMULATION METHOD TO CHECK

Click hereGeneral>INTRODUCTION>HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS>HOW TO PROCEED WITH TROUBLESHOOTING


B

REPLACE COMPRESSOR WITH MOTOR ASSEMBLY

Click hereVehicle Interior>HEATING / AIR CONDITIONING>COMPRESSOR (for 8ZR-FXE)>REMOVAL