RM38T0EC _58 Vehicle Interior _104612 HEATING / AIR CONDITIONING _0601796 AIR CONDITIONING SYSTEM(for HEV Model) C

HEATING / AIR CONDITIONING  AIR CONDITIONING SYSTEM(for HEV Model)  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:

READY ON


Malfunction Status:

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


Detection Time:

None


·

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>HYBRID CONTROL SYSTEM>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.

Click hereGeneral>INTRODUCTION>REPAIR INSTRUCTION>PRECAUTION

·

When the cable is disconnected from the negative (-) auxiliary battery terminal, the memory of various systems will be cleared. Because of this, be sure to make a record of the contents memorized in each system before starting work. When work is finished, adjust each system to its previous state.

·

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>HYBRID CONTROL SYSTEM>DIAGNOSTIC TROUBLE CODE CHART

·

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 hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING SYSTEM (for HEV 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 Diagnostic Note
Control the Engine Cooling Fan Control the cooling fan OFF / Low / High -
Powertrain > Engine > Active Test
Tester Display
Control the Engine Cooling Fan
50004 372 26
OK:

Cooling fan operates smoothly.



Result:
Proceed to
OK
NG



OK

2.CHECK REFRIGERANT PRESSURE

NG

GO TO COOLING FAN SYSTEM

Click hereEngine / Hybrid System>M20F-FXS, M20G-FXS (COOLING)>COOLING FAN SYSTEM>ON-VEHICLE INSPECTION


2.CHECK REFRIGERANT PRESSURE
a.

Install a manifold gauge set.


b.

Prepare the vehicle according to the table below.

Item Condition
Vehicle doors Fully open
Temperature setting MAX COLD
Blower speed HI
A/C switch On
Recirculation/fresh switch RECIRCULATION
Interior temperature 25 to 35°C (77 to 95°F)


c.
E114867C20
1.198,1.531 1.427,1.771 0.229,0.24 10 *a 2.25,1.531 2.479,1.771 0.229,0.24 10 *b
*a LO
*b HI


Read the manifold gauge pressure when the following conditions are met.

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)


HINT:

The standard pressure is applicable when the refrigerant gas is filled to the correct amount.


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.READ OUTPUT DTC (DTC B14744B)
4.READ OUTPUT DTC (DTC B14744B)
a.

Set the vehicle so that the conditions for detecting DTCs are met.

i.

Put the vehicle in Inspection Mode (engine forced to idle).

HINT:

Click hereGeneral>INTRODUCTION>REPAIR INSTRUCTION>INSPECTION MODE PROCEDURE



ii.

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

Item Condition
Blower speed HI
A/C switch On
Temperature setting MAX COLD



b.

Check for DTCs.

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

If the engine idles continuously when 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
B14744B is not output A
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 HEV Model)>REMOVAL