Toyota Corolla Cross: A/C Inverter Cooling/Heating Over Temperature (B14744B)

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.

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.

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

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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.

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• 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.

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• 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.

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PROCEDURE

(a) Perform the Active Test according to the display on the GTS.

OK:

Cooling fan operates smoothly.

NG

GO TO COOLING FAN SYSTEM

OK

(a) Install a manifold gauge set.

(b) Prepare the vehicle according to the table below.

(c) 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

*a LO *b HI

Post-procedure1

(d) None

NG

CHARGE REFRIGERANT

OK

(a) Clear the DTCs.

NEXT

Pre-procedure1

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

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

HINT:

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(2) Prepare the vehicle according to the table below for 30 minutes.

Procedure1

(b) Check for DTCs.

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.

Post-procedure1

(c) None

A

USE SIMULATION METHOD TO CHECK

B

REPLACE COMPRESSOR WITH MOTOR ASSEMBLY

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