Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: A/C Inverter High Voltage Output Circuit Voltage Out of Range (B14721C)

Toyota Corolla Cross (2022-2024) Service Manual / Vehicle Interior / Heating / Air Conditioning / Air Conditioning System (for Hev Model) / A/C Inverter High Voltage Output Circuit Voltage Out of Range (B14721C)

DESCRIPTION

The inverter in the compressor with motor assembly outputs high-voltage electricity to operate the motor. If there is an open or short in the output circuit, the hybrid vehicle control ECU will stop compressor operation and store this DTC. This DTC will be stored as a history DTC. The compressor operation remains stopped until both the history and current DTCs are cleared.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

B14721C

A/C Inverter High Voltage Output Circuit Voltage Out of Range

Diagnosis Condition:

  • Compressor operation is commanded

Malfunction Status:

  • Open or short in A/C inverter high voltage output circuit

Detection Time:

  • None

Compressor with motor assembly

Memorized
DTC Detection Condition Combination Table
 

Vehicle Condition

Pattern 1

Pattern 2

Diagnosis Condition

Compressor operation is commanded

○

○

Malfunction

Open in A/C inverter high voltage output circuit

○

-

Short in A/C inverter high voltage output circuit

-

○

Detection Time

-

-

Trip Count

1 trip

1 trip

HINT:

If the conditions of either of these patterns are detected, a 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

1.

REPLACE COMPRESSOR WITH MOTOR ASSEMBLY

(a) Replace the compressor with motor assembly.

HINT:

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NOTICE:

As this DTC is stored when the compressor with motor assembly is malfunctioning, it is necessary to replace the compressor with motor assembly.

NEXT

END

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    DESCRIPTION The hybrid vehicle control ECU and compressor with motor assembly communicate via direct line. Compressor control is stopped and this DTC is stored if communication information is cut off

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