| Last Modified: 07-31-2024 | 6.11:8.1.0 | Doc ID: RM1000000026Z40 |
| Model Year Start: 2023 | Model: Corolla | Prod Date Range: [09/2022 - ] |
| Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): B14721C; A/C Inverter High Voltage Output Circuit Voltage Out of Range; 2023 - 2025 MY Corolla Corolla HV [09/2022 - ] | ||
|
DTC |
B14721C |
A/C Inverter High Voltage Output Circuit Voltage Out of Range |
DESCRIPTION
The inverter in the compressor with motor assembly outputs high voltage 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:
Malfunction:
Detection Time:
|
Compressor with motor assembly |
Memorized |
DTC Detection Condition Combination Table
|
Vehicle Condition |
|||
|---|---|---|---|
|
Pattern 1 |
Pattern 2 |
||
|
Diagnosis Condition |
There is a compressor operation request. |
○ |
○ |
|
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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![2019 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 - ]; INTRODUCTION: REPAIR INSTRUCTION: PRECAUTION](/t3Portal/stylegraphics/info.gif)
-
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.
-
Before disconnecting battery:
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Automatic learning chart:
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Before disconnecting battery:
-
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.
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NOTICE:
If this DTC is output even once, replace the compressor with motor assembly as an internal malfunction has occurred.
| NEXT |
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END |
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