Toyota Corolla Cross: A/C Inverter Local Missing Message (B149887)

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 or abnormal information is received.

This DTC is also detected if high-voltage electricity supplied from the inverter with converter assembly to the compressor control circuit is shut off.

This DTC will be stored as a history DTC.

HINT:

If the conditions of either of these patterns are detected, a DTC will be stored

WIRING DIAGRAM

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:

• Inspect the fuses for circuits related to this system before performing the following procedure.
• 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) Check if hybrid control system DTCs are output.

B

GO TO HYBRID CONTROL SYSTEM

A

Pre-procedure1

(a) Disconnect the C143 compressor with motor assembly connector.

(b) Disconnect the A192 hybrid vehicle control ECU connector.

(c) Disconnect the O206 battery state sensor assembly connector.

Procedure1

(d) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Post-procedure1

(e) None

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

CAUTION:

Do not disconnect the connector on the high-voltage side.

(a) Measure the voltage and resistance according to the value(s) in the table below.

Standard Voltage:

Standard Resistance:

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

CAUTION:

Be sure to wear insulated gloves.

Pre-procedure1

(a) Remove the HV air conditioning wire.

HINT:

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Procedure1

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Post-procedure1

(c) None

OK

REPLACE COMPRESSOR WITH MOTOR ASSEMBLY

NG

REPLACE HV AIR CONDITIONING WIRE

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