Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Compressor Lock (B1422)

DESCRIPTION

The ECM sends the engine speed signal to the air conditioning amplifier assembly via CAN communication.

The air conditioning amplifier assembly reads the difference between compressor speed and engine speed. If the difference becomes excessively large, the air conditioning amplifier assembly determines that the compressor is locked, and turns the magnet clutch assembly off.

HINT:

The air conditioning amplifier assembly stores the DTC if the malfunction has occurred for the period of time indicated in the brackets.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

• The air conditioning system uses the CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the air conditioning system after confirming that the communication system is functioning properly.

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• ECM malfunctions can affect the storage of this DTC. Therefore, check all SFI system DTCs and confirm that the system is normal before performing the following inspection.

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• After replacing the air conditioning amplifier assembly, make sure to perform Initialization Servo Motor.

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PROCEDURE

(a) Remove the compressor assembly with magnetic clutch.

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(b) Inspect the magnet clutch assembly.

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NG

REPLACE MAGNET CLUTCH ASSEMBLY

OK

(a) Disconnect the G36 air conditioning amplifier assembly connector.

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

Standard Resistance:

OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR