Toyota Avalon 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.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

B1422

Compressor Lock

Open or short in A/C lock sensor circuit

  • Magnet clutch assembly
  • Harness or connector
  • Air conditioning amplifier assembly

Memorized

(3 seconds or more)

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.

    Click here

  • 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.

    Click here

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

    Click here

PROCEDURE

1.

INSPECT MAGNET CLUTCH ASSEMBLY

(a) Remove the compressor assembly with magnetic clutch.

Click here

(b) Inspect the magnet clutch assembly.

Click here

NG

REPLACE MAGNET CLUTCH ASSEMBLY

OK

2.

CHECK HARNESS AND CONNECTOR (MAGNET CLUTCH ASSEMBLY - AIR CONDITIONING AMPLIFIER ASSEMBLY)

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

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

C60-1 (SSR+) - G36-21 (LOCK)

Always

Below 1 Ω

C60-2 (SSR-) - G36-2 (SG-2)

Always

Below 1 Ω

C60-1 (SSR+) or G36-21 (LOCK) - Other terminals and body ground

Always

10 kΩ or higher

C60-2 (SSR-) or G36-2 (SG-2) - Other terminals and body ground

Always

10 kΩ or higher

OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

    Evaporator Temperature Circuit or Evaporator Fin Thermistor (B1413)

    Open in Pressure Sensor Circuit / Abnormal Refrigerant Pressure (B1423)

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