AIR CONDITIONING SYSTEM(for Automatic Air Conditioning System), Diagnostic DTC:B1422

DTC Code DTC Name
B1422 Compressor Lock

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)

Tech Tips

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

WIRING DIAGRAM

B006ZM7E01
*a LOCK
*b Magnet Clutch Assembly
*c Air Conditioning Amplifier Assembly
*d CAN Communication Line

CAUTION / NOTICE / HINT

Note


  • 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

  • Inspect the fuses for circuits related to this system before performing the following procedure.

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

    Click here

PROCEDURE


  1. INSPECT MAGNET CLUTCH ASSEMBLY


    1. Remove the compressor assembly with magnetic clutch.

      Click here

    2. Inspect the magnet clutch assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE MAGNET CLUTCH ASSEMBLY Click here

    OK

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


    1. Disconnect the K55 air conditioning amplifier assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C63-1 (SSR+) - K55-21 (LOCK) Always Below 1 Ω
      C63-2 (SSR-) - K55-2 (SG-2) Always Below 1 Ω
      C63-1 (SSR+) or K55-21 (LOCK) - Other terminals and body ground Always 10 kΩ or higher
      C63-2 (SSR-) or K55-2 (SG-2) - Other terminals and body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR