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. When the difference becomes too 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


  • Diagnosis condition: Cooler compressor assembly operating

  • Malfunction status: Open or short in cooler compressor circuit

  • Detection time: None (Present malfunction), continuously for 3 seconds or more (Past malfunction)

  • Cooler compressor assembly

  • Harness or connector

  • Air conditioning amplifier assembly

 Memorized

Tech Tips

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

WIRING DIAGRAM

B006DV1E01

CAUTION / NOTICE / HINT

Note


  • 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.

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Using the GTS, check if the CAN communication system is functioning normally.

      Click here

      OK
      CAN communication system DTCs are not output.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO CAN COMMUNICATION SYSTEM Click here

    OK

  2. INSPECT COOLER COMPRESSOR ASSEMBLY


    1. Remove the cooler compressor assembly.

      Click here

    2. Inspect the cooler compressor assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE COOLER COMPRESSOR ASSEMBLY Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (COOLER COMPRESSOR ASSEMBLY - AIR CONDITIONING AMPLIFIER ASSEMBLY)


    1. Disconnect the D72 cooler compressor assembly connector.

    2. Disconnect the G64 air conditioning amplifier assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D72-1 (SSR+) - G64-21 (LOCK) Always Below 1 Ω
      D72-2 (SSR-) - G64-2 (SG-2) Always Below 1 Ω
      D72-1 (SSR+) - D72-2 (SSR-) Always 10 kΩ or higher
      D72-1 (SSR+) or G64-21 (LOCK) - Other terminals and body ground Always 10 kΩ or higher
      D72-2 (SSR-) or G64-2 (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