AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System), Diagnostic DTC:B1422/22

DTC Code DTC Name
B1422/22 Compressor Lock Sensor Circuit

SYSTEM 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 cooler compressor assembly is locked and turns the magnet clutch assembly off.

DTC Code DTC Detection Condition Trouble Area
B1422/22 Open or short in the compressor lock sensor circuit.
  • Cooler compressor assembly (A/C lock sensor)

  • Compressor drive belt

  • Harness or connector

  • Air conditioning amplifier assembly

  • CAN communication system

WIRING DIAGRAM

A0094DCE11

INSPECTION PROCEDURE

Tech Tips

As DTC B1422/22 is also output when the compressor drive belt is damaged or loose, inspect the belt before performing troubleshooting.

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Use the intelligent tester to check if the CAN communication system is functioning normally.

      Result
      Result Proceed to
      CAN DTC is not output A
      CAN DTC is output (for LHD with Entry and Start System) B
      CAN DTC is output (for LHD without Entry and Start System) C
      CAN DTC is output (for RHD with Entry and Start System) D
      CAN DTC is output (for RHD without Entry and Start System) E

    B
    C
    D
    E
    A
  2. INSPECT COOLER COMPRESSOR ASSEMBLY (A/C LOCK SENSOR)


    1. A00995SE01

      for 1GR-FE:

      Remove the cooler compressor assembly (A/C lock sensor) Click here.

    2. for 1KD-FTV:

      Remove the cooler compressor assembly (A/C lock sensor) Click here.

    3. for 2TR-FE:

      Remove the cooler compressor assembly (A/C lock sensor) Click here.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 (SSR+) - 2 (SSR-) 20°C (68°F) 160 to 320 Ω
      Result
      Result Proceed to
      OK A
      NG (for 1GR-FE) B
      NG (for 1KD-FTV) C
      NG (for 2TR-FE) D

    B
    C
    D
    A
  3. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - A/C LOCK SENSOR)


    1. Disconnect the G25 amplifier connector.

    2. Disconnect the C39 sensor connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G25-8 (LOCK) - C39-1 (SSR+) Always Below 1 Ω
      G25-13 (SG-2) - C39-2 (SSR-) Always Below 1 Ω
      G25-8 (LOCK) - Body ground Always 10 kΩ or higher
      G25-13 (SG-2) - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      OK (When troubleshooting according to problem symptoms table) A
      OK (When troubleshooting according to the DTC) B
      NG C

    B
    C
    A