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 compressor is locked, and turns the magnetic clutch off.

DTC Code DTC Detection Condition Trouble Area
B1422/22 An open or short in the compressor lock sensor circuit.

  • CAN communication line

  • Cooler compressor assembly

  • Harness or connector

  • Air conditioning amplifier assembly

WIRING DIAGRAM


  1. w/ Rear Heater:

    A01X98HE05

  2. w/o Rear Heater:

    A01XBXVE01

CAUTION / NOTICE / HINT

Note


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


  • The air conditioning system uses the CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting Click here.

PROCEDURE


  1. INSPECT MAGNET CLUTCH ASSEMBLY


    1. Remove the magnet clutch assembly.


    2. Inspect the magnet clutch assembly.


      Result
      Result Proceed to
      OK A
      NG (for 1GR-FE) B
      NG (for 1VD-FTV) C
      NG (for 1UR-FE) D
      NG (for 3UR-FE) E

    B

    REPLACE MAGNET CLUTCH ASSEMBLY Click here

    C

    REPLACE MAGNET CLUTCH ASSEMBLY Click here

    D

    REPLACE MAGNET CLUTCH ASSEMBLY Click here

    E

    REPLACE MAGNET CLUTCH ASSEMBLY Click here

    A

  2. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY


    1. w/ Rear Heater:


      1. Remove the air conditioning amplifier assembly with its connectors still connected Click here.

        A01X2B0E04
        Text in Illustration
        *a

        Component with harness connected

        ((Air Conditioning Amplifier Assembly)

        		 *b Waveform

      2. Measure the waveform of the connector.

        Measurement Condition
        Item Contents
        Terminal No. (Symbol) E35-30 (LOCK) - E35-32 (SG-2)
        Tool Setting 200 mV/DIV., 10 ms/DIV.
        Condition

        • Engine idling

        • A/C switch on

        • Blower switch LO

    2. w/o Rear Heater:

      A01X53RE01
      Text in Illustration
      *a

      Component with harness connected

      ((Air Conditioning Amplifier Assembly)

      		 *b Waveform

      1. Remove the air conditioning amplifier assembly with its connectors still connected Click here.

      2. Measure the waveform of the connector.

        Measurement Condition
        Item Contents
        Terminal No. (Symbol) E81-8 (LOCK) - E81-13 (SG-2)
        Tool Setting 200 mV/DIV., 10 ms/DIV.
        Condition

        Engine running

        A/C switch on

        Blower switch LO

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    NG

  3. INSPECT COOLER COMPRESSOR ASSEMBLY


    1. Remove the cooler compressor assembly.


    2. Inspect the cooler compressor assembly.


      Result
      Result Proceed to
      OK A
      NG (for 1GR-FE) B
      NG (for 1VD-FTV) C
      NG (for 1UR-FE) D
      NG (for 3UR-FE) E

    B

    REPLACE COOLER COMPRESSOR ASSEMBLY Click here

    C

    REPLACE COOLER COMPRESSOR ASSEMBLY Click here

    D

    REPLACE COOLER COMPRESSOR ASSEMBLY Click here

    E

    REPLACE COOLER COMPRESSOR ASSEMBLY Click here

    A

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


    1. w/ Rear Heater:


      1. Disconnect the E35 air conditioning amplifier assembly connector.

      2. Disconnect the C30 cooler compressor assembly connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        E35-30 (LOCK) - C30-1 (SSR+) Always Below 1 Ω
        E35-32 (SG-2) - C30-2 (SSR-) Always Below 1 Ω
        C30-1 (SSR+) - C30-2 (SSR-) Always 10 kΩ or higher
        E35-30 (LOCK) or C30-1 (SSR+) - Body ground Always 10 kΩ or higher
        E35-32 (SG-2) or C30-2 (SSR-) - Body ground Always 10 kΩ or higher

    2. w/o Rear Heater:


      1. Disconnect the E81 air conditioning amplifier assembly connector.

      2. Disconnect the C30 cooler compressor assembly connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        E81-8 (LOCK) - C30-1 (SSR+) Always Below 1 Ω
        E81-13 (SG-2) - C30-2 (SSR-) Always Below 1 Ω
        C30-1 (SSR+) - C30-2 (SSR-) Always Below 1 Ω
        E81-8 (LOCK) or C30-1 (SSR+) - Body ground Always 10 kΩ or higher
        E81-13 (SG-2) or C30-2 (SSR-) - Body ground Always 10 kΩ or higher

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR