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

DTC Code DTC Name
B1422 Compressor Lock Sensor Circuit

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 assembly off.

DTC No. Detection Item DTC Detection Condition Trouble Area Memory
B1422 Compressor Lock Sensor Circuit Open or short in A/C lock sensor circuit

  • Magnetic clutch assembly

  • Cooler compressor assembly

  • Harness or connector between cooler compressor assembly and air conditioning amplifier assembly

  • Air conditioning amplifier assembly

Memorized

(3 sec. or more)*

WIRING DIAGRAM

A002ANNE02

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

      Result
      Result Proceed to
      CAN communication system DTCs are not output A
      CAN communication system DTCs are output B

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  2. PERFORM ACTIVE TEST USING GTS


    1. Disconnect the magnetic clutch assembly connector.

    2. Install SST to the connector on the magnetic clutch relay side.

      SST
      09843-18040

    3. Connect the GTS to the DLC3.

    4. Start the engine.

    5. Turn the GTS on.

    6. Enter the following menus: Body Electrical / Air Conditioner / Active Test.


      Body Electrical > Air Conditioner > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Magnetic Clutch Relay Air conditioning system operation OFF or ON -
    7. A002C49C02
      *a

      Front view of wire harness connector

      (to Magnetic Clutch Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      1 - Body ground

      • Engine is running

      • Active Test above is being performed

      		 11 to 14 V

      Tech Tips

      When performing the Active Test, voltage between 11 and 14 V is output for approximately 3 seconds.

      Result
      Proceed to
      OK
      NG

    NG

    GO TO AIR CONDITIONING COMPRESSOR MAGNETIC CLUTCH CIRCUIT Click here

    OK

  3. INSPECT MAGNETIC CLUTCH ASSEMBLY


    1. Connect the magnetic clutch assembly connector.

    2. Disconnect the C12 cooler compressor assembly connector.

    3. A0028SSC01
      *a

      Component without harness connected

      (Magnetic Clutch Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 (MG+) - Body ground 20°C (68°F) 3.8 to 4.2 Ω

    4. Connect a positive (+) lead from the battery to terminal 3 (MG+) and check that the following occurs: 1) the magnetic clutch assembly operating sound can be heard, and 2) the magnetic clutch hub and rotor lock.

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE MAGNETIC CLUTCH ASSEMBLY Click here

    OK

  4. INSPECT COOLER COMPRESSOR ASSEMBLY

    A0028SSC02
    *a

    Component without harness connected

    (Cooler Compressor Assembly)

    1. 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
      Proceed to
      OK
      NG

    NG

    REPLACE COOLER COMPRESSOR ASSEMBLY Click here

    OK

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


    1. Disconnect the F80 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
      C12-1 (SSR+) - F80-8 (LOCK) Always Below 1 Ω
      C12-2 (SSR-) - F80-13 (SG-2) Always Below 1 Ω
      C12-1 (SSR+) or F80-8 (LOCK) - Body ground Always 10 kΩ or higher
      C12-2 (SSR-) or F80-13 (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

    A

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    B

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR