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 A/C amplifier via CAN communication.

The A/C amplifier reads the difference between compressor speed and engine speed. When the difference becomes too large, the A/C amplifier determines that the compressor is locked, and turns the magnetic clutch off.

DTC No. DTC Detection Condition Trouble Area
B1422/22 Open or short in compressor lock sensor circuit

  • Air conditioning compressor magnetic clutch circuit

  • A/C compressor (A/C lock sensor)

  • Compressor drive belt

  • Harness or connector between A/C compressor and A/C amplifier

  • A/C amplifier

  • CAN communication system

WIRING DIAGRAM

A019LZSE02

INSPECTION PROCEDURE

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 B

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  2. PERFORM ACTIVE TEST USING INTELLIGENT TESTER


    1. A019MMNE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Magnetic Clutch)

      Disconnect the magnetic clutch connector.

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

      SST
      09843-18040

    3. Connect the intelligent tester to the DLC3.

    4. Start the engine.

    5. Turn the intelligent tester on.

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

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

      Note

      Take care that the connector or measurement tools do not contact the rotating parts of the engine

      Air Conditioner
      Tester Display Test Part Control Range Diagnostic Note
      Magnetic Clutch Relay A/C compressor OFF, ON -
      Standard Voltage
      Tester Connection Condition Specified Condition
      d17 - 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.

    8. Reconnect the magnetic clutch connector.


    NG

    GO TO AIR CONDITIONING COMPRESSOR MAGNETIC CLUTCH CIRCUIT Click here

    OK

  3. INSPECT MAGNETIC CLUTCH


    1. A019JYRE09
      Text in Illustration
      *1

      Component without harness connected

      (Magnetic Clutch)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      d17-1 - Body ground 20°C (68°F) 3.8 to 4.2 Ω

    2. When connector terminal d17-1 is connected to a positive (+) battery terminal, check that the following occurs: 1) the magnetic clutch operating sound can be heard, and 2) the magnetic clutch hub and rotor lock.


    NG

    REPLACE MAGNETIC CLUTCH Click here

    OK

  4. INSPECT A/C COMPRESSOR (A/C LOCK SENSOR)


    1. A019OU5E14
      Text in Illustration
      *1

      Component without harness connected

      (A/C Compressor)

      Disconnect the A/C compressor connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D7-1 (SSR+) - D7-2 (SSR-) 20°C (68°F) 160 to 320 Ω

    NG

    REPLACE A/C COMPRESSOR (A/C LOCK SENSOR) Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - A/C LOCK SENSOR)


    1. A019L63E24

      Disconnect the A/C amplifier connector.

    2. A019JQ1E12
      Text in Illustration
      *1

      Front view of wire harness connector

      (to A/C Amplifier)
      *2

      Front view of wire harness connector

      (to A/C Compressor)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F50-8 (LOCK) - D7-1 (SSR+) Always Below 1 Ω
      F50-13 (SG-2) - D7-2 (SSR-) Always Below 1 Ω
      F50-8 (LOCK) - Body ground Always 10 kΩ or higher
      F50-13 (SG-2) - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      NG A
      OK (When troubleshooting according to Problem Symptoms Table) B
      OK (When troubleshooting according to the DTC) C

    B

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

    C

    REPLACE A/C AMPLIFIER Click here

    A

    REPAIR OR REPLACE HARNESS OR CONNECTOR