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 No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

Note

B1422/22

Compressor Lock Sensor Circuit

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

E193114E20

CAUTION / NOTICE / HINT

Note:

Before performing the inspection, check that there are no problems related to the CAN communication system.

Tip:

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

PROCEDURE

  1. INSPECT COOLER COMPRESSOR ASSEMBLY (A/C LOCK SENSOR)

    1. E193115

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

      Click here

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      1 - 2

      20°C (68°F)

      160 to 320 Ω

    Result

    Result

    OK

    NG
    NG

    REPLACE COOLER COMPRESSOR ASSEMBLY (A/C LOCK SENSOR)

    Click here

    OK

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

    1. Disconnect the G13 amplifier connector.

    2. Disconnect the C32 sensor connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      G13-8 (LOCK) - C32-1 (SSR+)

      Always

      Below 1 Ω

      G13-13 (SG-2) - C32-2 (SSR-)

      Always

      Below 1 Ω

      G13-8 (LOCK) - Body ground

      Always

      10 kΩ or higher

      G13-13 (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