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

DTC Code DTC Name
B1422/22 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 magnet clutch off.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

Note

B1422/22

Compressor Lock Sensor Circuit

Open or short in A/C lock sensor circuit

  • Cooler compressor assembly (A/C lock sensor)

  • Harness or connector

  • Air conditioning amplifier assembly

  • CAN communication system

-

w/ Magnet Clutch
Tip:

The air conditioning amplifier assembly stores the DTC of the respective malfunction if it has occurred for the period of time indicated in the brackets.

WIRING DIAGRAM

E226603E07

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. E127549N02

      Remove the cooler compressor assembly.

      Click here

    2. 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

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

    1. Disconnect the G81 air conditioning amplifier assembly connector.

    2. Disconnect the B68 cooler compressor assembly (A/C lock sensor) connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      G81-8 (LOCK) - B68-1 (SSR+)

      Always

      Below 1 Ω

      G81-13 (SG-2) - B68-2 (SSR-)

      Always

      Below 1 Ω

      G81-8 (LOCK) - Body ground

      Always

      10 kΩ or higher

      G81-13 (SG-2) - Body ground

      Always

      10 kΩ or higher

    Result

    Result

    Proceed to

    OK (When troubleshooting according to the DTC)

    A

    OK (When troubleshooting according to Problem Symptoms Table)

    B

    NG

    C
    A

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

    Click here

    B

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

    Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR