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

Tech Tips

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

A01QQ9DE07
*a LOCK
*b Cooler Compressor Assembly (A/C Lock Sensor)
*c Air Conditioning Amplifier Assembly
*d CAN Communication Line

CAUTION / NOTICE / HINT

Note

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

Tech Tips

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. A01QRQ1N02

      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