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

  • 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

A01CE4HE02

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


    1. A01CCWXE04

      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
      D40-1 (SSR+) - D40-2 (SSR-) 20°C (68°F) 160 to 320 Ω

    NG

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

    OK

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


    1. A01CFVOE16

      Disconnect the A/C amplifier connector.

    2. A01CDGWE09

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G33-8 (LOCK) - D40-1 (SSR+) Always Below 1 Ω
      G33-13 (SG-2) - D40-2 (SSR-) Always Below 1 Ω
      G33-8 (LOCK) - Body ground Always 10 kΩ or higher
      G33-13 (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