AIR CONDITIONING SYSTEM (for Automatic 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 compressor is locked, and turns the magnetic clutch off.

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

  • Cooler compressor assembly (A/C lock sensor)

  • Compressor drive belt

  • Harness or connector between cooler compressor assembly (A/C lock sensor) and air conditioning amplifier assembly

  • Air conditioning amplifier assembly

  • CAN communication system

WIRING DIAGRAM

A011UQWE01

INSPECTION PROCEDURE

PROCEDURE

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

    1. Disconnect the E73 cooler compressor assembly (A/C lock sensor) connector.

      A011T52E40

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E73-1 (SSR+) - E73-2 (SSR-) 20°C (68°F) 160 to 320 Ω
      Text in Illustration
      *a

      Component without harness connected

      (Cooler Compressor Assembly (A/C Lock Sensor))
    NG

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

    OK

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

    1. Disconnect the I77 air conditioning amplifier assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I77-8 (LOCK) - E73-1 (SSR+) Always Below 1 Ω
      I77-13 (SG-2) - E73-2 (SSR-) Always Below 1 Ω
      I77-8 (LOCK) - Body ground Always 10 kΩ or higher
      I77-13 (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 AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    A

    REPAIR OR REPLACE HARNESS OR CONNECTOR