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

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DTC Code DTC Name
B1422/22 Compressor Lock Sensor Circuit
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SYSTEM DESCRIPTION

The ECM sends the engine speed signal to the air conditioning amplifier via CAN communication.

The air conditioning amplifier reads the difference between compressor speed and engine speed. When the difference becomes too large, the air conditioning 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

  • Air conditioning compressor (Air conditioning lock sensor)

  • Compressor drive belt

  • Harness or connector between compressor and air conditioning amplifier

  • Air conditioning amplifier

  • CAN communication system
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WIRING DIAGRAM

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INSPECTION PROCEDURE

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PROCEDURE


  1. Click here

    CHECK CAN COMMUNICATION SYSTEM


    1. Use the intelligent tester to check if the CAN communication system is functioning normally.

      OK
      CAN DTC is not output.

  2. Click here

    INSPECT AIR CONDITIONING AMPLIFIER


    1. A017BACE42

      Remove the air conditioning amplifier with the connectors still connected.

    2. A017BPPE03

      Measure the waveform of the connector.

      Item Contents
      Tool setting 200 mV/DIV., 10 ms./DIV.
      Vehicle condition

      Engine is running

      A/C switch: ON

      Blower switch: LO
      Standard
      Tester Connection Condition Specified Condition
      D33-8 (LOCK) - D33-13 (SG-2)

      Engine is running

      A/C switch: ON

      Blower switch: LO

      		 Pulse generation
      Result
      Result Proceed to
      NG A
      OK (When troubleshooting according to PROBLEM SYMPTOMS TABLE) B
      OK (When troubleshooting according to DTC) C

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    INSPECT COMPRESSOR AND MAGNETIC CLUTCH (AIR CONDITIONING LOCK SENSOR)


    1. A017FN5E06

      Disconnect the connector from the air conditioning compressor.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      B44-2 (SSR+) - B44-5 (SSR-) 20°C (68°F) 160 to 320 Ω

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    CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - AIR CONDITIONING LOCK SENSOR)


    1. A017BP9E88

      Disconnect the connector from the air conditioning amplifier.

    2. A017B10E06

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

      Standard resistance
      Tester Connection Condition Specified Condition
      D33-8 (LOCK) - B44-2 (SSR+) Always Below 1 Ω
      D33-13 (SG-2) - B44-5 (SSR-) Always Below 1 Ω
      D33-8 (LOCK) - Body ground Always 10 kΩ or higher
      D33-13 (SG-2) - Body ground Always 10 kΩ or higher

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    GO TO CAN COMMUNICATION SYSTEMClick here

  6. Click here

    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLEClick here

  7. Click here

    REPLACE AIR CONDITIONING AMPLIFIERClick here

  8. Click here

    REPLACE COMPRESSOR AND MAGNETIC CLUTCH (AIR CONDITIONING LOCK SENSOR)Click here

  9. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR