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Home › Toyota › 2004 › Matrix Base, 4WD › Repair and Diagnosis › External Pages › Different car › Section 557 (Air Conditioning System - Diagnostics) › Circuit Inspection › DTC 22: Compressor Lock Sensor Circuit › Inspection Procedure

Inspection Procedure

WARNING: This page is about a different car, the 2003 Toyota Sequoia. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check compressor. 

    PREPARATION:

    1. Check compressor drive belt tension (See ON-VEHICLE INSPECTION )
    2. Check if the compressor does not lock during operation with engine started and blower switch and A/C switch ON.
    1. NG : Adjust drive belt tension or repair compressor. 
    2. OK : Go To Next Step. 
  2. Check compressor lock sensor. 

    PREPARATION:

    Disconnect compressor connector.

    CHECK:

    Measure resistance between terminals 1 and 2 of compressor lock sensor connector.

    Fig 1: Measuring Resistance Between Terminals 1 And 2 Of Compressor Lock Sensor Connector
    G02839065Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK:

    1. Resistance: 165 - 205 Ω at 20°C (68°F) 

    Reference: Inspection using oscilloscope 

    During cranking or idling, measure voltage between terminals LOCK and SG-1 of integration control and panel.

    NOTE: The correct waveform appears as shown in the illustration below.
    Fig 2: Identifying LOCK IN Signal Waveform
    G02839066Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG : Replace compressor. 
    2. OK : Go To Next Step. 
  3. Check harness and connector between compressor lock sensor and ECM (See  HOW TO PROCEED WITH TROUBLESHOOTING  ). 
    1. NG : Repair or replace harness or connector. 
    2. OK : Go To Next Step. 
  4. Check harness and connector between ECM and integration control and panel (See  HOW TO PROCEED WITH TROUBLESHOOTING  ). 
    1. NG : Repair or replace harness or connector. 
    2. OK : Go To Next Step. 
  5. Check voltage between terminals ACLD of ECM and body ground. 

    PREPARATION:

    Remove ECM with connectors still connected.

    CHECK:

    1. Turn ignition switch to ON.
    2. A/C switch ON.
    3. Measure voltage between terminals ACLD of ECM and body ground.
      4. Fig 3: Measuring Voltage Between Terminals ACLD Of ECM And Body Ground
      G02839067Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK:

    1. Voltage: Below 1.0 V 
    1. NG : Check and replace ECM. 
    2. OK : Check and replace integration control and panel. 
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