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Home >> Lexus >> 2004 >> GX 470 >> Repair and Diagnosis >> Suspension >> Electronic Suspension >> Electronic Modulated Suspension & Rear Air Suspension System - Diagnosis >> DTC C1742/42: Height Control Compressor Circuit >> Inspection Procedure

Inspection Procedure

  1. RECONFIRM DTC 
    1. Check if the other DTC are recorded ( PRE-CHECK ).
    1. YES: REPAIR CIRCUIT INDICATED BY OUTPUT CODE 
    2. NO: GO TO NEXT STEP. 
  2. INSPECT HEIGHT CONTROL COMPRESSOR ASSY 
    1. Disconnect the height control compressor assy connector.
    2. Apply battery voltage between terminal 1 and 2 of the height control compressor assy.
      Fig 1: Applying Battery Voltage Between Terminal 1 And 2 Of Height Control Compressor Assy
      G01421617Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Standard: Compressor motor operates. 

    NOTE:
    • Do not operate the height control compressor assy 90 sec. or more.
    • Since short and lock inside the height control compressor assy causes enormous current to flow, stop the operation immediately when it dose not rotate.
    1. NG: REPLACE HEIGHT CONTROL COMPRESSOR ASSY 
    2. OK: GO TO NEXT STEP. 
  3. CHECK HARNESS AND CONNECTOR (HEIGHT CONTROL COMPRESSOR ASSY - SUSPENSION CONTROL ECU) 
    1. Check for open and short circuit in the harness and the connector between the height control compressor assy and the suspension control ECU (See ELECTRONIC CIRCUIT INSPECTION PROCEDURE ).
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. OK: GO TO NEXT STEP. 
  4. CHECK HARNESS AND CONNECTOR (HEIGHT CONTROL COMPRESSOR ASSY - AIR SUS RELAY) 
    1. Check for open and short circuit in the harness and the connector between the height control compressor assy and the AIR SUS relay (See ELECTRONIC CIRCUIT INSPECTION PROCEDURE ).
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. OK: GO TO NEXT STEP. 
  5. INSPECT HEIGHT CONTROL SOLENOID VALVE OR EXHAUST SOLENOID VALVE 

    When using hand-held tester: 

    1. Connect the hand-held tester to DLC3.
    2. Turn the ignition switch ON, and push the hand-held tester main switch ON.
    3. Select the item "LEVEL SOL REAR", "GATE SOL REAR", "LOW PRS TNK SOL" in the ACTIVE TEST, and operate it with the hand-held tester.

      HINT:

      The exhaust solenoid valve cannot be tested in ACTIVE TEST.

    4. Check whether the solenoid makes sound.
    5. Check whether the height control solenoid valve has a continuity (will vibrate).

    Standard: The solenoid makes sound, the height control solenoid valve has a continuity (will vibrate). 

    When not using hand-held tester: 

    1. Disconnect the valve connector.
    2. Check the operating sound of the valves when battery positive voltage is applied to the terminals as shown below.
      Fig 2: Solenoid Valve Specification
      G01421618Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 3: Inspecting Height Control Solenoid Valve Or Exhaust Solenoid Valve
      G01421619Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Standard: It should make an operating sound (click). 

    HINT:

    • When a malfunction is found in the gate solenoid valve, the leveling valve or the tank solenoid valve, replace the height control reservoir assy.
    • When a malfunction is found in the exhaust solenoid valve, replace the height control compressor assy.
    1. NG: REPLACE HEIGHT CONTROL RESERVOIR ASSY 
    2. NG: REPLACE HEIGHT CONTROL COMPRESSOR ASSY 
    3. OK: GO TO NEXT STEP. 
  6. INSPECT FOR AIR TUBE CLOGGED 
    1. Check visually for clog, damage or breakage on the air tube (See SUSPENSION CONTROL SYSTEM ).
    1. NG: REPAIR OR REPLACE AIR TUBE 
    2. OK: GO TO NEXT STEP. 

      CHECK AND REPLACE SUSPENSION CONTROL ECU (See  ELECTRONIC CIRCUIT INSPECTION PROCEDURE  ) 

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