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Home >> Lexus >> 2006 >> RX 330 AWD >> Repair and Diagnosis >> Suspension >> Suspension Control Systems >> Suspension Control >> Air Suspension System >> DTC C1742/42 Height Control Compressor Circuit >> Inspection Procedure

Inspection Procedure

  1. RECONFIRM DTC 
    1. Check if DTC C1741/41 is output (See DTC C1741/41 AIR SUSPENSION RELAY CIRCUIT  ).

      OK: 

      DTC C1741/41 is output. 

    DIAGNOSTIC TROUBLE CODE CHART

    DTC C1741/41 is output. A
    Other DTC is output B

    NG: REPAIR CIRCUIT INDICATED BY OUTPUT CODE 

    OK: Go to next step 

  2. INSPECT HEIGHT CONTROL COMPRESSOR 
    1. Disconnect the height control compressor motor connector.
    2. Check the operating sound of the compressor motor when battery positive voltage is applied to the terminals.
      BATTERY SPECIFICATION

      Battery Positive Battery Negative
      1 (B) 2 (L)
      Fig 1: Inspecting Height Control Compressor
      G04090187Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: 

      Compressor motor operates. 

      NOTE:
      • Do not operate the height control compressor assembly 60 seconds. or more.
      • Since a short and a lock-up inside the height control compressor assembly causes enormous current to flow, stop operation immediately when it does not rotate.

      HINT:

      When a malfunction is found in the height control compressor motor, replace the height control compressor assembly.

    NG: REPLACE CONTROL COMPRESSOR ASSEMBLY 

    OK: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (SUSPENSION CONTROL ECU - HEIGHT CONTROL COMPRESSOR MOTOR) 
    1. Connect the height control compressor motor connector.
    2. Disconnect the suspension control ECU S14 connector.
    3. Measure the resistance according to the values in the table below.

    Resistance 

    Fig 2: Disconnecting Suspension Control ECU S14 Connector
    G04090188Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TESTER CONNECTION SPECIFIED CONDITION

    Tester Connection Specified Condition
    S14-25 (RM+) - S14-26 (RM-) 6.4 to 7.4 Ω

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  4. CHECK HARNESS AND CONNECTOR (HEIGHT CONTROL COMPRESSOR MOTOR - BODY GROUND) 
    1. Measure the resistance according to the values in the table below.

    Resistance 

    Fig 3: Identifying Height Control Compressor Motor - Body Ground
    G04090189Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TESTER CONNECTION SPECIFIED CONDITION

    Tester Connection Specified Condition
    2 (L) - Body ground Below 1 Ω

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  5. CHECK HARNESS AND CONNECTOR (HEIGHT CONTROL COMPRESSOR MOTOR - AIR SUS RELAY) 
    1. Disconnect the AIR SUS relay from the engine room R/ B.
    2. Measure the resistance according to the values in the table below.

    Resistance 

    Fig 4: Disconnecting Air Sus Relay From Engine Room R/ B
    G04090190Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TESTER CONNECTION SPECIFIED CONDITION

    Tester Connection Specified Condition
    1 (B) - 3 (for AIR SUS relay) Below 1 Ω
    1 (B) - Body ground 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  6. CHECK HARNESS AND CONNECTOR (AIR SUS RELAY - AIR SUS FUSE) 
    1. Measure the voltage according to the values in the table below.

    Voltage 

    TESTER CONNECTION SPECIFIED CONDITION

    Tester Connection Specified Condition
    5 (for AIR SUS relay) - Body ground 11 to 14 V

    Result 

    RESULT SPECIFICATION

    Result Proceed to
    OK A (When using intelligent tester)
    (Referece) B (When not using intelligent tester)
    NG C
    Fig 5: Identifying Engine Room R/B Side
    G04090191Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    B: Go to step   8 

    C: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    A: Go to next step 

  7. INSPECT HEIGHT CONTROL SOLENOID VALVE 
    1. Connect the intelligent tester to the DLC3.
    2. Turn the ignition switch to the ON position, and push the intelligent tester main switch on.
    3. Select the item below in the ACTIVE TEST, and operate it with the intelligent tester.

      AIRSUS 

      ACTIVE TEST ITEM CHART

      Item Vehicle Condition / Test Details Diagnostic Note
      FR SOL Turn OFF right front solenoid valve one second after turning it ON Operation of solenoid (clicking sound) can be heard
      FL SOL Turn OFF left front solenoid valve one second after turning it ON Operation of solenoid (clicking sound) can be heard
      RR SOL Turn OFF right rear solenoid valve one second after turning it ON Operation of solenoid (clicking sound) can be heard
      RL SOL Turn OFF left rear solenoid valve one second after turning it ON Operation of solenoid (clicking sound) can be heard
    4. Check whether the height control solenoid valve has a continuity (will vibrate).

      OK: 

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

    OK: Go to step   9 

    NG: Go to next step 

  8. INSPECT HEIGHT CONTROL SOLENOID VALVE 
    1. HEIGHT CONTROL SOLENOID VALVE FRONT RH:
      1. Disconnect the height control solenoid valve connector.
      2. Check the operating sound of the height control solenoid valve when positive battery voltage is applied to the terminals.
        BATTERY SPECIFICATION

        Tester Connection
        Battery Positive Battery Negative
        3 (RH+) 2 (E)

        OK: 

        It should make an operating sound (click). 

        Result 

        RESULT SPECIFICATION

        Result Proceed to
        OK A
        NG B
        Fig 6: Identifying Height Control Solenoid Valve Front
        G04090192Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        HINT:

        When a malfunction is found in the front solenoid valve, replace the height control valve subassembly No. 1.

    2. HEIGHT CONTROL SOLENOID VALVE FRONT LH:
      1. Disconnect the height control solenoid valve connector.
      2. Check the operating sound of the height control solenoid valve when positive battery voltage is applied to the terminals.
        BATTERY SPECIFICATION

        Battery Positive Battery Negative
        1 (LH+) 2 (E)

        OK: 

        It should make an operating sound (click). 

        Result 

        RESULT SPECIFICATION

        Result Proceed to
        OK A
        NG B
        Fig 7: Identifying Height Control Solenoid Valve Front LH
        G04090193Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        HINT:

        When a malfunction is found in the front solenoid valve, replace the height control valve subassembly No. 1.

    3. HEIGHT CONTROL SOLENOID VALVE REAR RH:
      1. Disconnect the height control solenoid valve connector.
      2. Check the operating sound of the height control solenoid valve when positive battery voltage is applied to the terminals.
        BATTERY SPECIFICATION

        Battery Positive Battery Negative
        1 (RH+) 2 (E)

        OK: 

        It should make an operating sound (click). 

        Result 

        RESULT SPECIFICATION

        Result Proceed to
        OK A
        NG C
        Fig 8: Identifying Height Control Solenoid Valve Rear
        G04090194Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        HINT:

        When a malfunction is found in the rear solenoid valve, replace the height control valve subassembly No. 2.

    4. HEIGHT CONTROL SOLENOID VALVE REAR LH:
      1. Disconnect the height control solenoid valve connector.
      2. Check the operating sound of the height control solenoid valve when positive battery voltage is applied to the terminals.
        BATTERY SPECIFICATION

        Battery Positive Battery Negative
        3 (LH+) 2 (E)

        OK: 

        It should make an operating sound (click). 

        Result 

        RESULT SPECIFICATION

        Result Proceed to
        OK A
        NG C
        Fig 9: Identifying Height Solenoid Valve Rear LH Connector
        G04090195Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        HINT:

        When a malfunction is found in the rear solenoid valve, replace the height control valve subassembly No. 2.

    B: REPLACE HEIGHT CONTROL VALVE SUBASSEMBLY NO. 1 

    C: REPLACE HEIGHT CONTROL VALVE SUBASSEMBLY NO. 2 

    A: Go to next step 

  9. INSPECT EXHAUST SOLENOID VALVE 
    1. Disconnect the exhaust solenoid valve connector.
    2. Check the operating sound of the exhaust solenoid valve when positive battery voltage is applied to the terminals.
      BATTERY SPECIFICATION

      Battery Positive Battery Negative
      1 (SLEX) 2 (GND)

      OK: 

      It should make an operating sound (click). 

      HINT:

      When a malfunction is found in the exhaust solenoid valve, replace the height control compressor assembly.

    Result 

    RESULT SPECIFICATION

    Result Proceed to
    OK A (When using intelligent tester)
    (Referece) B (When not using intelligent tester)
    NG C
    Fig 10: Identifying Exhaust Solenoid Valve Connector
    G04090196Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    B: Go to step   11 

    C: REPLACE HEIGHT CONTROL COMPRESSOR ASSEMBLY 

    A: Go to next step 

  10. INSPECT TANK SOLENOID VALVE 
    1. Connect the intelligent tester to the DLC3.
    2. Turn the ignition switch to the ON position, and push the intelligent tester main switch on.
    3. Select the item below in the ACTIVE TEST, and operate it with the intelligent tester.

      AIRSUS 

      ACTIVE TEST ITEM CHART

      Item Vehicle Condition / Test Details Diagnostic Note
      LOW PRS TNK SOL Turn tank solenoid valve / ON or OFF Operation of solenoid (clicking sound) can be heard
    4. Check whether the tank solenoid valve has a continuity (will vibrate).

      OK: 

      The solenoid makes sound, and the tank solenoid valve has a continuity (will vibrate). 

    OK: Go to step   12 

    NG: REPLACE PNEUMATIC W/TUBE TANK ASSEMBLY 

  11. INSPECT TANK SOLENOID VALVE 
    1. Disconnect the exhaust solenoid valve connector.
    2. Check the operating sound of the tank solenoid valve when positive battery voltage is applied to the terminals.
      Fig 11: Identifying Tank Solenoid Valve Connector
      G04090197Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      BATTERY SPECIFICATION

      Battery Positive Battery Negative
      1 (SLLO) 2 (GND)

      OK: 

      The solenoid makes sound, and the tank solenoid valve has a continuity (will vibrate). 

      HINT:

      When a malfunction is found in the tank solenoid valve, replace the pneumatic tank assembly.

    NG: REPLACE PNEUMATIC W/TUBE TANK ASSEMBLY 

    OK: Go to next step 

  12. INSPECT FOR CLOGGED AIR TUBE 
    1. Check visually for a clog, damage or breakage on the air tube (See ON-VEHICLE INSPECTION  ).

    NG: REPAIR OR REPLACE AIR TUBE 

    OK: REPLACE SUSPENSION CONTROL ECU 

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