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DTC C1747/47: Leveling Solenoid Valve Circuit: Procedure

  1. PERFORM ACTIVE TEST USING TECHSTREAM (REAR LEVELING SOLENOID) 
    1. Turn the engine switch off.
    2. Connect the Techstream to the DLC3.
    3. Turn the engine switch on (IG).
    4. Turn the Techstream on.
    5. Enter the following menus: Chassis / Air suspension / Active Test.
      AIR SUSPENSION

      Tester Display Test Part Control Range Diagnostic Note
      Rear Leveling Solenoid Leveling solenoid valve ON or OFF
      • The operating sound of the solenoid (clicking sound) can be heard.
      • When the Active Test is performed, Rear Leveling Solenoid in the Data List changes between ON and OFF accordingly.

      OK

      Operation of solenoid (clicking sound) can be heard.

      RESULT

      Result Proceed to
      NG A
      OK (When troubleshooting according to problem symptoms table) B
      OK (When troubleshooting according to the DTC chart) C

    C → See step   5 

    B → See step   4 

    A: Go to next step 

  2. CHECK HARNESS AND CONNECTOR (LEVELING SOLENOID VALVE - SUSPENSION CONTROL ECU AND BODY GROUND) 
    1. Disconnect the S6 leveling solenoid valve connector.
    2. Disconnect the A11 suspension control ECU connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      S6-3 (RH+) - A11-16 (SLRR) Always Below 1 Ω
      S6-3 (RH+) - Body ground Always 10 kΩ or higher
      S6-2 (E) - Body ground Always Below 1 Ω

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  3. INSPECT NO. 2 HEIGHT CONTROL VALVE (LEVELING SOLENOID VALVE) 
    1. Turn the engine switch off.
    2. Remove the No. 2 height control valve. Refer to REMOVAL .
    3. Measure the resistance according to the value(s) in the table below.
      Fig 1: Identifying No. 2 Height Control Valve Connector Terminals
      GTY259892Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition
      2 (E) - 3 (RH+) 20 °C (68 °F) 10 to 14 Ω
      TEXT IN ILLUSTRATION

      *a Component without harness connected
      (No. 2 Height Control Valve)
    4. Connect the positive (+) lead of the battery to terminal 3 (RH+) and the negative (-) lead to terminal 2 (E) of the solenoid valve connector. Then check that the valve makes an operating sound.

      OK

      Operation of solenoid (clicking sound) can be heard.

    NG → See step   6 

    OK → See step   7 

  4. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE 
  5. USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING 
  6. REPLACE NO. 2 HEIGHT CONTROL VALVE ASSEMBLY. Refer to  REMOVAL 
  7. REPLACE SUSPENSION CONTROL ECU. Refer to  REMOVAL 
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