AIR SUSPENSION SYSTEM HOW TO PROCEED WITH TROUBLESHOOTING

Tech Tips

Use these procedures to troubleshoot the air suspension system.

*: Use the intelligent tester.


  1. VEHICLE BROUGHT TO WORKSHOP


    NEXT

  2. PROBLEM SYMPTOM CONFIRMATION


    NEXT

  3. INSPECT AUXILIARY BATTERY VOLTAGE

    Standard voltage
    11 to 14 V

    If the voltage is below 11 V, recharge or replace the auxiliary battery before proceeding.


    NEXT

  4. CHECK ECUS CONNECTED TO CAN BUS*


    1. Check ECUs connected to CAN bus for LHD Click here or for RHD Click here.

      Result
      Result Proceed to
      Malfunction appears A
      No malfunction appears (for LHD) B
      No malfunction appears (for RHD) C

      B

      Go to CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here

      C

      Go to CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here

      A

  5. CHECK DTC (CAN AND LIN COMMUNICATION SYSTEM)*


    1. Check for all DTCs.

      Result
      Result Proceed to
      DTC is not output A
      CAN system DTC is output (for LHD) B
      CAN system DTC is output (for RHD) C
      LIN system DTC is output D
      Air suspension DTC is output E

      B

      Go to CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here

      C

      Go to CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here

      D

      Go to LIN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here

      E

      Go to DIAGNOSTIC TROUBLE CODE CHART Click here

      A

  6. PROBLEM SYMPTOM TABLE

    Result
    Result Proceed to
    Fault is not listed in problem symptoms table A
    Fault is listed in problem symptoms table B

    B

    Go to step 8
    A

  7. OVERALL ANALYSIS AND TROUBLESHOOTING*


    1. DATA LIST / ACTIVE TEST Click here

    2. Terminals of ECU Click here


      NEXT

  8. REPAIR OR REPLACE


    NEXT

  9. CONFIRMATION TEST


    NEXT
    END