VEHICLE STABILITY CONTROL SYSTEM DIAGNOSIS SYSTEM


  1. DESCRIPTION

    When troubleshooting a vehicle with the diagnosis system, the only difference from the usual troubleshooting procedure is connecting the intelligent tester to the vehicle and reading various data output from the vehicle's skid control ECU.

    The skid control ECU records DTCs when the computer detects a malfunction in the computer itself or in its circuits.

    To check the DTCs, connect the intelligent tester to the DLC3 on the vehicle. The intelligent tester can clear the DTCs, activate the various actuators, and check the Freeze Frame Data and Data List.


    1. Check the battery voltage.

      If the voltage is below 11 V, recharge the battery before proceeding to the next step.

    2. Check the DLC3 Click here.

    3. DIAGNOSIS


      1. A01CFJ7E01

        If the skid control ECU detects a malfunction, the ABS warning light, brake warning light and SLIP indicator light will come on in order to warn the driver.

      2. The DTCs are simultaneously stored in the memory. The DTCs can be read by connecting SST between terminals TC and CG of the DLC3 and observing the blinking pattern of the ABS warning light and SLIP indicator light, or by connecting the intelligent tester.

      3. This system has a Test Mode (signal check) function Click here. The DTC can be read by connecting the intelligent tester and observing the blinking pattern of the ABS warning light.

    4. WARNING LIGHT AND INDICATOR LIGHT INITIAL CHECK


      1. A01CFJ7E01

        Release the parking brake.

        Note

        When releasing the parking brake, move the shift lever to P.

        Tech Tips

        When the parking brake is applied or the level of the brake fluid is low, the brake warning light comes on.

      2. When the engine switch is turned on (IG), check that the ABS warning light, brake warning light and SLIP indicator light come on for approximately 3 seconds.

        Tech Tips

        If the warning light and indicator light check result is not normal, proceed to troubleshooting for the ABS warning, brake warning and SLIP indicator light circuits.

        If the indicator remains on or does not come on, proceed to troubleshooting for the light circuits listed below.

      5. Trouble Area See Procedure
      ABS warning light circuit (Remains on)

      Click here

      ABS warning light circuit (Does not come on)

      Click here

      Brake warning light circuit (Remains on)

      Click here

      Brake warning light circuit (Does not come on)

      Click here

      SLIP indicator light circuit (Remains on)

      Click here

      SLIP indicator light circuit (Does not come on)

      Click here

  • SYMPTOM SIMULATION

    Tech Tips

    The most difficult case in troubleshooting is when no symptoms occur. In such cases, a thorough customer problem analysis must be carried out. Then the same or similar conditions and environment in which the problem occurred in the customer's vehicle should be reproduced. No matter how experienced or skilled a technician may be, if he/she proceeds to troubleshoot without confirming the problem symptoms, he/she will likely overlook something important and make a wrong guess at some points in the repair operation. This leads to a standstill in troubleshooting.


    1. A01CC7SE01

      Vibration method: When vibration seems to be the major cause.

      Tech Tips

      Perform the simulation method only during the primary check period (for approximately 6 seconds after the engine switch is turned on (IG)).


      1. Slightly vibrate the part of the sensor considered to be the problem cause with your fingers and check whether the malfunction occurs.

      2. Slightly shake the connector vertically and horizontally.

        Tech Tips

        Shaking the relays too strongly may result in open relays.

      3. Slightly shake the wire harness vertically and horizontally. The connector joint and fulcrum of the vibration are the major areas to be checked thoroughly.