ELECTRONICALLY CONTROLLED BRAKE 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 it detects a malfunction in the ECU itself or in its circuits.

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


    1. Check the auxiliary battery voltage.

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

    2. Check the DLC3 Click here.

    3. DIAGNOSIS


      1. A01NDGDE01

        If the skid control ECU detects a malfunction, the ABS warning, brake warning / red (malfunction), brake warning / yellow (minor malfunction) and slip indicator lights 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, brake warning / yellow (minor malfunction) and slip indicator lights, or by connecting the intelligent tester Click here.

      3. This system has a Test Mode (signal check) function.

        The DTCs can be read by connecting SST between terminals TS and CG of the DLC3 and observing the blinking pattern of the ABS warning, brake warning / yellow (minor malfunction) and slip indicator lights, or by connecting the intelligent tester Click here.

    4. WARNING LIGHT AND INDICATOR LIGHT INITIAL CHECK


      1. Release the parking brake.

        Note

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

        Tech Tips

        When the parking brake is applied or the brake fluid level is low, the brake warning light / red (malfunction) comes on.

      2. A01NFXAE01

        When the power switch is turned on (IG), check that the VSC OFF indicator light comes on for approximately 3 seconds, and ABS warning, brake warning / red (malfunction), brake warning / yellow (minor malfunction) and slip indicator lights remain on until the power switch is turned on (READY).

        Tech Tips


        • If the warning light and indicator light check result is not normal, proceed to troubleshooting for the ABS warning, brake warning / red (malfunction), brake warning / yellow (minor malfunction), VSC OFF indicator 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 / red (malfunction) circuit (Remains on)

      Click here

      Brake warning light / red (malfunction) circuit (Does not come on)

      Click here

      Brake warning light / yellow (minor malfunction) circuit (Remains on)

      Click here

      Brake warning light / yellow (minor malfunction) circuit (Does not come on)

      Click here

      VSC OFF indicator light circuit (Remains on)

      Click here

      VSC OFF indicator 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