ELECTRONICALLY CONTROLLED BRAKE SYSTEM > DIAGNOSIS SYSTEM

for Preparation Click here



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.

    Standard Voltage:
    11 to 14 V

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

  2. Check the DLC3 (Click here).


DIAGNOSIS

  1. 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).


WARNING LIGHT AND INDICATOR LIGHT INITIAL CHECK

  1. Release the parking brake.

    NOTICE:
    When releasing the parking brake, push the P position switch (transmission shift main switch) for safety.

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

  2. When the power switch is turned on (IG), check that the ABS warning, brake warning / red (malfunction), brake warning / yellow (minor malfunction) and slip indicator lights come on until the power switch is turned on (READY).

    HINT:
    1. 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) and slip indicator light circuits.
    2. If the indicator remains on or does not come on, proceed to troubleshooting for the light circuits listed below.

    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
    Slip indicator light circuit (Remains on)
    		 Click here
    Slip indicator light circuit (Does not come on)
    		 Click here