Antilock Brakes / Traction Control Systems: Description and Operation
ABS Sequence ControlOPERATION
Under the ABS sequence control, after the hydraulic unit solenoid valve is driven, the operation of the hydraulic unit can be checked by means of the brake tester or pressure gauge.
ABS sequence control can be started by Vehicle Diagnostic Interface.
ABS SEQUENCE CONTROL WITH Vehicle Diagnostic Interface
Note: In the event of any trouble, the sequence control may not be operative. In such a case, perform the diagnosis.
Connect the Vehicle Diagnostic Interface to data link connector under driver's seat instrument panel lower cover.
Turn the ignition switch to ON.
Start the Vehicle Diagnostic Interface.
Put the Vehicle Diagnostic Interface to "BRAKE CONTROL" mode.
When "Function check sequence" is selected, 'ABS sequence control' will start.
When the message "Press Brake Pedal with braking force of 100 to 150 kgf" is displayed, perform the followings.
When using the brake tester, depress the brake pedal with braking force of 981 N (100 kgf, 221 lbs.).
When using the pressure gauge, depress the brake pedal so as to make the pressure gauge indicate 3,432 kPa (35 kg/cm 2, 498 psi).
When the message "Press YES" is displayed, press the YES key.
The braking system in operation is displayed on Vehicle Diagnostic Interface.
CONDITIONS FOR ABS SEQUENCE CONTROL
Note:
^ When the Vehicle Diagnostic Interface is used, control operation starts at point A. (However, the stop light switch must be ON before point A.)
^ HIGH means high voltage.
^ LOW means low voltage.
SPECIFICATION
CONDITIONS FOR COMPLETION OF ABS SEQUENCE CONTROL
When the following conditions develop, the ABS sequence control stops and ABS operation is returned to the normal control mode.
When the speed of at least one wheel reaches 10 km/h (6 MPH).
When the brake pedal is released during sequence control and the stop light switch is set to off.
After completion of the sequence control.
When malfunction is detected.