Anti-Lock Brake System

General Information

ABS Sequence Control

1. 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.
2. ABS sequence control can be started by diagnosis connector or select monitor. ABS SEQUENCE CONTROL WITH DIAGNOSIS CONNECTOR
   • Connect diagnosis terminals to terminals No. 5 and No. 8 of the diagnosis connector beside driver's seat heater unit.
   • Set the speed of all wheels at 2.75 km/h (2 MPH) or less.
   • Turn ignition switch OFF.
   • Within 0.5 seconds after the ABS warning light goes out, depress the brake pedal and hold it immediately after ignition switch is turned to ON.

   CAUTION
   Do not depress the clutch pedal.

   NOTE: When the ignition switch is set to on, the brake pedal must not be depressed. Engine must not operate.

3. After completion of ABS sequence control, turn ignition switch OFF. ABS SEQUENCE CONTROL WITH SELECT MONITOR

   NOTE: In the event of any trouble, the sequence control may not be operative. In such a case, activate the sequence control, referring to "ABS SEQUENCE CONTROL WITH DIAGNOSIS CONNECTOR". When the diagnosis terminal is connected to the diagnosis connector, the sequence control will not operate.

   • Connect select monitor to data link connector under driver's seat instrument panel lower cover.
   • Turn ignition switch ON.
   • Turn select monitor switch ON.
   • Put select monitor to "BRAKE CONTROL" mode.
   • When "Function check sequence" is selected, ABS sequence control will start.
   • The message Press Brake Pedal Firmly' is displayed as follows:
     1. When using the brake tester, depress brake pedal with braking force of 981 N (100 kgf, 221 lb) .
     2. When using the pressure gauge, depress brake pedal so as to make the pressure gauge indicate 3,432 kPa (35 kg/cm2, 498 psi).

     CAUTION
     Do not depress the clutch pedal.

     • When the message "Press YES" is displayed, press "YES" key.
     • Operation points will be displayed on select monitor.

   Conditions for ABS Sequence Control

   NOTE: When select monitor is used, control operation starts at point A. The patterns from IGN key ON to the point A show that operation is started by diagnosis connector. 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 terminal No. 5 or No. 8 are separated from diagnosis terminals. (When select monitor is not used.)
   • When the brake pedal is released during sequence control and the braking lamp switch is set to off.
   • When brake pedal is depressed after ignition key is turned to ON, and before ABS warning light goes out. (When select monitor is not used.)
   • When brake pedal is not depressed after ignition key is turned to ON, and within 0.5 seconds after ABS warning light goes out. (When select monitor is not used.)
   • After completion of the sequence control.
   • When malfunction is detected. (When select monitor is used.)