Hydraulic control unit (equipping with ABS)
Inspection on automobile...............................
- Connect handle tester
(a) Connect handle tester to DLC3.
(b) Start the engine and make it run at idling speed.
(c) Handle tester should choose “Active test” module.
Hint: details could refer to operating instruction for handle tester. - Check the function of hydraulic.
(a) Start the motor relay, and check hydraulic motor should have working sound.
(b) Stop the motor relay.
(c) Step brake pedal for 15 minutes, and check brake pedal should not be stepped down.
(d) Start the motor relay, and check brake pedal should not have any pulse.
Note: Time when motor relay locates ON could not exceed 5 seconds, when it is necessary to
operate continually, interval time should be over 20 seconds.
(e) Stop the motor relay and release brake pedal. - Check the function of right front wheel.
Note: forbid making electromagnetic valve be ON in following situations.
(a) Make following operation when brake pedal is stepped down.
(b) Make electromagnetic valve SFRH and SFRR be ON at the same time, and check the brake pedal
should not be stepped down.
Note: Time when motor relay locates ON could not exceed 5 seconds, when it is necessary to
operate continually, interval time should be over 20 seconds.
(c) Make electromagnetic valve SFRH and SFRR be OFF at the same time, and check the brake pedal
should be able to be stepped down.
(d) Make electromagnetic valve SFRH and SFRR be ON at the same time, and check whether the brake
pedal could return.
Note: Time when motor relay locates ON could not exceed 5 seconds, when it is necessary to
operate continually, interval time should be over 20 seconds.
(e) Make motor relay be OFF and release brake pedal. - Check the function of other wheels.
Check the electromagnetic valves of other wheels by same procedure.
Hint:
Left front wheel: SFLH,SFLR
Right rear wheel: SRRH,SRRR
Left rear wheel: SRLH, SRLR
Change..........................................................
- Discharge brake liquid.
Note: do not leave brake liquid on paint surface of automobile body, if having, wash it cleanly. - Disassemble right front wheel.
Brake--Hydraulic pressure control unit148