Brake--Vacuum booster assemblyVacuum booster assemblyInspection on automobile1. Check the vacuum booster(a) Check the gas sealed performance.
(1) Start the engine, and extinguish after one or two minutes,
then step and release brake pedal slowly several times.
Hint: if the first step is lowest, second and third step
rise gradually, and this shows the gas sealed per-
formance of booster is normal.
(2) Step down brake pedal when engine is running, then
extinguish the engine.
Hint: if the distance from pedal to floor does not
change in 30 seconds, this shows gas seal perfor-
mance of booster is normal.
(b) Working inspection.
(1) When engine is at parking state, step brake pedal sev-
eral times to check brake pedal.
The height from floor should not change.
(2) Step down brake pedal, then start the engine.
Hint: if pedal drops a little, this shows working is
normal.2. Check vacuum check valve(a) Check vacuum check valve.
(1) Remove pipe clamp, and disassemble vacuum pipe.
(2) Disassemble vacuum check valve.
(3) Blow air to check: in the direction from booster to engine,
the check valve should ventilate, but its opposite direc-
tion should not ventilate.
(4) If finding any malfunction, change vacuum check valve.Change1. Discharge brake liquidNote: do not spill the brake liquid on paint surface of automobile body, if having, wash it cleanly.2. Disassemble air filter assembly [64000033]
3. Disassemble carbon canister assembly [4G18-1129020]
4. Disassemble brake main pump subassemblyGood
Bad
FirstSecondThird
Con-
ductionNot con-
duction138
Hydraulic control unit (equipping with ABS)Inspection on automobile1. 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.2. 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.3. 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.4. 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, SRLRChange1. Discharge brake liquid.Note: do not leave brake liquid on paint surface of automobile body, if having, wash it cleanly.2. Disassemble right front wheel.Brake--Hydraulic pressure control unit148
Power steering--Poser steering system
Inspection on automobile
1. Check driving belt
(a) Check whether the belt has been abraded too much with eyes, and rope is broken.
If finding any defect, change the driving belt.
Hint: Some light crack at the side of belt rib could be approved, but if belt has any crack from
its rib, it is necessary to change.
2. Exhaust air of power steering system
(a) Check the oil level.
(b) Lift up automobile body, and support it with bracket.
(c) Turn steering wheel.
(1) Turn steering wheel slowly from left and right to bottom for several times when engine extinguishes.
(d) Lay down the automobile.
(e) Start the engine to make it run at idling speed for several minutes.
(f) Rotate steering wheel.
(1) Keep engine at idling speed, and turn the steering wheel from left or right to bottom and keep this
state for 2-3 seconds, then turn it to the other direction for 2-3 seconds.
(2) Repeat (1) for several times.
(g) Engine extinguishes.
(h) Check whether there is any foam or emulsification
phenomenon.
If there is any foam or emulsification phenomenon and
it is necessary to exhaust air second time, it is necessary
to check whether the system has any leakage.
(i) Check the oil level.
3. Check the oil level
(a) Keep automobile horizontal.
(b) Extinguish the engine, and check the oil level of oil stor-
age tank.
If oil level is too low, add oil.
Power steering oil: automatic transmission oil
DEXRON’’ II or III
Hint: check whether the oil level is in the HOT mark
scope of oil storage tank, if oil is cool, check the
oil level is in COLD mark scope.
(c) Start the engine, and keep it at idling speed.
(d) Turn steering wheel from left bottom to right bottom for
several times to make oil temperature increase.
Oil temperature: 80°C
Normal Abnormal
200
Normal Abnormal
(e) If there is any foam or emulsification phenomenon, it is necessary to exhaust air in power steering
system.
(f) Keep the engine at idling speed, and measure the oil
level of oil storage tank.
(g) Engine extinguishes.
(h) After waiting for several minutes, measure the oil level
of oil storage tank again.
Maximal increased height of oil level: 5mm
If finding any problem, it is necessary to exhaust
the air in power steering system.
(i) Check the oil level.
4. Check steering oil pressure.
(a) Disassemble oil pressure supply pipe from power steering gear. (referring to page 205)
(b) Connect special tool liking that shown in figure.
Note: when checking, the valve of special tool should be opened.
(c) Exhaust the air in power steering system.
(d) Start the engine, and keep it at idling speed.
(e) Turn steering wheel from left bottom to right bottom for several times to make oil temperature
Power steering--Poser steering system
increase.
Oil temperature: 80°C
(f) Keep the engine at idling speed, and close the valve of
special tool, then observe the reading of special tool.
Minimal oil pressure: 6400kPa
Note:
yThe closing time of oil pressure meter valve could not
Accessory
Power steering
gear
InOut
Accessory Oil pressure supply pipe
Power
steering
gearClose
Pump Oil tank
Special tool
¡Ü¡Ü
¡Ü¡Ü¡Ü5mm
Special tool
201