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1、5107U01POWER STEERING POWER STEERING SYSTEM5111536Author : Date :2004 COROLLA (RM1037U)POWER STEERING SYSTEMPRECAUTION1. HANDLING PRECAUTIONS ON SRS AIRBAG SYSTEM(a) The vehicle is equipped with SRS (Supplemental Restraint System) such as the driver airbag and frontpassenger airbag. Failure to carry
2、 out service operation in correct sequence could cause the SRS tounexpectedly deploy during servicing, possibly leading to a serious accident. Before servicing (includ-ing removal or installation of parts, inspection or replacement), be sure to read the precautionary noticefor the supplemental restr
3、aint system (See page 601).5105L02512POWER STEERING POWER STEERING SYSTEM1537Author : Date :2004 COROLLA (RM1037U)PROBLEM SYMPTOMS TABLEHINT:Use the table below to help you find the cause of the problem. The numbers indicate the probability of thecause of the problem. Check each part in the order sh
4、own. If necessary, repair or replace these parts.Symptom Suspect Area See pageHard steering1. Tires (Improperly inflated)2. Power steering fluid level (Low)3. Drive belt (Loose)4. Front wheel alignment (Incorrect)5. Steering system joints (Worn)6. Suspension arm ball joints (Worn)7. Steering column
5、(Binding)8. Power steering vane pump9. Power steering gear28151314426526175185118Poor return1. Tires (Improperly inflated)2. Front wheel alignment (Incorrect)3. Steering column (Binding)4. Power steering gear2812655118Excessive play1. Steering system joints (Worn)2. Suspension arm ball joints (Worn)
6、3. Intermediate shaft, Sliding yoke (Worn)4. Front wheel bearing (Worn)5. Power steering gear261730175118Abnormal noise1. Power steering fluid level (Low)2. Steering system joints (Worn)3. Power steering vane pump4. Power steering gear51351851185105M02F40449F40897Normal AbnormalF40898POWER STEERING
7、POWER STEERING SYSTEM5131538Author : Date :2004 COROLLA (RM1037U)ONVEHICLE INSPECTION1. INSPECT DRIVE BELT(a) Visually check the belt for excessive wear, frayed cords,etc.If any defect is found, replace the drive belt.HINT:Cracks on the rib side of a belt are considered acceptable. If themissing chu
8、nks from the ribs are found on the belt, it should bereplaced.2. BLEED POWER STEERING SYSTEM(a) Check the fluid level.(b) Jack up the front of the vehicle and support it with thestands.(c) Turn the steering wheel.(1) With the engine stopped, turn the wheel slowly fromlock to lock several times.(d) L
9、ower the vehicle.(e) Start the engine.(1) Run the engine at idle for a few minutes.(f) Turn the steering wheel.(1) With the engine idling, turn the wheel to left or rightfull lock position and keep it there for 2 3 seconds,then turn the wheel to the opposite full lock positionand keep it there for 2
10、 3 seconds.(2) Repeat (1) several times.(g) Stop the engine.(h) Check for foaming or emulsification.Especially, if the system has to be bled twice because of foam-ing or emulsification, check for fluid leaks in the system.(i) Check the fluid level.3. CHECK FLUID LEVEL(a) Keep the vehicle level.(b) W
11、ith the engine stopped, check the fluid level in the oilreservoir.If necessary, add fluid.Fluid: ATF DEXRONfi II or IIIHINT:Check that the fluid level is within the HOT LEVEL range on thereservoir tank. If the fluid is cold, check that it is within the COLDLEVEL range.F40897NormalAbnormalR11786Engin
12、e Idling Engine Stopped5 mm (0.20 in.)or less514POWER STEERING POWER STEERING SYSTEM1539Author : Date :2004 COROLLA (RM1037U)(c) Start the engine and run it at idle.(d) Turn the steering wheel from lock to lock several times toraise fluid temperature.Fluid temperature: 75 80 C (167 176 F)(e) Check f
13、or foaming or emulsification.If foaming or emulsification is identified, bleed the power steer-ing system.(f) With the engine idling, measure the fluid level in the oilreservoir.(g) Stop the engine.(h) Wait a few minutes and measure the fluid level in the oilreservoir again.Maximum fluid level rise:
14、 5 mm (0.20 in.)If a problem is found, bleed the power steering system.(i) Check the fluid level.4. CHECK STEERING FLUID PRESSURE(a) Disconnect the pressure feed tube from the PS gear (Seepage 5118).(b) Connect SST, as shown in the illustration.SST 0964010010 (0964101010, 0964101020,0964101030)NOTIC
15、E:Check that the valve of the SST is in the open position.(c) Bleed the power steering system.(d) Start the engine and run it at idle.(e) Turn the steering wheel from lock to lock several times toraise fluid temperature.Fluid temperature: 75 80 C (167 176 F)F42426SSTOUTAttachmentPressureFeed TubeAtt
16、achmentINZ15498OilReservoirPS VanePumpPS GearSSTClosedZ15499OilReservoirPS VanePumpPS GearSSTOpenZ15500OilReservoirPS VanePumpPS GearSSTOpenLock PositionPOWER STEERING POWER STEERING SYSTEM5151540Author : Date :2004 COROLLA (RM1037U)(f) With the engine idling, close the valve of the SST and ob-serve the reading on the SST.Fluid pressure:7,300 7,800 kPa (75 80 kgf/cm2, 1,067 1,138 psi)NOTICE:Do not keep th
