Page 799 of 1395
Thermal Switch Operation l2WD)
During 4WD operation, pressure-regulated fluid is in contact with the clutch piston and the thermal switch.
lf the temperature of the fluid in the differential goes too high, the thermal switch pushes open the relief valve R. This
causes the pressure in the clutch piston to drop, and 4WD mode is disengaged.
THERMAL SWITCHRELIEF VALVE
Reliet Valve Operation
When the fluid pressure goes higher than the relief valve spring force, check valve R opens. Pressure applied at the clutch
piston is held constant. This feature adds stability by preventing the rear wheel drive system from experiencing excessive
to rque.
RELIEF VALVE
15-9
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Page 847 of 1395
Ret. No, I Tool NumbelDescriptionfty Page Reference
o
o
-@
€r
o
@rol
@
o
@
@(}
@
@
07GAF - PH70100
07HAG - SF10100
07GAG - SD40200 or
OTGAG - SD4O2OA
07JGG - 001010A
07MAC - S100200
OTNAD _ SR3O2OA
07NAG SR30900 or
07NAG , SR3OgOA
07RAK - 50401 10
07RAK - 5040120
07406 - 0010001 or
07406 - 0010004
07725 - 0030000
07746 - 0010100
07749 - 0010000
07916 - SA50001
07974 - SA50200 or
07974 - SA5050A
07974 - SA50800
Pilot Collar
Piston Seal Ring Guide
Piston Seal Ring Sizing Tool
Belt Tension Gauge
Ball Joint Remover,23 mm
Cylinder End Seal Remover Attachment
Valve Seal Ring Sizing Tool
P/S Joint Adaptor (Pump)
P/S Joint Adaptor (Hose)
P/S Pressure Gauge
Universal Holder
Attachment, 32 x 35 mm
Driver
Locknut Wrench, 40 mm
Sleeve Seal Ring Sizing Tool
Ball Joint Boot Clip Guide
'l
1
1
1
1
1
1
1
1
1
1
1
1,l
1
1
11-39
17-44
11-44
17 -14't]-31
17 -37't7 -4'l
17-'t6, 17
17-16, 17
11-16, 17
17-26,30't]-42, 43't1-42, 43
11-15't]-42
11-42, 50
* Included in the Belt Tension Gauge Set 07TGG - 001000,4
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l:I/\L----.--.--------_
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17-2
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Page 848 of 1395
Component Locations
lndex
Note these items during disassembly:' lf an intact airbag assembly has been removed from a scrapped vehicle or has been found defective or damaged dur-ing transit, storage or service. it should be deployed (see section 24),a Before removing the gearbox, remove the driver.s airbag assembly and steering wheel.. After installing the gearbox, check the wheel alignment and adjust if necessary.
SRS components are located in this area. Review the SRS component locations, precautions, and procedures an the SRssection (24) before performing repairs or servrce.
STEERING WHEELRemoval, page 17,18Disassembly/Reassembly, page 1?,18Installation, page 17-19DRIVER'S AIRBAG ASSEMBLYRemoval/lnstallation, see section 24
STEERING GEARBOXRack Guide Adjustment, page 17-15Removal, page 17-31Disassembly, page 17-34Reassembly, page 17,40Installation, page 17,51VALVE BODY UNITOverhaul, page 17-38
STEERING COLUMNRemoval/lnstallation. page 17-20Inspection, page l7 21Steering Lock Replacement, page 17 22CABLE REELRemoval/lnstallation, see section 24tcNrnoN swtTcHSee s€ction 23
STEERING HOSES, LINESReplacement. page l7-23
Pump Belt Inspection andAdjustment, pag€ t7-14Pump Pressure Check, page 17-16 ot 17-1jReplacemont, page 17-24Disassembly, pa96 17,25Inspection, page 17-26Reassembly. page17-28
RESERVOIRFluid R6placement. page 17 15Fluid Leakage lnspection, page 17-23
END BALL JOINTBallJoint Boot Replacement, page 17-50
17-3
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Page 849 of 1395
Troubleshooting
General Troubleshootin g
Check the following before you begin:
. Has the suspension been modified in a way that would affect steering?
. Are tire sizes, tire variety and air pressure correct?
. ls the steering wheel original equipment or equivalent?
. ls the power steering pump belt properly adjusted?
. ls steering fluid reservoir filled to proper level?
. ls the engine idle speed correct and steady?
Hard Steering (Check the power assist, see page 17-12. lf the force is over 29 N (3.0 kgl 6.6 lbfl, proceed with this troubleshooting.i
Abnormalthiidpressure (Iluidpressure is toohigh)
Relief pressuretoo low
Faulty valve body unit
Abnormal
Check the teed and return circuit lines and hosebetween the gearbox and pump for clogging anddeformation.
Normal line and hose
Check the pump fluid pressure(see page 17-16 or 17-17).Measure steady state lluid pres-
sure at idle with the pressure con-trol valve and the shut-off valve (it
so equipped) fully open.The fluid pressure should be 1,500kPa (15 kgf/cm,,213 psi)or less.
Normal
Check the flow control valve (see page 17 26).. Check the valv€ lor smooth movement in the hous-ing.. Check the relief valve for leaks.
Check the pump fluid pressure(see page 17-16 or l7-17).Measure pump relief pressure atidle with the pressure controlvalve and the shut'off valve lil soequipped) fully closed.The fluid pressure should be 6,9007,800 kPa (70 - 80 kgflcm,, 1,000- 1,140 psi).
Normal relief pressure
17-4
Go to page 17 5Faulty pump assemblyFaulty flow control valve
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Page 852 of 1395
Uneven or rough steering.Ad,ust the rack gu ide (see page 17- 15).
ll the problem is not corrected byadjusting the rack guide, replacethe gearbox.
Adjust the belttension. Replace thebelt, if necessary (see page 17-14).Belt slipping on pulley.
lf the engine stalls when thewheel is turned while the vehicleis stopped or moving at lowspeed, adjust the idle speed (seesection 111.
ldle speed low or erratic.
Check power steering lluid level. lfthe level is excessively low checkfor leaks in the system. Add fluidto the specified level.
Air in reservoir, or check powersteering tluid level.
lf fluid level is OK, check O-ringsand seals on both ends of thepump inlet hose, and the P/Spump housing mating surlacesand drive shaft oil seal for suction leaks. Check the reservoir forcracks, Replace parts as neces-
Pump belt slipping on pulley(pump stops momentarily).Adjust the belt tension (see page17-14) or replace belt.
Check if pump pressure is normaland the gauge needle travel is 500kPa (5 kgl/cm,, 71 psi) or less.Check the flow control valve if theneedle travel exceeds 500 kPa (5kgflcm' , 71 psi). lI the flow controlvalve is normal, replace the pumpas an assembly,
Install the power steering pres-sure gauge, Close the pressurecontrol valve and shut off valve (if
so equipped) fully and measurethe pump pressure (see page 17-16ot 17 17).
Steering wheel kicks backduring wide turns.
7-7
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Page 853 of 1395
Troubleshooting
Noise and Vibration
NOTE: Pump noise in first 2 - 3 minutes after starting in cold weather is normal.
Humming
Rattle or chattering
Humming due to pulsation of fluid is normal, particularly when the wheel isturned with the vehicle stooDed.
lf equipped with automatic trans-mission, the hum could be thetorque converter or pump noase.
Confirm by temporarily removingthe pump belt.
Feed hose (high-pressure) touch-ing the frame.Beposition the feed hose.
Loose steering shaft connector,tie-rod, or balljoint.Check and tighten, or replaceparts as necessary,
Column shaft wobbling.Roplace the column assembly.
Check the rack guide for properadjustment (see page 17-15).Adjust, if necessary.
Rattling sound and feeling when turning the steering wheel right and left with th€engine OFF is normal.
Pump noise, though not loud, from the valve body unit can be heard when turn-ing the steering wheel to full lock in either direction. This is normal. Do not holdthe steering wheel at full lock lor more than five seconds when inspecting.
17-8
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Page 855 of 1395
Troubleshooting
Fluid Leaks
Check the gearbox assembly for oil leaks carefully. Oil can leak out ot various points, depending on location of the faulty
oil seals/seal rings. Check the following before removing the gearbox from the frame.
Steering GearboxLeaking from the oil seal on thetop of the valve housing.Replace the valve oil seal fromthe valve housing.
Leaking from cylinder end intoleft tie rod boot.Replace the valve oil seal fromthe pinion shaft.
Replace the cylinder end seal onthe valve body unit side.
Leaking from cylinder end intoright tie-rod boot.Replace the cylinder end seal onthe cylinder end side.
Leaking lrom the shaft upper endsection or pin engagement sec-tion of the pinion shaft.Replace the valve body unit.
Tighten the connector. It it's stillleaking, replace the line, cylinderor valve housing.
Leaking from cylinder line A or Bconnections (at tlare nut).
Leaking caused by a damagedcylinder line A or B.Replace cylinder line A or B.
Leaking from pump outlet hoseand return line joint fitting on thevalve body unit {at tlare nut}.
Tighten the connector. ll it's stillleaking, replace the line, joint fit-ting or valve housing,
17-10
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Page 861 of 1395
lnspection and Adjustment
Pump Pressure Gheck With T/N 07406 - 0010001
Check the fluid pressure as follows to determine whetherthe trouble is in the pump orgearbox.
1. Check the powsr steering fluid level (see page 17-15), and pump belt tension (see page 17-14).
2. Disconnect the pump outlet hose from the pump
outlet with care so as not to spill the pow€r steeringiluid on the frame and other pans. thon install theP/S joint adapter (pumpl on the pump outlet.
6 x 1.0 mm BOLT{Part oftool)
FEED HOSE FITTING
PUMP OUTLET HOSE
11 N.m ll.1 kgl.m, E lbf.ftl
P/S PRESSURE GAUGE07('6 - 0010001
6 x t.0 mm BOLT{Part oftool)11 N.m(1.1 kgt m, 8 lbf.tr)
Connect the P/S joint adapter (hose) to the p/S pres-
sure gauge, then connect the pump outlet hose tothe P/S ioint adspter (hose).
Install the P/S pressure gauge to the p/S joint
adapter (pump),
17-16
5. Fully open the shut-off valve.
PRESSURECONTROL VALVE
6. Fully open the pressure controlvatve.
7. Start the engine and let it idle.
8. Turn the steering wheel from lock-to-lock severaltimes to warm the fluid to operating temperature.
9, Measure steady-state fluid pressure while the engineis idling. lf the pump is in good condition, the gauge
should read less than 1,500 kPa (15 kgf/cmr, 213 psi).
lf it reads high, check the outlet hose or valve bodvunit (see General Troubleshooting).
10. Close the pressure control valve, then close theshut-off valve gradually until the pressure gauge
nsedle is stable. Read the pressure.
CAUTION: Do not k€ap tha prca3un control valvoclorod mo.c thon 5 srconds or thc pump cluld bodamEgod by ovor-hoating.
11. lmmodiately open the pressure controlvalve fullv.
lf the pump is in good condition, the gauge shouldread at least 6,900 - 7,800 kpa (70 - 80 kgflcmr,'1,000 - 1.140 psi). A low reading means pump out-put is too low for full assist. Repair or replace theDUMD.
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