Suzuki Grand Vitara JB419. Service manual — part 119
Power Assisted Steering System: 6C-2
P/S Pump Construction
S5JB0B6301003
The power steering pump is a vane type and is driven by the V-ribbed belt from the crankshaft.
Power steering (P/S) pump specifications
Flow Control Valve (Relief Valve)
As the discharge rate of the P/S pump increases in proportion to the pump revolution speed, a flow control valve is
added to control it so that the optimum amount of fluid for steering operation is supplied according to the engine speed
(driving condition).
Diagnostic Information and Procedures
P/S System Symptom Diagnosis
S5JB0B6304001
Model
Vane type
Hydraulic pressure
control
Relieved pressure
7850 kPa (79.3 kg/cm
2
, 1128 psi)
Control device
Flow control valve and relief valve
Condition
Possible cause
Correction / Reference Item
Steering wheel feels
heavy (at low speed)
Fluid deteriorated, low viscosity,
different type of fluid mixed
Replace fluid.
Pipes or hoses deformed, air entering
through joint
Replace defective part.
Insufficient air purging from P/S circuit
Purge air.
P/S belt worn, lacking in tension
Replace belt and/or tensioner as necessary.
Tire inflation pressure excessively low
Inflate tire.
Front end alignment out of order
Check and adjust front end alignment.
Steering wheel installed improperly
(twisted)
Install steering wheel correctly.
Bind in tie-rod or tie-rod end ball joint
Replace defective part.
P/S pump hydraulic pressure fails to
increase
Check pressure and repair or replace defective
part.
P/S pump hydraulic pressure increases
but slowly
Check pressure and repair or replace defective
part.
Steering gear case malfunction
Replace gear case.
Steering wheel feels
heavy momentarily when
turning it to the left or
right
Air drawn in due to insufficient amount of
fluid
Add fluid and purge air.
Slipping P/S belt
Replace belt and/or tensioner as necessary.
P/S pump hydraulic pressure fails to
increase
Check pressure and repair or replace defective
part.
P/S pump hydraulic pressure increases
but slowly
Check pressure and repair or replace defective
part.
Steering gear case malfunction
Replace gear case.
Poor recovery from turns Deformed pipes or hoses
Replace defective part.
Steering column installed improperly
Install steering column correctly.
Front end alignment out of order
Check and adjust front end alignment.
Ball joints binding
Replace defective part.
P/S pump hydraulic pressure fails to
increase
Check pressure and repair or replace defective
part.
P/S pump hydraulic pressure increases
but slowly
Check pressure and repair or replace defective
part.
Steering gear case malfunction
Replace gear case.
Vehicle pulls to one side
during straight driving
Mismatched or uneven tire
Replace tire.
Low or uneven tire inflation pressure
Inflate tires to proper pressure or adjust right
and left tires inflation pressure.
Brake dragging in one wheel
Repair.
Front end alignment out of order
Check and adjust front end alignment.
Rear end alignment out of order
Check and adjust rear end alignment.
Malfunction of control valve in gear case Replace gear case.
6C-3 Power Assisted Steering System:
Steering Force Check
S5JB0B6304003
1) Place vehicle on level road and set steering wheel at
straight-ahead position.
2) Check that tire inflation pressure is as specified.
(Refer to tire placard.)
3) Start engine and keep it running till power steering
fluid is warmed to 50 to 60
°C (122 to 140 °F).
4) With engine idling, measure steering force by pulling
spring balancer hooked on steering wheel in
tangential direction.
Steering force
: Less than 30 N (3.0 kg, 6.6 lb)
Steering wheel play is
large and vehicle wanders
Refer to “Steering Symptom Diagnosis
in Section 6A in related manual”.
Fluid leakage
Loose joints of (hydraulic pressure)
pipes and hoses
Retighten.
Deformed or damaged pipes or hoses
Replace defective part.
Abnormal noise
Air drawn in due to insufficient amount of
fluid
Add fluid and purge air.
Air mixed into fluid from pipes or hoses Replace pipes or hoses.
Slipping (loose) P/S belt
Replace tensioner as necessary.
Worn P/S belt
Replace belt.
Loose gear case fastening bolt
Retighten bolts.
Loose linkage or joints
Retighten.
Pipes or hoses in contact with part of
vehicle body
Install pipes and hoses correctly.
Vanes of P/S pump defective
Replace defective part or P/S pump assembly.
Malfunction of control valve in gear case Replace gear case or P/S pump assembly.
Bearing of P/S pump shaft defective
Replace bearing or P/S pump assembly.
Condition
Possible cause
Correction / Reference Item
I5JB0B630002-01
I5JB0A630057-01
Power Assisted Steering System: 6C-4
Hydraulic Pressure in P/S Circuit Check
S5JB0B6304006
1) After cleaning joint of high pressure hose and P/S
pump thoroughly, disconnect hose from pump and
install special tool (oil pressure gauge, attachment
and hose).
CAUTION
!
Take care not to cause damage to A/C
condenser during service operation, if
equipped.
Special tool
(A): 09915–77412
(B): 09915–77420
2) Check each connection for fluid leakage and bleed
air. Refer to “P/S System Air Bleeding Procedure in
related manual”.
3) With engine idling, turn steering wheel and warm up
engine till temperature of fluid in tank rises to 50 – 60
°C (122 – 140 °F).
4) Check back pressure by measuring hydraulic
pressure with engine idling and hands off steering
wheel.
When back pressure is higher than specified values,
check control valve and piping for clogging.
Back pressure
Lower than 1000 kPa (10 kg/cm
2
, 142 psi)
1. P/S fluid reservoir
2. Attachment
3. Gasket
4. Union bolt
5. High pressure side
6. Low pressure side
(A)
(A)
(B)
(B)
5
1
6
(B)
2
5
4
3
I5JB0B630003-01
1. P/S fluid reservoir
2. Gauge valve (open)
3. P/S pump
4. P/S gear case
5. High pressure side
6. Low pressure side
I5JB0B630002-01
2
3
5
1
6
4
I5JB0A630008-01
6C-5 Power Assisted Steering System:
5) Check relief pressure.
a) Increase engine speed to about 600 r/min. (rpm).
Close gauge valve gradually while watching
pressure increase indicated by gauge and take
reading of relief pressure (maximum hydraulic
pressure).
If it is higher than specified values, possible
cause is malfunction of relief valve.
If it is lower than specified values, possible
cause is either failure of P/S pump or settling of
relief valve spring.
Relief pressure when gauge value is closed
: 7650 – 8340 kPa (77.3 – 84.2 kg/cm
2
, 1099 –
1197 psi)
CAUTION
!
Be sure not to close gauge valve for longer
than 10 seconds.
b) Open gauge valve fully and increase engine
speed to about 1500 r/min. (rpm). Then turn
steering wheel to the left or right fully and take
reading of relief pressure.
If it is higher than specified values, possible
cause is malfunction of relief valve.
If it is lower than specified values, possible
cause is failure in steering gear case. Replace
gear case.
Relief pressure when gauge value is opened
: 7650 – 8340 kPa (77.3 – 84.2 kg/cm
2
, 1099 –
1197 psi)
CAUTION
!
Be sure not to hold steering wheel at fully
turned position for longer than 10 seconds.
1. P/S fluid reservoir
2. Gauge valve (shut)
3. Oil pressure gauge
4. P/S pump
5. P/S gear case
2
4
1
3
5
I5JB0A630009-04
1. P/S fluid reservoir
2. Gauge valve (open)
3. Oil pressure gauge
4. P/S pump
5. P/S gear case
2
4
1
3
5
I5JB0A630010-01
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