Suzuki Grand Vitara JB419. 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

, 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

, 142 psi)

1. P/S fluid reservoir
2. Attachment
3. Gasket
4. Union bolt
5. High pressure side
6. Low pressure side

(A)

(B)

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

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

, 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

, 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

I5JB0A630009-04

1. P/S fluid reservoir
2. Gauge valve (open)
3. Oil pressure gauge
4. P/S pump
5. P/S gear case

I5JB0A630010-01

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