Suzuki Grand Vitara JB416 / JB420 / JB419. Service manual - part 365

6C-3 Power Assisted Steering System: 

Schematic and Routing Diagram

P/S Fluid Flow Diagram

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Diagnostic Information and Procedures

P/S System Symptom Diagnosis

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1. Power steering pump

3. P/S fluid reservoir

5. Pinion

2. Valve section

4. Rack

6. Cylinder

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

Adjust belt tension or replace belt 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

Adjust belt tension or replace belt 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.

Power Assisted Steering System:  6C-4

Steering Wheel Check

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• Check steering wheel for looseness or rattle by trying 

to move it in its shaft direction and lateral direction.
If found defective, repair or replace.

• Check steering wheel for play, holding car in straight 

forward condition on the ground and with engine 
stopped.

Steering wheel play “a”
: 0 – 30 mm (0 – 1.2 in.)

If steering wheel play is not within specification, 
inspect as follows and replace if found defective.
– Tie-rod end ball stud for wear
– Lower ball joint for wear
– Steering shaft joint for wear
– Steering pinion or rack gear for wear or breakage
– Each part for looseness

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.

Steering wheel play is 
large and vehicle wanders

Refer to “Steering Symptom Diagnosis 
in Section 6A”.

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

Adjust belt tension.

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.

Malfunction of control valve in gear case Replace gear case.
Bearing of P/S pump shaft defective

Replace bearing.

No idle up (petrol engine 
model)

Power steering pressure switch 
defective

Replace power steering pressure switch.

Condition

Possible cause

Correction / Reference Item

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6C-5 Power Assisted Steering System: 

Steering Force Check

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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 Recovery Check

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WARNING

!

 

When performing a check, select a place 
where there is no traffic or possibility of a 
traffic accident and be very careful during 
testing to avoid occurrence of an accident.

 

Check steering wheel for recovery as follows.

1) Rotate it to either right or left end.
2) Keep it at the end, and start the vehicle slowly.
3) Accelerate vehicle slowly.

If steering wheel begins to return at the vehicle speed 
less than 10 km/h (6.3 mph), it is normal condition.
If the check result is abnormal, diagnose the fault part 
referring to “Poor recovery from turns” in “P/S System 
Symptom Diagnosis”.

Idle Up System Check

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1) Warm up engine to normal operating temperature.
2) Turn A/C switch OFF, if equipped.
3) Turn steering wheel fully and check idle speed.

Engine idle speed drops a little momentarily when 
steering wheel is turned fully but returns to its 
specified level immediately. 
If power steering pressure switch connector is 
connected, check the same with that connector 
disconnected.
Momentary drop of engine idle speed should be less 
when it is connected than when disconnected.

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Power Assisted Steering System:  6C-6

Hydraulic Pressure in P/S Circuit Check

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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”.

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)

[A]: M16A engine model

3. Gasket

[B]: J20A engine model

4. Union bolt

[C]: F9Q engine model

5. High pressure side

1. P/S fluid reservoir

6. Low pressure side

2. Attachment

(A)

(B)

(B)

5

1

6

(A)

(B)

2

5

4

3

(A)

(B)

(A)

(B)

[A]

[B]

[C]

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1. P/S fluid reservoir

4. P/S gear case

2. Gauge valve (open)

5. High pressure side

3. P/S pump

6. Low pressure side

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2

3

5

1

6

4

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