TOYOTA PREVIA 91-97 REPAIR MANUAL

8-32 SUSPENSION AND STEERING

Troubleshootir

nrfOOIitH i,i, •.

Chirp noise in steering pump • Loose

Belt squeal (particularly noticeable at • Loose

full wheel travel and stand still

parking)

Growl noise in steering pump • Exce:

on

res

Growl noise in steering pump (partic- • Score

ularly noticeable at stand still park- pla

ing) • Extre

Groan noise in steering pump • Low <

• Air in
  cor

g the Power Steering Pump

CMNMI

belt

belt

sive back pressure in hoses

leering gear caused by

Fiction

i pressure plates, thrust

3 or rotor

ie wear of cam ring

II level

he oil. Poor pressure hose

lection.

Solution

• Adjust belt tension to specification


• Adjust belt tension to specification
  
  
  • Locate restriction and correct.
    Replace part if necessary.
  
  
  • Replace parts and flush system
  
  
  • Replace parts
  
  
  • Rll reservoir to proper level
    
    
    • Tighten connector to specified
      torque. Bleed system by operat-
      ing steering from right to left —
      full turn.
      Rattle noise in steering pump Vane's not installed properly
      Vanei»sticking in rotor slots
    
    
    
    
  
  
  
  

Swish noise in steering pump

Whine noise in steering pump Pum||!

Install properly

Free up by removing burrs,

varnish, or dirt

Defective flow control valve Replace part

shaft bearing scored Replace housing and shaft. Flush

system.

Hard steering or lack of assist • Loose pump belt

• Low (I level in reservoir
  NOTE: Low oil level will also result

Adjust belt tension to specification

Rll to proper level. If excessively

low, check all lines and joints for

Foaming milky power steering fluid,

low fluid level and possible low

pressure

Low pump pressure

Momentary increase in effort when

turning wheel fast to right or left

Steering wheel surges or jerks when

turning with engine running espe-

cially during parking

mexce

• Steei
  mt


• Lowe
  ag
  ptu


• Tires


• Air in
  toi
  ing


• Flow
  ati


• Pres
  rin


• Low


• Pum


• High


• Low


• Loos


• Stee
  pa


• Insul

ssive pump noise

ng gear to column misalign-

nt

coupling flange rubbing

tinst steering gear adjuster

3

not properly inflated

the fluid, and loss of fluid due

itemal pump leakage caus-

overflow

control valve stuck or inoper-

(e

ure plate not flat against cam

1

>il level in pump

> belt slipping

internal leakage

ill level

3 pump belt

ing linkage hitting engine oil

i at full turn

icient pump pressure-

evidence of external leakage.

Tighten loose connectors.

• Align steering column


• Loosen pinch bolt and assemble
  property


• Inflate to recommended pressure


• Check for leaks and correct. Bleed
  system. Extremely cold temper-
  atures will cause system aeria-
  tion should the oil level be low. If
  oil level is correct and pump still
  foams, remove pump from vehi-
  cle and separate reservoir from
  body. Check welsh plug and
  body for cracks. If plug is loose
  or body is cracked, replace
  body.


• Remove burrs or dirt or replace.
  Flush system.


• Correct


• Add power steering fluid as
  required


• Tighten or replace belt


• Check pump pressure. (See pres-
  sure test)


• Fill as required


• Adjust tension to specification


• Correct clearance


• Ci.in-R puif.p pressure. (See pros-
  sure test). Replace flow control
  valve if defective.
  90918C02