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PS-96 POWER ASSISTED SYSTEM (POWER STEERING) GENERAL DIAGNOSTIC TABLE Trouble Possible cause Corrective action Hiss noise (continuous) Relief valve emits operating sound when steering wheel is Normal Relief valve emits operating sound when steering wheel is Defective Rattling noise (intermittent) While Interference with adjacent parts Check clearance. Loosened installation of oil pump, oil tank, pump bracket, Retighten. Loosened installation of oil pump pulley or other pulley(s) Retighten. Loosened linkage or play of steering or suspension Loos- Retighten or replace. Sound generates from the inside of gearbox or oil pump. Replace bad parts of the gearbox Knocking Excessive backlash Adjust and retighten. Loosened tightening or play of tie-rod, tie-rod end Retighten or replace. Grinding noise (continuous) Vane pump aeration Inspect and retighten fluid line Vane pump seizing Replace oil pump. Pulley bearing seizing of oil pump Replace oil pump. Folded hose, flat pipe Replace. Squeal, squeak (intermittent or Maladjustment of pulley belt Adjust or replace. Run out or soilage of V-groove surface of oil pump pulley Clean or replace. Sizzling noise (continuous) Fluid aeration Fix wrong part causing aeration. Damaged pipe of gearbox Replace pipe. Abnormal inside of hose or pipe Rectify or replace. Abnormal inside of oil tank Replace. Removed oil tank cap Install cap. Whistle (continuous) Abnormal pipe of gearbox or abnormal inside of hose Replace bad parts of gearbox or Whine or growl (continuous or Loosened installation of oil pump, oil pump bracket Retighten. Abnormal inside of oil pump, hose Replace oil pump, hose, if the Torque converter growl, air conditioner compression growl Remove power steering pulley Creaking noise (intermittent) Abnormal inside of gearbox Replace bad parts of gearbox. Abnormal bearing for steering shaft Apply grease or replace. Generates when turning steering wheel with brake (ser- If the noise goes off when brake Vibration Too low engine speed at start Adjust and instruct customers. Vane pump aeration Fix wrong part. Damaged valve in oil pump, gearbox Replace oil pump, bad parts of Looseness of play of steering, suspension parts Retighten. |