6C
P/S System Symptom Diagnosis
Condition Possible Cause Action
Steering wheel feels heavy (at low speed).
Fluid deteriorated, low viscosity, different type of fluid mixed
Change fluid.
Pipes or hoses deformed, air entering through joint
Correct or replace.
Insufficient air bleeding from piping
Bleed air.
Belt worn, lacking in tension
Adjust belt tension or replace belt as necessary. (M13 engine model)
Replace bolt. (K9K engine model)
Tire inflation pressure too low
Inflate tire.
Wheel alignment out of adjustment
Adjust front wheel alignment.
Steering wheel installed improperly (twisted)
Install steering wheel correctly.
Hydraulic pressure failing to rise (See NOTE.)
Replace P/S pump.
Slow hydraulic pressure rise (See NOTE.)

NOTE:
Be sure to warm up engine fully before performing this check. Pump vanes are sometimes hard to come out where temperature is low.
Condition Possible Cause Action
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 bleed air.
Slipping belt
Adjust belt tension or replace belt as necessary. (M13 engine model)
Replace belt. (K9K engine model)
No idle-up. (M13 engine model)
Defective pressure switch
Replace pressure switch (terminal set).

NOTE:
Acceptable if idling speed does not drop.
Condition Possible Cause Action
Steering wheel returns slowly from turns.
Dust or foreign object mixed in fluid
Change fluid.
Deformed pipes or hoses
Correct or replace.
Steering column installed improperly
Install correctly.
Wheel alignment maladjusted
Adjust.
Linkage or joints not operating smoothly
Correct.

NOTE:
Turn steering wheel 90° at 35 km/h (22 mile/h) and let it free. If it returns more than 60° then, it is normal.
Condition Possible Cause Action
Vehicle pulls to one side during straight driving.
Low or uneven tire inflation pressure
Inflate tire(s) as necessary.
Wheel alignment maladjusted
Adjust.
Defective spool valve
Replace gear box assembly.
Steering wheel play is large and vehicle wanders.
Loose steering shaft nut
Retighten.
Loose linkage or joint
Retighten.
Loose gear box fixing bolt
Retighten.
Front wheel bearing worn
Replace.
Fluid leakage.
Loose joints of hydraulic pressure pipes and hoses
Retighten.
Deformed or damaged pipes or hoses
Correct or replace.
Gear box
Replace gear box assembly.
Abnormal noise.
Air drawn in due to insufficient fluid
Replenish fluid.
Air drawn in through pipe or hose joints
Retighten or replace.
Belt slipping (loose)
Adjust. (M13 engine model)
Replace. (K9K engine model)
Worn belt
Replace.
Loose steering linkage
Retighten.
Loose gear box fixing bolt
Retighten.
Loose pitman arm
Retighten.
Pipes or hoses in contact with chassis
Correct.
Defective pump vane
Replace pump assembly.
Malfunction of flow control valve
Replace gear box assembly.
Defective pump shaft bearing
Replace pump assembly.

NOTE:
Some hissing noise may be heard through steering column when turning steering wheel with vehicle halted. It is from operation of the valve in the gear box and indicates nothing abnormal.