Component Tests and General Diagnostics
SERVICE ADJUSTMENT PROCEDURECHECKING STEERING WHEEL FREE PLAY
1. Start the engine and with the steering wheel in the straight ahead position.
2. Measure the play while turning the steering wheel to the left and right.
Standard value : Steering wheel free play : 30 mm (1.2 in)
3. If the play exceeds the standard value, inspect the connection between the steering shaft and tie rod ends.
CHECKING STEERING ANGLE
1. Place the front wheel on a turning radius gauge and measure the steering angle.
Steering angle
2. If the measured value is not within the standard value, adjust the toe and inspect again.
CHECKING STEERING WHEEL RETURN
1. The force required to turn the steering wheel and the wheel return should be the same for both moderate and sharp turns.
2. When the steering wheel is turned 90° and held for a couple of seconds while the vehicle is being driven at 20-30 kph (12-19 mph), the steering wheel should return at least 20° from its central position when it is released.
NOTE:
If the steering wheel is turned very quickly, steering may be momentarily difficult. This is not a malfunction because the oil pump output will be somewhat decreased.
CHECKING POWER STEERING FLUID LEVEL
1. Position the vehicle on a level surface.
2. Start the engine. With the vehicle kept stationary, turn the steering wheel several times continuously to raise the fluid temperature to 50-60°C (122-140°F).
3. With the engine at idle, turn the steering wheel fully clockwise and counter-clockwise several times.
4. Make sure that there is no foaming or cloudiness in the reservoir fluid.
5. Stop the engine and check for any difference in fluid level between a stationary and a running engine.
NOTE:
a. If the fluid level varies 5 mm (0.2 in) or more, bleed the system again.
b. If the fluid level suddenly rises after stopping the engine, further bleeding is required.
c. Incomplete bleeding will produce a chattering sound in the pump and noise in the flow control valve, and lead to decreased durability of the pump.
OIL PUMP PRESSURE TEST (OIL PUMP RELIEF PRESSURE)
1. Disconnect the pressure hose from the oil pump. Connect the special tool between the oil pump and pressure hose as illustrated.
2. Bleed the air, and then start the engine and turn the steering wheel several times so that the fluid temperature rises to approximately 50°C (122°F).
3. Set the engine speed to 1,000 rpm.
4. Close the shut-off valve of the special tool and measure the fluid pressure to confirm that it is within the range.
standard value : Relief pressure: 90 kgf/cm2 (1280 psi)
CAUTION:
Do not keep the shut-off valve on the pressure gauge closed longer than 10 seconds.
5. Remove the special tools, and tighten the pressure hose to the specified torque.
Tightening Torque Nm (kgf-m, lb-ft) : 65 - 75(6.5 - 7.5, 47 - 54)
6. Bleed the system.