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Measurement Of Steering Effort

  1. CHECK STEERING WARNING LIGHT. 

    Does the steering warning light illuminate?

    • Yes  : Using Subaru Select Monitor, read the DTC and inspect according to it. For detailed operation procedures, refer to "Application help".
    • No  : Go to  2.
  2. CHECK STEERING WARNING LIGHT. 
    1. Using Subaru Select Monitor, display the data of [EPS operating condition].
    2. Connect the Subaru Select Monitor, and turn the steering wheel. (One lock to lock)

    Is the [EPS operating condition] normal without displaying any DTC code?

    • Yes  : Go to  3.
    • No  : If the [EPS operating condition] is "Assist limitation", stop the engine for approx. 10 minutes and perform the procedures from step 1.
  3. CHECK STEERING EFFORT. 
    1. Stop the vehicle on paved road.
    2. Set the tire air pressure to the specification.
    3. Start the engine.
    4. Run the engine at idle.
    5. Install a spring scale on the steering wheel.
    6. Pull the spring scale at a right angle to the steering wheel, and measure both right and left steering wheel efforts.
    Fig 1: Checking Steering Wheel Efforts Using Spring Scale
    G11268191Courtesy of SUBARU OF AMERICA, INC.

    Is the steering effort less than 29.4 N (3.0 kgf, 6.6 lbf)?

    • Yes  : Go to  4.
    • No  : Go to  8.
  4. CHECK STEERING EFFORT. 
    1. Stop the engine.
    2. Pull the spring scale at a right angle to the steering wheel, and measure both right and left steering wheel efforts.

    Is the steering effort less than 294.2 N (30 kgf, 66.2 lbf)?

    • Yes  : Go to  5.
    • No  : Perform the inspection or adjustment around the suspension part.
  5. CHECK TORQUE SENSOR OUTPUT VALUE. 
    1. Display the data of [Torque sensor main output] and [Torque sensor sub output] using Subaru Select Monitor.
    2. Read the voltage value of torque sensor.
    NOTE: When measuring, place the steering wheel at the center position.

    Is the voltage 2.425 - 2.575 V?

  6. CHECK TORQUE SENSOR OUTPUT VALUE. 
    1. Remove the universal joint assembly - steering.
    2. Display the data of [Torque sensor main output] and [Torque sensor sub output] using Subaru Select Monitor.
    3. Read the voltage value of torque sensor.

    Is the voltage 2.425 - 2.575 V?

  7. CHECK TORQUE SENSOR OUTPUT VALUE. 
    1. Remove the universal joint assembly - steering.
      NOTE: Check that the universal joint assembly - steering moves up and down smoothly without installing the bolt. Then tighten the bolts first on the gearbox side and then on the column shaft side.
    2. Display the data of [Torque sensor main output] and [Torque sensor sub output] using Subaru Select Monitor.
    3. Read the voltage value of torque sensor.

    Is the voltage 2.425 - 2.575 V?

  8. CHECK STEERING WHEEL EFFORT. 
    1. Remove the universal joint assembly - steering.
    2. Measure the steering wheel effort.

    Is the steering effort less than 2.26 N (0.23 kgf, 0.51 lbf)?

  9. CHECK STEERING WHEEL EFFORT. 

    Measure the steering wheel effort.

    Is the difference of steering effort between right and left less than 20%?

  10. CHECK UNIVERSAL JOINT ASSEMBLY - STEERING. 

    Measure the swing torque of joint. (Yoke of column assembly - steering side) Ref. to POWER ASSISTED SYSTEM (POWER STEERING)>Universal Joint>INSPECTION .

    Is the swing torque of the universal joint assembly - steering less than 8.1 N (0.81 kgf, 1.84 lbf)?

  11. CHECK UNIVERSAL JOINT ASSEMBLY - STEERING. 

    Measure the swing torque of joint. (Yoke of gearbox side) Ref. to POWER ASSISTED SYSTEM (POWER STEERING)>Universal Joint>INSPECTION .

    Is the swing torque of the universal joint assembly - steering less than 6.8 N (0.68 kgf, 1.54 lbf)?

  12. CHECK FRONT WHEEL. 

    Check the front wheels.

    Does the front wheels have unsteady revolution or rattling, or does the brake drag?

    • Yes  : Inspect, readjust and replace if necessary.
    • No  : Go to  13.
  13. CHECK TIE-ROD ENDS. 

    Remove the tie-rod ends.

    Does the tie-rod ends of suspension have unsteady revolution or rattling?

    • Yes  : Inspect and replace if necessary.
    • No  : Go to  14.
  14. CHECK BALL JOINT. 

    Remove the ball joint.

    Does the ball joints of suspension have unsteady revolution or rattling?

    • Yes  : Inspect and replace if necessary.
    • No  : Go to  15.
  15. CHECK GEARBOX. 

    Measure the rotating of gearbox.

    Ref. to POWER ASSISTED SYSTEM (POWER STEERING)>Electric Power Steering Gearbox>INSPECTION>LIMIT .

    Is the rotational resistance of the steering gearbox less than 18.3 N (1.9 kgf, 4.1 lbf)? Is the difference between the right and left rotational resistances less than 20%?

  16. CHECK GEARBOX. 

Measure the sliding of gearbox.

Is the sliding resistance of the steering gearbox less than 350 N (35 kgf, 79 lbf)? Is the difference between the right and left sliding resistances less than 20%?

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