POWER STEERING ECU(for Power Tilt and Power Telescopic Steering Column) INSTALLATION

CAUTION / NOTICE / HINT

PROCEDURE

1. INSTALL POWER STEERING ECU ASSEMBLY

   
   

   1. Install a new electric power steering motor shaft damper to the power steering ECU assembly.

   2. Install a new electric power steering motor shaft spacer to the power steering ECU assembly.

   3. 

      Temporarily install the power steering ECU assembly to the electric power steering column sub-assembly with the 3 bolts.

      Note

      Do not tighten the bolts until the heads contact the surface of the power steering ECU assembly. Leave a small amount of clearance so that the power steering ECU assembly can be centered in a later procedure.

   4. Remove the No. 2 steering intermediate shaft assembly from the electric power steering column sub-assembly.

   5. 

      *a	Cloth
      *b	Steering Wheel Set Nut or equivalent

      Secure the electric power steering column sub-assembly in a vise between aluminum plates or pieces of cloth as shown in the illustration.

      Note

      
      

      • Do not overtighten the vise as the electric power steering column sub-assembly may become deformed.

      • Secure the power steering ECU assembly so that it faces straight up.

   6. Install the 2 nuts to the electric power steering column sub-assembly.

      Tech Tips

      The nuts to use are the steering wheel set nut or equivalents.

      Steering wheel set nut part No.	Thread diameter	Thread pitch
      90179-12071	12 mm (0.4724 in.)	1.25 mm (0.0492 in.)

   7. 

      Turn the steering main shaft by 180° to the left and right at a speed of 1 turn per second. Repeat these movements 2 to 3 times to center the power steering ECU assembly.

   8. Tighten the 3 bolts.

      Torque:

      18.5 N*m  { 189 kgf*cm, 14 ft.*lbf }

   9. 

      Check the turning torque of the steering main shaft.

      Standard preload
      0.9 to 1.5 N*m (10 to 15 kgf*cm, 8 to 13 in.*lbf)

      Note

      Make sure that the shaft turns smoothly.

      Tech Tips

      If the result is not as specified, center the power steering ECU assembly again.

   10. Install the No. 2 steering intermediate shaft assembly to the electric power steering column sub-assembly.

       Torque:

       35.3 N*m  { 360 kgf*cm, 26 ft.*lbf }

   11. Connect the 2 connector clamps of a new ECU wire harness sub-assembly to the harness bracket.

   12. Connect the 3 connectors to the power steering ECU assembly.

   13. for LHD:

       
       

       1. Install the 2 cable ties and heat resistant tape.

          

          *a

          Cable Tie

          *b

          Heat Resistant Tape

          Note

          As heat from the power steering motor assembly may generate smoke, use heat resistant tape (resistant to 100°C (212°F) or higher).

   14. Install a new power steering ECU protector to the power steering ECU assembly.

2. INSTALL ELECTRIC POWER STEERING COLUMN SUB-ASSEMBLY

   Click here

3. PERFORM TORQUE SENSOR ZERO POINT CALIBRATION

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4. PERFORM ASSIST MAP WRITING

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