Lexus NX: Installation

INSTALLATION

PROCEDURE

1. INSTALL POWER STEERING ECU ASSEMBLY

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

(b) Install a new electric power steering motor shaft spacer to the power steering ECU assembly.

(c) Temporarily install the power steering ECU assembly to the electric power steering column sub-assembly with the 3 bolts. NOTICE: 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.

(d) Remove the No. 2 steering intermediate shaft assembly from the electric power steering column sub-assembly.

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

*a Cloth *b Steering Wheel Set Nut or equivalent

(f) Install the 2 nuts to the electric power steering column sub-assembly.

HINT:

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

(g) 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.

(h) Tighten the 3 bolts.

Torque:

18.5 N·m {189 kgf·cm, 14 ft·lbf}

(i) 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) NOTICE: Make sure that the shaft turns smoothly. HINT: If the result is not as specified, center the power steering ECU assembly again.

(j) 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}

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

(l) Connect the 3 connectors to the power steering ECU assembly.

(m) Install the 2 cable ties and heat resistant tape.

NOTICE:

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

(n) Install a new power steering ECU protector to the power steering ECU assembly.

2. INSTALL ELECTRIC POWER STEERING COLUMN SUB-ASSEMBLY

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3. PERFORM TORQUE SENSOR ZERO POINT CALIBRATION

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4. PERFORM ASSIST MAP WRITING

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