37-STEERING SHAFT DISASSEMBLY AND REASSEMBLY

DISASSEMBLY AND ASSEMBLY

caution

Do not reuse the product that has been dropped because its internal components may be defective even if it has no apparent damage.
Always keep motor (EPS-ECU) away from the matter that generates magnetic force.
Handle carefully to prevent binding or damage of the wiring harness.
When replacing the electric steering lock, complete the chassis number registration (Refer to GROUP 42B - On-vehicle Service, Registration when Replacing OSS-ECU and Electric Steering Lock ).

			Disassembly steps
<<A>>	>>C<<	1.	Steering lock bolt (lower)
		2.	Steering lock bracket and steering lock
<<A>>	>>C<<	3.	Steering lock bolt (upper)
	>>C<<	4.	Steering lock bracket
	>>C<<	5.	Mechanical steering lock <Vehicles without KOS> or electric steering lock <Vehicles with KOS>
	>>B<<	6.	Steering column band
<<B>>	>>A<<	7.	Motor (EPS-ECU) connector
		8.	Spacer^*
		9.	Rubber spring^*
<<B>>	>>A<<	10.	Motor (EPS-ECU)
		11.	Steering column shaft

Required Special Tools:

MB990326: Preload socket

note

A steering lock, a steering lock bracket and a steering lock bolt are supplied as a single unit. A mechanical steering lock assembly (a mechanical steering lock, a steering lock bracket, a steering lock bolt, a key reminder switch/key ring antenna assembly and an ignition switch are included.) <Vehicles without KOS> or an electric steering lock assembly (a electric steering lock, a steering lock bracket and a steering lock bolt are included.) <Vehicles with KOS> is also supplied.
When the steering lock assembly is supplied, the steering lock bracket is assembled to the steering lock and the steering lock bolt head (upper) is broken off.
For removal and installation of key reminder switch/key ring antenna and ignition switch, Refer to GROUP 54A - Ignition Switch Removal and Installation .
^*: After removing the spacer and the rubber spring, be careful not to lose them.

DISASSEMBLY SERVICE POINT

<<A>> STEERING LOCK BOLT REMOVAL

1. Use a drill to make a hole just deeply enough for the tap to stand on the steering lock bolt.

2. Remove the steering lock bolt using recommended tool screw extractor (MB992678) or equivalent.

<<B>> MOTOR (EPS-ECU) REMOVAL

caution

Do not remove the collapse part (shown in the illustration).

1. Remove the wiring harness.

2. Adjust the electric motor so that its mating surface is horizontal, and then secure the worm gear housing on the steering column shaft with a vice.

caution

While clamping, be sure to keep the mating surface of the motor horizontal.
Clamp the worm housing in a vice via rag to prevent damage.

3. Install the nut to the end of the steering column shaft. Then use the preload socket (Special tool: MB990326) to rotate the shaft at a rate of one turn per 4 to 6 seconds, and then measure the total rotation torque.

note	Be sure to make a note of the measured value, as the value will be used when installing the motor. Rotate by 180° in left and right directions from the neutral position, and measure the total rotation torque.

4. Remove the motor mounting bolts.

REASSEMBLY SERVICE POINT

>>A<< MOTOR (EPS-ECU) INSTALLATION

1. Insert the motor, and check that the motor flange moves with the bolts not tightened.

caution

Be careful to avoid scratches or intrusion of foreign materials on the mating surface of the motor and the worm housing.
Proceed carefully to ensure that the electric motor does not move, otherwise noise may be caused.

2. Rotate the steering column shaft at a speed of approximately one turn per second. While doing so, tighten the electric motor mounting bolts alternately by hand.

note	The steering column shaft can be rotated in either direction (right and left).

3. Tighten the electric motor mounting bolts to the specified torque.

Tightening torque: 19 ± 3 N·m (14 ± 2 ft-lb·)

4. Install the two nut to the end of the steering column shaft. Then use the preload socket (Special tool: MB990326) to rotate the shaft at a speed of one turn per 4 to 6 seconds, and then measure the total rotation torque.

note	Be sure to make a note of the measured value, as the value will be used when installing the motor. Rotate by 180° in left and right directions from the neutral position, and measure the total rotation torque.

caution

If the total rotation torque fluctuation compared with the value measured at removal is ±10% or more, remove the motor again and repeat installation steps 1, 2 and 3.

5. Connect the wiring harness.

6. Use a black felt pen to apply a mark near the label as shown as a visual indication that this work has been completed.

>>B<< STEERING COLUMN BAND INSTALLATION

caution

There must be no clearance between the torque sensor wiring harness and the housing.
Guide the steering column band between the sensor housing mounting bolt and the projection on the worm housing.
On completion, check the followings.

The wiring harness must be free of twists, sharp bend.
The wiring harness must be secured without looseness.

Tie the wiring harness wires with the steering column band.

>>C<< STEERING LOCK/STEERING LOCK BRACKET/STEERING LOCK BOLT INSTALLATION

1. Secure the steering lock bracket to the steering lock with steering lock bolt (upper). Tighten the steering lock bolt until its head is broken off.

2. Insert the steering lock into the tip of the column shaft, fit the protrusion of the steering lock to the hole of the steering column shaft, install the steering lock and tighten the steering lock bolt (lower) until its head is broken off.

caution

As for the mechanical steering lock for vehicles with CVT, connect the body side wiring harness connector to the key interlock solenoid connector. Do not connect the harness connector to the key interlock solenoid dummy connector. As for the mechanical steering lock for vehicles with M/T, connect the body side wiring harness connector to the key interlock solenoid dummy connector.