REMOVAL AND INSTALLATION
| CAUTION | When the hydraulic unit (integrated with ASC-ECU) is replaced, after turning the ignition switch ON or OFF (vehicle information from ETACS-ECU is registered), always carry out the calibration of all sensors (steering wheel sensor, G and yaw rate sensor, and brake fluid pressure sensor) at one time. (Refer to ALL SENSOR CALIBRATION (G AND YAW RATE SENSOR, STEERING WHEEL SENSOR, BRAKE FLUID PRESSURE SENSOR) ). |
Scheme 37
<< A >> HYDRAULIC UNIT (ASC-ECU) REMOVAL
| CAUTION | Be careful when removing the hydraulic unit because it is heavy. Never loosen the nuts and the bolts because the hydraulic unit cannot be disassembled. Do not drop or shock the hydraulic unit. Do not turn the hydraulic unit upside down or lay down the unit because the inner air becomes difficult to be bled. |
| CAUTION | The vehicle speed detection encoder collects any metallic particle easily, because it is magnetized. Make sure that the encoder should not collect any metallic particle. Check that there is not any trouble prior to reassembling it. |
Scheme 38
Note. The vehicle speed detection encoder is integrated with the front wheel bearing and the rear hub assembly, which cannot be disassembled.
Scheme 39
- Align the mounting bolt hole position of rear wheel speed sensor with the mounting bolt hole position of rear wheel hub assembly. CAUTION: Do not insert the rear wheel speed sensor at an angle or by prying the sensor because it may be possible that the O-ring of rear wheel speed sensor cannot be mounted properly. After the insertion, do not perform an alignment of mounting bolt hole positions by rotating the rear wheel speed sensor.
- As shown in the illustration, mount the rear wheel speed sensor while keeping the sensor perpendicular to the rear wheel hub assembly.
>> B << HARNESS CLIP INSTALLATION
Install the front wheel speed sensor to the harness clip as shown in the illustration.
Scheme 40
>> C << FRONT WHEEL SPEED SENSOR GROMMET/REAR WHEEL SPEED SENSOR GROMMET INSTALLATION
Install the front wheel speed sensor grommet and the rear wheel speed sensor grommet to the body panel snugly as shown in the illustration.
Scheme 41
<< A >> STEERING WHEEL SENSOR REMOVAL
| CAUTION | When removing the steering wheel sensor from the clock spring, do not rotate the sensor rotating part with it energized. |
Disengage the claws of the clock spring one by one in a clockwise or counterclockwise direction. Remove the steering wheel sensor from the clock spring.
>> A << STEERING WHEEL SENSOR INSTALLATION
| CAUTION | Install the steering wheel sensor with its rotating part removed. If the rotating part is rotated 360°, a failure occurs in calibration, steering wheel sensor and ASC system. After installation, check the steering wheel neutral position of the data list No. 11 by scan tool MB991958. |
Insert the protrusion of the clock spring into the hole of the steering wheel sensor. Securely fit the protrusion of the steering wheel sensor into the groove of the clock spring to install the steering sensor.
Note. A new steering wheel sensor has a pin for preventing the rotation of (fixing) the steering wheel sensor. After installing the column switch assembly, remove this pin.