Electronic Power Steering (Eps) System: Specifications Acura TL IV facelift

Torque Sensor Neutral Position

The EPS control unit stores the torque sensor neutral position in the EEPROM. The torque sensor neutral position must be memorized whenever the steering gearbox or the EPS control unit is replaced.

Note. The torque sensor neutral position is not affected when erasing the DTCs.

Memorizing the Torque Sensor Neutral Position

The torque sensor neutral position must be memorized whenever the steering gearbox or the EPS control unit is replaced. Note that the torque sensor neutral position is not affected when erasing the DTC.

Note. The torque sensor is temperature sensitive. When memorizing the torque sensor neutral position, the ambient temperature must be above 68°F (20°C).

Scheme 1

1. With the ignition switch in LOCK (0) or with the vehicle ignition in the OFF mode, connect the HDS to the data link connector (DLC) (A) located under the driver's side of the dashboard.
2. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
3. Make sure the HDS communicates with the vehicle and the EPS control unit. If it does not, troubleshoot the DLC circuit (see DLC CIRCUIT TROUBLESHOOTING ).
4. From the EPS MENU, select MISCELLANEOUS TEST, then TORQUE SENSOR LEARN, and follow the screen prompts on the HDS. NOTE: See the HDS Help menu for specific instructions.
5. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

Torque Sensor Operation

When the steering wheel is turned, inductance is changed by the movement of the core within the Torque Sensor. The amount this voltage changes varies with the amount of movement, and direction of the core, then it is amplified by the interface circuitry of the sensor coil and output to the EPS control unit as a steering signal.

Scheme 2

DTC 31-01: Torque Sensor Neutral Position Not Written

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
4. Do the memorizing of the torque sensor neutral position (see MEMORIZING THE TORQUE SENSOR NEUTRAL POSITION ).
5. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
6. Check for DTCs with the HDS. Is DTC 31-01 indicated? YES - Replace the EPS control unit (see EPS CONTROL UNIT REMOVAL/INSTALLATION ). NO - The system is OK at this time.

See also:
• FRAME BRACE REPLACEMENT