RM38T0EC _55 Steering _112287 POWER ASSIST SYSTEMS _0510880 POWER STEERING SYSTEM J

POWER ASSIST SYSTEMS  POWER STEERING SYSTEM  Abnormal Feel at Steering End Position  


SYSTEM DESCRIPTION

This vehicle employs end position contact shock reduction control for column EPS, designed to protect components by suppressing torque input when steering mechanism components reach their end position, and contributing to a feeling enhanced steering quality through reduction of the steering end position contact sound.

CAUTION / NOTICE / HINT

NOTICE:
·

If components related to the steering gear are replaced without first disconnecting the cable from the negative auxiliary battery terminal, the learned value of the steering end position stored in the vehicle may deviate from the actual steering end position, affecting steering feel.

·

In the following situations, perform end position learning:

-

When the battery has been replaced, or removed and reinstalled.

-

When components related to the steering gear have been replaced.




PROCEDURE

1.CLEAR STEERING END POSITION INFORMATION
NOTICE:

When components related to the steering gear have been replaced, perform end position learning.


a.

Center the steering wheel and set the front tires in the straight-ahead position.


b.

Clear the end position learning value.

i.

When using the GTS:

1.

Follow the instructions on the GTS screen to end position learning value clear.


Chassis > EMPS > Utility
Tester Display
End Position Learning Value Clear
50005 405 4799

ii.

When not using the GTS:

1.

Turn the ignition switch to ON.

2.

Disconnect the cable from the negative auxiliary battery terminal for the specified period of time.

3.

Connect the cable to the negative auxiliary battery terminal.




Result:
Proceed to
NEXT



NEXT

2.PERFORM STEERING END POSITION LEARNING
2.PERFORM STEERING END POSITION LEARNING
a.

Start the engine.


b.

Turn the steering wheel all the way to the left and right alternatingly, 1 time in each direction.


Result:
Proceed to
NEXT



NEXT

3.CHECK STATUS OF LEARNED LEFT/RIGHT END POSITION FOR END TORQUE LIMIT CONTROL
3.CHECK STATUS OF LEARNED LEFT/RIGHT END POSITION FOR END TORQUE LIMIT CONTROL
Chassis > EMPS > Data List
Tester Display Measurement Item Range Normal Condition Diagnostic Note
Status of Learned Left/Right End Position for End Torque Limit Control Shows steering rack end learning status Left Direction (Unlearned) & Right Direction (Unlearned) / Left Direction (Unlearned) & Right Direction (Temporary Position) / Left Direction (Unlearned) & Right Direction (Decision Position) / Left Direction (Temporary Position) & Right Direction (Unlearned) / Left Direction (Temporary Position) & Right Direction (Temporary Position) / Left Direction (Temporary Position) & Right Direction (Decision Position) / Left Direction (Decision Position) & Right Direction (Unlearned) / Left Direction (Decision Position) & Right Direction (Temporary Position) / Left Direction (Decision Position) & Right Direction (Decision Position) / Reading Impossibility Left Direction (Decision Position) & Right Direction (Decision Position) -
Chassis > EMPS > Data List
Tester Display
Status of Learned Left/Right End Position for End Torque Limit Control
50003 405 215
OK:

The Data List value displays "Left Direction (Decision Position) & Right Direction (Decision Position)".


Result:
Proceed to
NEXT


HINT:

If the result is other than "Left Direction (Decision Position) & Right Direction (Decision Position)", perform the procedure again from Step 1.



NEXT

END