Accelerometer moving limit. Help me please!

Please help me! I had a problem with my final project game 2D, i tried to use accelerometer control for my project, but i had a problem, my character game (motor) still can move out of the track if i tilt my android device. if i tilt to the left, character wil get stuck on the left of track, if i tilt to the right, character will be out of the track. i want make a limit position for the character but i dont know the code to make limit access for my character, i tried many different way on youtube to make that happen, but still didnt work. if somebody can help me, im very thankful for that :) please...

this is my script character controller:

 using UnityEngine;
 using System.Collections;
 
 public class motorController : MonoBehaviour {
 
    
     public float motorSpeed;
     public float maxPos = 2.5f;
     
 
     Vector3 position;
     public uiManager ui;
     public audioManager am;
     public audioManager ad;
     
 
     private scoreManager theScoreManager;
 
     void Awake() {
         am.motorSound.Play();
     }
 
 
     // Use this for initialization
     void Start () {
 
         position = transform.position;
 
         theScoreManager = FindObjectOfType<scoreManager>();
 
     }
     
     // Update is called once per frame
     void Update () {
 
         theScoreManager.scoreIncreasing = true;
 
         // Coding accerleration move character
         float temp = Input.acceleration.x ;
 
         if ((transform.position.x < 2.5 && Input.acceleration.y > 0) || (transform.position.x > -2.5 && Input.acceleration.y < 0))
 
             transform.Translate(temp, 0, 0 * motorSpeed);
 
     }
 
     void OnCollisionEnter2D(Collision2D col){
         if(col.gameObject.tag == "mobil musuh")  {
             Destroy (gameObject);
             ui.gameOverActivated();
             am.motorSound.Stop();
             ad.crashSound.Play();
 
 
             theScoreManager.scoreCount = 0;
             theScoreManager.scoreIncreasing = false;
 
         }
     }
 
 
 }
 

THIS THE PICT MY GAME 2D: