i write a code to test my HC-SR04 sensor to measure distance but seem there is no responce from the sensor, after i program and when i turn on the pic, the LED from port A0 turn on and not turn off even i move more than 100 cm..pls help

i'm using pickit 2, mplab ide wit c18 compiler, internal OSC 4Mhz.. tq

Code:
#include
#include
//#include 
//#include 
#include 

#pragma config OSC=INTIO2
#pragma config WDT=OFF
#pragma config PWMPIN = OFF

#define Trig PORTBbits.RB3
#define Echo PORTBbits.RB2

void Call_Init_PIC (void);
void sendPulse(void);
void T0Delay10us(void);
void delay2(void);

unsigned int distance ;
unsigned int time;

void main(void)
{
OSCCONbits.IRCF2 = 1;
OSCCONbits.IRCF1 = 1;
OSCCONbits.IRCF0 = 0;

TRISAbits.TRISA0=0;
TRISAbits.TRISA1=0;

Call_Init_PIC ();
while(1)
{
//T1CON=0x0;
TMR1H= 0;
TMR1L= 0;
sendPulse();

while(Echo == 0);

T1CONbits.TMR1ON = 1;
while(Echo == 1);
T1CONbits.TMR1ON = 0;
//Delay10KTCYx(255);   
time= TMR1H;
time= time<<8;
time= time|TMR1L;
distance = (.0017* time);
Delay10KTCYx(100); 
PIR1bits.TMR1IF=0;
/*
time = (TMR1L | (TMR1H<<8));   //Reads Timer Value
    time = time/58.82;                //Converts Time to Distance
    time = time + 1;                  //Distance Calibration\
    
if(time>=2 && time<=6)
{

PORTBbits.RB0=1;
Delay10KTCYx(255);
PORTBbits.RB0=0;
Delay10KTCYx(255);


}
*/
//if(time>=7)
//{


//PORTBbits.RB1=1;


//}

if(distance<=100)

{

LATAbits.LATA0=1;
Delay10KTCYx(100);
LATAbits.LATA0=0;
Delay10KTCYx(100);

}

if(distance>=101)

{

LATAbits.LATA0=0;
Delay10KTCYx(100);
LATAbits.LATA1=1;


}
}
}

void Call_Init_PIC (void)
{
TRISBbits.TRISB3=0;
TRISBbits.TRISB2=1;
}


void sendPulse(void)
	{
	Trig=1;
Delay10TCYx(1);
	Trig=0;
Delay10KTCYx(255);
Delay10KTCYx(255);
	}
/*
void T0Delay10us()
	{
	T0CON=0x00;
	TMR0H=0XFF;
	TMR0L=0XCD;
	T0CONbits.TMR0ON=1;
	while(INTCONbits.TMR0IF==0);
	T0CONbits.TMR0ON=0;
	INTCONbits.TMR0IF=0;
	}

void delay2()
{
	Delay1TCY();
	Delay1TCY();
	Delay1TCY();
	Delay1TCY();
	Delay1TCY();
}
*/