PIC18f452 simple LEd problem

Hi all, i am using a PIC18f452 with the C18 compiler.
i am trying to interface this with a QTI line sensor.

when it is connected to the voltmeter, i see the voltages varying when it detects something.
however i am trying to set an LED when it detects this change.

// set i/o pins on PIC
TRISCbits.TRISC2 = 0; // W LineSnsrPwr ;output from PIC 17
TRISCbits.TRISC1 = 1; // R LineSnsrIn ;input to PIC 16


PORTCbits.RC2 = 1; // W send high to linesnsr power
Delay1KTCYx(5); //delay for 5ms


PORTCbits.RC2 = 0; // W send low to linesnsr power

if (PORTCbits.RC1==0){
TRISCbits.TRISC3 = 0;
PORTCbits.RC3 = 1; // LED2
}



LED 2 is supposed to light when the light is refracted. can anyone help me spot the problem??

the voltages vary from 2.4V when nothing is in front of it to -0.12V when it is completely covered.