The EGR Valve Position (EVP) sensor monitors the position of the EGR valve pintle. The EVP sensor converts the mechanical movement of the pintle into an electrical voltage signal which is relayed to the PCM. The EVP sensor is a linear potentiometer in which resistance varies with the EGR valve pintle movement.Voltage is fed to the EVP by the signal return circuit. As the EGR is opened the EVP directs more voltage to the EEC and less down the voltage reference circuit. The EVP sensor provides the PCM with information on EGR flow and EGR system failures. The EVP should read between 0.24 and 0.67volts at idle with a closed EGR valve.

Possible causes:

•Damaged EVP sensor
•Corroded or dirty connector
•Damaged EGR valve
•Faulty Vacuum system
•Broken wire in harness
•Grounded harness
•Damaged Computer

EGR OPENING VOLTAGE
LT GRAY SENSOR		BLACK SENSOR
0%	0.50 volts	0%	0.90 volts
10%	0.75 volts	10%	1.25 volts
20%	1.10 volts	20%	1.65 volts
30%	1.45 volts	30%	1.95 volts
40%	1.80 volts	40%	2.30 volts
50%	2.15 volts	50%	2.65 volts
60%	2.50 volts	60%	3.00 volts
70%	2.85 volts	70%	3.35 volts
80%	3.20 volts	80%	3.70 volts
90%	3.55 volts	90%	4.05 volts
100%	3.90 volts	100%	4.40 volts

NOTE: Allow +/- .2 volts for all specifications
Ford EGR valves will open 100% at 8 inHg of vacuum. Therefore, 50% opening will be obtained by creating 4 inHg, etc.