EGR Valve Position Sensor: Description and Operation

EGR valve position sensor:

The EVP sensor provides the EEC System with a signal indicating position of the EGR valve. The sensor measures the movement and position of the EGR valve with a voltage in relation to valve opening. An example of this relationship is as follows:

EGR OPENING VOLTAGE - BLACK SENSOR GRAY SENSOR
0% .90 volts .35 volts
10% 1.25 volts .75 volts
20% 1.65 volts 1.10 volts
30% 1.95 volts 1.45 volts
40% 2.30 volts 1.80 volts
50% 2.65 volts 2.15 volts
60% 3.00 volts 2.50 volts
70% 3.35 volts 2.85 volts
80% 3.70 volts 3.20 volts
90% 4.05 volts 3.55 volts
100% 4.40 volts 3.90 volts

NOTE: EGR closed position is very important. Timing is retarded if EGR flow is low.