Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSFORD1990RANGER 4WD L4-140 2.3L SOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSEGR VALVE POSITION SENSORDESCRIPTION AND OPERATION
1990 Ford Ranger 4WD L4-140 2.3L SOHC
EGR Valve Position Sensor: Description and Operation
1990 Ford Ranger 4WD L4-140 2.3L SOHCSECTION 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.
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.