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 MANUALSFORD1994TAURUS V6-182 3.0L DOHC SHOREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONPINPOINT TESTSDL - PFE/DPFE SENSOR; EVR SOLENOID TESTINGDL - TESTING NOTES
1994 Ford Taurus V6-182 3.0L DOHC SHO
DL - Testing Notes
1994 Ford Taurus V6-182 3.0L DOHC SHOSECTION DL - Testing Notes
DESCRIPTION
The Pressure Feedback Electronic (PFE) EGR system consists of a pressure sensor (PFE sensor), Electronic Vacuum Regulator (EVR) solenoid, and a vacuum actuated EGR valve.
The EVR solenoid regulates a vacuum signal to the EGR valve in response to a duty cycle signal from the Powertrain Control Module (PCM). The EVR solenoid will vent some of the source vacuum and transmit the remaining vacuum to the EGR valve in response to the level of the duty cycle. The higher the duty cycle, the more vacuum is transmitted to the EGR valve. Due to the design of the EVR solenoid, the available vacuum at the EGR valve never reaches the source vacuum level.
EGR flow rate is determined by monitoring the pressure across a fixed metering orifice as exhaust gasses pass through it. The PFE system has only one pressure signal input (downstream) and must rely on the PCM to indirectly infer the upstream exhaust pressure in order to determine the EGR flow rate. The PFE sensor transmits an analog voltage signal which decreases linearly as EGR flow increases.
With the feedback signal that either the PFE sensors provide, the PCM can then optimize the EGR flow rate by varying the EVR duty cycle.
NOTE
You should enter this Pinpoint Test only when you have been directed here from Diagnostic Routines.
REMEMBER:
To prevent the replacement of good components, be aware that the following non-Electronic Engine Controls (EEC) areas may be at fault:
- Damaged EGR valve
- Damaged vacuum reservoir
- Restricted exhaust
This Pinpoint Test is intended to diagnose only the following:
- Harness circuits: VREF, SIG RTN, EVR, VPWR
- EGR valve assembly
- PFE sensor
- Vacuum lines (EVR, PFE)
- EVR solenoid
- Powertrain Control Module
The Pressure Feedback Electronic (PFE) EGR system consists of a pressure sensor (PFE sensor), Electronic Vacuum Regulator (EVR) solenoid, and a vacuum actuated EGR valve.
The EVR solenoid regulates a vacuum signal to the EGR valve in response to a duty cycle signal from the Powertrain Control Module (PCM). The EVR solenoid will vent some of the source vacuum and transmit the remaining vacuum to the EGR valve in response to the level of the duty cycle. The higher the duty cycle, the more vacuum is transmitted to the EGR valve. Due to the design of the EVR solenoid, the available vacuum at the EGR valve never reaches the source vacuum level.
EGR Flow:
EGR flow rate is determined by monitoring the pressure across a fixed metering orifice as exhaust gasses pass through it. The PFE system has only one pressure signal input (downstream) and must rely on the PCM to indirectly infer the upstream exhaust pressure in order to determine the EGR flow rate. The PFE sensor transmits an analog voltage signal which decreases linearly as EGR flow increases.
With the feedback signal that either the PFE sensors provide, the PCM can then optimize the EGR flow rate by varying the EVR duty cycle.
NOTE
You should enter this Pinpoint Test only when you have been directed here from Diagnostic Routines.
REMEMBER:
To prevent the replacement of good components, be aware that the following non-Electronic Engine Controls (EEC) areas may be at fault:
- Damaged EGR valve
- Damaged vacuum reservoir
- Restricted exhaust
This Pinpoint Test is intended to diagnose only the following:
- Harness circuits: VREF, SIG RTN, EVR, VPWR
- EGR valve assembly
- PFE sensor
- Vacuum lines (EVR, PFE)
- EVR solenoid
- Powertrain Control Module
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.