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 MANUALSFORD1994F 150 2WD PICKUP L6-300 4.9LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONPINPOINT TESTSDN - EGR VALVE POSITION SENSOR/EGR VACUUM REGULATOR SOLENOIDDN1 - ATTEMPT TO GENERATE DTC 337
1994 Ford F 150 2WD Pickup L6-300 4.9L
DN1 - Attempt to Generate DTC 337
1994 Ford F 150 2WD Pickup L6-300 4.9LSECTION DN1 - Attempt to Generate DTC 337
Diagnostic Trouble Code (DTC) 327 indicates the EGR Valve Position (EVP) sensor signal is less than the Self-Test minimum value of 0.2 volt.
NOTE: Because the EVP sensor is preloaded when attached to the EGR valve, a failure in the EGR valve causing the EVP sensor to lose preload may also set DTC 327.
Possible causes:
- Damaged EVP sensor.
- Damaged EGR valve.
- Open harness.
- Grounded harness.
- Damaged Powertrain Control Module (PCM).
- Key "OFF".
- Disconnect EVP sensor.
- Jumper VREF circuit to EVP circuit at the EVP sensor vehicle harness connector.
- Rerun Key On Engine Off (KOEO) and Key On Engine Running (KOER) Self-Test. Quick Test Appendix (Detailed Testing Instructions)
NOTE: If no DTCs are generated, immediately remove jumper and go directly to DN4. DN4 - Check EVP Circuit For Short to Ground
- Is DTC 337 present (ignore all other DTCs)?
Yes -- Replace EVP sensor. Remove jumper. Rerun quick test. Quick Test Appendix (Detailed Testing Instructions)
No -- Remove jumper. Go to DN2. DN2 - Check VREF Circuit Voltage
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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.