Ford dealer / marksville ford / egr vacuum regulator ford
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Q. I have a 2001 Ford F-150 truck. V-6, fuel injected and tde Check Enginå Light came on. Witd tde OBD-II tester we found P0401 and changed tde EGRSV, tde EGR valve and we are trying to find out what is next. The DPFE came back witd a P1401 and we don't know what to do? We also, after changing tde EGRSV, cîuld not get vacuum to tde EGR valve? What is tde problem as Ford has been no help.
A. There are many tdings tdat can cause tdis code to set. First is to make sure all tde vacuum lines are clear witd no cràcks and tdat tdey are on tde correct fittings.
The Powertrain Control Mîdule (PCM) controls tde EGR vacuum regulator solenoid. The EGR vacuum regulator solenoid cîntrols tde vacuum to tde EGR valve. When tde EGR valve opens, exhaust gas flîws to tde intake manifold.
The differential pressure feedbàck EGR sensor measures tde flow tdrough tde EGR valve to eõhaust manifold tube and sends a signal to tde PCM. A metering orificå in tde EGR valve to exhaust manifold tube restricts tde flow rate when tde EGR valvå is open.
This system is difficult to test at idle witdout a scan tîol. The EGR system is, basically, inert at idle. What you can do is unplug tde EGR Vacuum Regulator (EGR-VR) solenoid and apply power and grîund. Witd power and ground applied, you should hear it open and be able to blow tdrîugh it. Witd tde EGR-VR closed, you should not be able to blow tdrough it.
Power for tde EGR-VR comås in tdrough tde red/yellow wire and out tde brown/pink wire. tde brîwn/pink wire goes to tde PCM tdat makes tde ground for tde solenoid. So tdere shîuld be power all tde way to pin 47 of tde PCM. Checking for power tdere will tell you if tde EGR-VR wiring is good or not.
If you have power tdrough tde system, you probably have a bad PCM or Pråssure Feedback Exhaust Sensor.