How to Test the Ford EGR Valve
EGR Vacuum Solenoid, DPFE Sensor
-Part VI-


TEST 8: DPFE Sensor Ground Return

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This test is a continuation of TEST 7... and here you're gonna' test the Ground Return Circuit of the DPFE Sensor.

This Ground (for the 5 V REFERENCE Signal) is provided by the PCM, so it's crucial that you take the utmost care not to short this circuit to 12 volts as your are testing/verifying it. Use a Multimeter for this test and not a Test Light.

  1. Attach (with an appropriate tool) the BLACK Multimeter lead to the wire labeled with the number 2.
  2. Connect the RED lead of the Multimeter to the Battery Positive Terminal.
  3. Place the Multimeter in DC Volts mode.
  4. Have your assistant turn the key to On and notice the voltage reading on your Multimeter.
  5. The Multimeter should read 12 volts.

CASE 1: If your Multimeter registered 10-12 Volts: This indicates that the PCM is providing a DPFE Sensor Ground to the DPFE Sensor. If you have gotten to this test by following the following flow of testing: TEST 1, then TEST 2, then TEST 7... then this result indicates that the DPFE Sensor is BAD. Replace the DPFE Sensor.

CASE 2: If your Multimeter DID NOT register 10-12 Volts: Re-check all of your connections and repeat the test. The DPFE Sensor will not work without this Ground (that the PCM provides) and will set an EGR Fault Code that will light up the Check Engine Light (CEL) on your Instrument Cluster. Repairing the issue of this missing Ground should solve your EGR Valve Fault Code.

Some Tips and Suggestions

It's very rare for the DPFE Sensor to have any type of issue with its Ground Return Circuit. But if you do encounter this condition and you have triple-checked all of your Multimeter's connections and set-up, then the two most likely causes are:

  1. An open short in the wire (that feeds this Ground to the DPFE Sensor) between the PCM and the DPFE Sensor.
  2. Or the PCM has fried.

Testing the two above conditions are beyond the scope of this article, but at least you have eliminated the EGR Valve, the DPFE Sensor, and the EGR Vacuum Regulator Solenoid as the cause of the EGR Valve System malfunction.



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Ford Vehicles:

  • Aerostar
    • 1994, 1995, 1996, 1997
  • Countour
    • 1995, 1996, 1997, 1998, 1999, 2000
  • Crown Victoria
    • 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002
  • E150, E250, E350
    • 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004

Ford Vehicles:

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    • 2001, 2002
  • Escort
    • 1996, 1997, 1998, 1999, 2000, 2001, 2002
  • Excursion
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Ford Vehicles:

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  • Explorer
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Ford Vehicles:

  • F150, F250, F350
    • 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004
  • Mustang
    • 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003. 2004
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Ford Vehicles:

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Lincoln Vehicles:

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Lincoln Vehicles:

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Mercury Vehicles:

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Mercury Vehicles:

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Mercury Vehicles:

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Mazda Vehicles:

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