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Old 03-29-2007, 11:38 AM   #1 (permalink)
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I have a taurus 2002 SE. The CEL is on so I went to autozone to get the code pulled. It said P1400 - manufacturer ctrl: auxiliary emission controls. The technician said that this code is a manufacturer code and is not in their database. Do you guys have any idea what this could mean? I don't even know what auxiliary emission control is.

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Old 03-29-2007, 05:12 PM   #2 (permalink)
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According to the 2002 Ford Powertrain Control/Emissions Diagnosis manual, Diagnostic Trouble Code (DTC) P1400 indicates that the Dual-Pressure-Feedback-Exhaust-Gas-Recirculation (DPFEGR) feedback voltage as measured by the Powertrain Control Module (PCM) is incorrect. This voltage is generated by the DPFE sensor. This sensor is a known pattern failure component on Taurii. There are numerous threads on this forum concerning it. With the car on and the engine off the DPFE output voltage should be near V reference, or between 4.0 and 6.0 volts.

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Old 03-29-2007, 11:04 PM   #3 (permalink)
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Man it's DPFE again? I had to replace the sensor on a different Taurus. Well I'l probably try to replace it again.

I remember on my 01 taurus the code for DPFE was something else. Other than DPFE is there anything else that could be the culprit? I don't want to overlook anything...

Thanks drjkel!

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Old 03-30-2007, 06:10 AM   #4 (permalink)
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Please be careful here, I don't want to misguide you. You are absolutely correct, P1400 is not the usual DTC thrown for a failing DPFE sensor. I don't remember which DTC is. Someone on this forum should be able to say. P1400 is pretty specific. It says that the DPFE voltage as measured at the PCM is incorrect. There's a lot of equipment that can affect that measurement, for example, the analog-to-digital convertor in the PCM, the wiring from the DPFE sensor to the PCM, the DPFE sensor itself, grounds, or the V reference supply to the DPFE sensor. A good visual inspection may reveal something. Some time spent with a digital volt meter (high input impedance) or a good scan tool that can interrogate the DPFE voltage PID would be helpful. Then again, the DPFE sensor is notoriously unreliable.

Good luck. Let the forum know how it turns out. We all like to learn.

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Old 03-30-2007, 07:06 AM   #5 (permalink)
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THe most typical codes for a failed DPFE are EGR flow codes P0401 / P0402.
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Old 03-30-2007, 10:01 AM   #6 (permalink)
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Thanks all for the reply. I believe this taurus has a replacement DPFE sensor from autozone when I bought it (definitely not the original sensor with the Ford logo). So I wouldn't be surprised if it has failed again .

Where would I go to find a reference on what voltage I'm supposed to be seeing coming out of the sensor? I think you said 0.4 to 0.6 volts? Also is there a good place to do this measurement? I haven't looked at the circuitry carefully so I have no idea how these things are wired.

Thanks again for all the help

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Old 03-30-2007, 12:11 PM   #7 (permalink)
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P1400 - DPF EGR Sensor Circuit Low Voltage Detected The EGR monitor checks the DPF EGR sensor signal to the PCM for low voltage. The test fails when the average voltage to the PCM drops to a voltage less than the minimum calibrated value.

Causes may be....

DPFEGR circuit short to GND
Damaged DPF EGR sensor
VREF short to GND
Damaged PCM

A DPF EGR PID reading less than 0.2 volt with the key ON and engine OFF or running, indicates a hard fault.

There should be 5V going to the sensor from the PCM. This is called reference voltage.
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Old 04-03-2007, 06:32 AM   #8 (permalink)
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well I replaced the sensor. BTW what a bitch to get that thing off. I actually ended up breaking it. The CEL went away in two days. Hopefully the problem is fixed. The sensor on the vehicle was the original sensor so it's been there for a few years.... not surprised that it broke. Thanks all for your help!!
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