[Shotimes] 327 trouble code

[Kevin & Cheryl Airth]

Bob:
 Steve has the easiest solution. Remember that you may not have enough
voltage to the sensor too. What code 327 is saying is that "I (The PCM) want
to see 4-6 VDC returning from the DPFE circuit but I am seeing less than .2
VDC". Only 2 reasons for too low of voltage.

1. Voltage too low going into the DPFE. Wiring or corrosion in plugs. Bad
PCM
2. The DPFE is shorted inside and stopping the signal from returning to the
PCM.

So you need to measure Vref coming into the DPFE if you DO NOT get the 337
code when the jumper is in place. You should see 4-6 VDC. Usually right on 5
VDC.

The SHO does NOT have a EGR valve position sensor.
.
.




> Most likely, it is due to a faulty DPFE sensor.
>
> However, an open supply circuit to the DPFE or the output shorted to
ground
> or open to the PCM would also cause the same error code.
>
> Simplest way to isolate if it the DPFE or not is to unplug the sensor,
> jumper the DPFE output signal to the supply voltage and rerun the test.
If
> the KOEO tes tnow throws a 337 (output too high), then the external
> circuitry is okay and the DPFE is the fault.  About $50-60 bucks.
>
> Steve
>
>
> ----- Original Message -----
> From: "ROBERT SCHIRMER" <1surferbum@msn.com>
> To: <shotimes@autox.team.net>
> Sent: Wednesday, January 14, 2004 8:24 PM
> Subject: [Shotimes] 327 trouble code
>
>
> > gentlemen
> >
> > 93 ATX, just started to throw out a check engine lite , when engine
warms
> up.
> > It is throwing out a KOEO trouble code of 327, which according to the
> shotimes
> > trouble code list means DPFE output circuit below minimum test. My code
> > scanner book says EGR valve position sensor, Pressure feedback EGR (PFE)
> > sensor, or EGR Pressure transducer-signal voltage too low. This does NOT
> > appear to be the almighty EGR trouble code that all SHO members have at
> some
> > time in the past.
> >
> > Based on past experience, any thoughts on this??
> >
> > Thanks
> > Bob