P1451 indicates an electrical concern with the EVAP vent control valve
circuit... It is important to avoid confusing this with any "leak detected"
codes to avoid unnecessary diagnosis time. Possible causes are limited to
the elctrical circuits that control the valve (wiring, solenoid, power,
ground, or even the PCM).
FWIW, OBD2 codes are common across all makes/models.... that is to say that
these generic codes all mean the same no matter what we are working on.
I am not in the US but I believe that the 80,000 mile EPA warranty period
for emissions critical components also comes with a 5 year codicil... worth
checking out all the same.
On Feb 29, 11:59 am, Jerry.PeruMot...@gmail.com wrote:
> Hey all-normally a 'chevy' guy by trade but have a friend with a ses
> lite on. Scanned it and it shows a 1451 code-powertrain specific. I
> don't have any cougar books and thought I'd ask all the experts in
> this forum. The driver also stated a studder/slight drive ability
> issue. As stated it's an 02 Couger with 50k miles and a 2.5. Thanks
> in advance for any info-thanks for reading! JP
The definition for P1451 is (EVAP) control system vent control valve
circuit malfunction. This might be something as simple as a bad gas
cap or leaking hose in that system. Just for your information, in the
US the emissions system on cars are covered under warranty for I
believe 70 or 80,000mi. except for the CAT. which is considered a
normal wear and tear item. I could be wrong about this but worth
checking out.
The drivabilty issue could be as simple as a dirty MAF sensor.
Sometimes they can be cleaned and work well for a long time and
sometimes not!
maf
Jerry.PeruMotors@gmail.com - 01 Mar 2008 12:37 GMT
> P1451 indicates an electrical concern with the EVAP vent control valve
> circuit... It is important to avoid confusing this with any "leak detected"
[quoted text clipped - 31 lines]
>
> maf
Let me start by saying...Thanks both Jim and toolnut(rick) for your
responses. After posting, I came back to this site an hour or two
later, saw no responses and went back to the vehicle and re-scanned.
It's a p1451 but there is also some freeze frame data-for this
particular vehicle(ford-as stated, not my specialty-have a tech 2 as I
do mostly GM). Looked at the freeze frame data searching for any info
and found something that I thought interesting. This Auto x-
ray(decent back-up tool for me) shows limited info but....186 degrees,
closed loop, 2100 rpms at this point and.....18 miles per hour! What
do you think about this??Tranny slip? Speed sensor report issue?
This tool, I believe, will not post each wheel speed to narrow down a
possible sensor issue. Also, putting the cart ahead of the horse, if
a slight tranny slip, per a well trusted tranny expert I know, had a
96ish crown vic at one time with a tranny shudder, added GM rear diff.
additive and it corrected this issue immediately(and for years-car
still on the road going fine)...I will drive this vehicle today-check
tranny fluid-level and report back any findings. Sorry for the long
post but again...thanks for any info!
Kruse - 01 Mar 2008 15:21 GMT
On Mar 1, 7:37 am, Jerry.PeruMot...@gmail.com wrote:
I came back to this site an hour or two
> later, saw no responses and went back to the vehicle and re-scanned.
> It's a p1451 but there is also some freeze frame data-for this
> particular vehicle(ford-as stated, not my specialty-have a tech 2 as I
> do mostly GM).
Probably not related to your problem, but take the VIN of your car to
a dealer
and check to see if there was a fuel pump/gas filler tube recall on
your particular
vehicle. There was one on some Cougars of that era, just not sure that
it affected
your car. If your car is affected, it could save you about $400 and a
two-man
PITA job and if you are real lucky, the cause of your code. (But I
doubt it)
Jim Warman - 01 Mar 2008 18:07 GMT
The thing to do now would be to perform the KOEO On Demand self test to see
if the fault is currently there. If the code is in memory only, it may be a
sign of a loose connection somewhere in the circuit. Freeze frame data is
basically what the conditions were when the code was set in memory. 2100
rpms and 18 mph? I'd guess that the car was accelerating from a stop when
the code was set... I certainly wouldn't try to infer any trans concerns
from an EVAP code....
For the diveability concern... I'd drive the car and attempt to see if this
was a misfire or some other running problem. If your scan tool can access
Mode 6 data, you should find a group of misfire counters that may help with
that concern. I would also check the basics.... fuel pressure (while
driving - not sitting in the bay), ignition system, perhaps look for signs
of MAF contamination (though this will usually give idle/low speed driving
concerns more than anything).
ToolNut - 01 Mar 2008 18:32 GMT
> The thing to do now would be to perform the KOEO On Demand self test to see
> if the fault is currently there. If the code is in memory only, it may be a
[quoted text clipped - 11 lines]
> of MAF contamination (though this will usually give idle/low speed driving
> concerns more than anything).
Jim, Thanks for the great class on troubleshooting, I learned
something today. I did take the palm of my hand and hit my forehead
while saying DUH!! when I read your post. Your right about it being
more electrical in nature.
Rick
Jim Warman - 01 Mar 2008 19:26 GMT
Glad to help.... I've spent nearly 40 years smacking myself on the forehead
trying to keep up with technology. It's been a hell of a ride, so far...