Code 452
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Postmaster
Joined: Dec 2007
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From: Jacksonville FL
Code 452
Just pulled codes. Been having alot of trans issues lately.
Got a 452. Thats it.
"Computer detected an error in the VSS or PSOM signal during the last 80 warm-up cycles."
Got a 452. Thats it.
"Computer detected an error in the VSS or PSOM signal during the last 80 warm-up cycles."
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Postmaster
Joined: Dec 2007
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From: Jacksonville FL
I have pulled it and cleaned it about 7 times since these trans problems.
Checked it with multi meter today and it read 1.34 ohm.
Checked it with multi meter today and it read 1.34 ohm.
Fleet Owner
Joined: Oct 2005
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From: Kentucky
Does the speedometer fluctuate as well? many times it can be a bad RABS module pulling down the VSS signal. I do recall reading a post from subford where the VSS output should be in the 3.5 -4.0 volt range when the speedometer indicates ~30 MPH. That was from memory, I suggest you search a few of his posts.
That would be the best place to start. If the signal is low remove the connector from the RABS, see if the signal level increases. If it does then you know it's not a VSS or PSOM caused problem.
If the signal is good, then I would start leaning towards a PSOM problem.
That would be the best place to start. If the signal is low remove the connector from the RABS, see if the signal level increases. If it does then you know it's not a VSS or PSOM caused problem.
If the signal is good, then I would start leaning towards a PSOM problem.
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Postmaster
Joined: Dec 2007
Posts: 3,052
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From: Jacksonville FL
Does the speedometer fluctuate as well? many times it can be a bad RABS module pulling down the VSS signal. I do recall reading a post from subford where the VSS output should be in the 3.5 -4.0 volt range when the speedometer indicates ~30 MPH. That was from memory, I suggest you search a few of his posts.
That would be the best place to start. If the signal is low remove the connector from the RABS, see if the signal level increases. If it does then you know it's not a VSS or PSOM caused problem.
If the signal is good, then I would start leaning towards a PSOM problem.
That would be the best place to start. If the signal is low remove the connector from the RABS, see if the signal level increases. If it does then you know it's not a VSS or PSOM caused problem.
If the signal is good, then I would start leaning towards a PSOM problem.
Thanks for the help. Ill try that. I send ya some reps.
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Postmaster
Joined: Dec 2007
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From: Jacksonville FL
Well its back.... After $2400 worth of trans work its slamming gears again.
Code 452.
RABS sensor is fine.
Unplugged RABS module. Same if not worse.
Whats next?
New PSOM? (if I can find one)
New RABS module?
New computer? (if I can find one)
Run new wiring to the sensor in case some are bad?
So frustrated with these trans problems..
Code 452.
RABS sensor is fine.
Unplugged RABS module. Same if not worse.
Whats next?
New PSOM? (if I can find one)
New RABS module?
New computer? (if I can find one)
Run new wiring to the sensor in case some are bad?
So frustrated with these trans problems..
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Senior User
Joined: Apr 2011
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From: pittsburgh pa
I was having the same issue with my 94 150 a few months ago, kept shifting hard and throwing code 452 I tried everything mentioned so far. Ended up pulling a psom from boneyard and it fixed it cost me 45$
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Postmaster
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From: Jacksonville FL
Truck is now wanting to stall in reverse.
Slams in reverse then idle surges bad and then stalls out. Only does this when warm.(25 miles to work then backing into parking spot) When cold it does not stall in reverse.
Any test I can do to determine if its the PSOM, RABS module, or computer thats causing the issue. Id rather not guess and dump a ton of money into something I didn't need.
Slams in reverse then idle surges bad and then stalls out. Only does this when warm.(25 miles to work then backing into parking spot) When cold it does not stall in reverse.
Any test I can do to determine if its the PSOM, RABS module, or computer thats causing the issue. Id rather not guess and dump a ton of money into something I didn't need.
Fleet Owner
Joined: Oct 2005
Posts: 20,789
Likes: 1,753
From: Kentucky
Have you checked for codes since this new issue started? The most likely cause is a gummed up or bad IAC. Pull it off and inspect/clean it. Have you pulled the PCM and opened it up to see if there are any signs of leaking capacitors or burn marks?
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Postmaster
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From: Jacksonville FL
Don't think its an IAC issue. It never did this until the trans was rebuilt last week.
Yes still only getting the 452 code.
I have not pulled the PCM yet. But was planning on it when I get time.
Ill pull codes again and clean IAC anyways.
Been really busy at work so I don't get off in time to really do much. Plus only day off is Christmas
Thanks
Yes still only getting the 452 code.
I have not pulled the PCM yet. But was planning on it when I get time.
Ill pull codes again and clean IAC anyways.
Been really busy at work so I don't get off in time to really do much. Plus only day off is Christmas
Thanks
Fleet Owner
Joined: Oct 2005
Posts: 20,789
Likes: 1,753
From: Kentucky
Don't think its an IAC issue. It never did this until the trans was rebuilt last week.
Yes still only getting the 452 code.
I have not pulled the PCM yet. But was planning on it when I get time.
Ill pull codes again and clean IAC anyways.
Been really busy at work so I don't get off in time to really do much. Plus only day off is Christmas
Thanks
Yes still only getting the 452 code.
I have not pulled the PCM yet. But was planning on it when I get time.
Ill pull codes again and clean IAC anyways.
Been really busy at work so I don't get off in time to really do much. Plus only day off is Christmas
Thanks
My truck wants to stall when put in reverse
This may or may not be accompanied by irraddic idle and/or codes. If no codes are found pull the IAC (Idle Air Control) sensor and clean/replace as needed.
Here is an IAC cleaning writeup
http://www.fullsizebronco.com/forum/...t=IAC+cleaning
Another potential problem is that the transmission filter may have dropped into the pan. This is easy enough to fix. Remove pan, reinstall filter, fill with fluid.
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Postmaster
Joined: Dec 2007
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From: Jacksonville FL
Thought about the filter falling but wouldn't it do it all the time and not only when warm?
Pulled codes again and only got the 452.
Thanks for the link though. Think Im just going to take it to Ford.... I know they are going to rape me but I don't really have any other choice.. I actually can say I have more money than time for once in my life....
Pulled codes again and only got the 452.
Thanks for the link though. Think Im just going to take it to Ford.... I know they are going to rape me but I don't really have any other choice.. I actually can say I have more money than time for once in my life....
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Where is the RABS MODULE LOCATED ON 351W?
Where is the RABS MODULE LOCATED ON A 351W.