Torque Converter Lockup Issues
Postmaster
Joined: Feb 2004
Posts: 3,266
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From: Levittown
Bill-X has found that some of the codes will change to warm sch after the
first full complete stop.
Bill
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Senior User
Joined: Jan 2008
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From: Fruitvale B.C.
OD lamp flash?
I would scan the TFT. Possible short or out of range.
If the TFT is showing to cold you will get the cold shift schedule.
Cold schedule in some PCM codes does not allow TC lock until fluid is warmed up some.
Also scan the TC lock to see if PCM sent the sig and the trans ignored for it for other reasons.
It could be locked just slipping. It will not slip code unless it slips while in OD.
Bill
I would scan the TFT. Possible short or out of range.
If the TFT is showing to cold you will get the cold shift schedule.
Cold schedule in some PCM codes does not allow TC lock until fluid is warmed up some.
Also scan the TC lock to see if PCM sent the sig and the trans ignored for it for other reasons.
It could be locked just slipping. It will not slip code unless it slips while in OD.
Bill
Powerstroked162... I was of the understanding that if the converter isn't locked then the motor side impeller will spin thus moving fluid against the tranny side impeler and thereby spin the driveline. Then when the converter is locked up, the impellers lock together creating a direct drive driveline?
There is no flashing tranny light and when I scan the truck there are no codes other than P1111 which is "Sys pass (No DTCs Available)"
Postmaster
Joined: Feb 2004
Posts: 3,266
Likes: 0
From: Levittown
The TFT was just a possible reason.
I would also check the TPS sig to the PCM. (.5 to 4 volts)
If the voltage is low you will not have the early TC lock (lower gear).
The lower gear TC lock is from a WOT.
First is to remove the tuner to rule it out.
Check your batt voltage and charging voltage after a restart.
Be shure your connections are good (+/-)
Bill
I would also check the TPS sig to the PCM. (.5 to 4 volts)
If the voltage is low you will not have the early TC lock (lower gear).
The lower gear TC lock is from a WOT.
First is to remove the tuner to rule it out.
Check your batt voltage and charging voltage after a restart.
Be shure your connections are good (+/-)
Bill
New User
Joined: Feb 2006
Posts: 18
Likes: 0
i dont know what mine is doing .if i drive normaly it starts shuttering around 30 mph and i half to kick the od off untill i hit 35-40 mph and kick it back on but if i put my foot into it.it does fine.im hopeing this is an easy fix bec i want to tow my car on a trailer from fl to ohio and back about 2,000 mile round trip next month. its a 93 f350 7.3 auto...doyou think its upforthe trip and what is up with the tranny
Thread Starter
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Senior User
Joined: Jan 2008
Posts: 130
Likes: 0
From: Fruitvale B.C.
The TFT was just a possible reason.
I would also check the TPS sig to the PCM. (.5 to 4 volts)
If the voltage is low you will not have the early TC lock (lower gear).
The lower gear TC lock is from a WOT.
First is to remove the tuner to rule it out.
Check your batt voltage and charging voltage after a restart.
Be shure your connections are good (+/-)
Bill
I would also check the TPS sig to the PCM. (.5 to 4 volts)
If the voltage is low you will not have the early TC lock (lower gear).
The lower gear TC lock is from a WOT.
First is to remove the tuner to rule it out.
Check your batt voltage and charging voltage after a restart.
Be shure your connections are good (+/-)
Bill
Thread Starter
|
Senior User
Joined: Jan 2008
Posts: 130
Likes: 0
From: Fruitvale B.C.
How would I know if there is a fault in the brake system? Just look at the lights and see if they are doing anything crazy or what?
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