2000 4x4 reman p0741 after install
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From: lexington
2000 4x4 reman p0741 after install
I have a 2000 ranger 4.0 4x4 just installed at reman 5r55e did Pretrip and test drive. Shift thru gears fine started cruise speed and it started going in and out of overdrive then gave code p0741 tcc stuck off or performance waiting on warranty department but I know it’s old truck could I have broken wire or something any suggestions
Welcome to the forum
TCC is the electric version of a mechanical version to Lock the internal clutch of a torque converter to match engine RPMs, like when you let out the clutch pedal on a manual transmission the engine and transmission RPMs are now "locked" together, this is why manual vehicles get better MPG, always.
This lockup increases MPG by at least 50% in automatics, so a very good thing, but still can't get to manual trans MPG, lol.
All torque converters have an internal clutch that will lock when enough pressure builds up, torque converter ATF circulates to and from the transmission.
Adding a TCC solenoid on transmission fluid passage to/from torque converter allows computer to build up or release pressure in the torque converter to cause it to lock up or unlock as needed.
p0741 means engine RPMs and transmission RPMs are not locking together when they should, computer can read both
yes, could be TCC ground wire is bad externally or internally
All the transmission solenoids get 12volts with key on, computer has a separate ground wire for each one.
A solenoid is just a coil of wire, so if you put 12volts IN to one contact of the solenoid then you will get 12volts OUT of the other contact, very very slight drop, i.e. 12.6v IN "might" read 12.5v out
So computer can "see" if a wire is disconnected, i.e. no 12v from TCC Ground wire at the computer
This would generate code P0770-TCC circuit problem
So the code a computer does NOT USE is as important as the code it does use
So this will be a mechanical issue, assuming a new torque converter then it would be the solenoid can't seal the passage enough to Lock torque converter when computer tells it to
Torque converter would still lock up at speed but computer would still set that code because it is not locking when it is "told to"
TCC is the electric version of a mechanical version to Lock the internal clutch of a torque converter to match engine RPMs, like when you let out the clutch pedal on a manual transmission the engine and transmission RPMs are now "locked" together, this is why manual vehicles get better MPG, always.
This lockup increases MPG by at least 50% in automatics, so a very good thing, but still can't get to manual trans MPG, lol.
All torque converters have an internal clutch that will lock when enough pressure builds up, torque converter ATF circulates to and from the transmission.
Adding a TCC solenoid on transmission fluid passage to/from torque converter allows computer to build up or release pressure in the torque converter to cause it to lock up or unlock as needed.
p0741 means engine RPMs and transmission RPMs are not locking together when they should, computer can read both
yes, could be TCC ground wire is bad externally or internally
All the transmission solenoids get 12volts with key on, computer has a separate ground wire for each one.
A solenoid is just a coil of wire, so if you put 12volts IN to one contact of the solenoid then you will get 12volts OUT of the other contact, very very slight drop, i.e. 12.6v IN "might" read 12.5v out
So computer can "see" if a wire is disconnected, i.e. no 12v from TCC Ground wire at the computer
This would generate code P0770-TCC circuit problem
So the code a computer does NOT USE is as important as the code it does use
So this will be a mechanical issue, assuming a new torque converter then it would be the solenoid can't seal the passage enough to Lock torque converter when computer tells it to
Torque converter would still lock up at speed but computer would still set that code because it is not locking when it is "told to"
Thread Starter
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Joined: Apr 2015
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From: lexington
Welcome to the forum
TCC is the electric version of a mechanical version to Lock the internal clutch of a torque converter to match engine RPMs, like when you let out the clutch pedal on a manual transmission the engine and transmission RPMs are now "locked" together, this is why manual vehicles get better MPG, always.
This lockup increases MPG by at least 50% in automatics, so a very good thing, but still can't get to manual trans MPG, lol.
All torque converters have an internal clutch that will lock when enough pressure builds up, torque converter ATF circulates to and from the transmission.
Adding a TCC solenoid on transmission fluid passage to/from torque converter allows computer to build up or release pressure in the torque converter to cause it to lock up or unlock as needed.
p0741 means engine RPMs and transmission RPMs are not locking together when they should, computer can read both
yes, could be TCC ground wire is bad externally or internally
All the transmission solenoids get 12volts with key on, computer has a separate ground wire for each one.
A solenoid is just a coil of wire, so if you put 12volts IN to one contact of the solenoid then you will get 12volts OUT of the other contact, very very slight drop, i.e. 12.6v IN "might" read 12.5v out
So computer can "see" if a wire is disconnected, i.e. no 12v from TCC Ground wire at the computer
This would generate code P0770-TCC circuit problem
So the code a computer does NOT USE is as important as the code it does use
So this will be a mechanical issue, assuming a new torque converter then it would be the solenoid can't seal the passage enough to Lock torque converter when computer tells it to
Torque converter would still lock up at speed but computer would still set that code because it is not locking when it is "told to"
TCC is the electric version of a mechanical version to Lock the internal clutch of a torque converter to match engine RPMs, like when you let out the clutch pedal on a manual transmission the engine and transmission RPMs are now "locked" together, this is why manual vehicles get better MPG, always.
This lockup increases MPG by at least 50% in automatics, so a very good thing, but still can't get to manual trans MPG, lol.
All torque converters have an internal clutch that will lock when enough pressure builds up, torque converter ATF circulates to and from the transmission.
Adding a TCC solenoid on transmission fluid passage to/from torque converter allows computer to build up or release pressure in the torque converter to cause it to lock up or unlock as needed.
p0741 means engine RPMs and transmission RPMs are not locking together when they should, computer can read both
yes, could be TCC ground wire is bad externally or internally
All the transmission solenoids get 12volts with key on, computer has a separate ground wire for each one.
A solenoid is just a coil of wire, so if you put 12volts IN to one contact of the solenoid then you will get 12volts OUT of the other contact, very very slight drop, i.e. 12.6v IN "might" read 12.5v out
So computer can "see" if a wire is disconnected, i.e. no 12v from TCC Ground wire at the computer
This would generate code P0770-TCC circuit problem
So the code a computer does NOT USE is as important as the code it does use
So this will be a mechanical issue, assuming a new torque converter then it would be the solenoid can't seal the passage enough to Lock torque converter when computer tells it to
Torque converter would still lock up at speed but computer would still set that code because it is not locking when it is "told to"
No, it might cause "Ratio" code but not TCC no lock code
When TCC is locked then engine and trans(or rear axle) RPMs change at the same time, no delay like when you take off from stopped, engine RPMs increase faster than trans rpms as torque converter slips
To calculate accurate speed you need rear axle ratio, look here: Ford 7.5 & 8.8 Inch Axle Tag & Door Codes : The Ranger Station
Then go here: https://www.ringpinion.com/calculators/Calc_RPM.aspx
IF........you had a 4.10 ratio then your speedometer would be correct at 55mph in OD(5th) with 1,900 RPM
If you have a 3.73 ratio then speedo is about 5mph low, so you would really be going 60mph
When TCC is locked then engine and trans(or rear axle) RPMs change at the same time, no delay like when you take off from stopped, engine RPMs increase faster than trans rpms as torque converter slips
To calculate accurate speed you need rear axle ratio, look here: Ford 7.5 & 8.8 Inch Axle Tag & Door Codes : The Ranger Station
Then go here: https://www.ringpinion.com/calculators/Calc_RPM.aspx
IF........you had a 4.10 ratio then your speedometer would be correct at 55mph in OD(5th) with 1,900 RPM
If you have a 3.73 ratio then speedo is about 5mph low, so you would really be going 60mph
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From: lexington
Ok on the gear ration will be able to look at this tomorrow and hopefully have updates. Considering the way it seems to be going in and out of overdrive at cruise speed before the code is set that sounds like the solenoid? And thanks for the tech advice
The OD shift solenoid would be a different thing, and could be speed related
The 5R uses same solenoid for 2nd gear, 2nd gear is 1st gear with OD on
Computer uses preset engine RPM and Load, plus speed to pick the "best gear"
But it still shouldn't cycle back and forth between 4th and 5th, it should stay in 4th until cruising, no change in load/gas pedal, then shift to 5th for best MPG
The 5R uses same solenoid for 2nd gear, 2nd gear is 1st gear with OD on
Computer uses preset engine RPM and Load, plus speed to pick the "best gear"
But it still shouldn't cycle back and forth between 4th and 5th, it should stay in 4th until cruising, no change in load/gas pedal, then shift to 5th for best MPG
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