help code 1740
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help code 1740
well here we go again first want to say thank you for everyones help on fixing code 401 and code 153. now thw light came on this morning . I had it checked and it was throwing a 1740 code. this is a 99 f150 4x4 4.6 auto with 160,000 miles. I bought it mainly for a hunt vehicle. I need to drive it next week to georgia about 250 miles. It will stay there and i will use it during hunting season then i must drive it back. I think that code 1740 is a transmission code and do not need to have tranny problems on the road. Again thanks for all your help.
Lead Driver
Joined: Sep 2006
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CODE 1740 a PCM detected no current signiture change from the TCC circuit between the PCM and the TCC solenoid on the valve body in the transmission.
It can be the wire harness to the outside of the trans, the wire harness on the bottom of the valve body, or the solenoid it'self is stuck.
Testing at the transmission outside connector for good circuit resistance will tell you if the problem is in or out most of the time but wont tell if it is stuck unless it is operated by test from outside.
To get at the solenoid, the pan is drained and taken down to expose the valve body, the harness and the solenoids. There are about 6 solenoids so you will have to get a location chart to find it's location.
I think at this time you should go to a shop and have them check it and do the job right then if needed to get you on the road.
However if there is a lot of debris in the pan, the fix will not be cheap or fast.
You could drive the truck without lockup , just that the trans will run a little warmer from the normal slip that will occurr and somewhat less fuel mileage.
Good luck.
It can be the wire harness to the outside of the trans, the wire harness on the bottom of the valve body, or the solenoid it'self is stuck.
Testing at the transmission outside connector for good circuit resistance will tell you if the problem is in or out most of the time but wont tell if it is stuck unless it is operated by test from outside.
To get at the solenoid, the pan is drained and taken down to expose the valve body, the harness and the solenoids. There are about 6 solenoids so you will have to get a location chart to find it's location.
I think at this time you should go to a shop and have them check it and do the job right then if needed to get you on the road.
However if there is a lot of debris in the pan, the fix will not be cheap or fast.
You could drive the truck without lockup , just that the trans will run a little warmer from the normal slip that will occurr and somewhat less fuel mileage.
Good luck.
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thanks blue grass. Today it is fine, transmission is shifting good. I am hoping that the silenoid was just stuck.it only seemed like it was slipping one time. The rpms were higher than normal for the speed I was traveling. I have not droped the pan. Seems like every vehicle i do this to that has a lot of miles on it the tranny usually quits. I did drain the torque converter and put the required fluid in.
Lead Driver
Joined: Sep 2006
Posts: 7,907
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Good to hear it cleared and hope it was only stuck.
As a side note, I was told by a reliable source that the PCM has the ability to' BUZZ' the solenoids to try and clean them when a temp sticking condition is detected.
A check of program and code charts shows that many parts of the system are monitored by inductive signiture means and can detect these operational faults and try certain things as well as set codes to that effect... Example is code P1240 for an internittant injector circuit.
Good luck.
As a side note, I was told by a reliable source that the PCM has the ability to' BUZZ' the solenoids to try and clean them when a temp sticking condition is detected.
A check of program and code charts shows that many parts of the system are monitored by inductive signiture means and can detect these operational faults and try certain things as well as set codes to that effect... Example is code P1240 for an internittant injector circuit.
Good luck.
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Freshman User
Joined: Apr 2007
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Had the P1740 code on my 1999 w/ 167k. It came in shortly after a tranny service. I verified fluid level and reset the code twice to ensure it was a 'hard' code. I inquired with the guys at the local dealer parts counter and they thought it was a pretty common replacement part. They even showed me in the valve body where it was at in thier computer drawing. Although it looked simple, the tranny is not something I am comfortable digging around in. I walked over to the service dept and got a price. Approx $60 for the TCC solenoid and another $210 to get me out the door. They quoted 1.8 hours for labor. I have a feeling it was a 45 minute job. None the less, for a mere $270 I was out the door.
Since I paid the full $270, I figured I would try to glean some information for you guys before departing the dealership for the day. I had the trans guy dig out my old TCC solenoid and it is actually pretty simple. From the looks of it a single screw holds it into the valve body. There are a couple o-rings on it for it to snap into the valve body. You can see the copper coil that controls the solenoid. There is a simple two pin connector. I suspect the copper coil is what died (open???).
Since I paid the full $270, I figured I would try to glean some information for you guys before departing the dealership for the day. I had the trans guy dig out my old TCC solenoid and it is actually pretty simple. From the looks of it a single screw holds it into the valve body. There are a couple o-rings on it for it to snap into the valve body. You can see the copper coil that controls the solenoid. There is a simple two pin connector. I suspect the copper coil is what died (open???).
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