1997 explorer trans code 1744

billytkid0428 · October 25, 2005

I have a 97 exp 4.0 auto 5r55e truck runs great but check engine light is on so I can not get it inspected I pulled the codes and got a code 1744 tourqe converter problems I took it to the local ford dealer and he conformed the transmission was bad so I put another transmission in it drove 30 miles and the check engine light came back on pulled the code again and same code 1744. Trasmission shifts perfect tourqe converter engages and disengages just like it is suppose too. Thought it might be a ECM problem so I switched the orginal for one from the junk yard with matching numbers and still no luck.HELP

Blee1099 · October 25, 2005

Why did they replace the tranny for that OBDII code. That code, P1744, refers to the following: sticking or bad TCC solenoid inside the transmission.

billytkid0428 · October 25, 2005

ford said it was a internial problem so I replaced the transmission because I had axcess to one but i still get the same code the transmisson that i used only had 50,000 miles on it so i asumed it was good

Blee1099 · October 25, 2005

According to my OBDII chart its a sensor.. Ask Glacier991, our resident transmission expert.

billytkid0428 · October 25, 2005

how do i find glacier991

Blee1099 · October 25, 2005

Click on the following link, http://www.explorerforum.com/forums/private.php?do=newpm and enter in Glacier991 into the field and enter in a subject, etc..

billytkid0428 · October 25, 2005

thanks hope to hear from him soon

Glacier991 · October 25, 2005

1744 is a mechanically bad TCC stuck off code. (Not a standard OBD-II Code but proprietary, and those sometimes get reported wrong. My source for definition is a FORD manual.) Now the fact it is throwing that code MAY mean your TCC is stuck off, or it may mean there's a bad input fooling your PCM somewhere into thinking it is. You claim you have TCC lockup occurring normally, so I will accept that - but want to ask, did you use the same TC when you swapped trannies?

This is one where a breakout box and a transmission tester would really be helpful. Of all the transmission pinpoint tests, TCC may be the most extensive. (Pinpoint test C) It involves testing the cables to the PCM using the breakout box, and the transmission itself using the transmission tester. Your case would also call for pinpoint test J and M. One of those requires a New Generation Star Tester (NGS). That tests the TSS and OSS sensors.

Let's see what we "might" rule out. You swapped trannies and got the same code. So we know your internal harness, tcc solenoid etc is not to blame, or why did it do it with both trannies - unlikely they were both bad somehow - in EXACTLY the same way! (Don't bet on that!) I am uncertain how the computer derives a mechanically bad TCC unless it is relying on the output shaft speed sensor (OSS) and turbine shaft speed sensor (TSS) sensors (or something else) to see that the lockup is in fact occurring and in your case somehow fails to see that. However a bad sensor in those areas "ought" to show up with some other sensor related code. Puzzling.

I'll work on it a little, but I admit I am a little perplexed myself on this one. I'm guessing sensor somewhere somehow first, then cabling to the PCM 2nd.

ps. You just "happened" to have a 5R55E laying around? (swoon)

billytkid0428 · October 25, 2005

I did replace the tc i also put a new vss sensor in also the shift motor was bad 4x4 lights flashing so i put a different motor on and that fixed the problem (friends uncle rebuilds alot of exp so he let me have the tran and shift motor vss is new)

billytkid0428 · October 25, 2005

but he is stumped on the problem also

Glacier991 · October 25, 2005

that brings us to wiring. DO you have access to a breakout box ?

billytkid0428 · October 25, 2005

Glacier991 · October 25, 2005

Silly Q, but you DID clear codes?

Glacier991 · October 25, 2005

Did you reuse the old OSS on the side of the case ?

billytkid0428 · October 25, 2005

yes i cleared the codes by the way when i hooked my scaner up and whent down the road my scaner wouldn't display mph but on the freeze frame it did give me a mph

billytkid0428 · October 25, 2005

the only old sensor i used was the vss but like i said i put a new one of them on today i also seen where aldata said to do away with the drum speed sensor and splice the wires together and i have already done that

Glacier991 · October 25, 2005

If you reused the OSS, replace it. That is where my mind settles, without access to some other test tools... I hate trying to fix things by throwing parts at it, but I am thinking it has to be TSS or OSS, and the TSS is internal so was changed with the trannie.

Glacier991 · October 25, 2005

billytkid0428 said:
i also seen where aldata said to do away with the drum speed sensor and splice the wires together and i have already done that

Whoa, why didn't you say that? I am unaware that we can drop out the "drum speed sensor" (I believe that is the TSS sensor). Can you provide me that info? This is a new one on me. How long ago did you do that ?

billytkid0428 · October 25, 2005

i did it on the replacment because aldata showed a tsb on this and i found it also on this site dont know where because i have been all over this site i'm talking about the sensor on the top of case toward the engine i was told when you order a new case that there is no hole for this sensor

billytkid0428 · October 25, 2005

i found the message where i seen this it is HELP - '97 5R55E Automatic Transmission from gifriend i think the name is right i went to search and typed in drum speed sensor

1997 explorer trans code 1744

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