1998 Mercury Villager service engine soon light

Tiny
PRP2298
  • MEMBER
  • 1998 MERCURY VILLAGER
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 125,000 MILES
Service light came on, had checked out. Showed transmission was bad. Had transmission rebuilt byaamco, light came back on. They replaced solenoid and valve body as that was what code showed, light came back on. Light comes on when driven at highway speeds for a short time, 15 to 20 minutes, then slow down. Light comes on when you go to speed up again. Any ideas?
Tuesday, May 12th, 2009 AT 8:37 AM

26 Replies

Tiny
PRP2298
  • MEMBER
  • 15 POSTS
Code that shows is P0744
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Tuesday, May 12th, 2009 AT 8:49 AM
Tiny
KHLOW2008
  • MECHANIC
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Hi prp2298,

Thank you for the donation.

Here is a description of the problem and diagnostic procedures.

DTC P0744/1107: TCC SOLENOID VALVE
Circuit Description
DTC is set when improper shifting to 4th gear position or improper torque converter clutch operation is detected. Problem is NOT caused by electrical failure of A/T circuits but by mechanical failure. Control valve sticking, improper solenoid valve operation, malfunctioning oil pump or torque converter clutch etc.


https://www.2carpros.com/forum/automotive_pictures/192750_DTCP0744Repair98Villager_1.jpg

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Tuesday, May 12th, 2009 AT 10:42 AM
Tiny
PRP2298
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All of this has been done. Trans. Had a full rebuild, including solenoid and valve bedy, the solenoids and valve body were replaced again, same problem every time. Light was coming on in same fashion, ie driving conditions before trans rebuild. Any other ideas?
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Tuesday, May 12th, 2009 AT 10:53 AM
Tiny
KHLOW2008
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Were you able to erase the DTC prior to testing?

In your 1st post,

" Light comes on when driven at highway speeds for a short time, 15 to 20 minutes, then slow down. Light comes on when you go to speed up again. "

Does the above mean the light went off and came back ON?

Something could have been missed out during the rebuild.
Were the oil pump and torque converter clutch checked?

Were the line pressure tested?
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Tuesday, May 12th, 2009 AT 11:18 AM
Tiny
PRP2298
  • MEMBER
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Light comes on after driving at highway speeds then slowing down and speeding up again. It does not go out and come back on. Converter clutch was replaced, line pressure all shows normal. Any way this can be a faulty sensor? I am $2800.00 in to this, would like to fugure it out.
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Tuesday, May 12th, 2009 AT 11:27 AM
Tiny
PRP2298
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  • 15 POSTS
Should also mention that when light comes on no difference in drivability is noticed. Shifts through all gears, including overdrive crisply and with no hesitation. Have noticed that when shifting from park overdrive off light comes on untill tapping button on end of shift lever.
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Tuesday, May 12th, 2009 AT 11:57 AM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
A faulty sensor would cause other codes to appear and since you are not gettiing any other codes, that should not be the cause.

The OD light coming on when shifting out of P could mean a fault in the OD circuit or switch.

Maybe you can try a manual code retrieval to see if there are any codes stored. I am not able to upload the codes charts now as there seems to be some problem with my connections and will do so later.


https://www.2carpros.com/forum/automotive_pictures/192750_TCMOBD99Villager01_1.jpg

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Tuesday, May 12th, 2009 AT 12:21 PM
Tiny
PRP2298
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No codes stored. No drivability issues, suggestions? Open to anything.
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Tuesday, May 12th, 2009 AT 12:30 PM
Tiny
KHLOW2008
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You mentioned SES light showing and no codes stored?

No driveability issues?
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Tuesday, May 12th, 2009 AT 12:35 PM
Tiny
PRP2298
  • MEMBER
  • 15 POSTS
Shows P0744, no others. When light comes on, stays on, there are none changes whatsoever in drivability. Tranny shifts fine through all gears. P0744 is Torque Converter Clutch Circuit Intermittent on list. Clutch was replaced in rebuild.
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Tuesday, May 12th, 2009 AT 12:40 PM
Tiny
KHLOW2008
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I seem to be running out of options.

From the data available to me, P0744 does not necessarily mean the torque converter clutch alone. It mentioned improper shifting to 4th or improper clutch operations.

As you do not have shifting issues, the torque converter clutch should be the cause as it involves only very minimal shifting and might not be noticeable.

Were those parts replaced new or used?
There could be the possibility of a faulty torque converter.
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Tuesday, May 12th, 2009 AT 1:23 PM
Tiny
PRP2298
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Replaced new. Maybe just a faulty part.
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Tuesday, May 12th, 2009 AT 1:33 PM
Tiny
KHLOW2008
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I would be doing additional research on this and would try to get back to you asap.

Meanwhile I will post it in the moderators forum to get additional technicians involved to try to solve this problem for you.
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Tuesday, May 12th, 2009 AT 2:09 PM
Tiny
PRP2298
  • MEMBER
  • 15 POSTS
Thank you, anything will be greatly appreciated.
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Tuesday, May 12th, 2009 AT 2:14 PM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Hi
Been follow your posts got an idea what might be going on. Need to know if you did the TCM selfdiagnoses test and did long pulse occure in flash #7?
Let me know
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Wednesday, May 13th, 2009 AT 9:23 AM
Tiny
PRP2298
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Seems there was long pulse, any ideas?
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Wednesday, May 13th, 2009 AT 10:35 AM
Tiny
KHLOW2008
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Which of the following conditions described the pulse that you are getting?


https://www.2carpros.com/forum/automotive_pictures/192750_TransDTC98Villager01_1.jpg



https://www.2carpros.com/forum/automotive_pictures/192750_TransDTC98Villager02_1.jpg



https://www.2carpros.com/forum/automotive_pictures/192750_TransDTC98Villager03_1.jpg



https://www.2carpros.com/forum/automotive_pictures/192750_TransDTC98Villager04_1.jpg

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Wednesday, May 13th, 2009 AT 11:42 AM
Tiny
PRP2298
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Overdrive off light is not flashing. Sometimes comes on when shifting into gear, goea off with tap to button on end of shifter. Overdrive off function works well at all times, even when service soon light is on.
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Wednesday, May 13th, 2009 AT 11:49 AM
Tiny
KHLOW2008
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You need to go into TCM diagnostic modes to get the OD light to flash.

Refer to previous replies I made.
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Wednesday, May 13th, 2009 AT 12:46 PM
Tiny
DOCFIXIT
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You did the test and there was a long flash on seventh pulse. If yes then there is a hard part failure in trans ie convertor, solenoid, oil pump, ring seals on input shaft damaged during rebuild. Hope you got a warrenty because it needs to come back out and problem found.
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Wednesday, May 13th, 2009 AT 1:31 PM

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