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Old 06-28-2006, 07:33 PM
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1993 Taurus Axod/E...MLP?

I have been getting two diagnostic codes on a 1993 Taurus GL axod/e transmission. When I do the procedure to set the manual lever position, and set the linkage for the OD position, I continue to get code 634 (Manual lever position sensor out of self test range). I'll swear that I'm doing it correctly. After dumping the other code 628 (excess converter clutch slip), and driving the car around, the 628 stays gone but 634 comes back. Even though I get some peculiar 3 to 4 shifts from time to time, the 628 stays gone for a considerable time and then eventually shows up.

Any clues on what might be happening would be appreciated. In the event that the converter clutch is actually slipping according to code 628, am I screwed to pull the transmission? Could there be some relatively simple reason for this which can be corrected short of pulling the motor/transaxel?

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Old 07-01-2006, 08:48 AM
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Not good...
The MLPS code may be caused by a bad switch. Very common failure.
The 628 TCC code is more troubling. You will need a scanner to determine if the TCC is not holding. Several internal trans problems will cause this issue. Do not fool yourself into believing a converter will fix this....
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Old 07-01-2006, 11:23 AM
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MPL Sensor/Lock-Up Solenoid Ckt Failure...

Hello Chazmac,
Thank you for the comments on the two codes. I changed the transmission filter yesterday and replaced 6 quarts of transmission oil. The internal cleanliness of the transmisson was quite good with just a light black film on the pan bottom. The inside of the filter was also quite clean. The magnet had some black fuzz on it but there was a distinct lack of obvious metal particles which have been abundant in other still functioning GM transmissions where I have changed the filters. This is the first Ford transmission with which I have any experience and I see lots of adverse comments about axod-e's and 3 to 4 troubles.

Where is the MPL sensor located on a 93 Taururs? One Aamco dude claimed that the MPL sensor code might be bringing on the other more troubling code 628 (Lock-up solenoid circuit failure).

awbazar
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Old 07-01-2006, 10:48 PM
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MLPS is located on the shifter linkage at the case. TCC codes can only occur if the PCM commands TCC on and it doesn't see corresponding RPM change and resulting steady state in trans. TCC may not function if MLPS is bad, but it would also not be commanded on...
Try MLPS, it is probably bad anyway...
If luck prevails, good for you...
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Old 07-02-2006, 05:54 AM
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MPL Sensor Location...

Hello Chazmac,
Thank you for the tip on the MPL location and how it works. That gives me a few things to try before Aamco gets into the act.

awbazar
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Old 07-02-2006, 07:27 AM
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Quote:
Originally Posted by awbazar
I have been getting two diagnostic codes on a 1993 Taurus GL axod/e transmission. When I do the procedure to set the manual lever position, and set the linkage for the OD position, I continue to get code 634 (Manual lever position sensor out of self test range). I'll swear that I'm doing it correctly. After dumping the other code 628 (excess converter clutch slip), and driving the car around, the 628 stays gone but 634 comes back. Even though I get some peculiar 3 to 4 shifts from time to time, the 628 stays gone for a considerable time and then eventually shows up.

Any clues on what might be happening would be appreciated. In the event that the converter clutch is actually slipping according to code 628, am I screwed to pull the transmission? Could there be some relatively simple reason for this which can be corrected short of pulling the motor/transaxel?
the mlps is supposed to be set with the trans in neutral..., there will be 2 marks to line up
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Old 07-02-2006, 07:12 PM
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MPL Sensor Adjustment...

Hello tnsmith10,
Thank you for the comment regarding the adjustment of the MPL sensor. After I was sure what the sensor was, I removed it and checked the contacts and variable resistor and found it to be in satisfactory condition. It had apparently been incorrectly set and not rotated to the neutral mark and secured.

I originally used the on-line procedure from the autozone.com web site and that posted procedure was incomplete. It only mentioned the adjustment of the cable to the crank arm to make the panel marks, P,R,N,OD,D, and 1 match the respective transmission detent.

After correctly setting the unit to the mark in neutral, I dumped the stored codes and ran the car and no longer got any transmission codes. Hopefully I will get no more codes, especially the one of most concern which was 628 (lock-up solenoid circuit failure).

awbazar
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