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Old 05-14-2012, 10:48   #1 (permalink)
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Transmission issue

The rig:

The boss's 2005 Lincoln Navigator 87,XXX miles

The problem:

After sitting overnight, it will stick in a gear that isn't 1st and you have to give it lots of throttle to get it to move. (his words: it won't get out of it's own way) Something that he just mentioned is that some nights he parks it so he has to back out of the driveway and sometimes it is parked so he drives out of the driveway. When he backs out of the driveway, it sticks in a higher gear.

Also, it will shift hard 2-3. Not a clunking shift, but not smooth. Then 3-4 comes in within 1.5 seconds after that shift (may be normal, IDK) 4-5 is like silk and 5-6 is normal.

It has never done this before.

The recent work done:

Drained out the three quarts of oil, changed the filter, refilled with three quarts of Mercon SP. Brought trans up to temp with scanner reading temp and checked oil level. Changed engine oil and differential oil.

The codes:

P0736 Reverse ratio mismatch.

The procedure so far:

Checked for codes, Checked TR switch after it gets to the shop and all switches hit. have not checked them running, but it moves fine now.

The procedure tomorrow:

Park the rig so it has to be backed out in the AM. Hook up scanner and look for something, but I don't know what.

The questions:

WTF Mate? Did the transmission reset adaptations? With the scanner, it says that it doesn't have adaptations, but I don't trust things like that.

Is it sticking in reverse electronically?

Are there any suggestions on further testing?
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Old 05-16-2012, 21:37   #2 (permalink)
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Re: Transmission issue

OBDII Code P0736 FORD - Incorrect Reverse Gear Ratio | Engine-Codes.com
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Old 05-16-2012, 21:50   #3 (permalink)
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Re: Transmission issue

Quote:
This diagnosis monitors actual gear position by checking the torque converter slip ratio calculated by Transmission Control Module (TCM) as follows:

Torque converter slip ratio = A x C/B

A: Output shaft revolution signal from revolution sensor
B: Engine speed signal from Engine Control Module (ECM)
C: Gear ratio determined as gear position which TCM supposes
So We have an electrical signal for the transmission.

We have an electrical signal for the crank sensor

We have a supposition of the gear that it thinks it should be.

That sounds like it could be an electrical problem, but the issue only came up immediately after the fluid drop and fill.

The latest report from the boss's wife is that all is well but it's been parked inside recently so maybe that changes things?
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Old 05-24-2012, 09:13   #4 (permalink)
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Re: Transmission issue

It was getting worse so the boss and I did more searching, him on his computer, me on mine.

All of a sudden, he got out of his desk and I walked towards his office with something to say. We both found the same information - from different sources - that the engine must be running when checking the oil.

I'm shaking my head sadly...
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Old 05-24-2012, 10:00   #5 (permalink)
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Re: Transmission issue

Glad you found the answer. Thanks for the update.
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