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post #1 of 26 (permalink) Old 10-24-2010, 05:43 PM Thread Starter
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P1747 - What Next???

97 T-Bird, 4.6, 63K, original owner.

Check Engine light came on. OBD showed 2 codes, both P1747. After doing some research here, I decided to start with the internal wiring harness (soft harness, white connector). Still had the same problem... 2 codes, P1747.

I checked the external wiring harness and the two wires that go to the EPC seemed OK... no corrosion on the connectors and no resistance.

Decided to change the EPC. While I was in there, I changed the 1-2 and 2-3 accumulator pistons and springs (went with stock parts, since I always liked the smooth shift on this car), and installed a sonnax pressure regulator valve.

Still have the same problem... 2 codes, both P1747.

What do I do next? Should I keep looking for problems inside the tranny (MLPS, or one of the other solenoids)? Or am I set with the new harness and EPC?

I'd like to check the wiring harness that goes from the tranny to the computer, but I have no idea which leads to test. Does anyone have diagrams of the pin layouts for the two ends of the harness?

Last edited by grumpy_steven; 10-25-2010 at 10:26 AM.
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post #2 of 26 (permalink) Old 10-25-2010, 08:57 AM Thread Starter
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Just tinkered with the old EPC. I gave it some juice from a 12V battery. I would expect to see some sort of movement (looks like there's a shaft inside), but nothing happens. It makes a popping noise, but I don't see anything moving.

What should happen when power is applied to the EPC? I'd like to figure out if this unit is bad and was part of my problem.
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post #3 of 26 (permalink) Old 11-10-2010, 06:02 PM Thread Starter
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Still having no luck with this.

The problem went away for a little while, but it's back again.

I isolated the two EPC wires at the PCM connector and connected a volmeter while driving. The hot lead was pretty consistently ~13.5V when the car was working and also when the O/D light was flashing. The return lead was a different story... when the car works, the return starts out with ~10.4V and as the car warms up, it gradually drops to ~9V. Now that it's acting up again, the voltage is all over the place, dropping to ~9V and spiking to ~13.5V. I'm guessing the voltage spike is what causes the O/D light to flash.

I'm starting to think that the tranny is fine, but the PCM has a problem. Can anyone confirm my suspicion or tell me what else to check?

Anybody have a good PCM for sale (part #F7SF-12A650-BB)? Not looking to spend a lot, since I have no idea if it will solve the problem.

Are there any other PCM part numbers that will work on this car (97 T-Bird 4.6)?
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post #4 of 26 (permalink) Old 11-10-2010, 06:12 PM
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Quote:
Originally Posted by grumpy_steven View Post
Still having no luck with this.

The problem went away for a little while, but it's back again.

I isolated the two EPC wires at the PCM connector and connected a volmeter while driving. The hot lead was pretty consistently ~13.5V when the car was working and also when the O/D light was flashing. The return lead was a different story... when the car works, the return starts out with ~10.4V and as the car warms up, it gradually drops to ~9V. Now that it's acting up again, the voltage is all over the place, dropping to ~9V and spiking to ~13.5V. I'm guessing the voltage spike is what causes the O/D light to flash.

I'm starting to think that the tranny is fine, but the PCM has a problem. Can anyone confirm my suspicion or tell me what else to check?

Anybody have a good PCM for sale (part #F7SF-12A650-BB)? Not looking to spend a lot, since I have no idea if it will solve the problem.

Are there any other PCM part numbers that will work on this car (97 T-Bird 4.6)?
This place has one F7SF-BB for $69 under stock number CCT095 listed on car-part.com:
http://www.mrautosalvage.com/

Good luck with it!

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post #5 of 26 (permalink) Old 11-10-2010, 06:15 PM Thread Starter
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Wow... great site. Thanks for the tip.

What's the difference between F7SF-12A650-BB and F7SF-12A650-AB? Are they interchangeable?

Last edited by grumpy_steven; 11-10-2010 at 06:39 PM.
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post #6 of 26 (permalink) Old 11-10-2010, 08:16 PM
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The variation in the last two digits designates the catch code. FTE0, FTE1, MBE1,2,3, NPL2 and NPL3 are all interchangeable for 96/97s.

I cannot, however, offer any other insights into your problems.

-Brandon
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post #7 of 26 (permalink) Old 11-10-2010, 09:25 PM Thread Starter
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The variation in the last two digits designates the catch code. FTE0, FTE1, MBE1,2,3, NPL2 and NPL3 are all interchangeable for 96/97s.

I cannot, however, offer any other insights into your problems.
I appreciate any help. I'm not sure this will solve the problem, but it seems like I should be looking outside of the tranny for the problem.

Sounds like I can use the part from any 96 or 97 with a 4.6. I found a good deal on the ECU from a 96 Cougar (part # f6sf-12A650-Ac)... will this work?
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post #8 of 26 (permalink) Old 11-12-2010, 03:57 PM Thread Starter
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OK... swapped the ECU and it looks like the problem is solved. Car was acting up right before the swap and worked perfectly right after. I'll have to drive it a few times to be sure, but I think this is it.

FYI - original ECU was F7SF-BB (LJC1); replacement ECU is F6SF-DB (NPL1).... seems to work without a problem, even though a few parts sellers said it wouldn't work unless it was an exact replacement.
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post #9 of 26 (permalink) Old 11-13-2010, 01:05 AM
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It's just slightly different calibrations. You are actually running a California tune now.

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post #10 of 26 (permalink) Old 04-29-2011, 07:51 AM
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If my original PCM has a dyno tune on it, and i need to replace it, how would i go about that? does it have to be dyno tuned? or can i reburn the dyno tune file into the new pcm?

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post #11 of 26 (permalink) Old 05-03-2011, 04:51 PM
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If you have a programmer, return the current PCM to stock and then tune the new PCM. This assumes you have some vehicle changes left on the device.

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post #12 of 26 (permalink) Old 05-03-2011, 05:16 PM
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Also assuming that the programmer was also initially used to flash the current tune to the vehicle, of course.

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post #13 of 26 (permalink) Old 05-04-2011, 06:54 AM
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i got an Xcal2, tuner used that to load the dyno tune into the PCM....xcal says 5 tunes left!

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post #14 of 26 (permalink) Old 05-04-2011, 09:29 AM
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To grumpy steven what exactly was the problem that you was having with the trans. I am having a problem where it won't shift past 1st and i would have to shut off the car and then when i restart it works normally. Is this the problem that you were having?
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post #15 of 26 (permalink) Old 08-03-2011, 10:45 PM
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what is the EPC you guys are talking about? my car is throwing a p1747 code now, but no flashing OD light. I may buy a new computer this weekend to try. But want to know what the EPC is so i can check it. Search feature doesn't show any results for EPC.

Edit: I found out what it is, but now where is it? I am having trouble figuring out where it is. I found the tranny article and it helped a lot. i just need to know where it is in case I have to replace it.

Last edited by fordfreak300; 08-03-2011 at 11:01 PM.
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post #16 of 26 (permalink) Old 08-04-2011, 06:17 AM
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Drop the trans pan, it's attached inside a recess above the fluid level to the side of the worm tracks in the transmission case near the 1-2 accumulator. It doesn't attach to the valve body; the last connector in the trans harness terminates at it.

-Brandon
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post #17 of 26 (permalink) Old 08-04-2011, 11:28 AM
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Thank you! I am going to have to check it as well as my computer. My issue started when I jumped the alt fuse one night to get home. I am sure I fried something because the check engine light came on after I jumped the blown fuse. I know it wasn't the best thing to do, but I was stuck and needed to get home. I put a new alt on the next day. I do get a ceck engine light with p1747 however my OD ligh does no flash. The OD switch is currently not hooked up in my shifter handle though. I need to fix those wires. I will try to find a 94 bird or cougar in the yard this weekend and grab another computer. Never hurts to have a spare laying around in case that's not the problem. If not I guess I will drop the pan and put I. A new EPC and do my jmod a little sooner than I had planned.
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post #18 of 26 (permalink) Old 08-04-2011, 11:37 AM
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I can't edit my above post on my phone so I had to make a new one. My car is a 94 cougar 4.6 but has a 96 tranny in it. My dad said he did not change any of the electronics in the tranny 2 years ago when he changed it out. Any idea what computers are compatible in a 94?
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post #19 of 26 (permalink) Old 08-04-2011, 01:24 PM
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Quote:
Originally Posted by fordfreak300 View Post
My dad said he did not change any of the electronics in the tranny 2 years ago when he changed it out.
Well that's a problem right there. Whenever you swap out to a different year transmission, you have to at least use your original TCC solenoid and MLPS.

-Brandon
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post #20 of 26 (permalink) Old 08-04-2011, 04:47 PM
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It seems to have worked ok for the las 2 years but I had planned on changing them back to 94 pieces anyway. So that will definatley be handled with the everything in the tranny as well as a jmod. Any idea though what computers are compatible with 94. I notice you posted above the 96-97 computers that were all interhangable. If it isn't my computer I like to have an extra known working computer on hand in case I ever need to rule that out anyway.
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post #21 of 26 (permalink) Old 08-04-2011, 04:53 PM
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I don't know the list of catch codes or differences between the 94/95 PCMs, one of the tuners here might chime in with that information. When in doubt, try to find a like replacement with an identical catch code. In this case, one from a 94 or possibly 95 4.6.

-Brandon
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post #22 of 26 (permalink) Old 08-04-2011, 05:00 PM
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That i will do. I just though of another question though since my tranny has all 96 internals can I switch to a 96-97 computer and be fine ? Or are there other differences? Also 1 last question do the computers that aren't the Cali tune give more performance? My buddy has a 96 and if we could get a better computer in his car that would be awesome! what would the catch codes for non Cali 96-97 be? Sorry for so many questions. I work Long hours and am going to have basically 2 days over the weekend to do everything. I have to be 100% ready before I start.
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post #23 of 26 (permalink) Old 08-04-2011, 05:02 PM
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I seem to recall there being differences between the 94-5 harness and electronics and those in the 96/97 that would make the swap difficult. Not impossible, just time consuming. Talk to XR7-4.6 about that one; he's done the swap.

The strategy between computers isn't going to affect performance in any measurable way, so don't waste your time looking for one to "improve performance" over another. If you're after more performance from the computer, find a reputable tuner in your area or get in touch with Lonnie at BOC.

-Brandon
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post #24 of 26 (permalink) Old 08-04-2011, 08:39 PM
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Thanx for the info. I will not worry about trying to find a computer for my friend then. As for mine I will try to pull it out tonight and check the catch code and match it. I am assuming it is located in the passenger side behind the kick panel like the mustangs?
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post #25 of 26 (permalink) Old 08-05-2011, 07:28 AM
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Correct, pull the plastic kick panel after removing the plastic fastener and remove the black foam padded sound insulation the same way. After that it's a small nut holding a bracket onto the right corner of the PCM and the 10mm bolt holding on the harness.

-Brandon
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98 Black Mark VIII 160k, stock daily driver
07 Redfire Fusion V6 SEL 178k, for the wife
Gone but not forgotten: 96 Mark VIII, 94 Cougar XR7, 93 Mark VIII

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post #26 of 26 (permalink) Old 08-06-2011, 08:41 PM
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I finally found that 7mm nut hiding in the right corner. I got a new computer and the car seems to really like it. The code did come back once, I cleared it and then it never came back again.
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