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Old 03-10-2008, 08:23 PM   #1
LBL300
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Default Codes p1779, p1791, and p0700 found

Changed the plugs with a friend over the weekend, and forgot to reconnect the tps sensor that he disconnected. Car ran rough, and then I found the problem, shut the car off, plugged in tps and all was fine. Until I started again and the light would not go out. First it was the SES light(yellowish engine picture), then it went out and the other light came on(yellowish car with a wrench inside). With that light on, the car shifted like it had a major shift kit(really hard). I shut the car off, waited about 10 sec, and restarted and the light was out. My wife was in the car and she said this second light has happened to her about 2 times before a few months ago. She did the same thing, shut the car off and it was fine.
No problems since, but I scanned the computer and it came up with p1779, p1791, and p0700 found. These are tranny codes, but what do they mean? It appears that there is no way to check the tranny fluid either, am I wrong?
Any help is appreciated.

Ken

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Old 03-10-2008, 10:19 PM   #2
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Default Re: Codes p1779, p1791, and p0700 found

Welcome to the Board.


Year model and engine are alway helpful.

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Old 03-11-2008, 07:06 PM   #3
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Default Re: Codes p1779, p1791, and p0700 found

Sorry, it's an '03 L300 with the V-6.

Ken

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Old 03-11-2008, 08:30 PM   #4
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Default Re: Codes p1779, p1791, and p0700 found

Can't find p0700, but p1779 and p1791 pointing to a communications problem between the ecm and pcm.

The ecm is mounted on the rear intake manifold, the pcm under the wiper cover on the passenger side.

Check foe loose or damaged connectors and cables.

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Old 03-11-2008, 09:19 PM   #5
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Default Re: Codes p1779, p1791, and p0700 found

P0700 is a code in the ECM that indicates that the TCM has requested the SES light on.
P1779 is an invalid engine torque code.
p1791 is an invalid accelerator pedal data from the ECM code.

If the problem is happening intermitantly then it may be a wiring or connection problem. The diagnosis for both code states to erase the codes and restart the egine. If the code come back immediatley then the TCM should be replaced. I would be checking the wiring in the systems and the connectors for porblems. It is doubtful that the TCM is the problem right now.


The trans fluid is checked by getting the trans up to operating temp and removing the 11mm plug on the passenger end of the trans (level surface)and seeing if the fluid is up to the level of the bottom of the hole. Best way to check that level is to pull the plug and in small amounts put fluid in the trans (plastic cap on the top of the trans) until it comes out. Let it stop flowing and reinstall the plug and the cap.

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Old 03-12-2008, 06:51 PM   #6
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Default Re: Codes p1779, p1791, and p0700 found

Cleared the codes 3 days ago, and no repeat of any of the codes. I'll check the wiring.

Thanks for the trans fluid info, do you know which side of the engine/trans that 11mm sight plug is on? (passenger rear, driver's front, etc?)

Thank you very much for the help!!!

Ken

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Old 03-12-2008, 07:41 PM   #7
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Default Re: Codes p1779, p1791, and p0700 found

Quote:
Originally Posted by ssicarman View Post
The trans fluid is checked by getting the trans up to operating temp and removing the 11mm plug on the passenger end of the trans

To be a bit more specific.
It is the only 11mm plug in the area. Look at the trans pan. Go to the end on the passenger side of the car. At the edge of it look up. With in 4-6 inches up from the pan is the plug.

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Old 03-12-2008, 10:27 PM   #8
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Default Re: Codes p1779, p1791, and p0700 found

The fluid must be checked with the engine running.


Inspect

The fluid level should be checked when the transaxle is near Room temperature or at 40C (104F) .

CAUTION: Removal of the fluid level screw when the transaxle fluid is hot may cause injury. Use care to avoid contact of transaxle fluid to exhaust pipe.

The engine must be running when the transaxle fluid level screw is removed, or excessive fluid loss will occur. Since the actual fluid level is unknown, stand clear when removing the fluid level screw. Have a container ready to capture any lost fluid.

WARNING: Do not turn the engine off with the fluid level screw removed as you can be injured by hot transaxle fluid being expelled out of the fluid check hole.



Let vehicle idle for three to five minutes with accessories off.
Apply brake
Move shift lever through all gear ranges, pausing three seconds in each range.
Place shift lever in Park. Important: Vehicle must be kept level on the hoist.
Raise vehicle on hoist.
Place oil container under fluid level screw.
Remove the fluid level screw with the engine running at idle.
Fluid level should be at the bottom of the fluid check hole. Because the transaxle operates correctly over a range of fluid levels, fluid may or may not drain out of the fluid check hole when the fluid level screw is removed. If fluid drains through the fluid check hole, this transaxle may have been overfilled. When fluid stops draining, the fluid level is correct and the fluid level screw may be installed. If fluid does not drain through the fluid check hole, the transaxle fluid level may be low. Proceed to ADDING TRANSAXLE FLUID.
Install fluid level screw. Tighten 12 N.m (106 lb in)
Lower vehicle.
Shut off engine. Adding Transaxle Fluid: With the engine running, add fluid at the vent cap location in half liter (1 pint) increments until fluid drains through the fluid check hole. Allow the fluid to finish draining through the fluid check hole.
Install fluid level screw. Tighten 12 N.m (106 lb in)
Lower vehicle.
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