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SES light just came on

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  #1  
Old 10-23-2012 | 06:41 PM
nadylime's Avatar
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Drifting
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Default SES light just came on

My SES light just came on - everything still runs good, no noticeable difference in how the Disco drives.

Got the codes ran....they are as follows:
- 741
- 1590 (the three amigos are lit up - related?)

I would appreciate any input from you folks.

Thanks!
 
  #2  
Old 10-24-2012 | 09:39 AM
nadylime's Avatar
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A quick update - I did some research on the P0741 code and it seems to be related to the transmission?

I had the transmission serviced (fluid/filter replaced) about 1,000 miles ago & the transmission is running perfectly....no hard shifting, revving, slipping, stalling when downshifting, etc.

Any suggestions as to what this might be?

Thanks.
 
  #3  
Old 10-24-2012 | 09:52 AM
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741 is the torque convertor circuit is stuck closed, nothing you can deal with. It may go away, but chances are you will need to go to a tranny shop and see what they say. Don't do anything with out getting back to us first with the estimate.
 
  #4  
Old 10-24-2012 | 10:02 AM
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P0741 * Torque converter lock-up clutch fault

I'd be inclined to take it back to the tranny service shop and have them resolve it on their nickle. Type of fluid used, quantity replaced, filter O ring, these things could make quite a difference.

From shop manual:

Torque converter lock-up
The EAT ECU energises the lock-up solenoid valve to engage the lock-up clutch. Lock-up clutch operation is dependent on throttle position, engine speed, operating mode and the range selected on the transfer box.


and - it is not possible to check torque converter lockup while the vehicle is stationary,

Attached are pages from the RAVE shop manual. Average DIY for tranny filter replace, replace O-rings, don't re-use old ones, don't tear or twist them. If you are more determined, or if the tranny shop needs it, there are also pages attached to get to the lockup solenoid. May just be they need to unplug and replug the electrical cable connection to tranny. Also note that you must fill tranny until fluid runs out.


1590 is part of the 3 Amigos. Separate problem.
 
Attached Files
File Type: pdf
d2 tran oil fill.pdf (567.0 KB, 71 views)
File Type: pdf
d2 tran lockup solenoid.pdf (417.7 KB, 81 views)
File Type: pdf
d2 tran valve body.pdf (1.14 MB, 77 views)
File Type: pdf
D2 tran filter.pdf (418.0 KB, 87 views)
File Type: pdf
D2 tran gasket.pdf (644.3 KB, 68 views)
  #5  
Old 10-24-2012 | 10:13 AM
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Mike, buzz I had a truck brought to me recently with p0174 and several other codes urned out to be a junk after market mass air flow sensor. Have you two experienced this before? I put in a Bosch and all codes cleared up!
 
  #6  
Old 10-24-2012 | 10:23 AM
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This is not going to be a fluid/service issue, this is electrical.
 
  #7  
Old 10-24-2012 | 10:24 AM
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What is the service history of the transmission??
Fluid ever been changed??

Changing fluid may not help a torque convertor lockup condition - but then it may.

If the frictional components of the fluid in your transmission are way off, then the torque convertor lockup clutch was not designed for that.

If you put in clean fluid and Lukas Stop slip as Mike recommends, then
you may get lucky with the torque lock problem.

You may also want to trace the wiring and make sure any electrical
connections to the transmission are free of dirt or salt.

The act of engaging the torque clutch is probably a few amps at 12 volts.

make sure the FUSE for this current is in good condition and is seated in the fuse block well.
 
  #8  
Old 10-24-2012 | 10:45 AM
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Here's a pix of the electrical, just above lip of tranny pan, right where they could pinch it, poke it, break it, skin it, etc. The convertor lock up solenoid is the gray with orange (Slate Orange) wire on pin "M".

Also notice that tranny pan might be cleaner than your shop left it.
 
Attached Files
File Type: pdf
c0243.pdf (422.0 KB, 112 views)
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