02 Xterra with Crazy Overdrive - Nissan Xterra Forum
 
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#1 Old 11-23-2012, 06:39 PM
eric_koski
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02 Xterra with Crazy Overdrive

02 xterra auto, 110k miles. Recent problem with Overdrive. On the hiway after driving for 25 minutes or more the trans will downshift out of OD and then upshift back. This happens repeatedly,. You can watch the tach drop and rise as it occurs. I have checked for codes (none) and checked the trans self diag. (all blinks are the same). Fluid has been changed with no help. This only occurs when the truck gets HOT/NEVER COLD. I`m thinking maybe a sticky solenoid? Any ideas?? Next step is to drop the pan. Anybody have a good source for a solenoid pack?
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#2 Old 11-27-2012, 11:55 AM
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02 Xterra with Crazy Overdrive

New wrinkle....CEL with PO744 TC Lockup
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#3 Old 11-27-2012, 06:50 PM
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The P0744 is set when the A/T cannot perform lock-up even if electrical circuit is good. engine-codes.com

The Torque Converter Clutch (TCC) solenoid valve is activated, with the gear in Drive, by the Transmission Control Module (TCM) in response to signals sent from the vehicle speed and the Engine Control Module (ECM).
Lock-up piston operation will then be controlled. When the torque converter clutch solenoid valve is activated, the torque converter lockup clutch will engage creating a 1 to 1 RPM ratio between the transmission input shaft and the rotational speed of the torque converter.

Lock-up operation, however, is prohibited when A/T fluid temperature is too low.

When the accelerator pedal is depressed (less than 2/8) in lock-up condition, the engine speed should not change abruptly. If there is a big jump in engine speed, there is no lock-up.

When the a transmission solenoid is working intermittent, in most cases the problem is not the electrical part of the solenoid; the problem is foreign material obstructing the mechanical function of the solenoid or the flow of the fluid through the transmission valve body. If the transmission fluid is very dirty, it is recommend changing the transmission fluid and if possible removing the transmission pan for further diagnosis. Excessive debris or metal particles on the transmission pan could be an indication that there is a transmission mechanical failure and that the transmission will need to be rebuilt or replaced.

Read more: http://engine-codes.com/p0744_infini...#ixzz2DTi9zK00

Possible causes
- Faulty torque converter clutch solenoid valve
- Torque converter clutch solenoid valve harness or connectors
- Torque converter clutch solenoid valve circuit is open or shorted
- Low transmission fluid level
- Dirty transmission fluid

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Last edited by ShiftingSkys; 11-27-2012 at 06:55 PM.
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#4 Old 11-27-2012, 08:53 PM
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Looks like I gotta drop the pan. Thanks for the info.
Any source for solenoids besides the dealer? Big bucks from them.
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#5 Old 11-27-2012, 09:04 PM
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Try rock auto and courtesy parts

2002 Super Black 5 Speed 4x4
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#6 Old 02-21-2014, 02:14 PM
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Hello,

Go to Amazon, look up up KREX GRAPHITE OIL ADDITiVE

Use this in your engine and add some to your differential after you fixed your tranny issue.

Thank me later.
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#7 Old 02-21-2014, 02:18 PM
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After your tranny issue...

After your tranny issue...

Get a motor oil change for your truck and add KREX GRAPHITE OIL ADDITIVE

You can find it on AMAZON.COM

It will run about 60 bucks for 6.

You can also ad some to your rear differential.

It is liquid graphite.

Thank me later..

XTERRA OWNER of 4 different Xterras.

NOTHING IS MORE DANGEROUS TO THE ADVENTUROUS SPIRIT OF A MAN THAN A SECURE FUTURE
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