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Unread 12-04-2009, 09:47 AM   #1
for_givn
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Join Date: Mar 2009
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Automatic transmission wont shift automaticly

My automatic transmission wont shift automatically, It is stuck in Overdrive unless I shift it manually from 1st to 2nd to drive. Manually shifting is fine and no problems with the tranny but when left in drive when i start to drive it is in overdrive and I have to drop it in 1st and manually shift it as I drive. Anyone know why? It is a 1992 Jeep 4.0.


Last edited by for_givn; 12-04-2009 at 10:06 AM.. Reason: more info
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Unread 12-04-2009, 10:14 AM   #2
598BBC
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1995 YJ Wrangler 
 
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Possibly the TCM.. Transmission control Module, located behind the glovebox, I had a similar problem and that was the cause.. there is a way to test it, you will have to search the forums for it.. hope this helps.
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Unread 12-04-2009, 12:28 PM   #3
CJ7-Tim
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Most likely cause is the Throttle Position Sensor (TPS), especially if you recently crossed any deep water, ran a mud pit, or washed the engine. Test the TPS.

TPS Test

You should have 5 volts going into the TPS. At idle, TPS output voltage must be greater than 200 millivolts. At wide open throttle (WOT), TPS output voltage must be less than 4.8 volts.. The best is to use an analog meter (not digital) to see if the transition from idle to WOT is smooth with no dead spots. With your meter set for volts, put the black probe on a good ground like your negative battery terminal. With the key on, engine not running, test with the red probe of your meter (install a paper clip into the back of the plug of the TPS) to see which wire has the 5 volts. One of the other wires should show .26V (or so). The other wire will be the ground and should show no voltage. Move the throttle and look for smooth meter response up to the 4.49 at WOT.

Perform the test procedure again and wiggle and/or tap on the TPS while you watch the meter. If you notice any flat spots or abrupt changes in the meter readings, replace the TPS.
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Unread 12-04-2009, 06:01 PM   #4
cruiser54
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Do the 1992s have the TCU fuse taped up under the passenger side dash like the older models? If so, check there.
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