my car wont go into overdrive

2000 HYUNDAI ACCENT
170,000 MILES
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DAVIDRIEWER
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my car drives and shifts poerfect. but it wont go into overdrive or lockup. i unplugged the trans. speed sensor and the car started shifting early and starts out in third gear unless i downshift it manually. i plugged the sensor back in, now it shifts fine except.. no overdrive. the light on the dash is working. but a while back, if the shifter wasnt exactly in a certain spot, it wouldnt go into o.d. unless i shook the gearshift back and forth a little . the light would go off and it would go into o.d. but now it doesnt.
Jun 16, 2012 at 7:08 PM
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RASMATAZ
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-Scan the TCM for codes/s
Jun 16, 2012 at 7:31 PM
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DAVIDRIEWER
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okay, i had the computer scanned and no codes. now is there a seperate computer for the transmission?
Jun 16, 2012 at 8:53 PM
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RASMATAZ
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TCM- ( Transmission Control Module )
Jun 16, 2012 at 10:33 PM
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DAVIDRIEWER
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there is no tcm
Jun 18, 2012 at 4:09 PM
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RASMATAZ
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Scan the computer for code/s, also check fluid level, and throttle and cable adjustments

Disconnect electrical connector for overdrive switch and note switch terminal identification. See Fig. 16 . Overdrive switch is mounted on driver's side of gearshift lever.
Depress overdrive switch to ON position. Using DVOM, ensure continuity exists between terminals No. 4 and 5. Depress overdrive switch to OFF position. Ensure continuity exists between terminals No. 5 and 6. Replace overdrive switch if continuity is not as specified.

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Jun 18, 2012 at 8:10 PM