Automatic Trans Will Not Shift

[jjup_99]

My automatic tansmission on my 89 nissan 240sx will not shift out of 1st. Hits 5000 rpms at 30 mph. I ran a self diag on the trans to nissan repair manual specs. Pulled a code for a revolution sensor. Sensor Tests out find. But the specs say if the sensors test out there is no problem to run sef diag again. But still won't shift.

[TrunkMonkey]

when was the last time you changed the oil and filter?

-demetrius

[NISTECH]

the revolution sensor may be what the tcm is using to determine engine speed and when to shift gears. maybe its a harness issue. have you done a conversion?

[jjup_99]

every thing is stock ecept for the exhuast(N1 apexi cat-back). I put a new revolution sensor, and replace the tcm. No conversions yet! I went to the dealer and one of the old tech's told me to test the dropping resistor. so I look up the specs on how to test it. test out fine.