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.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.What the best way yo fix my problem

[teampro687]

Mine did the same thing to me a couple of times. I found out that if I shut the car off and turned it back on that it would somehow reset something and it would work fine again. I read somewhere that by shutting the car off that I reset the computer and that's why it would work again. I'm not sure what it was for sure but I'm swapping a manual in now so I won't have to worry about it anymore. Good Luck.

[darkeagle]

I would do a 5spd. swap that way you won't have to worry about it going out and costing you big bucks to fix it. Then you don't really know if the mechanic will really fix it right or not b/c he'll be after the money he's making to fix it for you.

5spd. swap is somewhat easy but its a pain in the *** to do. In the long run though its worth it unless you want to just stick with the automatic and just fix it everytime it quits on you. Wish you luck on your finding.

[NISTECH]

have you checked the wiring from the sensor to the TCM? maybe somethings unpluged or shorted out.

[NISTECH]

further note. putting a new/used trans in may not fix the problem since you are still getting the code all thats left is the wiring. Therefore if you do the engine trans swap and use the old harness it may still have the same problem. If you junk it for that think of the time and effort you have put into the car so far,Are you gonna throw that away?? The dealer option may not be big bucks they might be able to figure it out with in 1 hours diagnostic time. The repair might be pricey but at least you would know what it was and decide weather you want to do it yourself.

[jjup_99]

I check all the wiring to the sensor from the tcm. There continuity all the way to the harness.I talk to a couple of teacher at my school they said it could be the wire terminal pin. The resistance of the sensor is 256 ohms. Now last time i checked it i had 0.02 ohms at the harness.

[NISTECH]

that kind of resistance in the 2 wires for the sensor is ok. is it still throwing the code??? Another thing to check with shift problems is the TPS setting and function. you need to moniter how it sweeps. the trans uses this to determine when to down shift and upshift as well.

[jjup_99]

Code will not go away. I'll try anything, but if it was the tps wouldn't the computer kick out a code for both the revolution sensor and the tps. As the wire leads to the sensor I lose resistance. The resistance should stay the same from the sensor,if their in the same circuit.

[CanadianCoch]

I have a spare s13 automatic transmission in KC. Do you know how to put one in?

Dr.

[NISTECH]

not nessesarily ,but codes usually associated with tps failure are P073x codes on OBDII cars. not typically revolution sensor codes. But could be possible on OBDI cars. Test the TPS see if its registering right.

[Turb0wned]

sell it and get manual

[jjup_99]

I found a 92 240sx for 500 bucks, manual transmission, dohc. my 89 only a sohc and the transmission is stuck in limp mode. anything i need to know about the engige and transmission crossover. For 500 I get the engine,manual transmission and stock 240 rims.

Alldata says the harness to my revolution sensor should have three terminals an that the resistance should be 500-600 ohms between 1-3. none between 1-2 2-3. My sensor only has 2 terminals, the resistance is 256 ohms. Now I check the procedures for the year before mine and after, thinking i got a older or newer sensor.

(CanadianCoch how much you want for the trans.)

[Dutch]

I have a 93/auto and it was doing the same thing about 4 times per week, it would also rev way too high between gears even when off the pedal a bit. transmission mechanic said it is common in Nissan aotos after 100k. I have no problems since mine was rebuilt, no sensors were changed, all repairs were done mechanically