Overdrive switch

Tiny
MDB240SX
  • MEMBER
  • NISSAN 240SX
When I bought my car (Nissan 240sx-1996-160k-2.4l4c) the AT shifter didn't have a shift button but the O/D off switch worked. I replaced the shifter but now I can't turn the O/D off. The switch on the new shifter is good. The electrical connector running to the shifter has 4 pairs of wires, 3 pairs have continuity and ~12v the O/D wires have no power (or continuity). How can I fix the problem
Tuesday, September 11th, 2007 AT 4:59 PM

7 Replies

Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
You went from a shifter without the button to one with it? Or did you simply replace the shifter with the exact same one and now the OD wont turn off? To start be sure you are using a part that is interchangeable with the one you removed, the manufacturers will make small changes from year to year
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Wednesday, September 12th, 2007 AT 11:35 AM
Tiny
MDB240SX
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  • 4 POSTS
I'm sorry. The original shifter was missing the shift button and I replaced it with the same part. Now I can't turn the O/D off. The switch on the new one checks out fine.
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Wednesday, September 12th, 2007 AT 1:24 PM
Tiny
2CARPRO JACK
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Oh you mean the shifter detent release button. Did you compare the new one to the old one?
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Wednesday, September 12th, 2007 AT 2:54 PM
Tiny
MDB240SX
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  • 4 POSTS
Yes, they're the same. I'm not getting power through the wires that lead to the O/D switch, the other wires in that same group are working fine.
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Wednesday, September 12th, 2007 AT 4:06 PM
Tiny
2CARPRO JACK
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  • 11,533 POSTS
This all worked before, coorect? Check all fuses, might have grounded something out replacing the shifter
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Wednesday, September 12th, 2007 AT 4:33 PM
Tiny
MDB240SX
  • MEMBER
  • 4 POSTS
I checked all of the fuses that deal with the AT, they're all good. When I removed the old shifter I expected there to be a lot of slack in the wires, because the replacement shifter had a long set of wires with it. There wasn't any slack (it was clipped to the body) so when I pulled the old shifter off it left the ends of those wires exposed. It could've shorted, I just can't find where to fix it. There is a silver box under the dash called the AT control, but I don't know what's inside and didn't want to risk messing it up further. My AT works fine it. Just accelerates like a slug.
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Thursday, September 13th, 2007 AT 10:32 AM
Tiny
2CARPRO JACK
  • MECHANIC
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If it accelerates slowly, then it could be the converter is locded up or prematurly locking up due to the wiring being wrong at the switch. Go to
https://www.2carpros.com/kpages/auto_repair_manuals.htm

There you will find th ewiring diagram for your car to verify the switch wiring is good and where it goes to
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Thursday, September 13th, 2007 AT 2:00 PM

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