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neutral position switch is to let the computer know when you are in neutral, via transmission Lets say you are cruising at 40 mph and you see the light turn red up ahead, throw in in neutral and coast to a stop. Normally through the drive train the engine would be forced to be at a higher RPM as the wheels and trans and flywheel still are all moving at about 35 mph now. The sensor I guess is supposed to force the RPM back down to idle. IDK if it's for emissions or gasmilage, but I THINK that's the point of it.
Quote:
Originally Posted by unijabnx2000
does anyone have the wiring schematics("blueprints") for the b13 sensors and the b15 sensors?
yeah thats exactly what the neutral switch is for, it lets the computer know that you put it into neutral, for example next time you drive your car and you are coming to a stop from say 40mph leave the car in a gear and just coast to a stop with the clutch pushed in and notice where your rev is at. come to a stop and i guarantee your rpm's will be higher than normal idle. mine is usually around the 1600rpm range, then take it out of gear when your stopped and watch the rpm go down to what its suppost to be. works every time, haha.
Thanks for all the help in this thread. I'm almost done doing this swap on my son's '94 SE-R. We scored a P11 with limited slip from a salvage yard 16 miles from home. They didn't know it had limited slip, they thought it wasn't. Having trouble finding the left axle seal now. I don't want to put the drive axles in with old seals. The speedo plug won't fit the '01 trans from the '94 harness. I went to another junk yard and found a '01 Sentra with an auto trans and cut the plug off that and it fits the P11. Just have to solder the wires together there. I think the speedo sensor is in the top of the trans above the right axle area, a black plastic thing. Is that right? The rpm sensor looks like it's screwed into the bell housing directly on the front of the trans so it must pick up the flywheel spinning? The b13 trans we took out I think has the rpm sensor in the bottom of the trans near the end of the bellhousing. Looks like the reverse switch on a P11 is located near the left (when installed in car) end of the trans on top. Then there is a blue switch screwed into the bottom of the trans kind of below where the left driveaxle comes out that I'm guessing is the neutral switch. Am I mixed up on that and the reverese light?
I also had to grind away the edges of a steel block that is welded on the underside of the clutch arm near where the cable attaches on top of the trans. The arm would not pivot without that block being ground off on the edges. One edge hit the case/bell housing. The other end hit the vent tube. I took pictures showing that but can't find them on my computer now.
yeah not sure which is which, but I think i'm gonna just put a jumper between the contact points, and if my reverse lights come on, i've got the right one... i'll put ignition on leave in reverse and see what switch puts them on
just use a multimeter and shift the trans around, that'll tell you which is which.
as for wiring them, I just unsoldered the pigtails from my B14 trans and re-wired them to the prongs on the B15 trans. I sealed them up with the grommet from the pigtail and some silicone
It would be nice if somoene *ERM* Greg *COUGH LOUDLY* could look up and see which cars use the same reverse/neutral switches so we could be huting for a number of cars, and not just one!
Lets say you are cruising at 40 mph and you see the light turn red up ahead, throw in in neutral and coast to a stop. Normally through the drive train the engine would be forced to be at a higher RPM as the wheels and trans and flywheel still are all moving at about 35 mph now. The sensor I guess is supposed to force the RPM back down to idle. IDK if it's for emissions or gasmilage, but I THINK that's the point of it.
