my 95 pathfinder has 2 problems. Please help MPH/TACH

[mustangmike1]

My tach only works untill it hits 2000 rpm and than falls to 0. And my speedometer only works tell it hits 30mph and than it falls to 0 also. But the milage counter works. Any ideas? Could it be the speed sensor? What what about the tach only going up to 2000 rpm than falling?

[RatioCynic]

The speed sensor is a good place to start. Remove the VSS from the transmission. Turn the sensor's pinion quickly and measure the voltage at the connector wire. Should be about 0.5V AC. RC

[rebeitler]

Ratio: What could cause a short in the speed sensor? My 2000 PFinder blows one every 4 months or so. I've noticed many other people in this forum with similar problems, I'm thinking this is a common problem...

[RatioCynic]

rebeitler,

Are you referring to the VSS thats built into the speedometer assembly [in your dash] or the VSS on your autom. transmission? The one in your dash is an auxillary unit to the revolution sensor on the A/T. Assuming you have an A/T. 2WD or 4WD?

Anytime there is a repetitive failure, I would first check the electrical system. Work backwards from the VSS which in this case is the wiring harness [look for possible shorts, clean all connections, spray connections with contact cleaner, inspect and test all relays]. PM me and I can provide you with a trouble diagnostic for the VSS and a wiring diagram. RC

[rebeitler]

Ratio: The speed sensor I'm talking about is located at the tranny. I didn't even know there was one anywhere else. I do know, however, when I replace the one at the tranny the problem is fixed for a few months or so. I will trace the wiring in an attempt to find the problem; I just wondered if this was a recurrent problem with Pathfinders. I've owned 4 Pathfinders and 5 pickups and never had this problem before...

[funnyfrog25]

The tach signal does not come from a speed sensor so I don't see that affecting your tach. Maybe cold solder joints or Tachometer resistor. Talk to the dealer for the resistor.