odometer no workie (searched already) ATTN: NISTECH

[solo2racer]

i searched topics under "odometer" and i read all of the posts that were found. They helped me out, but im a lil confused on one issue still.

ok the car is a 93 240 coupe with analog cluster. My speedo works fine, but neither the tripometer or the odometer works.

I took the cluster apart and found the gearing for the trip/odometer to be fine, when i spin the worm gear off of the servo motor- all of the other gears/numbers of the odo/tripometer assy work and move.

So- for some reason the servo motor is not turning. the wiring/connectors all seem clean and intact.

I read in the searched posts, some say the ODOMETER ASSEMBLY needs to be replaced and some say the SPEEDOMETER ASSEMBLY needs to be replaced. In fact one of the most helpful posters NISTECH actually gave both answers, in two different but similar posts. Is there any way i can narrow this down further to choose one or the other to replace?

again- analog cluster, 93 240 base model.

part numbers would also be appreciated if anyone has them=) thanks!!

-steve

[Rosco]

I'm starting to have odometer probs along with some speedo probs as well (90 fastback). Sometimes when accelerating my speedo will stick and a second later it'll shoot up to where it is supposed to be (happens every now & then). My odometer and trip od has just stopped at 60305 and 3044.....I'm gonna head to the nissan dealer to see what they say. I'll let you know what happens and I'll make sure to speak with the mechanic and get specifics about why and how-to fix without replacing everything....

[silkk]

Whatever happed to Nistech anyways??

[bcar240]

if the numbers turn when you spin the gears than the odometer is fine mechanically. we need to figure out the reason the servo isn't turning. Now it could be either a bad servo, a bad speedometer, or (unlikely) a bad gauge cluster. If the speedo works, it is most likely either the servo or the speedo unit. I had a nearly identical problem, my odometer would only work occasionally but it just eventually just stopped. I worked on it for a couple nights and it started working again when I replaced the speedo unit and left the original odometer and servo in there. To determine if the servo was turning, I hooked up the cluster when it was apart and put a mark on the servo gear and drove around to see if it was spinning. Kind of hard to drive with the column dropped and the cluster out, but I got tired of hooking everything back up to test it after a few times. Probably you found so much different advice because many times the poster hasn't been able to rule out certain problems off the bat like you did with the odometer gearing.

[solo2racer]

i tried to test the servo motor that spins the odometer gears.im not really knowledgeable with electronics, but my dad is. he hooked a volt meter (measuring ohms) up to the black wire, all the way to the right of the servo's connector. Neg to that, then pos to other wires. 2 showed resistance. then we hooked the neg of the voltmeter to the next wire to the left from the black one (on the connector) yellow i beleive. and tested resistance vs the other wires of the harness. We found there to be resistance b/w all of the leads. which would suggest the coils (windings) inside the motor are in tact. the motor should be ok. If zero ohm resistance is found nothign on the meter, that would suggest a broken winding and a bad motor. So in my case it LOOKS like i just need the speedo assembly, although my speedo works- it seems to not be sending the signal to the odometer servo motor. So there may be a problem in the curcuit board of the speedo assembly. i'm gona try and tell you guys how it goes.

-sp

[bcar240]

that is exactly what my problem was. My servo was good, something got screwed in the speedo electronics.