Vehicle speed sensor problems

[S.hafsmo]

I've recently taken the car out of winter storage, and my first long trip has revealed some issues with the vehicle speed sensor. Intermittent loss of speedometer to begin with, but now it's mostly out all the time. This causes SES- and Service Ride Control lights, also loss of secondaries.

I'll get under the car today to check the sensor/connectors/wires, but are there any other known issues with this system?

I'm guessing the sensor is a MY 90 spesific, no longer available, and the later version uses a different signal?

[S.hafsmo]

Removed the sensor, and got a bit surprised by it being below the oil level in the transmission (messy business). Just held a rag in the hole while visually inspecting the sensor. Looked fine.

The vss was working before I tinkered with it, but not after. Came back after a few miles.

An interesting thing worth noting, is that it starts to function if I put a bit of load on the engine. High gear/high speed. Could it be that the twisting motion of the engine moves the wiring loom in such a way that a poor connection gets temporarily fixed? I haven't had time to check the loom yet.

[Demps]

Good info here:

http://www.zr1.net/forum/showthread.php?t=27414&highlight=Vss+gear

Ted

[S.hafsmo]

Thanks Demps, I've read that one. At least my gear is still in place. Wondering if I tugged the harness when I had the tranny out. Does the harness go straight to the ECM?

It seems the vss function is not load related, but speed. Above 50mph it usually pops back into life. Can I assume it generates higher voltage at higher speed?

Sent from my SM-T719 using ZR-1 Net Registry mobile app (http://r.tapatalk.com/byo?rid=90383)

[-=Jeff=-]

FYI, the later 91-95 VSS should work fine, you just need to change the connector on the harness..

[S.hafsmo]

Thanks Jeff. Are these still available? If the rear of the car is on ramps, should the sensor be above oil level?

[S.hafsmo]

Did some testing today, but I'm still left puzzled. There's no clip on the gear on these, yes?

VSS gives voltage depending on rotating speed, but as I don't have any comparison, I don't know how what voltage it should give at low speeds. Seems slightly unstable at slow rotational speed. 1.5V AC / 480 RPM.

Checked continuity of the cable by jumping the end terminal and measuring at the sensor connector. Yellow/purple cable. Shows 0 Ohm.

Still no result after re-connecting. 96969697969896999700

[S.hafsmo]

Don't know why the pics show twise. Uploaded through the app.

Edit, seems fine now.

[randy ransome]

I have a 95 ZR-1, the speedometer and odometer quit working. I bought a new VSS at NAPA Friday. It's made in America and appears to have the same markings as the original. Installed it Friday afternoon and drove to a car show. About 150 miles round trip. It worked Great all the way and I won #1 place in my class. :proud:

[HAWAIIZR-1]

I have a 95 ZR-1, the speedometer and odometer quit working. I bought a new VSS at NAPA Friday. It's made in America and appears to have the same markings as the original. Installed it Friday afternoon and drove to a car show. About 150 miles round trip. It worked Great all the way and I won #1 place in my class. :proud:



Hey Randy,
Congratulations!!
Do you mind sharing the Napa part # that works for a 95? When I researched it at RockAuto it shows a few different part numbers. I’m in the US right now and will get a Napa part if so. Thanks!

9703


Sent from my iPhone using ZR-1 Net Registry (http://r.tapatalk.com/byo?rid=90383)

[randy ransome]

Here you go.







:USFlag:

[HAWAIIZR-1]

Here you go.




:USFlag:

Thanks so much!!:handshak:

[Perry Mitchell]

Although I don't own a ZR-1, I do own several Corvettes and drive train from a '91 Z. The motor is in my '67 Camaro but please don't bash me. The car was totaled and so I am giving it a second life. My question is regarding the VSS. I know the gear ratio in the wrecked Z was 3:45 but it is now 3:70. The speed sensor that was in the 6 speed transmission was damaged and needs to be replaced. Here is where it gets interesting. The motor is now coupled to a 700R4 transmission. What speed sensor should I get and what should the colors of the drive gears be to match up with the present rear end ratio? The tire diameter is 27.2" according to Michelin. I joined this site years ago because of all the knowledge you members have . your advise is appreciated.

[WVZR-1]

Although I don't own a ZR-1, I do own several Corvettes and drive train from a '91 Z. The motor is in my '67 Camaro but please don't bash me. The car was totaled and so I am giving it a second life. My question is regarding the VSS. I know the gear ratio in the wrecked Z was 3:45 but it is now 3:70. The speed sensor that was in the 6 speed transmission was damaged and needs to be replaced. Here is where it gets interesting. The motor is now coupled to a 700R4 transmission. What speed sensor should I get and what should the colors of the drive gears be to match up with the present rear end ratio? The tire diameter is 27.2" according to Michelin. I joined this site years ago because of all the knowledge you members have . your advise is appreciated.

I believe that likely a drive of 15 and a driven of 41 or 42 would likely be an appropriate start. I don't believe that any other 'drive' could be made to work with that dimension tire. What type of instrument package. The Camaro was originally a cable drive. If the 700R4 is a conventional 'short-tail' there's maybe VSS available that can/will accommodate the cable drive and VSS signal ECM would like to see. Much more info is maybe needed.

[Perry Mitchell]

The speedometer is now electronic so no cable. The 700R4 has a conventional short tail. It now has a VSS installed but I don't remember what is driving it. It has a 2 pin oval connector but doesn't look anything like the original unit. Before I remove it I was hoping to know what colors the plastic gears should be.

[WVZR-1]

The speedometer is now electronic so no cable. The 700R4 has a conventional short tail. It now has a VSS installed but I don't remember what is driving it. It has a 2 pin oval connector but doesn't look anything like the original unit. Before I remove it I was hoping to know what colors the plastic gears should be.


Snapshot and info from your VSS - it could maybe be ID'd from info on it or PIC. They ain't all the same. It might be interesting to see which position on the output shaft the current drive gear is positioned in. 700R4 should have 2 positions available. Short shaft 'non-corvette' is generally thought to go in the first position. Is the current VSS 'center' pinned or is the connector on the perimeter?

Your VSS needs to accept 40 - 45 tooth driven gears. I can maybe ID what you've got.

15 tooth drive (gray) GM# 8642620 Retainer GM# 6261781

41 tooth VSS (yellow) GM# 25513048

42 tooth VSS (green) GM# 25513049

Does the car 'roll' now with the drive-line, tires wheels and weight close to final? I'd rather do a roll of the tire/wheel and use that dimension vs an advertised by tire guy.

[Perry Mitchell]

Thanks for helping me. The car is on a lift right now and will be for awhile. I didn't think the tire diameter was out of line. I don't really care how accurate the speedometer will be, just like it to be in the ballpark and allow the computer to play with the motor. The VSS in the car now is somewhat flat and black plastic with the connector off set. That is, not in the center.

[WVZR-1]

This wouldn't be correct for you but does your have the connector and retainer fabricated similar to this? Look on yours and see if there's info on yours where this one displays 10456092. Is your black center as well as black connector or maybe black center with white connector OR maybe white center and white connector.

This VSS is offset for the drive gear being installed on the rear most location on the output shaft (CORVETTE).

Pull yours and see what gear is on yours and I'd think likely you'll find a red 'drive' on the output shaft.

9731

[Perry Mitchell]

Thank you for your assistance. I have ordered a new vss from NAPA that will solve my problem.

[WVZR-1]

Thank you for your assistance. I have ordered a new vss from NAPA that will solve my problem.


Good to see you're good!! It's been interesting. If you'd share the link that you sent me to the car I believe these guys would enjoy it!!

-D

This fellows transmission was built with actually a reluctor wheel and different VSS. Very few 700R4/4L60 were done this way. His configuration was same as found on all of the e-transmissions. It's converted now to 15 tooth and appropriate driven.

[Perry Mitchell]

https://www.lateral-g.net/members/mitchell/. This is the link Dave was referring to. I didn't want to turn this site into a pro=touring site but I think you might enjoy it as well. Dave was very helpful with the conversion of my VSS. I am sure I will be asking for more advice as the car currently runs very rich. Thanks, Perry

[-=Jeff=-]

That is badass

[WVZR-1]

That is badass


YES IT IS!!!

[Perry Mitchell]

Here are a few more current pictures to enjoy. Sorry, Idon't know why they uploaded sideways.

[32valvZ]

Beautiful!