Speedometer shows 00's - ZR-1 Net Registry Forums

herc795 · 01-19-2017

I have a 1990 and the Speedometer shows zeros, cruise control inop, and service ride control lite on. Does anyone know where I should start to troubleshoot.
Thanks

-=Jeff=- · 01-19-2017

all that not working.. sounds like the VSS (tail of Trans)

keep in mind the 1990 VSS is hard to find, but a 1991 will work with a connector change on the harness

WVZR-1 · 01-19-2017

Don't rush to buy parts - check the connector at the VSS first - I'd probably check the VSS by removing and spinning with a rotary device.

With the SRC and the cluster out it's certainly VSS or the circuit I'd think. If you still have the Delco Bose - does the SCV still work? That would be very unusual and would certainly I think complicate diagnostics. If you had a scanner and it worked then it would certainly create diagnostic issues.

Clean and check connector to the VSS first - remove VSS and spin with rotary device. Get your self a seal GM# 15552872 so you can reseal the VSS when going back together if you remove it. It should be on all dealers shelves.

herc795 · 01-19-2017

Thanks, Yes I still have the Delco Bose and the SCV is also not working now. Nice to know that the VSS for a 91 will work because it is very difficult to find. I will take the VSS out and check the connector.
Thanks for the info

DT

edram454 · 01-20-2017

It definitely sounds like the vss. It is not just hard to get, it is impossible to get unless you know somebody who has a new one in the box. Nobody has a 1990 vss for sale in any business. I did sell a new one in a box when I sold my z to a forum member but I cannot disclose his name unfortunately. I believe you can modify a 1991 to make it work for your 90. Good Luck.

edram454

edram454 · 01-20-2017

btw, the more you drive it the worse it will drive because the computer will think the car is not moving and it will get choppier and slower and on and on until it will run like total crap so dont drive it too much. that is the experience I had with mine. I think I bought the last two available in some old dirty parts bin from GSI Engine Management Group. They acutally made them for GM and by some miracle they found two deep in a old parts bin. They charged me so much for it they did not even put a price on the receipt. I paid around $300 a piece and I bought both. I used one and had a spare. It was item 31018 VEH speed sensor. This was on 3/26/2014. Whats it worth now?? a lot more I guess.

edram454

herc795 · 01-20-2017

I am going to get a 91 VSS.

Thanks

herc795 · 01-21-2017

Well I took the VSS out and there is no drive gear (77) on the main transmission shaft. What is the gear made of and any suggestion what could of happen to it. There was one sliver of plastic and that was it.

WVZR-1 · 01-21-2017

Quote:

Originally Posted by herc795

Well I took the VSS out and there is no drive gear (77) on the main transmission shaft. What is the gear made of and any suggestion what could of happen to it. There was one sliver of plastic and that was it.

If the retainer(76) failed anything is possible. If the retainer (76) is still there and holding just the remnants of what was the drive gear then I'd think the VSS froze and the driven took out the drive BUT I'd doubt that. I don't know that I've ever seen the drive fail unless the retainer broke. Did you check the VSS and the driven gear? Is the driven gear OK or does it display some damage also? Did the speedometer ever work for you? Could you spin the driven gear on the VSS? Did you try the VSS with a rotary tool?

herc795 · 01-21-2017

Once I got the VSS out I hooked back up turn ignition switch on and put drill on the end of VSS and the speedometer worked. there is no remnants of drive gear. If the retainer failed would the drive gear move forward?

01-19-2017	#1
herc795 Join Date: Jul 2013 Location: Mansfield, OH Posts: 20	Speedometer shows 00's I have a 1990 and the Speedometer shows zeros, cruise control inop, and service ride control lite on. Does anyone know where I should start to troubleshoot. Thanks __________________ 1990 Red ZR-1 #2300 DT :cheers:

01-19-2017	#2
-=Jeff=- Join Date: Jul 2007 Location: Bartlett, IL Posts: 7,155	Re: Speedometer shows 00's all that not working.. sounds like the VSS (tail of Trans) keep in mind the 1990 VSS is hard to find, but a 1991 will work with a connector change on the harness __________________ 1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978

01-19-2017	#3
WVZR-1 Join Date: Oct 2004 Posts: 1,889	Re: Speedometer shows 00's Don't rush to buy parts - check the connector at the VSS first - I'd probably check the VSS by removing and spinning with a rotary device. With the SRC and the cluster out it's certainly VSS or the circuit I'd think. If you still have the Delco Bose - does the SCV still work? That would be very unusual and would certainly I think complicate diagnostics. If you had a scanner and it worked then it would certainly create diagnostic issues. Clean and check connector to the VSS first - remove VSS and spin with rotary device. Get your self a seal GM# 15552872 so you can reseal the VSS when going back together if you remove it. It should be on all dealers shelves.

01-19-2017	#4
herc795 Join Date: Jul 2013 Location: Mansfield, OH Posts: 20	Re: Speedometer shows 00's Thanks, Yes I still have the Delco Bose and the SCV is also not working now. Nice to know that the VSS for a 91 will work because it is very difficult to find. I will take the VSS out and check the connector. Thanks for the info DT __________________ 1990 Red ZR-1 #2300 DT :cheers:

01-20-2017	#5
edram454 Join Date: Nov 2013 Location: .. Posts: 693	Re: Speedometer shows 00's It definitely sounds like the vss. It is not just hard to get, it is impossible to get unless you know somebody who has a new one in the box. Nobody has a 1990 vss for sale in any business. I did sell a new one in a box when I sold my z to a forum member but I cannot disclose his name unfortunately. I believe you can modify a 1991 to make it work for your 90. Good Luck. edram454 __________________ EDRAM454 1990 #3028..siamese ported plen/hous/SGC/fidanza/DRM LTHeaders/DRM roll cage/camber rod/drilled slot rotors hawk track pads/grand sport calipers/full corsa exhaust/Hurst/NO cats/custom SGC chip/cbeamplate/315's on all 4/intake water plugged/smog removed..RC injectors/LED lights..SHOULD NOT HAVE PUT ALL THE MONEY IN IT.. SOLD.

01-20-2017	#6
edram454 Join Date: Nov 2013 Location: .. Posts: 693	Re: Speedometer shows 00's btw, the more you drive it the worse it will drive because the computer will think the car is not moving and it will get choppier and slower and on and on until it will run like total crap so dont drive it too much. that is the experience I had with mine. I think I bought the last two available in some old dirty parts bin from GSI Engine Management Group. They acutally made them for GM and by some miracle they found two deep in a old parts bin. They charged me so much for it they did not even put a price on the receipt. I paid around $300 a piece and I bought both. I used one and had a spare. It was item 31018 VEH speed sensor. This was on 3/26/2014. Whats it worth now?? a lot more I guess. edram454 __________________ EDRAM454 1990 #3028..siamese ported plen/hous/SGC/fidanza/DRM LTHeaders/DRM roll cage/camber rod/drilled slot rotors hawk track pads/grand sport calipers/full corsa exhaust/Hurst/NO cats/custom SGC chip/cbeamplate/315's on all 4/intake water plugged/smog removed..RC injectors/LED lights..SHOULD NOT HAVE PUT ALL THE MONEY IN IT.. SOLD.

01-20-2017	#7
herc795 Join Date: Jul 2013 Location: Mansfield, OH Posts: 20	Re: Speedometer shows 00's I am going to get a 91 VSS. Thanks __________________ 1990 Red ZR-1 #2300 DT :cheers:

01-21-2017	#8
herc795 Join Date: Jul 2013 Location: Mansfield, OH Posts: 20	Re: Speedometer shows 00's Well I took the VSS out and there is no drive gear (77) on the main transmission shaft. What is the gear made of and any suggestion what could of happen to it. There was one sliver of plastic and that was it. __________________ 1990 Red ZR-1 #2300 DT :cheers:

01-21-2017	#10
herc795 Join Date: Jul 2013 Location: Mansfield, OH Posts: 20	Re: Speedometer shows 00's Once I got the VSS out I hooked back up turn ignition switch on and put drill on the end of VSS and the speedometer worked. there is no remnants of drive gear. If the retainer failed would the drive gear move forward? __________________ 1990 Red ZR-1 #2300 DT :cheers: