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1/29/13 6:22pm - Original Message: '1982 cruise control'
vettejack Lifetime Member
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Titusville, FL - USA

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1977 Coupe (White), 1982 Coupe (Silver), 2006 Convertible (Victory Red). NCM Life Member #2221.

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I've been working the cruise control issue on my  '82 with no success over the last 5 years. On the 82 wiring schematic I found a "vehicle speed sensor' that looks to be hidden behind the speedometer if you were to pull the instrument rack. I found only a partial part number for this sensor with the rest of the diagram faded and I think it starts the 8 digit part number with either 1200 or 1201. The wiring to/from this sensor shows it to be combination of a .5 pink/black wire, a .5 black/white wire, and finally a .8 brown wire. Has anyone with an '82 seen this sensor before, and knows its location?? I may have a junk yard in SC, with an '82 being parted out, and the guy thinks he know of this part to save out for me. Please get back to me ASAP so I can order this part from this guy!! Does it look anything like the enclosed photos? Thanx!!

 
 
 
 
(Large images modified to clickable links - Norsky)


|UPDATED|1/29/2013 3:22:50 PM (AZT)|/UPDATED|
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1/28/13 1:44pm - Reply: 'Re: 1982 cruise control'
DaveM Lifetime Member
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Flanders, NJ - USA

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1982 Black, ZZ4, Hooker Side Pipes, 3.55 Rear, Rebuilt & upgraded 700R4, All new suspension, brakes, & new Charcoal interior.

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The speed sensor is tied into the computer, if you have a bad speed sensor you would have other problems as well. I'm not familiar with the cruise control since my '82 does not have it.
Good luck.
Dave


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2/8/13 2:25pm - Reply: 'Re: 1982 cruise control'
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Duncanville, TX - USA

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I'm not 100% sure, but if your cruize control has the transducer mounted on the driver side fenderwell, your VSS signal should come from that.I'm not seeing anything in any of the diagrams I have that would indicate a separate VSS sensor on the cluster itself. I do have the Factory Service manual at home for the '82, so I can check it later this evening, and see if I can see what you are seeing....

And...to answer the actual question, NO, none of the sensors you pictured as for your vehicle...those are all Ford sensors, that go into the trans.




|UPDATED|2/8/2013 11:25:31 AM (AZT)|/UPDATED|


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1/28/13 8:59pm - Reply: 'Re: 1982 cruise control'
ccollier
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corinth, TX - USA

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The transducer is the speed sensor. It is driven by the speedo cable and converts the rotation of the cable into an electrical value that is proportional to the speed. The transducer then regulates vacuum to the servo. I don't know what kind of problem you are having, but have replaced alot of transducers in my day. Make sure your vacuum lines are good to the transducer and the servo holds vacuum.

Hope this helps!Thumbs Up
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1/29/13 2:38am - Reply: 'Re: 1982 cruise control'
rraider1
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Woodland, WA - USA

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if their was a vss it would most likely be like this attached to speedometer

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1/29/13 1:39pm - Reply: 'Re: 1982 cruise control'
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Duncanville, TX - USA

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Bob....what is that speedo out of, do you know?

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1/29/13 8:55pm - Reply: 'Re: 1982 cruise control'
rraider1
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Woodland, WA - USA

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I am not sure I know this question came upm before and I found this. I will look back through my stuff to see if I can figure it out


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1/29/13 9:37pm - Reply: 'Re: 1982 cruise control'
rraider1
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Woodland, WA - USA

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their is this buliten I am not sure whether speedo was corvette or cammaro
 
1981: Service Bulletin: Vehicle Speed Sensor Servicing

Subject: Vehicle Speed Sensor Servicing
Model and Year: 1981 Corvettes
Source: Chevrolet Dealer Service Information Bulletin
Bulletin Number: 81-I-17
Section: VIt
Date: January, 1981

TO: ALL CHEVROLET DEALERS

Beginning with the 1980 1/2 model year pull-ahead program, the speedometers of the car lines listed in the chart below [Corvette included - CAC Staff] will be equipped with an optical vehicle speed sensor (VSS). The VSS will furnish data to the ECM for activating the torque converter clutch and for influencing the Computer Command Control idle speed control system.

To diagnose and service this VSS speedometer system, code 24 of the Computer Command Control should be performed as follows:

  1. With ignition on, engine off, probe pin #16 of the ECM with a voltmeter. Raise one wheel and rotate to observe for varying voltage.
  2. If no variation is observed, the connection between the IP harness and VSS buffer amplifier must be disconnected. Then pin to pin voltage checks can be made of the IP harness connector to determine any problems with the IP harness.
  3. If OK, check VSS connector.
  4. If OK, replace VSS assembly.
  5. If condition persists, the speedometer must be returned to an AC-Delco account authorized to repair speedometers equipped with VSS. To insure proper speedometer repair specify in the "nature of Problem" area on AC-Delco warranty claim form ACD-1078 "Code 24 VSS Problem."


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Bob R
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1/29/13 9:46pm - Reply: 'Re: 1982 cruise control'
rraider1
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Woodland, WA - USA

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1977 T-Top,350,Auto Black Ruby Pearl,Steeroids R&P conversion

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If you do a search on site for vss theinfo is their, I think I got the picture off of ebay just to show how the sensor hooks to speedo

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Bob R
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1/29/13 11:41pm - Reply: 'Re: 1982 cruise control'
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Duncanville, TX - USA

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Service Bulletin said: 
 
1981: Service Bulletin: Vehicle Speed Sensor Servicing

Subject: Vehicle Speed Sensor Servicing
Model and Year: 1981 Corvettes
Source: Chevrolet Dealer Service Information Bulletin
Bulletin Number: 81-I-17
Section: VIt
Date: January, 1981

TO: ALL CHEVROLET DEALERS

Beginning with the 1980 1/2 model year pull-ahead program, the speedometers of the car lines listed in the chart below [Corvette included - CAC Staff] will be equipped with an optical vehicle speed sensor (VSS). The VSS will furnish data to the ECM for activating the torque converter clutch and for influencing the Computer Command Control idle speed control system.



From what I read, this particular sensor is NOT part of the cruise control system...it is only an input to the ECM for the TCC and idle speed. It is apparently just a "piggyback" running off of the actual speedo cable coming from the cruise transducer. At least, that's how I read it. I need to get the Service manual and check it out....Thanks Bob! Thumbs Up


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Joel Adams
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1/30/13 1:04am - Reply: 'Re: 1982 cruise control'
rraider1
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Woodland, WA - USA

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From what I read also, it hase a photo eye that shines at some disk that creates a pulse. I quess I got focused on trying to remember where I found that you are right I didnt see any tie in to the cruise, if someone needs one their is a spedo and transducer on ebay. back to original problem Question
Here is good info on speed sensors http://www.jagsthatrun.com/V8-chapters/V8-tpi-Speed-Sensors.pdf

|UPDATED|1/29/2013 10:04:31 PM (AZT)|/UPDATED|


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1/30/13 8:29am - Reply: 'Re: 1982 cruise control'
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Duncanville, TX - USA

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I checked the Factory Service manual, and the sensor on the speedo head itself is NOT  connected to, nor does it have anything to do with cruise control operation. The cruise control speed info comes from the transducer itself. Thumbs Up

Exactly what kind of issue are we trying to solve here, anyway? Does the cruise not engage at all, not hold the correct speed, or what?


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2/1/13 3:30pm - Reply: 'Re: 1982 cruise control'
vettejack Lifetime Member
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Titusville, FL - USA

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The cruise does not engage at all.
 
I've replaced the xducer twice now. I am also aware you can replace a bad part with a bad part.
 
I've also replaced the "resume solenoid" that sits on top of the xducer...twice. It is mounted on its own bracket and itself sits on top of the xducer. 
 
I've also made sure the ground wire from the xducer is properly attached to the frame.
 
When the interior was redone, I had a new switch installed (turn signal, etc.). 
 
Another time a buddy and myself hooked up a meter and tested the connection for electrical impulse to check the brake switch and found the brake switch makes the meter go from 14 volts to zero volts...meaning the cruise dis-engages...but yet can't find the engage portion to test.
 
We also removed the air line from the servo to the xducer and it moves...and if you hold your breath, the diaphram holds as well.
 
All this leads me to the VSS once again. I've been told unless the VSS senses the same speed as the transmission (??) and somehow is not 'read' correctly, then it will not allow the cruise to engage. Not sure about that since my speedometer reads about 15 mph over anyway. I had my wife run up against me to find out in another car. The speedo was sent out to Rogers' Clock Service and replaced. At that time I did not see anything else that needed to be removed from the back...then again, the VSS may have been missing this whole time to begin with, and I simply didn't know it.


|UPDATED|2/1/2013 12:30:08 PM (AZT)|/UPDATED|


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2/1/13 7:44pm - Reply: 'Re: 1982 cruise control'
tb2k82ce Lifetime Member
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Lemon Grove, CA - USA

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1982 C3 Collectors Edition 44000 miles, sat in the sun most of it's life, My wife purchased it for me for fathers day in 2007 from her girl friend that had it for 19 years. It is on the road again. I'm retired but it is now my daily driver.

Joined: 10/17/2007
Posts: 2007
By the way I checked my speedometer with my Garmin. Most cars show faster than they really are going by about 2% to 4%.
If you want to fix your speedometer reading this place has some info, parts and service. You can actually call and talk to a tech guy.  I was reading 10% high which means you run out of speedometer quickly with an 85 mph speedometer.
It is easy enough to change gears although some of the gears may not be available.  At one time I purchase the last know size.  I know that because I could not find any.  I went down one size and it got me close to actual speed. 
Keep in mind the housing are different for the 40-45 tooth drives and the 34-39 tooth drives.  you may need to change that.  You will know if you need to because it only takes about 4 miles for the shaft to snap off the gear and you then get ZERO mph on the speedometer.  Do not ask me how I know this.
Sorry about slightly off subject.  I'm getting ready to work on my 82 Cruise Control also. Very interesting discussion so far.


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2/1/13 11:18pm - Reply: 'Re: 1982 cruise control'
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

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John,do you have the Service Manual for your car? If not, I can try to send you the troubleshooting info from the Manual. I'll have to scan it first, but if you need it, I'll get it to ya.
IF the optical sensor behind the cluster gauge does have anything to do with the Cruize, it is NOT showing in the service manual.
I wonder if your car originally HAD cruise, or if someone tried adding it later, but it never worked? IF the optical sensor IS part of the cruise, system, and the car did not have cruise originally, it would stand to reason that it would not have the optical sensor either, nor would the ECM be able to activate the cruise...

The mystery deepens....I'll keep looking.

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2/2/13 10:24am - Reply: 'Re: 1982 cruise control'
DaveM Lifetime Member
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Flanders, NJ - USA

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1982 Black, ZZ4, Hooker Side Pipes, 3.55 Rear, Rebuilt & upgraded 700R4, All new suspension, brakes, & new Charcoal interior.

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My '82 never had cruise control and it has the speed sensor. I don't think it has anything to do with the cruise control.
Dave


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2/2/13 12:11pm - Reply: 'Re: 1982 cruise control'
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

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I agree, Dave. I've poured all thru the '82 Service manual, and the cruise control is a stand alone system. The VSS is ONLY used for the trans converter lock-up, and the injector/fuel control. Plus, if there is a problem with the VSS, it will set a code 24, and turn on the "Check Engine" light.
From what I can tell, the VSS takes the rotational movement of the speedo cable from the back of the speedo gauge, changes it into an electrical signal by way of the pulsing of an LED thru a shutter/window, and then buffers it before sending the signal to the ECM.
Nowhere on any of the wiring diagrams, or troubleshooting charts for the Cruise Control does this VSS signal come into play.


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2/8/13 2:14pm - Reply: 'Re: 1982 cruise control'
vettejack Lifetime Member
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Titusville, FL - USA

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I've been workig with a Corvette specialist is SC, whom I met in Kissimmee over the last weekend of January while at the Wonderful World of Corvettes. He informed me that he just 'junked' an '82 and knew of the Vehicle Speed Sensor. He even took, and sent, pictures of the sensor...with location(s) pointed out behind the speedometer and hooked to the appropiate harness. This should help when I'm ready to dig back into the dash. I'm ordering two of these sensors since he said he had them. 


http://www.c3vr.com/member_uploads/11101_11200/11187/2E6E2_1982_speed_sensor_photo.JPG

http://www.c3vr.com/member_uploads/11101_11200/11187/Z36C9_photo.JPG

http://www.c3vr.com/member_uploads/11101_11200/11187/64664_photo1.JPG

(modified large images to links-aapple)


|UPDATED|2/8/2013 11:14:48 AM (AZT)|/UPDATED|


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2/8/13 2:23pm - Reply: 'Re: 1982 cruise control'
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19449
Interesting...
What I see is a buffer(the yellow box thingy) plugged into the speedo head, so the "optical sensor" part MUST be part of the actual speedo gauge. The buffer smoothes/changes the signal to something(digital) the ECM can read. SO there could be a problem with either the buffer OR the speedo gauge part if it has a code 24, or there is some other symptom that would lead someone to suspect a problem with that sensor, such as no  lock-up  on the trans.
Neato...learn something new every day!
I still see no correlation between this sensor and the cruize control....Unhappy

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