Topic: 1982 cruise control
in Forum: C3 Electrical
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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 
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|
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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Lifetime MemberModerator
Duncanville, TX - USA
Joined: 11/8/2003
Posts: 20214
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
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. 
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?
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?
Joel Adams
C3VR Lifetime Member #56 
My Link 
(click for Texas-sized view!) NCRS
"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
The cruise does not engage at all.
|UPDATED|2/1/2013 12:30:08 PM (AZT)|/UPDATED|
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|
Lifetime MemberLemon Grove, CA - USA
Joined: 10/17/2007
Posts: 2041
Vette(s): 1982 C3 Collectors Edition 44000 miles, sat in the sun most of its life, My wife purchased it for me for Father's Day in 2007 from her girlfriend that had it for 19 years. It is on the road again. I'm retired but it is now my daily driver.
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.
Lifetime MemberModerator
Duncanville, TX - USA
Joined: 11/8/2003
Posts: 20214
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
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.
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.
Joel Adams
C3VR Lifetime Member #56
My Link
(click for Texas-sized view!) NCRS
"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
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
Lifetime Member #116
Dave's '82 
Lifetime MemberModerator
Duncanville, TX - USA
Joined: 11/8/2003
Posts: 20214
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
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.
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.
Joel Adams
C3VR Lifetime Member #56
My Link
(click for Texas-sized view!) NCRS
"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
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|
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|
Lifetime MemberModerator
Duncanville, TX - USA
Joined: 11/8/2003
Posts: 20214
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
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....
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....
Joel Adams
C3VR Lifetime Member #56
My Link
(click for Texas-sized view!) NCRS
"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
in Forum: C3 Electrical
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