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Old 06-11-2014   #1
Jetjock
 
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Location: Auburn, KY
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Default Cruise control inop

When I got my Ruby Red Z last April, I discovered that the cruise control did not work. At the time, I thought it was an easy fix, just check the hoses. I took it down to Gordon for him to take a look at it. He checked the vacuum and it was good. Check the dump switch and it worked fine. Switched out the stem with my other ZR-1 and that didn't do it. Finally, switched out the cruise control module with one that Gordon had and that didn't do it. I checked the clutch switch and it is clicking like it should which doesn't necessarily mean that it's working but that means that the adjustment is okay. Buying a test light to run through the diagnostics in the service manual. We did find out that someone put a 5 amp fuse in where it should have been a ten. We did find out that the LTPWS module has been fried because it would not enter into diagnostics mode. The cruise and the LTPWS share the same fuse. Looking for suggestions as to what next. No speed sensors codes shown.
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Roy L. Carman

If I feel the need for speed,
I just think about flying the B-777.



1989 Dk Blue Coupe lost in divorce
1991 Black Coupe SOLD
1992 Black ZR-1 #423 SOLD!
1993 Ruby Red 40th Anniversary ZR-1 #334
1995 Black ZR-1 taken by ex-wife
2002 Pewter Coupe no idea where it is
2003 50th Anniversary Corvette #No idea what number SOLD!
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Old 06-11-2014   #2
GOLDCYLON
 
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Default Re: Cruise control inop

Quote:
Originally Posted by Jetjock View Post
When I got my Ruby Red Z last April, I discovered that the cruise control did not work. At the time, I thought it was an easy fix, just check the hoses. I took it down to Gordon for him to take a look at it. He checked the vacuum and it was good. Check the dump switch and it worked fine. Switched out the stem with my other ZR-1 and that didn't do it. Finally, switched out the cruise control module with one that Gordon had and that didn't do it. I checked the clutch switch and it is clicking like it should which doesn't necessarily mean that it's working but that means that the adjustment is okay. Buying a test light to run through the diagnostics in the service manual. We did find out that someone put a 5 amp fuse in where it should have been a ten. We did find out that the LTPWS module has been fried because it would not enter into diagnostics mode. The cruise and the LTPWS share the same fuse. Looking for suggestions as to what next. No speed sensors codes shown.

Is the brake switch centered on the brake pedal arm? If its not the cruise wont set.
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GOLDCYLON - 90 ZR-1 #2794, 4L60e (Formerly Schrade's)

GOLDCYLON - 11 CTS-V


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91 WHITE/BLACK #2014. 380 P&P&PCed,Ported Heads, Jeal Long tubes, Corsa Exhaust/FIKSE FM-5s /LED TLs, LED Headlights, Front Wilwood 6 piston narrowlite calipers and rear Wilwood caliper street shop mod,CNCed Coolant Pipes,TPI Cvr,Filter cover,Stainless Bolts, DRM/DOM PROM /ZFDOC mod build #102,DRLs,BMAD with stainless Debris Screen,Coplan Air Blaster, Pioneer APP Radio 4,Brey-Krause HB,Sub Bar,Fire extinguisher seat mount,DRM Coilovers,LEDs everywhere,Compass mirror (orange),V1 DIC hidden display, Homelink sun visor, Carbon Fiber top x3 and APSIS Carbon Fiber interior, APSIS CF Steering Wheel/NAPA Leather, Banski trailing arms, Guldstrand front suspension,urethane bushings from Prothane (total suspension) ZFDoc drive shaft safety loop, raptor shift light (orange),AO engineering louver front plate, Console seat cushion, 96CE seats with black custom Sheepskins, ss billet catch can,Viper remote entry/alarm,Cragar Rear Louvers,LED side louver lights, Dewitts Radiator with SPAL fans and a Woods 160 T-Stat

90 RED/BLACK #2794. 4L60e Automatic Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless Headers, Corsa Exhaust, SAN Secondaries and Haibeck PROM, Exotic Muscle Coil overs, LED Interior Lights, LED Tail Lights, LED Headlights, 94 Sport seats with black custom Sheepskins , Cragar rear louvers, GS Front calipers, Banski Trailing arms, APSIS Carbon Fiber steering wheel, Front and Rear Baer Eradispeeds, DRLs, Guldstrand front suspension,urethane bushings from Prothane (total suspension), Dewitt's Raditor with Dual SPAL fans and a Haibeck 170 T-Stat

11 RED/GREY CTS-V

Last edited by GOLDCYLON; 06-11-2014 at 12:16 PM.
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Old 06-11-2014   #3
Jetjock
 
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Default Re: Cruise control inop

Well, good question. I know that the dump switch works because Gordon was holding a vacuum meter in front of me when I hit the brake pedal. I haven't checked the alignment yet. That's now the next step right after I get my wife some coffee. Apparently, she ran out and I didn't know that. My fault, obviously. Funny how priorities get changed around like that.

Thanks dude.
__________________
Roy L. Carman

If I feel the need for speed,
I just think about flying the B-777.



1989 Dk Blue Coupe lost in divorce
1991 Black Coupe SOLD
1992 Black ZR-1 #423 SOLD!
1993 Ruby Red 40th Anniversary ZR-1 #334
1995 Black ZR-1 taken by ex-wife
2002 Pewter Coupe no idea where it is
2003 50th Anniversary Corvette #No idea what number SOLD!
ZR-1 Net Registry #516
Grand Sport Lifetime Member
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Old 06-11-2014   #4
GOLDCYLON
 
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Default Re: Cruise control inop

Quote:
Originally Posted by Jetjock View Post
Well, good question. I know that the dump switch works because Gordon was holding a vacuum meter in front of me when I hit the brake pedal. I haven't checked the alignment yet. That's now the next step right after I get my wife some coffee. Apparently, she ran out and I didn't know that. My fault, obviously. Funny how priorities get changed around like that.

Thanks dude.
Happy Wife ='s Happy Life

OK let us know hopefully thats it.
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GOLDCYLON - 90 ZR-1 #2794, 4L60e (Formerly Schrade's)

GOLDCYLON - 11 CTS-V


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91 WHITE/BLACK #2014. 380 P&P&PCed,Ported Heads, Jeal Long tubes, Corsa Exhaust/FIKSE FM-5s /LED TLs, LED Headlights, Front Wilwood 6 piston narrowlite calipers and rear Wilwood caliper street shop mod,CNCed Coolant Pipes,TPI Cvr,Filter cover,Stainless Bolts, DRM/DOM PROM /ZFDOC mod build #102,DRLs,BMAD with stainless Debris Screen,Coplan Air Blaster, Pioneer APP Radio 4,Brey-Krause HB,Sub Bar,Fire extinguisher seat mount,DRM Coilovers,LEDs everywhere,Compass mirror (orange),V1 DIC hidden display, Homelink sun visor, Carbon Fiber top x3 and APSIS Carbon Fiber interior, APSIS CF Steering Wheel/NAPA Leather, Banski trailing arms, Guldstrand front suspension,urethane bushings from Prothane (total suspension) ZFDoc drive shaft safety loop, raptor shift light (orange),AO engineering louver front plate, Console seat cushion, 96CE seats with black custom Sheepskins, ss billet catch can,Viper remote entry/alarm,Cragar Rear Louvers,LED side louver lights, Dewitts Radiator with SPAL fans and a Woods 160 T-Stat

90 RED/BLACK #2794. 4L60e Automatic Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless Headers, Corsa Exhaust, SAN Secondaries and Haibeck PROM, Exotic Muscle Coil overs, LED Interior Lights, LED Tail Lights, LED Headlights, 94 Sport seats with black custom Sheepskins , Cragar rear louvers, GS Front calipers, Banski Trailing arms, APSIS Carbon Fiber steering wheel, Front and Rear Baer Eradispeeds, DRLs, Guldstrand front suspension,urethane bushings from Prothane (total suspension), Dewitt's Raditor with Dual SPAL fans and a Haibeck 170 T-Stat

11 RED/GREY CTS-V
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Old 06-11-2014   #5
We Gone
 
Join Date: Apr 2004
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Default Re: Cruise control inop

Had the same issue when I got my 93. was the clutch switch out of adjustment.
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1990 Steel Blue/Black #2355
1990 Red/Red #1473
1991 Quasar /Black #118 Sold
1991 Turquoise/Black #766 Parted Out
1993 Yellow/White #179 Sold
1990 Black/Gray #1361 Headers/4:10s Sold
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Old 06-11-2014   #6
Jetjock
 
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Default Re: Cruise control inop

Quote:
Originally Posted by We Gone View Post
Had the same issue when I got my 93. was the clutch switch out of adjustment.
When you say out if adjustment, was it not switching on and off or was it not hitting at all? What did you do to readjust it?
__________________
Roy L. Carman

If I feel the need for speed,
I just think about flying the B-777.



1989 Dk Blue Coupe lost in divorce
1991 Black Coupe SOLD
1992 Black ZR-1 #423 SOLD!
1993 Ruby Red 40th Anniversary ZR-1 #334
1995 Black ZR-1 taken by ex-wife
2002 Pewter Coupe no idea where it is
2003 50th Anniversary Corvette #No idea what number SOLD!
ZR-1 Net Registry #516
Grand Sport Lifetime Member
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Old 06-11-2014   #7
Schrade
 
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Default Re: Cruise control inop

Gordon Killebrew couldn't fix it?

And he wasn't able to even tell what was wrong?

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I'm getting my snappics / threads removed blindly as fast as I can, to get in compliance with copyright / license TOS on the boards here (lots of FSM pages and other copyright / license violations on my part; sorry guys). And thanks to all the guys who didn't whine when I posted those FSM copyrighted / licensed stuff in my threads...

( :thumbsup: [b]and to think I complied with a mod's request to delete a pic of him in a Challenge Car in NCM Museum, so he wouldn't get in hot water)[/b]

Thanks to several guys here for sending parts FREE; BearlyFlying, WeGone, Geezer, GoldCylon, and more there, TonyD, mike100, fletchusmc...

1990 #2794; 4L60e Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless, Power Effects 3"

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Old 06-11-2014   #8
Jetjock
 
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Default Re: Cruise control inop

Quote:
Originally Posted by Schrade View Post
Gordon Killebrew couldn't fix it?

And he wasn't able to even tell what was wrong?

To be fair to Gordon, his service manuals were loaned out to someone and they were either destroyed or something happened to them. He suspected either the stem, the cruise control module or the clutch switch. I eliminated two of the three items. I have the manuals for the 93 so I'm running down there right now and see if we can checkout the system.
__________________
Roy L. Carman

If I feel the need for speed,
I just think about flying the B-777.



1989 Dk Blue Coupe lost in divorce
1991 Black Coupe SOLD
1992 Black ZR-1 #423 SOLD!
1993 Ruby Red 40th Anniversary ZR-1 #334
1995 Black ZR-1 taken by ex-wife
2002 Pewter Coupe no idea where it is
2003 50th Anniversary Corvette #No idea what number SOLD!
ZR-1 Net Registry #516
Grand Sport Lifetime Member
NCM Lifetime #1468
ZR-1 Net Registry Board Secretary
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Old 06-11-2014   #9
Mystic ZR-1
 
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Default Re: Cruise control inop

Quote:
Originally Posted by Schrade View Post
Gordon Killebrew couldn't fix it?

And he wasn't able to even tell what was wrong?

Then, it ain't broak...
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Old 06-11-2014   #10
We Gone
 
Join Date: Apr 2004
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Default Re: Cruise control inop

Quote:
Originally Posted by Jetjock View Post
When you say out if adjustment, was it not switching on and off or was it not hitting at all? What did you do to readjust it?
It was depressed keeping the button pushed in. If I remember correctly I turned the white plastic nut to move the switch back to release the switch.
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1990 Steel Blue/Black #2355
1990 Red/Red #1473
1991 Quasar /Black #118 Sold
1991 Turquoise/Black #766 Parted Out
1993 Yellow/White #179 Sold
1990 Black/Gray #1361 Headers/4:10s Sold
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