1990 Model 100 Cruise Control Woes (Longish)
10-16-2001, 06:42 PM
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1990 Model 100 Cruise Control Woes (Longish)
I bought this car afew months ago & am in the process of sorting out a myriad of problems. Have replaced a window regulator, timing belt, water pump, all tune up stuff, fuel pump (which drew blood) & recently, the gang of switches for the headlights & cruise control. The latter was precipitated by high beams which worked only infrequently & the cruise control which worked only briefly after the car's purchase. Replacing this switch cluster I'd hoped would take care of boththe high beam & cruise control isssues but only successfully addressed the former.To troubleshoot the latter, I've confirmed the servo will hold a vacuum & that the brake pedal switch effectively breaks that vacuum. (Haven't checked the brake pedal switch electrically yet.) I also hot wired the vacuum pump & it too appears to function. I'm really trying to avoid pulling the dash apart to get to the control ECU & wonder if anyone has a suggestion for bench testing the speed sensor or any other words of advice. Thanks for the help.
10-17-2001, 03:53 AM
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Re: You have a Bentley Service manual?
Yes, sir. That's where I saw that to do extensive troubleshooting, I'd have to pull the top of the dash off to get to the control ECU. That effort looked like a son of a gun. BTW, forgot to mention in my original post that, yes, I have checked the fuses!
10-17-2001, 11:57 AM
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You sir, are in the wrong forum...:)
Bring your 1990 100 over to the 5000/200/V8 forum and join your fellow type 44(Audi 5000/100/200/V8)owners...
Maybe somebody over there will be more familiar with this subject since those cars are somewhat similar...?
Steve
88 5000
Michigan
Maybe somebody over there will be more familiar with this subject since those cars are somewhat similar...?
Steve
88 5000
Michigan
10-17-2001, 12:34 PM
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Re: what is the vacum pump? I thought it uses intake
It's got a little electric pump with a solenoid evidently moderated by the cruise control ECU. It's mounted in the fender behind the overflow container for the radiator.
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10-18-2001, 02:41 PM
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Common mistake...
I wish the hierarchy here at Audiworld would get that fixed so everyone knows where to go for help...
Hope someone can help you over at the 5000/100/200/V8 forum...
Anyways, welcome to Audiworld!
Hope someone can help you over at the 5000/100/200/V8 forum...
Anyways, welcome to Audiworld!
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