Cruise control testing on 1988 s4 auto
11-16-2016, 06:36 PM
#1
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Cruise control testing on 1988 s4 auto
I have not had cruise control since I bought the car 2 months ago. I have tested cc module plug as per manual ,all power and earths are correct on the pins and switch on and off with the stalk as they should. The ohms readings are not as manual at the plug or under the wing operating servo plug and I dont know what thats telling me! The module has been tested for dry joints and resoldered. Any suggestions?
11-16-2016, 06:58 PM
#2
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The 88+ module rarely fails but it may be worth trying another one.
Are you getting a signal from the cruise switch on the steering wheel?
Are you getting a signal from the cruise switch on the steering wheel?
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Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission?
George Layton March 2014
928 Owners are ".....a secret sect of quietly assured Porsche pragmatists who in near anonymity appreciate the prodigious, easy going prowess of the 928."
Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission?
George Layton March 2014928 Owners are ".....a secret sect of quietly assured Porsche pragmatists who in near anonymity appreciate the prodigious, easy going prowess of the 928."
11-16-2016, 09:05 PM
#4
My 88's cruise didn't work when I bought it. Chased down all the other electrical control stuff/tempostat and it was found to be ok. All the vacuum lines were replaced.
The mechanical vacuum/servo unit (same one as in 944) attached to the throttle linkage was found to be stuck/unmovable and therefore inoperative. A new one went in and it works great. I don't have the part number in front of me, but that was what was broken in my case. Hope this helps.
The mechanical vacuum/servo unit (same one as in 944) attached to the throttle linkage was found to be stuck/unmovable and therefore inoperative. A new one went in and it works great. I don't have the part number in front of me, but that was what was broken in my case. Hope this helps.