ABS - Mystery Continues
#1
Instructor
Thread Starter
ABS - Mystery Continues
I followed the following Rennlist thread to test the speed sensors. All sensors tested fine.
https://rennlist.com/forums/924-931-...-resolved.html
I'm curious where to go next to get rid of those rotten ____!_____ and Antilock lights on my dash.
Also where is the ABS relay in the fusebox? Can't find a diagram for that to save my life.
https://rennlist.com/forums/924-931-...-resolved.html
I'm curious where to go next to get rid of those rotten ____!_____ and Antilock lights on my dash.
Also where is the ABS relay in the fusebox? Can't find a diagram for that to save my life.
Last edited by dpoul34; 02-14-2011 at 08:15 PM.
#2
Addict
Rennlist Member
Rennlist Member
Same here. No ABS light at start up and no light for a minute or two after the car starts to roll. Light comes on after that. Checked the sensor resistance as per the thread above and everything checked out.
Help us ABS-Kenobi, you're our only hope!
Help us ABS-Kenobi, you're our only hope!
#3
Instructor
Thread Starter
One of my responses from an ABS-Kenobi told me that the ABS issue is a "black box" type of issue, that normally can only be tested with a Bosch Hammer tool to diagnose the code available at the dealer and then we can fix whatever they tell is wrong.
I hate to think I am handcuffed on this, but I have worked so hard on this car this winter to restore it and I NEED this light to friggin' shut off!
I hate to think I am handcuffed on this, but I have worked so hard on this car this winter to restore it and I NEED this light to friggin' shut off!
#4
Addict
Rennlist Member
Rennlist Member
According to my local Porsche mechanic, who was recently doing some work related to my wreck, there are no codes that can be pulled from this generation of ABS. Can't confirm that myself, just passing along what he said...
#6
Addict
Rennlist Member
Rennlist Member
ABS Relay is in position G20. Silver one, third one in from top right. They're not cheap, $128 from Pelican, so it's not something I want to throw parts at. Maybe I'll try and borrow a known good one from someone local and see if that's it.
#7
Happy hunting.
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#8
Here is a thread about the ABS TEST manual
https://rennlist.com/forums/924-931-...BS+TEST+manual
Also, the manual cover 928 and 944 so the 928 guys may have it.
https://rennlist.com/forums/924-931-...BS+TEST+manual
Also, the manual cover 928 and 944 so the 928 guys may have it.
Last edited by Bri Bro; 02-16-2011 at 08:14 PM.
#9
Track Day
Join Date: Mar 2009
Location: Cold Lake, Alberta, Canada
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The ABS section of the 944 maintenance manual can be found here;
http://www.cannell.co.uk/944_worksho...l3-chassis.pdf
For the wire diagrams you can also find them at the same site;
http://www.cannell.co.uk/944_worksho...electrical.pdf for years up to 87 and;
http://www.cannell.co.uk/944_worksho...electrical.pdf for 87 and up.
http://www.cannell.co.uk/944_worksho...l3-chassis.pdf
For the wire diagrams you can also find them at the same site;
http://www.cannell.co.uk/944_worksho...electrical.pdf for years up to 87 and;
http://www.cannell.co.uk/944_worksho...electrical.pdf for 87 and up.
#10
If you think that the relay might be bad, but don't want to spend the money on a new one since it may not be the problem anyway, there is a way to test the relay.
What I did was pry the metal cover off the relay, and re-install it. When you turn the car on, there is a metal arm inside the relay that should move. if it doesn't your relay is probably bad. to test further, use something like a pencil to flip the metal switch arm manually. this should turn the light on the dash off. if it does, then the relay is your problem.
I had the same problem with my 87 NA, and after cleaning all the sensors, it turned out to be the relay after all.
What I did was pry the metal cover off the relay, and re-install it. When you turn the car on, there is a metal arm inside the relay that should move. if it doesn't your relay is probably bad. to test further, use something like a pencil to flip the metal switch arm manually. this should turn the light on the dash off. if it does, then the relay is your problem.
I had the same problem with my 87 NA, and after cleaning all the sensors, it turned out to be the relay after all.
#11
Instructor
Thread Starter
I do not have a relay in G20 nor do I have any open place to put a relay in G20. It's just a blank cap in that position.
http://i228.photobucket.com/albums/e...4/100_0095.jpg
(sorry, picture kept failing when I tried to load it here)
http://i228.photobucket.com/albums/e...4/100_0095.jpg
(sorry, picture kept failing when I tried to load it here)