How to check if the ABS works?
Thread Starter
Melting Slicks
Joined: Jan 2002
Posts: 2,238
Likes: 4
From: Milan
How to check if the ABS works?
I had for two weeks te ABS service lite on. Yesterday the problem is gone..(I don't know why.... :confused: )
But I'm not sure if the ABS works!
Ther's a SAFETY way to test the ABS?
-Beppe-
But I'm not sure if the ABS works!
Ther's a SAFETY way to test the ABS?
-Beppe-
Melting Slicks
Joined: May 2001
Posts: 2,143
Likes: 7
From: San Diego CA
Re: How to check if the ABS works? (conv90)
The ABS will self test when you start the car and hit 3MPH. You should here the pump noise.
Check your brake fluid level. Topping it off should stop the ABS light. If it's low it's probably time to replace the pads and flush the old fluid out.
Check your brake fluid level. Topping it off should stop the ABS light. If it's low it's probably time to replace the pads and flush the old fluid out.
Burning Brakes
Joined: Feb 2000
Posts: 824
Likes: 2
From: Camden SC
Re: How to check if the ABS works? (John Row)
Buon giorno (good evening)
The 1990 will store ABS codes. You will need to retrieve the codes from the computer. Do you have the service manual?
Once you retrieve the codes, trouble shooting a little easier. Let us know the codes.
As far as an operational check, ah, you could find some rain slicked parking lot, snow covered parking lot, ice covered parking lot, etc. Then at about 15 miles per hour, try to lock up the brakes. You should feel the pedal pulsating as fluid is returned to the reservoir. I would not try this on dry ground.
If you have a Tech 1A scanner with Bosch connector, you can check each wheel solenoid. This of course requires the tester and two people.
Let us know.
Buona fortuna (good luck)
dlmeyers 90 coupe zf6 3 speed shocks
The 1990 will store ABS codes. You will need to retrieve the codes from the computer. Do you have the service manual?
Once you retrieve the codes, trouble shooting a little easier. Let us know the codes.
As far as an operational check, ah, you could find some rain slicked parking lot, snow covered parking lot, ice covered parking lot, etc. Then at about 15 miles per hour, try to lock up the brakes. You should feel the pedal pulsating as fluid is returned to the reservoir. I would not try this on dry ground.
If you have a Tech 1A scanner with Bosch connector, you can check each wheel solenoid. This of course requires the tester and two people.
Let us know.
Buona fortuna (good luck)
dlmeyers 90 coupe zf6 3 speed shocks
Thread Starter
Melting Slicks
Joined: Jan 2002
Posts: 2,238
Likes: 4
From: Milan
Re: How to check if the ABS works? (dlmeyers)
The 1990 stores ABS codes??
I have an Haynes 85/96 manual with the explanation of all codes.
On all description of codes I haven't found codes with Abs trobles.
Codes are from 12 to 55 (If I remember... I will check the manual)
I have no codes stored on ECM (taken from the connector under the dash).
Which are codes about ABS??
Thanks - Beppe-
I have an Haynes 85/96 manual with the explanation of all codes.
On all description of codes I haven't found codes with Abs trobles.
Codes are from 12 to 55 (If I remember... I will check the manual)
I have no codes stored on ECM (taken from the connector under the dash).
Which are codes about ABS??
Thanks - Beppe-
Racer
Joined: Apr 2002
Posts: 389
Likes: 0
From: Micco FL
Re: How to check if the ABS works? (John Row)
Ditto to all that was said above..."3 MPH self test...maybe low on fluid...extract the codes." And here is one more to add to the list. Get on some grass going about 10 MPH and hit the binders, you should hear the pump going in the back, and see the light come on.
These things almost NEVER go bad. Most likely brake fluid, however I will share this with you. I was getting ASR/ABS codes along with a bunch of others and nothing was wrong with the system that a ECM didn't fix.
These things almost NEVER go bad. Most likely brake fluid, however I will share this with you. I was getting ASR/ABS codes along with a bunch of others and nothing was wrong with the system that a ECM didn't fix.
Le Mans Master
Joined: Jul 2002
Posts: 5,818
Likes: 2
From: Alive and well in Burlington NC
Re: How to check if the ABS works? (conv90)
Beppe,
On the 1990 and 1991 model, shorting pin "H" to pin "A" on the ALDL will cause the ABS light to flash ABS codes.
http://www.c4vettes.com/codes.htm will explain with a diagram of which pins to short.
Let us know what code are present (if any).
Or as stated above, find a big, wet parking lot and try to lock 'em up.
On the 1990 and 1991 model, shorting pin "H" to pin "A" on the ALDL will cause the ABS light to flash ABS codes.
http://www.c4vettes.com/codes.htm will explain with a diagram of which pins to short.
Let us know what code are present (if any).
Or as stated above, find a big, wet parking lot and try to lock 'em up.
