My ABS acts strange. even when the key is off it makes sound. it turnes off if i disconnect ABS control unit or pull the fuse. The system itself is not working and light is on. anybody experienced this kind of problem?

 

yeah ive had that happen a few times in my 93. I usualy just pull the fuse and disconnect the negetive terminal to the battery for a few seconds to let everything reset and normaly it is good after that. I know others here have had that problem but I dont know of any official solution or diagnosis. Anyone know more ?

 

sounds like ABS control unit problem then. reseting doesnt work for me.

 

mine does that sometimes, i just pull the plug for a minute and its all good for awhile.

 

This happened to me once, it was a stuck ABS relay. I replaced it and the problem went away. I knew it was the relay because the ABS motor kept running even with the key out of the car.

 

not a relay in my case. the mechanic checked it, he also thought it was relay but it works.

 

I had the the same problem with mine...i just replaced the relay and my problem was solved but until I replaced it I just disconnected the battery when I parked it. Its a pain in the *** but it worked.

 

which relay exactly did you replace?

 

The ones in the abs hydro electrical unit. There are 2 relays under the black cover in the right hand corner of the engine bay. They are for the a abs valve and the other is for the pump motor.

 

The above statement is correct. Over time the abs pump relay will stick closed when it gets hot. If you pull the fuse & wait for the relay to cool down it will operate normal again (until the next time the relay gets hot & sticks closed)

Short story..............


I got the ABS light & experianced massive front brake lock during an autocross event.

When I opened the hood I could hear the ABS Motor running. Even after I shut engine off & removed the key, the ABS Motor just continued to run.

I pulled the ABS fuses (40 & 15 amp) from the fuse/relay box near the left strut tower. This shut the ABS Motor off, but I still had the light & some serious front brake bias.

With the engine still off I put the fuses back in & the ABS Motor started running again, so I pulled the fuses to save my battery. After a while (1/2hr or so) I put the fuses back in & all was back to normal. It stayed that way for a couple of months.

Then during a lapping day I got massive front brake lock up (the right front tire taking the brunt) & ended up flat spotting my R compound tire to the cord. The F*cking ABS light was on again. Back in the pits, with the hood up, I could hear the ABS Motor running.

The ABS Hydro Electrical unit (r/h corner of the engine compartment, has two relays under the black plastic cover. One is for the Pump Motor & the other is for the Valve.

I removed & tested both relays on the bench with voltage. They operated normally. I heated the Pump Motor relay up to 250' F & applied voltage. The damn thing stuck closed. After it cooled down it snapped open.

That's why the system would return to normal if I waited prior to reinstalling the fuses.

During normal street driving you don't cycle the ABS much, if at all. On the track it must be cycling & generating a bunch of heat (due to high resistance & poor contact).

Summary?

I replaced both relays in the ABS Hydro Elect unit. They cost around $60 for the pair. They originals lasted 13 years, not to bad in my book.


ABS Motor Relay: NA23-43-7A2
ABS Valve Relay: NA23-43-7A3

 

Sled Driver
good input thanks a lot. we pulled the relay from ABS hydraulic unit too and tested it but it operated normaly. My ABS is not working no matter if its hot or cold. In my case the strange thing is that THE MOTOR STOPS WORKING WHEN I TURN THE IGNITON ON. Thats insane. Anyway, I will replace relays and see what happens.

 

tried another relay, the one that caused abs pump motor to run but no change. its still runing even when the key is out