Originally Posted by ledgebmx

Generally it will cut on if any of the wheels are not going the same speed as the other ones. Power braking, stopping fast, and a few other things can cause it to light up when it is working properly. It could simply be that the system is starting to fail. It could also be the wiring or the piping.

Originally Posted by Sled Driver

The ABS system isn't rotary specific.........

In other words, you can take it to the dealer & have him hook up his magic machine to diagnose the problem.........

You can guess all you want. The FSM has a wonderful troubleshooting section, but you need to get ahold of alot of the special tools listed.

But beware...........You now have extremely front brake bias with no ABS. You will rear-end someone if your not careful. I would get it fixed ASAP.

Short story


I got the ABS light & experianced massive front brake lock up after the finish line at a autocross event.

When I opened the hood I could hear the ABS Motor running. Even after I shut engine off, the ABS Motor 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.

When I put the fuses back in the ABS Motor started running again, so I pulled the fuses to save my battery. After a while, 1/2- 1 hr, 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 taking the brunt) & ended up flat spotted 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 plastic cover. One is for the Pump Motor & the other is for the Valve.

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

That's why the system would return to normal if I waited to put the fuses back in.

During normal street driving you don't get into the ABS much, if at all. On the track it must be cycling on & off a bunch.

Summary? I replaced both relays in the ABS Hydro Elect unit. They cost around $60 for the pair.

Originally Posted by Sled Driver

The ABS system has two relays in the hydro mechanical unit (Black box under the hood in the r/h aft corner with a bunch of brake lines connected to it).

One is for the pump motor & the other is for the valve.

If one of those fails (even intermittanly) the light will come on.

From a previous post I replied to...............



https://www.rx7club.com/showthread.php?t=608738

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

Originally Posted by RX7_rotary

I have the same problem. ABS warning light is on in orange color.
But my ABS rear sensor wire is torn. Is this one be reason of warning?

Originally Posted by BLKTOPTRVL

~a month ago, the ABS warning light came on and stayed on for about 2 minutes.

It did not come one again until two days ago when it was on for about 15 minutes (until I shut off the car).

It has not come on since.

If history repeats itself and the ABS behaves like other systems, I would expect now that the light will come on again soon, and then more and more until it stays on.

Anybody know of a common cause for this warning light to come on?

Originally Posted by jkstill

Do a search on this.

If you have bled your brakes recently, could just be air in the lines.

Same thing happened to me when I replaced the front brake system.