Best bet is probably to take it in and get the computer diagnostic, both for this and the traction control the systems are 'linked' so a fault in the abs can cause the error light on trac and abs.
It may be the wheel sensors, only way to tell which one if that is the problem is to get the diagnostic.
Not sure if this is the way on your 93 but Try the key-code procedure:
To obtain fault codes using the Check Engine Light:
1. Cycle ignition key to ON, OFF, ON, OFF, ON within 5 second (do not crank engine)
2. Count the number of times the check engine light flashes on and off. The number of flashes represents the trouble code. There is a slight pause between the flashes representing the first and second digits of the code. Longer pauses seperate the individual two digit trouble code.
IE: Light flashes 3 times, pauses, then flashes 2 times. This is a code 32.
3. Light will always flash 55 at the end of the test. This signals the end of the test.
I didn't see a code for the wheel sensors but it might give you something helpful before taking it in.