Without Scan Tool

DIAGNOSTIC LINE PROCEDURE
1. Turn ignition switch off, then attach a jumper to DLC terminal "H."
2. Attach a jumper wire to DLC terminal "A," then connect both jumper wires to each other.
3. Turn ignition switch to the "RUN" position.
4. Disconnect jumpers for approximately one second then reconnect jumpers for no less than one second intervals taking them apart briefly between intervals. Repeat this action four times within 10 seconds, leaving jumpers connected upon completion of the fourth interval. Check ANTI-LOCK indicator. Only Diagnostic Trouble Code 12 should be present. If not, diagnostic trouble codes have not been properly cleared; begin clearing procedures again. If diagnostic trouble codes are cleared, wait at least 15 seconds before turning ignition off.