TM 9-2320-302-20 0013 00-8 ANTI-LOCK BRAKE SYSTEM TROUBLESHOOTING AND TESTING - CONTINUED 0013 00 DIAGNOSTICS - CONTINUED 4. Clear Mode. a. To erase faults from the ECU, you must be in the clear mode. To enter the clear mode, press and hold the blink code switch for at least three seconds, then release. b. If the system displays eight quick flashes followed by a system configuration code, the clear was successful. The ABS fault has been cleared from memory. c. If you do not receive eight flashes, there are still active faults that must be repaired before they can be cleared. 5. Blink Code Diagnostic Procedures. For the step-by-step blink code diagnostic procedure, see Table 3. Table 3. Blink Code Diagnostic Procedure. MODE PROCEDURE SYSTEM RESPONSE ACTION Diagnostic Step 1. Turn the ignition on. The  ABS  warning  lamp  comes  on momentarily then goes out, indicating System Okay. No recognizable faults in the ABS. No action required. The   ABS   warning   lamp   does   not light, indicating possible wiring fault or burned-out bulb. Inspect  the  wiring.  Inspect  the  bulb. Make necessary repairs. The   ABS   warning   lamp   stays   on, indicating there is a fault, or faults, in the system. Continue with the blink code diagnostics. Go to the next step. Step  2.   Press   and   hold   the Blink   Code   Switch   for   one second, then release. The    ABS    warning    lamp    begins flashing two-digit blink codes(s). Determine   if   the   fault   is   active   or stored: Active Fault: The lamp will repeatedly display one code. Stored  Fault:  The  lamp  will  display the code for each stored fault then stop blinking. Faults will be displayed one at a time. Step  3.  Count  the  flashes  to determine the blink code. First Digit: 1 to 8 flashes; Pause (1-1/ 2   seconds).   Second   Digit:   1   to   6 flashes; pause (4 seconds). Turn     the     ignition     off.     Find     the definition for the blink code in Table 2. Step 4. Repair and record the faults. Active Fault. Make the necessary repairs. Repeat the first three steps of this procedure until System Okay Code (1-1) is received. Stored Faults. Record for future reference. NOTE: The last fault code stored is the first fault code displayed. Clear Step  5.  Clear  faults  from  the memory:  Press  and  hold  the blink  code  switch  for  at  least three seconds, then release. The ABS warning lamp flashes eight times. All   faults   are   successfully   cleared. Turn the ignition off. Eight flashes are not received. Active faults still exist. Repeat the first four steps of this procedure.