Antilock Brake Control Module Valve Inoperative

POSSIBLE SOURCE(S):
- Leaky dump valve.

ACTION(S) TO TAKE:
- Refer to Drive Test Code 4, step DT4.3. DT4.3 RABS Hydraulic Valve Leak Test

POSSIBLE SOURCE(S):
- Stuck shut isolation valve.

ACTION(S) TO TAKE:
- Refer to Drive Test Code 4, Step DT4.5 ONLY. DT4.5 Blocked Isolation Orifice