Anti-Lock Brake Control Module Inoperative

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

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

POSSIBLE SOURCE(S):
- Leaky dump valve (soft).

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

POSSIBLE SOURCE(S):
- Leaky isolation valve during RABS stop (soft).

ACTION(S) TO TAKE:
- Refer to Drive Test Code 5, step DT5.4 only. DT5.4 Verify Proper RABS Operation In 4X2