Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSMERCURY2001SABLE LS, 4D SEDAN, 3.0 U, AX4SREPAIR AND DIAGNOSISBRAKESTRACTION CONTROLANTI-LOCK BRAKE SYSTEM CONTROLDIAGNOSTIC TESTSTEST K: POOR VEHICLE TRACKING DURING ABS OPERATION
2001 Mercury Sable LS, 4D Sedan, 3.0 U, AX4S
Test K: Poor Vehicle Tracking During Abs Operation
2001 Mercury Sable LS, 4D Sedan, 3.0 U, AX4SSECTION Test K: Poor Vehicle Tracking During Abs Operation
- Bleed brake System
Bleed brake system. See BLEEDING BRAKE SYSTEM . If vehicle still does not track properly, go to next go to next step. If vehicle tracks properly after bleeding brakes, problem is corrected. - Check Left Front ABS Inlet Valve (Closed Position)
Raise and support vehicle. Rotate all 4 wheels to ensure free rotation. Turn ignition on. Using scan tool, trigger ABS control module active command LF INLET ON. Moderately apply brake pedal. Have an assistant attempt to rotate left front wheel. If wheel rotates, trigger active command LF INLET OFF and go to next step. If wheel does not rotate, replace HCU. Clear codes and repeat self-test. - Check Left Front ABS Inlet Valve (Open Position)
While rotating left front wheel, moderately apply brake pedal. If left front wheel rotates, replace HCU. Repeat self-test. If left front wheel does not rotate, go to next step. - Check Left Front ABS Output Valve (Open Position)
Apply moderate brake pedal. Using scan tester, command LF INLET ON. Command ABS POWER ON for 6 seconds. Trigger must be depressed 3 times. Each press runs pump for 2 seconds. Command ABS control module LF OUTLET, ON and then OFF 3 times. With help from an assistant, attempt to rotate left front wheel. If wheel does not rotate, replace HCU. Repeat self-test. If wheel rotates, trigger all active commands OFF and go to next step. - Check Left Front ABS Outlet Valve (Closed Position)
Apply moderate brake pedal effort. With help from an assistant attempt to rotate left front wheel. If wheel rotates, replace HCU. Repeat self-test. If wheel does not rotate, repeat test from step 2 for RF, LR and RR wheels using commands specified. If no failure occurs, the system is operating normally.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.