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 MANUALSMERCURY2009MILAN PREMIER, 3.0 1, AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 629 (VEHICLE DYNAMIC SYSTEMS)DIAGNOSIS AND TESTINGANTI-LOCK CONTROLSYMPTOM CHART

2009 Mercury Milan Premier, 3.0 1, AWD

Symptom Chart

2009 Mercury Milan Premier, 3.0 1, AWDSECTION Symptom Chart

WARNING: This page is about a different car, the 2006 Mercury Milan, 2006 Lincoln Zephyr, and 2006 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.

SYMPTOM CHART

Condition	Possible Sources	Action
No communication with the anti-lock brake system (ABS) module	Smart junction box (SJB) fuse 28 (10A) Circuitry ABS module	GO to PINPOINT TEST A .
No communication with the instrument cluster	Circuitry Instrument cluster	REFER to INSTRUMENT CLUSTER to continue diagnosis of the instrument cluster.
The red brake warning indicator does not self-check	Instrument cluster	REFER to INSTRUMENT CLUSTER .
The red brake warning indicator stays on when the ignition switch is in RUN	Circuitry Low brake fluid warning switch Parking brake switch Instrument cluster	REFER to INSTRUMENT CLUSTER .
The yellow ABS warning indicator is always on	Circuitry Instrument cluster ABS module	GO to PINPOINT TEST G .
Spongy brake pedal with no warning indicator	Air in the brake hydraulic system	GO to PINPOINT TEST H .
Poor vehicle tracking during anti-lock function	Air in the hydraulic brake system Hydraulic control unit (HCU)	GO to PINPOINT TEST I .
Poor vehicle tracking during anti-lock function	Base brake system	REFER to BRAKE SYSTEM-GENERAL INFORMATION .
False ABS activation with no DTCs present	Incorrect or worn tires Underinflated tire(s) Non-OEM suspension components Missing, damaged or misaligned wheel speed sensor tone rings	INSPECT the wheels and tires, front and rear suspension and the wheel speed sensor tone rings. REPAIR or INSTALL new as necessary.
The traction control system is inoperative	Traction control system is turned off	MAKE SURE the system is turned on. CARRY OUT the ABS module self-test. CHECK for DTCs. REFER to ANTI-LOCK BRAKE SYSTEM (ABS) MODULE DIAGNOSTIC TROUBLE CODE (DTC) CHART .
	Traction control system is not configured	CHECK the PCM configuration. REFER to MODULE CONFIGURATION .
	ABS wheel speed sensor fault	CARRY OUT the ABS module self-test. CHECK for DTCs. REFER to ANTI-LOCK BRAKE SYSTEM (ABS) MODULE DIAGNOSTIC TROUBLE CODE (DTC) CHART .
	CAN communications bus fault	CHECK for DTCs. REFER to MODULE COMMUNICATIONS NETWORK .
The traction control warning indicator is always on	Traction control system is turned off	MAKE SURE the system is turned on. CARRY OUT the ABS module self-test. CHECK for DTCs. REFER to ANTI-LOCK BRAKE SYSTEM (ABS) MODULE DIAGNOSTIC TROUBLE CODE (DTC) CHART .
	Traction control system is not configured	CHECK the PCM configuration. REFER to MODULE CONFIGURATION .
	ABS wheel speed sensor fault	CARRY OUT the ABS module self-test. CHECK for DTCs. REFER to ANTI-LOCK BRAKE SYSTEM (ABS) MODULE DIAGNOSTIC TROUBLE CODE (DTC) CHART .
	Instrument cluster	GO to PINPOINT TEST J .
The traction control system cannot be disabled/enabled	Circuitry Traction control switch Instrument cluster	GO to PINPOINT TEST J .

RENDER: 1.0x

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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.