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 MANUALSMERCURY2010MARINER HYBRID, AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 251 (STEERING SYSTEM-GENERAL INFORMATION)DIAGNOSIS AND TESTINGSTEERING SYSTEMSYMPTOM CHART

2010 Mercury Mariner Hybrid, AWD

Symptom Chart

2010 Mercury Mariner Hybrid, AWDSECTION Symptom Chart

WARNING: This page is about a different car, the 2006 Mercury Grand Marquis and 2006 Ford Crown Victoria. 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 variable assist power steering (VAPS) module	Circuitry VAPS module	GO to PINPOINT TEST G .
No communication with the air suspension module	Circuitry Air suspension module	REFER to MULTIFUNCTION ELECTRONIC MODULES .
Steering system noise	Low fluid level Fluid aeration Steering gear Power steering pump Loose or damaged steering linkage Loose or damaged suspension component(s) Steering column Steering column boot bearing Intermediate shaft Loose dash boot seal	GO to PINPOINT TEST C .
Steering is very difficult/ very easy	Seized steering column shaft U-joint(s) Damaged, fractured steering column bearing(s) Steering gear Power steering pump Power steering hose(s) Binding dash boot seal	GO to PINPOINT TEST D .
Excessive steering wheel play	Steering gear Steering column Steering column shaft Steering linkage Ball joint(s) Strut bearing plate (if applicable) Binding dash boot seal	GO to PINPOINT TEST E .
Steering system drift/pull/wander	Tire pressure Unevenly loaded vehicle	CORRECT the vehicle loading as necessary.
Steering system drift/pull/wander	Wheel alignment Steering gear Steering column intermediate shaft Frame alignment	GO to PINPOINT TEST F .

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.