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 1330 (STARTING SYSTEM)DIAGNOSTIC TESTSSTARTING 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 2010 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.

Symptom Chart

Condition	Possible Sources	Action
The engine does not crank	Battery Starter motor Digital Transmission Range (TR) sensor Starter motor relay Ignition switch PCM Fuse(s) Anti-theft system Circuitry	Go to Pinpoint Test A .
Unusual starter noise	Starter motor mounting Starter motor Flexplate/ring gear	Go to Pinpoint Test B .
The engine cranks slowly	Battery Starter motor Circuitry	CARRY OUT the Starter Motor - Motor Feed Circuit and Motor Ground Circuit Component Test. REFER to Starter Motor - Component Tests .
The starter spins but the engine does not crank	Starter motor	INSPECT the starter motor mounting and engagement. REPAIR as necessary.
	Damaged flexplate/ring gear teeth	INSPECT the flexplate/ring gear for damaged, missing or worn teeth. REPAIR as necessary.
The engine cranks in reverse and other forward gears	Shift linkage (adjustment)	REFER to DIAGNOSTIC TESTS article.
	Digital TR sensor	REFER to DIAGNOSTIC TESTS article.

RENDER: 1.0x

NO RELATED

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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.