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 VARIANT/TRIMSECTION 9 (ENGINE IGNITION SYSTEM - 2.3L)DESCRIPTION AND OPERATIONENGINE IGNITION
2009 Mercury Milan Premier, 3.0 1, AWD
Engine Ignition
2009 Mercury Milan Premier, 3.0 1, AWDSECTION Engine Ignition
WARNING: This page is about a different variant/trim than selected.
The electronic ignition (EI) system is a coil-on-plug ignition system. The coil-on-plug ignition system consists of the:
- coil-on-plug.
- spark plugs.
- crankshaft position (CKP) sensor.
- camshaft position (CMP) sensor.
The coil-on-plugs:
- change low voltage signals from the PCM to high voltage pulses.
- produce the high voltage pulses to the spark plugs.
- are connected directly to each spark plug.
The spark plugs:
- change high voltage pulses into a spark which ignites the fuel and air mixture.
The CKP sensor:
- is a variable reluctance sensor.
- is triggered by a 36-minus-1 tooth trigger wheel mounted on the crankshaft.
- provides base timing and crankshaft speed (RPM) to the PCM.
The CMP sensor:
- is a Hall-effect sensor.
- provides camshaft rotational location information to the PCM.
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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.