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 1524 (ENGINE IGNITION SYSTEM - 3.0L)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 car, the 2010 Mercury Milan and 2010 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
The Electronic Ignition (EI) system is a coil-on-plug ignition system. The coil-on-plug ignition system consists of the:
- Camshaft Position (CMP) sensor.
- Crankshaft Position (CKP) sensor.
- ignition coil-on-plugs.
- spark plugs.
The CMP sensor:
- is a Hall-effect sensor.
- is mounted in the front cover.
- is triggered by the high point mark on the LH exhaust camshaft.
- sends the PCM a signal indicating camshaft position used for fuel synchronization.
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.
- is essential for calculating spark timing.
The ignition 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.
- originally equipped on the vehicle have a fine wire design platinum-enhanced active electrode for long life.
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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.