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 MANUALSFORD2012MUSTANG V8-5.4L SCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMDESCRIPTION AND OPERATIONENGINE IGNITION
2012 Ford Mustang V8-5.4L SC
Engine Ignition
2012 Ford Mustang V8-5.4L SCSECTION Engine Ignition
Engine Ignition
The Electronic Ignition (EI) system is a coil-on-plug ignition system. The coil-on-plug ignition system consists of the:
- Crankshaft Position (CKP) sensor.
- Camshaft Position (CMP) sensor.
- ignition coils.
- spark plugs.
The CKP (Crankshaft Position) sensor:
- is a variable reluctance sensor.
- is mounted to the lower RH side of the front cover.
- 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 (Camshaft Position) sensor:
- is mounted on the LH side of the front cover.
- sends the PCM a signal indicating camshaft position used for fuel and spark synchronization.
The 8 separate ignition coils:
- convert low voltage signals from the PCM to high voltage pulses.
- produce the high voltage pulses for the spark plugs.
- are connected directly to each spark plug.
The spark plugs:
- convert a high voltage pulse into a spark which ignites the fuel and air mixture.
- originally installed on the vehicle have a 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.