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 MANUALSFORD1999EXPEDITION 2WD V8-4.6L SOHC VIN 6REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTRELAYS AND MODULES - POWERTRAIN MANAGEMENTRELAYS AND MODULES - IGNITION SYSTEMIGNITION CONTROL MODULEDESCRIPTION AND OPERATION
1999 Ford Expedition 2WD V8-4.6L SOHC VIN 6
Ignition Control Module: Description and Operation
1999 Ford Expedition 2WD V8-4.6L SOHC VIN 6SECTION Description and Operation
PURPOSE
- The Ignition Control Module (ICM) is incorporated within the Powertrain Control Module (PCM). The ICM receives engine position and speed information from within the crankshaft position sensor and desired spark advance information from the PCM.
OPERATION
- The ICM synthesizes a profile ignition pick up signal and ignition diagnostic monitor signal for use within The PCM.
- The PCM uses this information to determine which ignition coil to fire, calculating the turn ON/OFF times of the ignition coil required to achieve the correct dwell and spark advance.
- The Ignition Control Module (ICM) is incorporated within the Powertrain Control Module (PCM). The ICM receives engine position and speed information from within the crankshaft position sensor and desired spark advance information from the PCM.
OPERATION
- The ICM synthesizes a profile ignition pick up signal and ignition diagnostic monitor signal for use within The PCM.
- The PCM uses this information to determine which ignition coil to fire, calculating the turn ON/OFF times of the ignition coil required to achieve the correct dwell and spark advance.
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.