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 MANUALSCADILLAC2002ELDORADO V8-4.6L VIN YREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMIGNITION CONTROL MODULEDESCRIPTION AND OPERATION
2002 Cadillac Eldorado V8-4.6L VIN Y
Ignition Control Module: Description and Operation
2002 Cadillac Eldorado V8-4.6L VIN YSECTION Description and Operation
IGNITION COIL/ICM ASSEMBLY
Each Ignition Control Module (ICM) has the following circuits:
^ An ignition 1 voltage circuit
^ A chassis ground
^ An ignition control circuit for each cylinder
^ A low reference circuit
The PCM controls spark by pulsing the ignition control circuits to the ICM to trigger the coils and tire the spark plugs. The PCM and ICM are internally protected against shorts to power and ground on the ignition control circuits.
The spark plugs are connected to each coil by a short boot. The boot contains a spring that conducts the spark energy from the coil to the spark plug. The spark plugs are tipped with platinum for long wear and higher efficiency.
Each Ignition Control Module (ICM) has the following circuits:
^ An ignition 1 voltage circuit
^ A chassis ground
^ An ignition control circuit for each cylinder
^ A low reference circuit
The PCM controls spark by pulsing the ignition control circuits to the ICM to trigger the coils and tire the spark plugs. The PCM and ICM are internally protected against shorts to power and ground on the ignition control circuits.
The spark plugs are connected to each coil by a short boot. The boot contains a spring that conducts the spark energy from the coil to the spark plug. The spark plugs are tipped with platinum for long wear and higher efficiency.
RENDER: 1.0x
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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.