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 MANUALSCADILLAC1997SEVILLE SLS V8-4.6L VIN YREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMIGNITION CONTROL MODULEDESCRIPTION AND OPERATION
1997 Cadillac Seville SLS V8-4.6L VIN Y
Ignition Control Module: Description and Operation
1997 Cadillac Seville SLS V8-4.6L VIN YSECTION Description and Operation
IGNITION CONTROL MODULE
The Ignition Control (IC) module performs several functions:
^ It monitors the "ON-OFF" pulses produced by the two crankshaft and one camshaft position sensors.
^ It creates a 4X and 24X reference signal (4X REF HI and 24X crank) sent to the PCM for ignition control.
^ It creates a camshaft reference signal (CAM HI) sent to the PCM for fuel injection control.
^ It provides a ground reference (REF LO, CAM LO) to the PCM.
^ It provides a means for the PCM to control spark advance (BYPASS and IGNITION CONTROL) called IGNITION CONTROL MODE.
^ It provides a limited means of controlling spark advance without PCM input, called MODULE MODE.
^ The IC module is not repairable. When a module is replaced, the remaining components must be transferred to the new module.
The PCM uses IC module information for fuel control, idle speed control and ignition control (which it outputs back to the IC module). A fault with any of these signals between the IC module and PCM will cause various driveability conditions and should set a DTC.
The Ignition Control (IC) module performs several functions:
^ It monitors the "ON-OFF" pulses produced by the two crankshaft and one camshaft position sensors.
^ It creates a 4X and 24X reference signal (4X REF HI and 24X crank) sent to the PCM for ignition control.
^ It creates a camshaft reference signal (CAM HI) sent to the PCM for fuel injection control.
^ It provides a ground reference (REF LO, CAM LO) to the PCM.
^ It provides a means for the PCM to control spark advance (BYPASS and IGNITION CONTROL) called IGNITION CONTROL MODE.
^ It provides a limited means of controlling spark advance without PCM input, called MODULE MODE.
^ The IC module is not repairable. When a module is replaced, the remaining components must be transferred to the new module.
The PCM uses IC module information for fuel control, idle speed control and ignition control (which it outputs back to the IC module). A fault with any of these signals between the IC module and PCM will cause various driveability conditions and should set a DTC.
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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.