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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 MANUALSCHEVROLET2001MONTE CARLO V6-3.8L VIN KREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMIGNITION CONTROL MODULEDESCRIPTION AND OPERATION
2001 Chevrolet Monte Carlo V6-3.8L VIN K
Ignition Control Module: Description and Operation
2001 Chevrolet Monte Carlo V6-3.8L VIN KSECTION Description and Operation
IGNITION COILS AND IGNITION CONTROL (IC) MODULE
Three dual tower ignition coils are mounted to the IC module, and are serviced individually. The IC module performs the following functions:
^ It supplies a power and low reference circuit to the CMP and CKP sensors
^ It receives and processes the signals generated by the CMP and CKP sensors
^ It determines the correct coil triggering sequence, based on how many 18X ON-OFF pulses occur during a sync pulse. This coil sequencing occurs at start-up, and is remembered by the IC module. After the engine is running, the module will continue to trigger the coils without the CKP input.
^ It determines the correct direction of the crankshaft rotation, and cuts spark and fuel delivery to prevent damage from backfiring if reverse rotation is detected.
^ It sends 18X and 3X reference signals to the PCM
The 3X reference signal is also known as the low resolution engine speed signal. This signal is generated by the IC module using an internal divide-by-six circuit. This circuit divides the 18X signal pulses by six. This divider circuit will not begin operation without a sync pulse present at start-up, and without 18X and 3X reference signals no fuel injection will occur.
Three dual tower ignition coils are mounted to the IC module, and are serviced individually. The IC module performs the following functions:
^ It supplies a power and low reference circuit to the CMP and CKP sensors
^ It receives and processes the signals generated by the CMP and CKP sensors
^ It determines the correct coil triggering sequence, based on how many 18X ON-OFF pulses occur during a sync pulse. This coil sequencing occurs at start-up, and is remembered by the IC module. After the engine is running, the module will continue to trigger the coils without the CKP input.
^ It determines the correct direction of the crankshaft rotation, and cuts spark and fuel delivery to prevent damage from backfiring if reverse rotation is detected.
^ It sends 18X and 3X reference signals to the PCM
The 3X reference signal is also known as the low resolution engine speed signal. This signal is generated by the IC module using an internal divide-by-six circuit. This circuit divides the 18X signal pulses by six. This divider circuit will not begin operation without a sync pulse present at start-up, and without 18X and 3X reference signals no fuel injection will occur.
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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.