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 MANUALSCHEVROLET1994LUMINA V6-204 3.4L DOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMRELAYS AND MODULES - IGNITION SYSTEMIGNITION CONTROL MODULEDESCRIPTION AND OPERATION
1994 Chevrolet Lumina V6-204 3.4L DOHC
Ignition Control Module: Description and Operation
1994 Chevrolet Lumina V6-204 3.4L DOHCSECTION Description and Operation
Typical Ignition Module Assembly:
PURPOSE
This DIS module monitors the crank sensor signals and based on these signals sends a reference signal to the ECM so that correct spark and fuel injector control can be maintained during all driving conditions.
OPERATION
During cranking, the DIS module monitors the "sync pulse" to begin the ignition firing sequence and below 400 rpm the module controls spark advance by triggering each of the three coils at a pre-determined interval based on engine speed only. Above 400 rpm the ECM controls the spark timing through the module (EST), and compensates for all driving conditions. The DIS module must receive a "sync pulse" and then a crank signal in that order to enable the engine to start. The DIS module is not repairable. When a module is replaced, the ignition coils must be transferred to the new module.
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.