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 MANUALSMAZDA1991PROTEGE L4-1839CC 1.8L SOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMRELAYS AND MODULES - IGNITION SYSTEMIGNITION CONTROL MODULEDESCRIPTION AND OPERATION
1991 Mazda Protege L4-1839cc 1.8L SOHC
Ignition Control Module: Description and Operation
1991 Mazda Protege L4-1839cc 1.8L SOHCSECTION Description and Operation
Igniter Circuit Diagram:
The Igniter, located near the coil on the left side of the engine compartment, is a switching device that activates the primary ignition coil circuit. The ECU determines optimum ignition timing from various inputs and transmits a primary current "OFF" signal to the igniter to control ignition timing.
The ECU calculates input from these devices to control ignition timing:
Distributor Ne signal
Water thermosensor
Airflow meter
Throttle sensor
Neutral and clutch switches (M/T)
Inhibitor switch (A/T)
Ignition switch ("START" position)
Diagnosis connector (for base timing adjustment)
EC-AT control unit
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.