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 MANUALSSUBARU1991XT 4WD F4-1781CC 1.8L SOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMRELAYS AND MODULES - IGNITION SYSTEMIGNITION CONTROL MODULEDESCRIPTION AND OPERATIONIGNITION SIGNAL
1991 Subaru XT 4WD F4-1781cc 1.8L SOHC
Ignition Signal
1991 Subaru XT 4WD F4-1781cc 1.8L SOHCSECTION Ignition Signal
Ignition Control System:
PURPOSE
The ignition signal is used by the ECU to control the ignitor unit. This allows ignition triggering to be accomplished with a relatively low current signal from the ECU.
OPERATION
A signal is sent to the ignitor module whenever the engine is running. The signals are an on/off pulse, telling the ignitor when to fire the ignition coil.
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.