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 MANUALSSUBARU1996LEGACY WAGON 4WD F4-2.2L SOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSDESCRIPTION AND OPERATIONCONTROL SYSTEMGENERAL
1996 Subaru Legacy Wagon 4WD F4-2.2L SOHC
General
1996 Subaru Legacy Wagon 4WD F4-2.2L SOHCSECTION General
1. GENERAL
The ECM (Engine Control Module) receives signals sent from various sensors and switches to judge the engine operating condition and emits output signals to provide the optimum control and / or functioning of various systems.
Major items governed by the ECM are as follows:
- Fuel injection control
- Ignition system control
- Idle air control
- Canister purge control*
- EGR system control (AT model only)*
- Radiator fan control
- Fuel pump control
- Air conditioner cut control
- On-board diagnosis function
*: Canister purge control and EGR system control are described under "Emission Control".
The ECM (Engine Control Module) receives signals sent from various sensors and switches to judge the engine operating condition and emits output signals to provide the optimum control and / or functioning of various systems.
Major items governed by the ECM are as follows:
- Fuel injection control
- Ignition system control
- Idle air control
- Canister purge control*
- EGR system control (AT model only)*
- Radiator fan control
- Fuel pump control
- Air conditioner cut control
- On-board diagnosis function
*: Canister purge control and EGR system control are described under "Emission Control".
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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.