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 MANUALSSUBARU2002LEGACY GT WAGON AWD F4-2.5L SOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSDESCRIPTION AND OPERATIONCONTROL SYSTEM
2002 Subaru Legacy GT Wagon AWD F4-2.5L SOHC
Control System
2002 Subaru Legacy GT Wagon AWD F4-2.5L SOHCSECTION Control System
GENERAL
The ECM receives signals from various sensors, switches, and other control modules. Using these signals, it determines the engine operating conditions and if necessary, emits signals to one or more systems to control them for optimum operation.
Major control items of the ECM are as follow:
- Fuel injection control
- Ignition system control
- Idle air control
- Fuel pump control
- Canister purge control * (1)
- Radiator fan control * (2)
- On-board diagnosis function
* 1: Canister purge control is described under "Emission Control (Aux. Emission Control Devices) Evaporative Emission Control System".
* 2: Radiator fan control is described under "Cooling".
The ECM receives signals from various sensors, switches, and other control modules. Using these signals, it determines the engine operating conditions and if necessary, emits signals to one or more systems to control them for optimum operation.
Major control items of the ECM are as follow:
- Fuel injection control
- Ignition system control
- Idle air control
- Fuel pump control
- Canister purge control * (1)
- Radiator fan control * (2)
- On-board diagnosis function
* 1: Canister purge control is described under "Emission Control (Aux. Emission Control Devices) Evaporative Emission Control System".
* 2: Radiator fan control is described under "Cooling".
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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.