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 MANUALSSUBARU2014OUTBACK 2.5I, STANDARD TRANSREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEENGINE CONTROL SYSTEMSFUEL INJECTION SYSTEM - MECHANISM & FUNCTION (H4SO)CONTROL SYSTEMINPUT AND OUTPUT SIGNALS
2014 Subaru Outback 2.5i, Standard Trans
Input And Output Signals
2014 Subaru Outback 2.5i, Standard TransSECTION Input And Output Signals
| Signal | Unit | Function |
|---|---|---|
| Input signals | Manifold absolute pressure sensor | Detects the pressure of intake air (measures the absolute pressure). |
| Mass air flow and intake air temperature sensor | Detects the temperature and amount of intake air. | |
| Throttle position sensor | Detects the throttle valve position. | |
| Front oxygen (A/F) sensor | Detects the density of oxygen in exhaust gases at the upstream of the front catalytic converter. | |
| Front oxygen sensor Rear oxygen sensor |
Detects the density of oxygen in exhaust gases at the downstream of the front catalytic converter. | |
| Crankshaft position sensor | Detects the crankshaft angular position. | |
| Camshaft position sensor | Detects the combustion cylinder. | |
| Engine coolant temperature sensor | Detects the engine coolant temperature. | |
| Knock sensor | Detects engine knocking. | |
| Accelerator pedal position sensor | Indicates the accelerator pedal position. | |
| Ignition switch | Detects operation of the ignition switch. | |
| Starter switch | Detects the condition of engine cranking. | |
| Neutral position switch (MT) | Detects that the gear is in neutral. | |
| Inhibitor switch (AT) | Detects shift positions. | |
| A/C switch | Detects ON-OFF operation of the A/C switch. | |
| Fuel temperature sensor | Detects the temperature of the fuel in the fuel tank. | |
| Fuel level sensor | Detects the level of the fuel in the fuel tank. | |
| Fuel tank pressure sensor | Detects the evaporation gas pressure in the fuel tank. | |
| A/C mid pressure switch | Detects operation of the A/C mid pressure switch. | |
| Wiper switch | Detects ON-OFF operation of the wiper switch. | |
| Power steering switch | Detects operation of the power steering switch. | |
| Small light switch | Detects ON-OFF operation of the small light switch. | |
| Blower fan switch | Detects ON-OFF operation of the blower fan switch. | |
| Rear defogger switch | Detects ON-OFF operation of the rear defogger switch. | |
| Output signals | Fuel injector | Activates an injector. |
| Ignition signal | Turns the primary current to the ignition coil ON or OFF. | |
| Electronic control throttle | Controls motor output for the electronic control throttle. | |
| Fuel pump relay | Turns ON or OFF the fuel pump relay. | |
| A/C control relay | Turns ON or OFF the A/C control relay. | |
| Radiator fan control relay | Turns ON or OFF the radiator fan control relay. | |
| Tumble generator valve actuator | Operates the tumble generator valve. | |
| Engine warning light | Indicates existence of abnormality. | |
| Purge control solenoid valve | Controls purge of evaporative gas absorbed by the canister. | |
| EGR valve | Adjusts the exhaust gas circulating flow to the intake pipe. | |
| Heater circuit of front and rear oxygen sensors | Controls heater of front and rear oxygen sensors. | |
| Pressure control solenoid valve | Controls evaporation pressure in the fuel tank. | |
| Drain valve | Closes the evaporation line between the fuel tank and canister to detect leakage of evaporation gas. | |
| Power supply | Controls ON/OFF of the main power supply relay. |
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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.