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.
1997 Subaru Legacy Outback, AutomaticFACTORY OEM SERVICE PROCEDURE
DTC P1440 (PCV_Flow): Fuel Tank Pressure Control System Function Problem Low Input
- Turn ignition off. Connect test mode connector under instrument panel. Turn ignition on. Listen for clicking sound from pressure control solenoid (located under fuel tank). If clicking sound is heard, go to next step. If clicking sound is not heard, replace pressure control solenoid.
- Turn ignition off. Check fuel filler cap for tightness. Check for damaged or broken seal in filler cap. Replace as necessary. If filler cap is okay, go to next step.
- Turn ignition on. Listen for clicking sound from vent control solenoid (located near EVAP canister, near fuel tank). If clicking sound is present, go to next step. If clicking sound is not present, replace vent control solenoid.
- Listen for clicking sound from purge control solenoid (located under intake runner). If clicking sound is heard, go to next step. If clicking sound is not heard, replace purge control solenoid.
- Turn ignition off. Check fuel line for leaks, damage to canister, leaks or plugged evaporative system hoses, or leak in fuel tank. Repair or replace as necessary.
Factory Service Tools
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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.
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