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.
2020 Subaru Forester BaseFACTORY OEM SERVICE PROCEDURE
Inspection Mode H
| DTC | Item | Condition |
|---|---|---|
| P2797 | ELECTRIC/AUXILIARY TRANSMISSION FLUID PUMP "A" PERFORMANCE/STUCK OFF | - |
Diagnostic procedure:
- Start the engine with the select lever in "N" or "P" range.
- Set ATF temperature to 60 - 80°C (140 - 176°F).NOTE: Check the ATF temperature using the Subaru Select Monitor.
- Stop the engine and leave it for three minutes or more.
- Turn the ignition switch to ON (engine OFF).
- Using the Subaru Select Monitor, read and record the value in [secondary pressure sensor voltage.]. Ref. to TRANSMISSION (DIAGNOSTICS)>DATA MONITOR .NOTE: This voltage is "A".
- Start the engine.
- Shift the select lever to "D" range and set the vehicle to the Auto Start Stop status by Auto Start Stop function.NOTE: At this time, check that the engine is stopped, securely make sure that the electric oil pump is rotating with operating sound.
- After stopping the engine, leave it for five seconds or more, read [secondary pressure sensor voltage.] using the Subaru Select Monitor during Auto Start Stop and record it when the hydraulic pressure stabilizes. Ref. to TRANSMISSION (DIAGNOSTICS)>DATA MONITOR .NOTE: This voltage is "B".
- Calculate the voltage difference between the A/D value measured when the electric pump is in operation and the one measured when in halt condition.
Voltage difference (V): 0.045 V or more
V = B - A
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.