Subaru Transmission Workshop Manual.  Diagnostics and Maintenance

This section contains a detailed guide to diagnosing, repairing and servicing Subaru transmissions. Includes specifications, diagnostic procedures, repair recommendations and tips for extending the life of the transmission.

What's in the guide?

⚙️ Subaru transmission types - manual (MT), automatic (AT), Lineartronic continuously variable transmission (CVT)

🔍 Troubleshooting - noises, jerks, errors, oil leaks

🛠 Component repair and replacement - clutch, planetary mechanisms, torque converter

💡 Maintenance - oil change, adjustments, calibration

📡 Electronic systems - sensors, control units, OBD-II errors

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✅ 4-speed automatic (4EAT)

Used on Legacy, Forester, Impreza, Outback until 2008

Reliable, but not very economical

✅ 5-speed automatic (5EAT)

Installed on Subaru Outback 3.0/3.6R, Legacy, Tribeca

More modern, with adaptive shift logic

✅ Subaru High Torque CVT (HTCVT)

Improved version of the variator for powerful engines

✅ Lineartronic TR580 (standard CVT)

Used on Legacy, Outback, Forester, Impreza with 2.0 and 2.5L engines

Economical and smooth operation

✅ Lineartronic TR690 (reinforced CVT)

Installed on Outback 3.6R, Legacy 3.6R

Designed for more powerful engines

✅ Lineartronic TR580 e-CVT (hybrid CVT)

Used on Subaru hybrid models

✅ 5-speed manual transmission (5MT)

Installed on Impreza, Legacy, Forester, Outback

Reliable and simple design

Used with all-wheel drive (AWD)

✅ 6-speed manual transmission (6MT)

Used on Subaru WRX, WRX STI, BRZ, Legacy, Outback

More robust design for high-power engines

In WRX STI – reinforced version with DCCD (active differential)