TF-80SC (AF40-6), TF-81SC (AF21), AW6A-EL

The Aisin Warner TF-80SC and TF-81SC are 6-speed electronically controlled automatic transaxles developed for transverse-engine vehicles. The transmissions were adapted by numerous manufacturers under their own designations, including AF40-6 in GM/Opel/Vauxhall applications, AF21 in Ford applications and AW6A-EL in Mazda applications. Both use a conventional torque converter with electronically controlled lock-up, planetary gearing and an electro-hydraulic valve body controlling the transmission's clutch and brake elements. Sonnax technical documentation specifically groups the TF-80SC and TF-81SC with the AF40, AF21 and AW6A-EL applications.

Specification: 6-speed automatic • Aisin Warner TF-80SC / TF-81SC family • AF40-6 / AF21 / AW6A-EL manufacturer designations • Transverse installation • Front-wheel-drive and AWD applications • Torque converter with electronically controlled lock-up clutch • Planetary gearsets • Electronically controlled hydraulic valve body • Linear pressure-control solenoids • Adaptive shift control • Multiple clutch and brake elements • Multiple final-drive ratios and electronic calibrations depending on application.

Commonly fitted across selected Volvo, Vauxhall/Opel, Saab, Peugeot, Citroën, Ford, Mazda and Land Rover vehicles, with related versions also appearing in other European applications. The TF-80SC/AF40 is particularly associated with Volvo and GM/Opel applications, while the TF-81SC/AF21/AW6A-EL variants were used by Ford and Mazda. Despite their shared architecture, valve bodies, internal components, torque converters, software calibrations and drivetrain configurations can differ considerably, so the vehicle VIN, complete transmission identification and individual component or valve-body number should always be confirmed before ordering replacement parts.

Common Faults

Common TF-80SC/TF-81SC family problems include valve-body bore wear, clutch-control valve wear, pressure-regulator problems, solenoid-related hydraulic faults, torque-converter lock-up problems and clutch or B1 brake-band wear. Typical symptoms include delayed or harsh engagement, 1–2/2–3/3–4/4–5 or 5–6 flare, harsh coast-down shifts, slipping in higher gears, harsh reverse engagement, TCC slip and incorrect-ratio faults. Sonnax specifically documents B1 control-bore wear causing flare shifts, slipping, erratic clutch application, ratio codes and B1 band damage, while C2 control-circuit wear can cause 3–4 flare, 4th–6th gear slipping and C2 clutch failure.

Common Fault Codes

This Aisin transmission family was adapted by multiple manufacturers, the exact DTC numbering and descriptions can differ between Volvo, Ford, Mazda, Vauxhall/Opel, Saab, Peugeot/Citroën and Land Rover diagnostic systems. A manufacturer-specific code should therefore be checked against the vehicle make, model, model year and transmission variant before using it to identify a replacement valve body, solenoid, torque converter or internal component.