SEAT Leon and Toledo TDi 90 and 110 hp Diesel — Technical Data Sheet AUTO-VOLT N°779

Technical data sheet AUTO-VOLT N°779 (June 2001) covering the SEAT Leon (from October 1999) and Toledo (from April 1999) equipped with 1.9 TDi 90 and 110 hp diesel engines. Both models use the VAG platform shared with Golf IV, Bora, Audi A3, and Skoda Octavia. The 1,896 cc four-cylinder inline engine mounts transversely and tilts 30° rearward, with a cast iron block, aluminium head, and single overhead camshaft driven by toothed belt; engine codes are ALH/AGR (TDi 90) and AHF (TDi 110). Cooling system operates under pressure with forced circulation; thermostat begins opening at 85°C and reaches full opening at 105°C with a minimum stroke of 7 mm. Non-airconditioned models use a single bi-speed fan controlled via stepped thermocontact (100/60 W, 345 mm diameter), while air-conditioned versions feature two bi-speed fans managed by thermal control module (left fan 250/60 W 345 mm, right fan 220/60 W 290 mm). Thermostat engagement occurs at 92–97°C for first speed and 99–105°C for second speed, with corresponding cut-off points at 84–91°C and 91–98°C. Post-ventilation relay is ECU-controlled on AHF engines and all air-conditioned vehicles. Vehicle identification includes the 17-character VIN stamped on the bulkhead and engine type/number marked on the block front face at the gearbox joint. The workshop manual provides comprehensive injection system details, EGR management procedures, ABS with EBV and ESBS operation, complete wiring diagrams, and connector pinout reference for technicians and service professionals performing maintenance and repair work.