Overhaul - A4LD: Description
The A4LD is a 4-speed automatic overdrive transmission with lock-up type torque converter. Transmission consists of torque converter, planetary gear train, 3 multiple disc clutch packs, 3 bands, 2 one-way clutches and a hydraulic control system. See Fig 1 .
Shift control solenoids control gear selection and are operated by the EEC-IV microprocessor. For additional information on the EEC-IV system, refer to TESTS W/CODES - EEC-IV article in the ENGINE PERFORMANCE section.
The EEC-IV system has self-diagnostic capabilities. Fault codes for faulty engine and transmission sensors, switches and circuits are stored in the PCM and may be retrieved to aid diagnosis and repair.