IDENTIFICATION
The E4OD automatic transmission is identified by a tag located on left side of case, to rear of Transmission Range (TR) sensor. Top line of tag shows assembly part number and serial number. Second line on tag shows model number. Last line of tag shows build date. (Scheme 14)
Scheme 14
DESCRIPTION
The E4OD is a fully automatic, electronically controlled, 4-speed automatic overdrive transmission. Transmission consists of torque converter clutch, 6 multiple-disc friction clutches, one band, 2 sprag one-way clutches, a roller one-way clutch and 3 planetary gearsets. (Scheme 15)
Shift control solenoids provide gear selection and are controlled by the EEC microprocessor. For additional information on the EEC system, refer to appropriate TESTS W/CODES article in ENGINE PERFORMANCE section.
The EEC 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.
