IDENTIFICATION
The E4OD automatic transmission is identified by a tag located on left side of manual lever position (MLP) sensor. Top line of tag shows assembly part number and serial number. Second line on tag shows model and build date. (Scheme 11)
Scheme 11
DESCRIPTION
The E4OD is a 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 hydraulic control system. (Scheme 12)
Shift control solenoids provide gear selection and are controlled by the EEC-IV microprocessor. For additional information on the EEC-IV system, refer to the appropriate TESTS W/CODES article in 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.
