Diagnosis - Aw03-72LE (With OBD-II): Description

Automatic transmission is electronically controlled. Transmission shifting and torque converter lock-up are controlled by Transmission Control Module (TCM).

The TCM receives information from various input devices and uses this information to control shift solenoids No. 1 and 2 on transmission valve body for transmission shifting, and Torque Converter Clutch (TCC) solenoid for torque converter lock-up.

An Overdrive (OD) switch is mounted on shift lever. When OD switch is depressed to ON position with shift lever in "D" range, transmission will upshift into 4th gear and OD/OFF indicator on instrument panel will go off. When OD switch is released to OFF position, transmission will downshift into 3rd gear, and OD/OFF indicator will illuminate.