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1994 Toyota Celica AUTO TRANS DIAGNOSIS

September 16th, 2008 · No Comments

The A-140E automatic transmission is electronically controlled. Transmission shifting and torque converter lock-up are controlled by an Electronic Controlled Transmission (ECT) Electronic Control Unit (ECU). Control unit is referred to as the ECT ECU. NOTE: ECT ECU is combined with the engine ECU into one unit. This control unit is referred to as the engine and ECT ECU. See Figs. 1-3. In this article, control unit will be referred to as the ECT ECU on all models.

The ECT ECU receives information from various input devices and uses this information to control No. 1 and No. 2 solenoids for transmission shifting and lock-up solenoid for torque converter lock- up. A pattern select switch is located on center console (Camry).

See Figs. 1-3. Pattern select switch contains a POWER (depressed) and a NORMAL (released) operating position. When pattern select switch is depressed, transmission upshifts and downshifts will occur at a higher vehicle speed than with switch released. An indicator light will indicate the pattern select switch position.

An Overdrive (OD) switch is mounted on the shift lever. See Figs. 1-3. When OD switch is depressed to ON position, transmission will shift into 4th gear when shift lever is in “D” position, and OD OFF light on instrument panel will go off. When OD switch is released to OFF position, transmission will shift into 3rd gear, and OD OFF light on instrument panel will illuminate.

Transmission is equipped with a shift lock and key lock system. Shift lock system prevents shift lever from being moved from Park unless brake pedal is depressed. In case of a malfunction, shift lever can be released by depressing shift lock override button, located near shift lever. Key lock system prevents ignition key from being moved from ACC to LOCK position on ignition switch unless shift lever is in Park. For more information on shift lock and key lock system, see the SHIFT LOCK SYSTEM article.

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