Camry Coupe 2-Door V6-3.0L (1MZ-FE) (1996)
Shift Indicator: Description and Operation
System Outline
Previous Automatic Transmissions have selected each gear shift using mechanically controlled throttle hydraulic pressure, governor hydraulic pressure,
and lock-up hydraulic pressure. The Electronic Controlled Transmission, however, electrically controls the line pressure, and lock-up pressure etc.,
through solenoid valves. The Engine Control Module (Engine and Electronic Controlled Transmission ECU) controls of the Solenoid Valves based on
the input signals from various sensors which makes smooth driving possible by shift selection for each gear which is the most appropriate to the driving
conditions at that time.
1. GEAR SHIFT OPERATION
During driving, the ECM selects the shift for each gear which is most appropriate to the driving conditions, based on input signals from the Engine
Coolant Temp. Sensor into TERMINAL THW of the ECM, and also the input signals to TERMINAL NC2+ of the ECM from the O/D Direct
Clutch speed sensor. Current is then output to the appropriate Shift Solenoids. When Shifting to 1st gear, current flows from TERMINAL S1 of
the ECM --> TERMINAL 3 of the Solenoid connector --> GROUND, and the No.1 Solenoid causes the shift.
For 2nd gear, the current flows from TERMINAL S1 of the ECM to TERMINAL 3 of the Solenoid connector --> GROUND, and from
TERMINAL S2 of the ECM to TERMINAL 6 of the Solenoid connector --> GROUND, and Solenoids No.1 and No.2 cause the shift.
For 3rd gear, power to Solenoid No.1 is cut, and power is available only to Solenoid No.2, causing the shift.
Shifting into the 4th gear (overdrive) occurs when there is no power to either Solenoid No.1 or No.2.
2. LOCK-UP OPERATION
When the ECM judges from each signal that lock-up operation conditions have been met, current flows from --> TERMINAL SL of the ECM to
Terminal 2 of the Solenoid connector (SL Solenoid) --> GROUND, causing Lock-Up operation.
3. STOP LIGHT SW CIRCUIT
If the brake pedal is depressed (stop light SW ON) when driving in lock-up condition, a signal is input into TERMINAL STP of the ECM, the
ECM operates and power to the Lock-Up Solenoid is cut.
4. OVERDRIVE CIRCUIT
* O/D Main SW ON
When the O/D Main SW is turned ON (O/D OFF Indicator Light turns OFF), a signal is input into TERMINAL OD2 of the ECM and the ECM
operation causes gear shift when the conditions for overdrive are met.
* O/D Main SW OFF
When the O/D Main SW is turned to OFF, the current through the O/D OFF indicator light flows through the O/D Main SW to GROUND,
causing the O/D OFF indicator light to light up. At the same time, a signal is input to TERMINAL OD2 of the ECM which prevents shift into
overdrive.
5. ELECTRONIC CONTROLLED TRANSMISSION PATTERN SELECT SW CIRCUIT
If the ECT pattern select SW is changed from "Normal" to "Power", the current through the Power Indicator flows to GROUND, current flows to
TERMINAL P of ECM, and shift up and shift down occurs at a higher vehicle speeds than when the SW is in "NORMAL" position.