Control System Description

1. SHIFT CONTROL
The Transmission Gear is shifted according to the shift pattern selected by the driver. In shifting Gears, the Gear ratio is controlled by the "ON"/"OFF" signal using the shift solenoid A and the shift solenoid B.

2. BAND APPLY CONTROL
The band apply is controlled when in the 3-2 downshift (Engine overrun prevention) and the garage shift (shock control). The band apply Solenoid is controlled by the signal from the Pulse Width Modulation (PWM) to regulate the flow of the oil.

3. TORQUE CONVERTER CLUTCH CONTROL
The Clutch "ON"/"OFF" is controlled by moving the Converter Clutch Valve through shifting Torque Converter Clutch (TCC) Solenoid using the "ON"/"OFF" signal.

4. LINE PRESSURE CONTROL
The Throttle Signal allows the current signal to be sent to the Force Motor. After receiving the current signal, the Force Motor activates the Pressure Regulator Valve to regulate the line pressure.

5. ON-BOARD DIAGNOSTIC SYSTEM
Several malfunction displays can be stored in the Powertrain Control Module ([1][2]PCM) memory, and read out of it afterwards. The serial data lines, which are required for the testing of the final assembly and the coupling to other electronic modules, can be regulated by this function.

6. FAIL-SAFE MECHANISM
If there is a problem in the Transmission System, the [1][2]PCM will go into a "backup" mode. The Vehicle can still be driven, but the driver must use the Gear Lever to shift Gears.

7. TORQUE MANAGEMENT CONTROL
The transmisssion control side sends the absolute spark advance signal to the Engine control side while the Transmission is being shifted, to control the Engine spark timing in compliance with the Vehicle running condition to reduce the shocks caused by the change of speed.

8. ATF WARNING CONTROL
The Oil Temperature Sensor detects the Automatic Transmission Fluid (ATF) Oil temperature to control the oil temperature warning, TCC and the winter mode.