A/T System Description - Electronic Control System
A/T System Description - Electronic Control System
Electronic Control System
Electronic Control
The electronic control system consists of the powertrain control module (PCM), sensors, switches, and solenoid valves.
Functional Diagram
The PCM receives input signals from sensors, switches, and other control units, processes data, and outputs signals for the engine control system and A/T control system. The A/T control system includes shift control, grade logic control, clutch pressure control, and lock-up control. The PCM switches the shift solenoid valves and the A/T clutch pressure control solenoid valves ON and OFF to control gear selection and the torque converter clutch lock-up.
Electronic Control System (cont'd)
Shift Control
The PCM instantly determines which gear should be selected by various inputs from sensors and switches, and it actuates shift solenoid valves A, B, C, and D to control gear selection.
There are two types of shift solenoid valves:
- Shift solenoid valves A and D use the ON-OPEN/OFF-CLOSE type; the shift solenoid valve opens the port of shift solenoid valve pressure while the shift solenoid valve is turned ON by the PCM, and closes the port when shift solenoid valve is OFF.
- Shift solenoid valves B and C use the ON-CLOSE/OFF-OPEN type; the shift solenoid valve closes the port of shift solenoid valve pressure while the shift solenoid valve is turned ON by the PCM, and opens the port when shift solenoid valve is OFF.
The combination of driving signals to shift solenoid valves A, B, C, and D are shown in the table.
Shift Control - Grade Logic Control
The grade logic control system has been included to improve shifting in D and D3. The PCM compares actual driving conditions with programmed driving conditions, based on the input from the accelerator pedal position sensor, the engine coolant temperature sensor, the barometric pressure sensor, the brake pedal position switch, and the transmission range switch, to improve shifting while the vehicle is ascending or descending a slope.
Electronic Control System (cont'd)
Grade Logic Control: Ascending Control
When the PCM determines that the vehicle is climbing a hill in D and D3, the PCM extends the engagement area of 2nd gear, 3rd gear, and 4th gear to prevent the transmission from frequently shifting between 2nd and 3rd gears, between 3rd and 4th gears, and between 4th and 5th gears, so the vehicle can run smoothly and have more power when needed.
Grade Logic Control: Descending Control
When the PCM determines that the vehicle is going down a hill in D and D3, the upshift speed from 4th to 5th gear, from 3rd to 4th gear, and from 2nd to 3rd gear (when the throttle is closed) becomes higher than the set speed for flat road driving to extend the 4th gear, 3rd gear, and 2nd gear driving conditions or modes. This, in combination with engine braking from the deceleration lock-up, achieves smooth driving when the vehicle is descending. There are three descending modes stored in the PCM with different 4th gear, 3rd gear, and 2nd gear driving conditions or modes based on the steepness of the grade. When the vehicle is in 5th or 4th gear and the vehicle is decelerating while applying the brakes on a steep hill, the transmission downshifts to a lower gear. When you accelerate, the transmission then returns to a higher gear.
Deceleration Control
When the vehicle goes around a corner and needs to decelerate first and then accelerate, the PCM goes into the deceleration control mode to reduce the number of times the transmission shifts. When the vehicle is decelerating from speeds above 25 mph (40 km/h), the PCM shifts the transmission from 4th to 3rd gear earlier than normal.
Shift-Hold Control
When negotiating winding roads, if the throttle is suddenly released and the brakes are applied, as is the case when decelerating at the entrance of a corner, shift-hold control keeps the transmission in its current (lower) gear as it negotiates the corner and accelerates out.
When the vehicle is driven aggressively on a winding road, the PCM extends the engagement time of 3rd gear and 4th gear to prevent the transmission from frequently shifting between 3rd, 4th, and 5th gears. This allows the driver to have more control for both acceleration and deceleration.
The PCM monitors the change in vehicle speed and throttle over time. When these values exceed those for normal driving conditions, the upshift from 3rd to 4th gear and 4th to 5th gear are delayed. This gives more control over power, and engine braking when the driver is driving aggressively around winding roads. The transmission resumes the normal upshift pattern after the PCM determines that normal driving has resumed.
Electronic Control System (cont'd)
Clutch Pressure Control
The PCM actuates A/T clutch pressure control solenoid valves A, B, and C to control the clutch pressure. When shifting between gears, the clutch pressure is regulated by A/T clutch pressure control solenoid valves A, B, and C engages and disengages the clutch smoothly.
The PCM receives input signals from the various sensors and switches, processes data, and outputs current to A/T clutch pressure control solenoid valves A, B, and C.
Lock-Up Control
Shift solenoid valve D controls hydraulic pressure to switch the lock-up shift valve ON and OFF. When the PCM actuates shift solenoid valve D and A/T clutch pressure control solenoid valve C ON, and lock-up starts. A/T clutch pressure control solenoid valve C applies and regulates hydraulic pressure to the lock-up control valve to control the amount of lock-up. The lock-up mechanism operates in D (2nd, 3rd, 4th, and 5th gears) and in D3 (2nd and 3rd gears), only on deceleration, and above 60 mph (97 km/h).
Electronic Control System (cont'd)
PCM A/T Control System Electrical Connections
PCM A/T Control System Inputs and Outputs at PCM Connector A (square) (49P)
Electronic Control System (cont'd)
PCM A/T Control System Inputs and Outputs at PCM Connector B (triangle) (49P)
PCM A/T Control System Inputs and Outputs at PCM connector C (circle) (49P)
Electronic Control System (cont'd)
PCM A/T Control System Inputs and Outputs at PCM connector C (circle) (49P)
